Strategic Discovery and Theoretical Innovation of the Extra Large Gas Field of Longwangmiao Formation in the Middle Reaches of Chuanzhong

The Chuanzhong paleo-uplift in the Sichuan Basin is a large-scale paleo-uplift that was shaped by the Caledonian movement. The area of ​​the paleo-uplift is calculated to be more than 6x104km2 in the Silurian denudation zone. The main target layer is the Sinian system. The oil and gas exploration activities of the Paleo-uplift began in the 1950s and 1960s. In 1964, the oldest Sinian gas field in China was discovered in the Weiyuan structure. Although it persisted in exploration for more than 40 years, it has never been discovered. Since 2006, China National Petroleum Corporation (hereinafter referred to as "PetroChina" has strengthened research and risk exploration on the Moxiyi high-stone ladder area in the eastern Sichuan Middle Uplift. In July 2011, the Gaoshi 1 structure of Gaoshi 1 was cold. In the Longwangmiao Formation of the Wushu Department, the gas layer and the Sinian Dengying Formation were able to obtain a high-yield airflow of millions of cubic meters per day, and achieved major exploration breakthroughs. Since then, PetroChina has increased its principle of "holistic research, overall deployment, and overall exploration". For the exploration of the Moxi high stone ladder area, the Sinian-Cambrian natural gas enrichment block was discovered, and the reserves exceeded 1 trillion cubic meters.

Du Jinhu et al.: Strategic discovery and theoretical and technological innovation of the Longwangmiao Formation in the Chuanzhong Ancient Uplift. The study on the hydrocarbon accumulation conditions of the Chuzhongzhong uplift began in the 1970s. The Chuanzhong paleo-uplift was discovered using a small amount of drilling and seismic data.

In the 1980s and 1990s, several rounds of research were carried out, focusing on the tectonic evolution, oil and gas geological conditions and resource potential of the Paleo-uplift, and the development of the Karst reservoir of the Sinian Dengying Formation and the development of the Lower Cambrian Qiongzhusi Formation. Macroscopic geological understanding of hydrocarbon source rocks and paleo-uplifts to control oil and gas accumulation. In recent years, a lot of work has been done on the basic geology of the Sinian-Cambrian system, such as stratigraphic division and comparison, evaluation of Cambrian shale gas resources, and study on large-scale development conditions of carbonate reservoirs. The exploration of the ancient uplift played an important role. In 2011, the Neogene-Cambrian paleo-tectonics and lithofacies palaeogeography, the distribution of high-quality source rocks, the formation mechanism of large-scale reservoirs, the main controlling factors of the developmental strata, the formation of atmospheric zones, and the prediction of favorable areas were further developed. Research and proposed favorable exploration zones and drilling targets. At the same time, the engineering techniques for reservoir exploration, such as reservoir prediction, fluid identification, rapid drilling, and reservoir reconstruction, have been developed to form an advanced and practical technology series, effectively supporting the Chuanzhong paleo-uplift. Exploration in the atmospheric zone.

It must be pointed out that the Chuanzhong ancient uplift referred to in this article is not completely equivalent to the predecessor's "Leshan Longnv Temple Ancient Uplift", which only emphasizes the ancient uplift after the Caledonian movement. The author believes that the Chuanzhong paleo-uplift has a prototype in the Sinian period, mainly developed in the Moxi-high stone ladder area, which is characterized by the paleo-geomorphic highland that controls the development of algal hills, and the west side develops a rift trough.

This palaeogeographic pattern continued to evolve into the sedimentary period of the Early Cambrian Qiongzhusi Formation. In the late sedimentary period of the Early Cambrian Canglangpu Formation, affected by the regional compressional structure of the Caledonian cycle, a unified paleo-uplift was gradually formed. Therefore, it is necessary to name and highlight the "Chuanzhong paleo-uplift" from the perspective of the oil and gas geological conditions and main controlling factors of the Sinian-Civilization system in the exploration target layer. The strategic discovery of the large gas fields in the Chuanzhong paleo-uplift has created examples of scientific, rapid and efficient exploration in the history of oil and gas exploration in China and the world. In accordance with the "analysis of successful examples of oil and gas exploration", this paper introduces the exploration process of strategic discovery, the new progress of geological understanding of large gas fields and engineering technology innovation.

