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Characteristics of shale gas reservoirs in wufeng formation and longmaxi formation in Well WX2,northeast Chongqing

Petroleum Research 2017年第4期2卷 324-335页

作者： Jin Wu Feng Liang Wen Lin Hongyan Wang Wenhua Bai Chao Ma Shasha Sun Qun Zhao Xiaojiang Song Rongze Yu PetroChina Research Institute of Petroleum Exploration and Development Langfang 065007China National Energy Shale Gas R&D(Experiment)Centre Hebei 065007China PetroChina Unconventional Oil&Ges Key Laboratory Hebei 065007China

To further understand shale reservoir characteristics of wufeng formation and longmaxi formation in the Wuxi area,northeast Chongqing,based on drilling data of Well WX2,and taking the graptolite biostratigraphy as the standard marker of stratigraphic division and comparison,the geochemistry,petrology,reservoir space and properties of organic-rich black shale were well investigated,and its gasbearing capacity and controlling factors were also *** result shows that in the wufeng formation and longmaxi formation of Well WX2,the organic-rich shale is 89.8 m thick and is characterized by good kerogen type,high organic abundance,moderate maturity and favorable hydrocarbongeneration condition,and the graptolite sequence is developed completely and continuously;the organic abundance is influenced by depositional rate,and the slow depositional rate is favorable for accumulation of organic matter in the black graptolite shale;from top to bottom,content of siliceous minerals increases and content of clay minerals decrease,therefore the brittleness increases;the organicrich siliceous shale and clay siliceous shale are favorable lithofacies for development of shale reservoirs;the nanopore is dominated by the parallel-plate pore with four open sides and has good connectivity;the pore size distribution curve has the multimodal characteristic,and the pore diameter mainly is in the range of 0.42e0.62 nm and the range of 3e5 nm;organic pores and interlayer pores of clay minerals make the greatest contribution to the total pore volume,while pores of brittle minerals have the least contribution;from top to bottom,organic pores gradually increase while interlayer pores of clay minerals gradually decrease;the on-site core gas content exceeds 8 m3/t,and the gas-bearing capacity is jointly controlled by hydrocarbon generation,reservoir and preservation conditions;and the WF2-LM6 biozone of the Katian to the early Aeronian is the high-quality shale reservoir,where the LM1 biozone o

关键词： Shale gas reservoirs Graptolite biozone Micropore Gas-bearing capacity wufeng formation and longmaxi formation Northeast Chongqing

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Dispositional characteristics of Ordovician wufeng formation and Silurian longmaxi formation in Sichuan Basin and its adjacent areas

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Petroleum Research 2017年第3期2卷 233-246页

作者： Haikuan Nie Zhijun Jin Xin Ma Zhongbao Liu Tuo Lin Zhenheng Yang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083China Sinopec Key Laboratory of Shale Oil/Gas Exploration&Production Beijing 100083China School of Energy Resource China University of GeosciencesBeijing 100083China Oil&Gas Survey Center China Geological SurveyBeijing 100029China

According to data of gas wells and typical sections of wufeng formation and longmaxi formation in Sichuan Basin,shale of various graptolite zones were analyzed to determine depositional environment,lithology and thickness characteristics of the graptolite shale interval of WF2-WF3 in the lower part of wufeng formation,the graptolite shale interval of WF4 in Guanyinqiao Member of wufeng formation and the graptolite shale interval of LM1-LM4 in the bottom of longmaxi formation,and characteristics of shale horizontal distribution were also *** the depositional period of the graptolite shale interval of WF2-WF3,the study area was less affected by the Guangxi movement,the depositional environment was the deep water of open sea,where black shale was mainly deposited;the sedimentation center was developed in northeast Guizhou-northeast Sichuan and south Sichuan,the maximum thickness was from 4 to 6 m in the sedimentation *** the depositional period of the graptolite shale interval of WF4,the depositional environment in the study area changed greatly due to global sea level fall and enhanced Guangxi movement;the central Sichuan paleouplift,the central Guizhou paleouplift and the Jiangnan-Xuefeng palaeouplift were further expanded,and the area of the sedimentary basin decreased;the depositional environment was mainly carbonate bioclastic shoal of shallow sea,and partially deep sea which only was distributed in the Shizhu-Fuling-Wuxi area in east and northeast Sichuan and the Gongxian-Yongchuan area in south Sichuan;sediments of shallow water were dominated by limestone and argillaceous limestone with abundant Hirnantia,sediments of deep water were dominated by calcareous mudstone and shale with *** the depositional period of the graptolite shale interval of LM1-LM4,due to rise of global sea level and Guangxi movement,the sedimentary area was larger than that in the depositional period of Guanyinqiao Member,and the sedimentary environmen

关键词： Shale Graptolite zone Depositional environment Palaeouplift wufeng formation and longmaxi formation Sichuan Basin

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