Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 57-68.doi: 10.12108/yxyqc.20190107

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Analysis of accumulation conditions of three sets of marine shale gas in southern China

HE Guisong, HE Xipeng, GAO Yuqiao, ZHANG Peixian, WAN Jingya, HUANG Xiaozhen   

  1. Research Institute of Exploration and Development, East China Branch of Sinopec, Nanjing 210011, China
  • Received:2018-09-04 Revised:2018-11-03 Online:2019-01-18 Published:2019-01-18

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Abstract: In order to reveal the exploration potential differences of three sets of regional marine shale in southern China,the accumulation conditions were compared from the aspects of early transformation and post-reformation by using the data of core experiment analysis,drilling,fracturing test of typical wells in southern Guizhou, southeastern Chongqing and central Hunan area. The results show that:(1)Wufeng-Longmaxi Formation is siliceous shale in deep continental shelf of depression basin. It is the most favorable exploration and development layer with excellent potential for hydrocarbon generation,superior reservoir physical properties,high gas content and high formation pressure. High-quality shale thickness,preservation conditions and compressibility are the focus of the selection and evaluation of shale gas.(2)Jiumenchong Formation is interbedded silty-siliceous shale in deep continental shelf of the passive continental margin. It is an important successor layer for shale gas exploration with great potential for hydrocarbon generation,high thermal maturity,relatively poor physical properties,complicated storage conditions and deep burial depth. Thermal evolution degree,structural stability and burial depth are the focus of the selection and evaluation of shale gas.(3)Dalong Formation is interbedded mudstone-calcareous mudstone in deep water platform of rift basin. It is potential favorable layer with great potential for hydrocarbon generation,good physical properties,many interlayers,high clay mineral content,poorly capped roof and floor rocks,and low gas content. Favorable facies zones,continuous thickness of organic-rich shale and compressibility are the focus of the selection and evaluation of shale gas.(4)Wufeng-Longmaxi Formation in central,southern and southeastern Sichuan,Jiumenchong Formation in central Sichuan,southern Guizhou and Yichang areas,and Dalong Formation in Lianyuan area of central Hunan are favorable areas for shale gas exploration and development.

Key words: shale gas, preservation conditions, shale type, accumulation conditions, Wufeng-Longmaxi Formation, Jiumenchong Formation, Dalong Formation, southern China

CLC Number: 

  • TE122
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