1 Strategic Discovery of Extra Large Gas Fields 1.1 Discovery History 1.1.1 Difficult Exploration Stage (1964-2005) Since the discovery of Weiyuan Gas Field in 1964 to the end of 2005, the Sichuan-Chongqing uplift (see) Sinian Cambrian exploration potential is directly geologic The family is optimistic and has continued to explore. A total of 21 exploration wells were drilled and 4 gas wells were obtained. The Ziyang gas-bearing structure was discovered. However, due to various factors such as geological understanding, data level, exploration technology and equipment capacity, it did not achieve a major breakthrough.

The previous continuous drilling and geological studies suggest that the Sinian Dengying Formation of the Gulong uplift has good conditions for hydrocarbon accumulation: the Lower Cambrian Qiongzhusi Formation developed the highest quality source rocks in the entire basin, and the broad-cover distribution; In the area of ​​the vast paleo-uplift in the western Sichuan, the Sinian Dengying Formation saw the dolomite-cavity reservoir, which is highly heterogeneous; from the Weiyuan gas field to the Longnvsi structure, the elevation difference is more than 2000m, spanning near In the vast area of ​​200km, the gas layer was seen to varying degrees, and the Ziyang ancient circle closed the airflow. The Gaoke 1 well, the Anping 1 well, and the female base well showed good oil and gas. Research and exploration practices have shown that large paleo-uplifts are generally gas-bearing and have good exploration potential.

1.1.2 Risk Exploration Stage (2006-2011) In 2006, the Sinian Cambrian in the Chuanzhong paleo-uplift was listed as a key risk exploration area for China's petroleum industry. The company organized a number of units to carry out systematic research and carry out seismic data processing and interpretation. , carried out multiple rounds of risk exploration target evaluation. Since 2007, it has successively deployed and implemented the risk exploration wells Moxi 1 Well, Baolong 1 Well and Hanshen 1 Well. The Well Moxi 1 was drilled ahead of time by the Changxing Formation of the Permian system; the Baolong 1 well was the main target layer of the Changxing Formation Taiji Reef, deepening the drill to the Lower Paleozoic, and the Cambrian Longwangmiao Formation reservoir owed In the development, the Xiayu Formation obtained low-yield airflow; the reservoir of the Dengying Formation in the Hanshen-1 well developed, and the water production was tested due to poor storage conditions. The new round of risk exploration has once again confirmed that the Sinian Dengying Formation and the Cambrian are generally gas-bearing, but the reservoir is highly heterogeneous. It is a breakthrough in the field to find a favorable reservoir development zone and a well-preserved inheritance structure. key.

In 2009, PetroChina carried out basic research work on the new-series Sinian Cambrian stratigraphic stratigraphic correlation, tectonic evolution analysis, sedimentary reservoir anatomy, and old well review, progressing to implement structural traps, and locking up high-stone ladders and grinding. The three exploration targets of Xixi and Luoguanshan are favorable targets. In particular, it is aimed at the bottleneck of the main purpose of the Gaoshi Tectuoxi structure, and organized a number of units to carry out the 2D seismic data of the Moxi structure (area 215 km2) and the 2D seismic data of the Gaoshi ladder structure (accumulated line length 1100km) Parallel processing explains the problem. Through this round of systematic research and research, it is generally believed that the oil exploration and development oil exploration area of ​​the Gaoshi Tiyixixi area in the eastern part of the paleo-uplift has a large burial depth and good preservation conditions; the Sinian Dengying Formation and the Cambrian Longwangmiao Formation The distribution area is large, the hydrocarbon detection is good, and the earthquake predicts the development of the reservoir (see).

