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Analysis about the main controlling factors of tight gas accumulation and high output in Xujiahe Formation of Zhongtaishan area,Sichuan Basin

Tang Da-hai,Wang Xiao-juan,Chen Shuang-ling,Wu Chang-jiang,Yang Guang-guang,Wen Meng-han,Zhu Hua   

  1. 1.State Key Laboratory of Oil and Gas Geology and Exploitation,Southwest Petroleum University,Chengdu 610041,China; 2.Research Institute of Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China; 3.Technical Consulting Center of Southwest Oil and Gas Field company,Chengdu 610041,China
  • Received:2018-06-09 Revised:2018-09-19 Online:2018-11-10

Abstract: The Xujiahe Formation in Sichuan Basin has typical characteristics of tight sandstone gas.The exploration of the Xujiahe tight gas reservoir has obtained good achievements since 2006,which has found Anyue and Hechuan Gas Fields.The cumulative total amount of the Tertiary geological reserves is over one trillion cubic meters.But these fields have large water production after the development of gas reservoirs.Only a small number of wells have cumulative output of more than 50 million cubic meters.In 2012,the risk exploration Well ZT1 was drilled in Zhongtaishan area,the transitional zone of central-west Sichuan Basin,tested a large gas flow from Xujiahe Formation reservoir.Besides,the well has a high volume of gas production and a small amount of water-yielding,and has already produced more than a trillion cubic meters of natural gas so far.By means of analyzing the geological conditions of large production wells of typical gas reservoirs,the difference analysis of high yield factors between the Zhongtaishan area and other areas in central Sichuan is carried out.It is believed that the accumulation conditions and main controlling factors of gas reservoir in Zhongtaishan area are the high quality hydrocarbon source,channel sandstone reservoir and tectonic fractures.The high quality source rock provides sufficient gas source for the tight sandstone.Thehigh-quality channel sandstone reservoir forms the high-abundance gas reservoir and natural fracture is the key to high oil and gas yield.

Key words: Zhongtaishan area, Xujiahe Formation, Tight gas, High production, Main controlling factors of gas accumulation

CLC Number: 

  • TE122.1

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