Predicting the Longwangmiao Formation in Gaoxi Laiyixi Area In December 009, PetroChina organized the demonstration of the risk exploration wells in Wells Gaoxi 1 and Moxi 8 and Luojing 1 well, and decided to implement the Luojing 1 well first. The drill stone of Well 1 is drilled, and the well of Moxi 8 is selected according to the drilling situation of Shishi 1 well. The main target layer of the drilling of Luoguan 1 well is the Cambrian Longwangmiao Formation, but the sedimentary facies of the Longwangmiao Formation changed in the area, resulting in the reservoir not developing but not found in the industry, only tested in the Permian Maokou Formation. The gas production was 45xl04m3; the Gaoshi 1 well achieved high production gas flow in the Sinian Dengying Formation and achieved a major breakthrough.

The Gaoshi 1 well is located in the Gaoshi ladder structure, and the designed well depth 5 was drilled on August 20, 2010. On June 17, 2011, it was drilled to 5841m (the Sinian Doushantuo Formation). The completion of the well interpretation of the Dengying Formation 49565390m well gas layer 13 layer 150.4m, the differential gas layer 12 layer 41.9m, the Cambrian Longwangmiao group found gas layer (not tested oil); July 2011, Sinian lamp shadow group lights The second-stage perforation acidification test was carried out, and the natural gas produced was 102.14xl04m3, and the hydrogen sulfide content was 14.7g/m3. The high-yield gas flow was obtained in Gaoshi 1 well, which enabled the Chuanzhonggu uplift gas that has been continuously explored for half a century and can not be attacked for 47 years. A major breakthrough was made in exploration.

1.1.3 Overall Evaluation Stage (2011-present) After the major discovery of Gaoshi 1 well, PetroChina first determined the overall study, overall deployment and overall exploration of the large-scale paleo-uplift in central Sichuan based on the macroscopic understanding of the conditions for the accumulation of paleo-uplifts in the central Sichuan region. , implementation in batches, merit-seeking "the principle of work deployment."

Secondly, in response to the geological understanding problem and the key technical bottlenecks, a special exploration and production research project “Study on the hydrocarbon-bearing evaluation and exploration supporting technology of the Sinian system of the Longshan Temple in the Sichuan Basin” was established. In geological research, efforts are made to solve key geological problems such as main controlling factors, distribution and enrichment rules of oil and gas accumulation, favorable area evaluation and well location optimization, and to guide exploration and deployment; engineering technology, development of seismic reservoirs and fluid prediction Technical breakthroughs in four technical bottlenecks, such as complex lithologic logging interpretation, safe rapid drilling and completion, and reservoir reconstruction, provide technical support for efficient exploration.

Finally, timely grasp the drilling and research results, strengthen process science decision-making, and develop deployment plans to ensure exploration results. In August 2011, in April 2013, it focused on four times to study and deploy the exploration work in the Gaoshi Laiyi Moxi area. In August 2011, based on the macro-judgment of “looking large-scale gas fields in the eastern part of the large-scale paleo-uplift and having the potential to concentrate on accelerating the rhythm of work”, the first round of exploration and deployment plan was formulated: the overall deployment of 3D seismic 790km2 and exploration well 7. 2 In May 2012, based on the macro judgment of the "Gaoshi ladder Moxi structure Sinian Cambrian overall gas", the two-dimensional earthquake was deployed according to the principle of "based on the tectonic setting, multi-layered three-dimensional exploration, and overall control of gas-bearing scale". 900km, 650km2 for 3D seismic and 16 exploration wells. 3 In September 2012, Moxi 8 well obtained high-yield airflow in the Longwangmiao Formation of the Cambrian. Based on the understanding of "the thickness of the Longwangmiao Formation reservoir is large and the distribution is stable", in order to speed up the pace of the Moxi Longwangmiao Formation, five special exploration wells of the Longwangmiao Formation were deployed. 4 In April 2013, based on the basic understanding of the gas reservoir types and enrichment laws of the Longwangmiao Formation and the Dengying Formation (ie, the Cambrian Longwangmiao Formation gas reservoir has the characteristics of “puponic control, storage and control”, gas reservoirs The type is tectonic-lithologic; the fourth section of the Sinian Dengying Formation lamp "combined storage, control, and high-yield of the shoal and weathering karst", the gas reservoir type is a large lithologic stratigraphic composite gas reservoir), Established the overall goal of “the overall control area gas-bearing scale and speeding up the exploration of the Moxi Longwangmiao Formation gas reservoir” in 2013, and deployed a 3D seismic 1100km2 in the Longsisi area to the east of Moxi, in the Moxi-high stone ladder and its A total of 16 exploration wells were deployed in the periphery.

Through the four rounds of overall deployment, the exploration rhythm of the Sinian-Cambrian system in the Gaoshi ladder Moxi area was accelerated, and the high-efficiency exploration of the Longwangmiao Formation gas reservoir in the Moxi block was promoted. As of the end of December 2013, a total of 2 three-dimensional earthquakes were carried out in the Gaoshi Laiyi Moxi area, 27 wells were completed, 23 industrial gas wells were obtained, and the comprehensive success rate of exploration wells was 85%. The overall control of the Sinian gas-bearing area in the eastern part of the paleo-uplift was 7500 km2. The initial control of natural gas reserves is nearly 5OOOxlO8m3. 1.2 Exploration results of the Longwangmiao Formation large gas reservoirs in the Moxi area Up to now, three enriched blocks in the Moxi, Longnvsi and Gaoshi 6 wells have been discovered in the Gaoshi ladder Moxi structure. It is estimated that the scale of geological reserves will exceed 6,000×lO8m3. In 2013, the proven gas-bearing area of ​​the Longwangmiao Formation in the Moxi block is 779.86km2 (see), and the proven geological reserves of the Longwangmiao Formation in the Moxi area have the following characteristics: The Tibetan type is a lithologic gas reservoir on the tectonic setting. The Moxi structure is located at the high part of the gentle slope belt in the eastern part of the Sichuan Middle Paleozoic. The top structure of the Longwangmiao Formation is generally flat, and the axis is northeast and east. It is cut by the Moxi No. 1 fault and is divided into Du Jinhu and so on: the large gas field strategy of the Longwangmiao Formation in the Chuanzhong Ancient Uplift Discovered with theoretical technological innovations, Moxi traps and Moxi South traps. Among them, the Moxi trap area is 520.15 overall gas, which is lower than the lowest structural trap line, lOOrn. Containing gas area (see). The structure of the top boundary of the Longwangmiao Formation is the lowest trap line. The only water in the Wells of Moxi 203 and Moxi 204 is proven to be a single -4360m. The current exploration well confirms that the Moxi structure is at the bottom of the lithologic gas reservoir above -4 459m. Partial retention of water (see).

2 Developed layered pore dolomite reservoir with good reservoir conditions and high yield. The reservoir of the Longwangmiao Formation in Moxi is mainly developed in the upper middle part of the Longwangmiao Formation, with 35 reservoirs in the longitudinal direction, which are stacked on the plane and distributed stably. The thickness of the reservoir is 12.064.5m, with an average of 40.1m. The reservoir evaluation shows that the reservoir of Longwangmiao Formation is dominated by I+11 reservoirs, and the average thickness of type I reservoirs is 6.1m. The average thickness of the layer is 19.7m. The rock types of the reservoir are sand dolomite, residual sand dolomite and fine medium crystal dolomite; the reservoir space is mainly composed of intergranular dissolved pores and intercrystalline dissolved pores, and localized caves and seams are developed. . The average porosity of the full-diameter rock sample is 4.81%, of which the sample with porosity greater than 4.0% accounts for 62.2%. The average permeability is 4.75xl (T3pm2, wherein the permeability is greater than that of O.lxlO 3, which is 76.1%. The Longwangmiao Formation gas reservoir in the Xiqu block has been tested and 16 industrial gas wells have been tested, of which 11 wells are high-yield gas wells with a production capacity of one million cubic meters.

Petroleum Exploration and Development Oil and Gas Exploration 2 The main controlling factors for the formation of extra-large gas fields 2.1 Large-scale paleo-uplifting background The Chuanzhong paleo-uplift is a large-scale ancient uplift with inherited development. The sedimentary period of the Upper Sinian Dengying Formation has been established, mainly in the Moxi high stone ladder and Weiyuan area. It belongs to the high paleo-geomorphic part of the two sides of the rift trough, and is characterized by the development of high energy environment hilly facies. 2 Early Cambrian early control by regional extension activities, inherited development of rifting troughs (see), sedimentary thickness of the Maidiping Formation and Qiongzhusi Formation. 3 Early Cambrian Canglangpu passed the test of 8 wells and found that the trial production volume under different production systems is stable, the production oil pressure is stable, and it has good development prospects.

The content is 0.17% and 0.78%; the C02 content is 1.74% and 3.48%; the micro contains ethane, propane, hydrazine and nitrogen.

4 gas reservoir high temperature, high pressure. According to the measured temperature and pressure data, the pressure in the middle of the Longwangmiao Formation gas reservoir (altitude -4342.3m) in the Wells of Well 8 is basically the same, reaching about 76.0MPa, the pressure gradient is 0.271MPa/100m, the pressure coefficient is 1.653, and the gas reservoir is The central temperature is 141.4. The Moxi Longwangmiao Formation gas reservoir is a large-scale gas reservoir of scale, decoration and high efficiency. It has the characteristics of "two big, two high and three good": "two big" means large reserves, including The gas area is large; the "two highs" means that the gas wells have high output and the gas reservoir pressure is high; the "three good" means that the natural gas components are good, the exploration efficiency is good, and the test mining effect is good.

During the sedimentary period, the paleo-uplift features are more obvious, which is characterized by underwater paleo-uplifts. The core is located in the Longmen mountainous area west of Chengdu, and has obvious control effects on the distribution of the Canglangpu Formation and Longwangmiao Formation. 4 The Caledonian movement at the end of the Silurian period led to the formation of the paleo-uplift. The area of ​​the Silurian erosion was more than 6xl04km2.5. The Haixi-Yanshan early stage, the ancient uplift evolved and was deeply buried. 6 In the late Himalayan period of the Yanshan Mountains, due to the rapid uplift of the Weiyuan structure, strong tectonic deformation occurred in the western part of the Paleouplift, but the structural deformation in the eastern segment was weak.

Maidiping Formation + Qiongzhusi Formation + Canglangpu Formation 6 Early Cambrian rift trough distribution map (name U - Cambrian Longwangmiao Formation; Z2dn - Sinian Dengying Formation) Du Jinhu, etc.: Chuanzhong Ancient Uplift The strategic discovery and theoretical and technological innovation of the Longwangmiao Formation large-scale gas field (c) The formation and evolution of the Paleo-uplift of the Gaoshi 1(b) Maidiping Formation at the end of the sedimentary period of the Qiongzhusi Formation has obvious control over the composition of the Longwangmiao reservoir. The formation of the zone provides a good structural background. 1 In the early Early Cambrian period, the rift basin developed during the strong period, forming a sedimentary center of the Lower Cambrian high-quality source rocks (see). The Gaoshi 17 well reveals that the thickness of the source rocks of the Qiongzhusi Formation is 160m, and the thickness of the source rocks of the Maidiping Formation is up to 30m, which lays a rich source of hydrocarbon resources. 2 During the sedimentary period of the Longwangmiao Formation, the granitic shoal deposits were developed around the paleo-uplift, and the predicted distribution area was 8700 km. 2.3 The Longwangmiao Formation granulated beach dolomite experienced superimposed karst and superimposed transformation after the Caledonian movement, forming a large-area distribution. The pore-type high-quality reservoir lays the foundation for the formation of extra-large gas fields. 4 The inherited inheritance of the paleo-uplift greatly delays the timing of hydrocarbon generation and is conducive to the late accumulation and preservation of natural gas. Compared with the deep depression in the periphery, the hydrocarbon generation period of the Cambrian source rocks in the Gulongqi area is obviously late, the main oil generation period is Triassic, and the main gas generation period is Jurassic. The late tectonic movement only affects the western part of the paleo-uplift, and the eastern section of the paleo-uplift is structurally stable, which is conducive to the preservation of oil and gas reservoirs.

Zushi 7 Gaoshi i(d) Canglangpu Formation sedimentary period at the end of the Guguo EZ3â–¡â–¡ mouth dolomite algae beach shale mudstone sandstone fault rift trough Chuanzhong paleo-tectonic tectonic evolution profile (Z2dn-Sinian Dengying group; name imd - Cambrian Maidiping Formation; 4iq-Cambrian Qiongzhusi Formation; 4lC-Cambrian Canglangpu Formation) 2.2 Large-scale network hydrocarbon supply system Natural gas of the Longwangmiao Formation gas reservoir in the Moxi-Gaoshiti area From the Lower Cambrian, including the Qiongzhusi Formation and the Maidiping Formation. This set of source rocks has a wide-distribution distribution, but the high-value zone is in the rift zone (see). The gas source rock strength is mostly (20160)xl08m3/km2, and the neutron intensity of the rift trough area is as high as (100160)xl08m3/km2, which provides sufficient hydrocarbon source for the Dengying Formation and Longwangmiao Formation on the flank of the rift trough.

From the perspective of oil and gas migration and transport conditions, the networked transport system composed of unconformity surface and fault layer is widely developed in the paleo-uplift area, providing a good channel for large-scale oil and gas migration and accumulation. On the one hand, the Dengying Formation develops two sets of regional unconformity surfaces on the top surface of the lamp and the top surface of the four sections of the lamp, which is beneficial to the migration and accumulation of hydrocarbon sources along the unconformity side of the flank.

The characteristics of this accumulation and accumulation have been confirmed by the development of ancient oil reservoirs in the areas of Moxi Gaoshi Ladder and Weiyuan. On the other hand, the high-angle faults in the Moxi-Gaoshiji area are developed and dominated by tensile faults. The faults cut the source rock formation downwards, which is an effective channel for oil and gas migration in the Longwangmiao Formation (see). It can be seen that the networked transport system not only causes lateral migration of oil and gas along the unconformity surface, but also causes longitudinal migration of oil and gas along the fault, resulting in oil and gas enrichment of the multi-layered gas in the paleo-uplift zone. According to preliminary estimates, the resources of the Longwangmiao Formation in the Chuanzhong Ancient Uplift reached 1.16xl012m3, and the resources of the Dengying Formation reached (0.661.37) xlO12m3. The ancient uplift has abundant natural gas resources and huge exploration potential.

Paleo-reservoir gas reservoir dolomite limestone silty mudstone mudstone 1 Sichuan Middle-uplift Sinian-Cambrian gas reservoir evolution profile Oil exploration and development Oil and gas exploration is a tectonic gas reservoir, Gaoshi Tieyi Moxi area is a structure - Lithologic composite gas reservoir.

In short, the structural evolution of the paleo-uplift is well coupled with the history of hydrocarbon generation and drainage, with good preservation conditions and superior reservoir-forming conditions. Nowadays, gas reservoirs show a regular distribution: natural gas enrichment in the ancient and modern tectonic superimposed areas; lithologic gas reservoirs developed in the high elevations of the paleo-uplifts and the current slopes; tectonic gas in the late Paleozoic slopes and the late tectonic traps Tibetan.

From the evolution process of hydrocarbon accumulation, the widely distributed source rocks, large-area high-quality reservoirs and ancient and modern large-scale structural superimposed areas are the most favorable areas for atmospheric distribution. Taking into account the factors such as reservoir, source rock, structure and preservation conditions, it is considered that the Sinian-Cambrian system of the deep high-steep tectonic belt in the southeastern Sichuan Basin developed large structures and hydrocarbons near the Lower Cambrian source rocks. The center, the Dengying Formation karst reservoir and the Longwangmiao Formation granitoid reservoir are developed. Although the Himalayan tectonic deformation is strong, due to the development of the Cambrian gypsum strata, the Sinian-Cambrian transformation is not strong. Conducive to trap formation and oil and gas preservation, so oil and gas exploration potential is greater.

3 Key Techniques for Exploration of Extra Large Gas Fields in the Longwangmiao Formation of the Cambrian Department The Longwangmiao Formation in the Moxiyigaishi area is buried at 4,500,800 m, with high formation temperature and high pressure. Faced with complex formation conditions such as ultra-deep, high temperature and high pressure, the company actively carried out logging, seismic and engineering technology research and integration and application of ultra-deep high temperature and high pressure gas reservoirs, and formed a number of technological innovations to promote the exploration process of Longwangmiao Formation in an efficient and rapid manner. Provides important protection.

3.1 Seismic exploration technology is aimed at the deep burial of the stratum and the weak energy of the seismic reflection wave. The seismic data acquisition, processing and interpretation techniques are carried out, and the fine interpretation of ultra-deep low-amplitude structures and the description of fracture-cavity reservoirs are obtained. The following technological innovations: 1 The formation of ultra-deep low-amplitude carbonate rock "two wide and small" (wide azimuth, wide frequency, small face) digital seismic acquisition technology. High-precision 3D seismic acquisition is implemented using the "two widths and small" technology. The newly acquired seismic data band is 6125 Hz, and the target layer dominant frequency band is 1070 Hz. The seismic reflected wave waveform is active and the signal ratio is high. 2 Forming ultra-deep fidelity and amplitude-preserving seismic data processing and two-dimensional and three-dimensional continuous processing and interpretation techniques. Through the splicing static correction, multi-domain pre-stack combination, high-resolution imaging processing, etc., a series of ultra-deep carbonate rock seismic treatment technology with the preservation of fidelity as the core is formed. On this basis, the three-dimensional connection of the paleo-uplift is completed. The pre-stack time migration processing and fine structure interpretation of the slice and 2D seismic, the seismic structure is highly accurate, and the 35-well seismic prediction and verification, the absolute value of the error is 0.01%0.95%.3 The deep carbonate high resolution Rate seismic reservoir quantitative prediction technology. The seismic response mode of deep dolomite reservoirs is established by two-dimensional model forward modeling combined with well seismic fine calibration. The petrophysical experiments are used to clarify the seismic seismic elastic parameters of reservoirs. The pre-stack post-stack wave impedance inversion and elastic parameter inversion techniques are used to predict reservoirs from reservoir thickness, porosity and gas content. The overall prediction rate of layer prediction 3.2 Logging evaluation technology innovation developed the fine interpretation technology of carbonate fracture-cavity reservoir, and the reservoir interpretation rate was greatly improved. The technical innovation is mainly reflected in the following aspects: in the field of logging data collection, different logging technologies are used for reservoir characteristics, and the logging project is optimized. For the Longwangmiao Formation pore reservoir, nuclear magnetic resonance logging and MDT are used. Modular formation dynamic tester) logging; for crack-karst reservoirs, acoustic scanning and imaging logging; for complex lithology identification, mining (element capture spectrum) logging, ADT (dielectric scanning) ) New technology tests such as logging. A new series of logging evaluation technologies, including lithologic facies identification technology, parameter calibration and evaluation techniques for heterogeneous carbonate reservoirs, crack/karst identification and evaluation techniques, and complex carbonate reservoir pores have been formed. Structural evaluation and capacity prediction techniques. Through logging evaluation technology innovation, the coincidence rate of logging interpretation is effectively improved. In 2013, the coincidence rate of logging interpretation of Longwangmiao Formation of new drilling was 100%. The results of logging interpretation and production prediction predicted the oil selection layer.

3.3 Drilling technology For the characteristics of super-foam layer, multi-pressure system, local sulfur content, local ground temperature, etc., drilling technology research has been carried out, and a "excellent and fast" drilling technology model has been formed, which has realized the "speeding up" of drilling in the Gaoshi Tiyixi area. Improve efficiency" (see 2). Through the high-efficiency personalized drill bit test, the drilling speed-up mode based on "optimized well structure + high-efficiency PDC bit + long-life screw + high-quality drilling fluid" was initially formed, which reduced downhole pollution, inhibited collapse, and effectively reduced accidents. Rate, drilling speed is greatly improved.

In 2013, 13 wells of the Longwangmiao Formation were drilled, and the average drilling rate was 3.4m/h; the average drilling cycle was 97.32d (excluding coring). The completion cycle of the Moxi 101 well was 69.46d, which created the lowest record of the deep drilling cycle of the exploration well in the Longwangmiao Formation.

2 Comparison of drilling speed and drilling cycle of ultra-deep wells in Gaoxi Laiyixi area. 4 Reservoir reformation technology has formed deep penetrating acid pressure, stratified acid pressure, and steering for the Longwangmiao Formation gas reservoir with large thickness, vertical heterogeneity, high ground temperature, high pressure and deep burial. Acid pressure composite modification technology. Developed 180 °C high temperature gelling acid, turning acid, low-injury auto-acid and other acid liquid systems, reducing Du Jinhu, etc.: Chuanzhong Gulongqi Longwangmiao Group large-scale gas field strategic discovery and theoretical and technological innovation to solve fiber, degradation temporary blocking ball and supporting The 180°C layered and reformed packer tool and the test oil plugged integrated completion string. Through field application, the reservoir reforming efficiency is 80%, and the average test period of the layer test oil is only 12d. From the double logarithmic comparison chart of pressure recovery before and after acidification, it can be seen that the double logarithmic pressure curve and pressure derivative before acidification The opening between the curves is larger, indicating that the reservoir pollution in the near-well zone is more serious; the opening between the two curves on the double logarithmic curve after acidification is significantly reduced, and the acidification measures play an effective role in deblocking ( See 3).

After the acidification, the pressure derivative before the acidification is pressured, the pressure derivative is acidified, and the pressure derivative is wide. The time of the shut-down pressure recovery before and after the acidification of the lower section of the Longwangmiao Formation in the Well 8 of the Well 8 is compared with the supporting application of the reservoir reconstruction technology series. The actual production problems such as effective pressure reduction of the reservoir, pollution and blockage of the drilling and completion fluids, uniform acid distribution in the longitudinal direction, optimization of acid strength, reduction of acid scale, improvement of gas reservoir development quality and efficiency, exploration wells Procurement provides an effective guarantee.

4 Conclusion Since the successful exploration of Gaoshi 1 well in 2011, through the overall research, overall deployment, and overall exploration, the second section of the Sinian Dengying Group Light and the fourth section of the lamp, the Cambrian Longwangmiao Group have been discovered in more than two years. Three sets of industrial gas layers have been used to efficiently identify the large gas fields of the Moxi Longwangmiao Formation, and the overall control of the Sinian gas range in the eastern part of the paleo-uplift. It is found that the three Cambrian Longwangmiao Formations in Moxi, Longnvsi and Gaoshi Ladder contain gas. The district shows the exploration potential of the trillion-cent cubic meter atmospheric zone in the Chuanzhong paleo-uplift. Based on the anatomical study of the Sinian-Cambrian super-large gas field in the Chuanzhong paleo-uplift, the progress of the reservoir formation conditions and natural gas enrichment of the two main strata is clearly defined, and the deep layers of the high-steep structure in the southern part of the eastern Sichuan The Sinian-Cambrian system has good exploration potential and is a key area for future natural gas exploration, which should be highly valued.

Froth pumps are the latest generation of foam pump/froth pump based on the advanced technology at home and abroad, including Foam Tank Froth Slurry Pump, High Pressure Slurry Pump. It could eliminate the foam/froth in the slurry in running and work normally even if the feeding slurry is not enough. Froth pump is the ideal products to deliver the frothy slurry, especially in the flotation technique process.

Features of Foam/Froth Pumps                  
1. On the bearing house, there is the motor base or motor support, which helps adopt belt drive or direct drive. It is very convenient to change the pulleys to adjust the speed and meet the changes of the work conditions.
 
2.The box is made of steel, stainless steel or rubber lined steel. It has the feeding suction and overflow box in the tangent line. The overflow box could deliver the surplus slurry back to the pool. The feeding suction in the tangent line could transport the slurry fast and eliminate part of the froth.
 
3. Froth pumps are of double-casing. The materials of the wet parts could be metal alloy, rubber or other non-metal material according to the slurry properties.
 
Application of Froth Pumps
It is used widely in the metallurgy, minerals, coal washery, chemical and other industrial departments, suitable for handing the abrasive and corrosive slurry with the froth.

Froth Slurry Pump

Slurry Froth Pump,Froth Foam Pump,Centrifugal Froth Pump,Foam Tank Froth Slurry Pump, High Pressure Slurry Pump

Shijiazhuang Boda Industrial Pump Co., Ltd. , https://www.mineralslurrypump.com