Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 18-25.doi: 10.3969/j.issn.1673-8926.2016.05.002

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Shale gas-bearing property differences and their genesis between Wufeng-Longmaxi Formation and Qiongzhusi Formation in Sichuan Basin and surrounding areas

Zhou Wen 1,2, Xu Hao 1,2, Yu Qian 3, Xie Runcheng 1,2, Deng Kun 1,2   

  1. (1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;3. Chengdu Center of Geological Survey, China Geological Survey, Chengdu 610081, China)
  • Online:2016-09-29 Published:2016-09-29

Abstract:

Wufeng?Longmaxi Formation and Qiongzhusi Formation are explored and developed for shale gas simultaneously in Sichuan Basin and surrounding areas. Great successes have been achieved at Wufeng?Longmaxi Formation, but it is unsatisfactory in Qiongzhusi Formation. Based on the data of outcrop, production and former findings, the geologic features of marine shale were summarized in Sichuan Basin and surrounding areas, and the gas?bearing  property differences and their genesis between Wufeng?Longmaxi Formation and Qiongzhusi Formation were analyzed. It is considered that the marine shale experienced the most significant characteristic of high thermal maturity and strong reformation in Sichuan Basin and surrounding areas, which differs greatly with marine shale in North America. The statistical data from a large number of production wells indicates that the shale gas output in Wufeng?Longmaxi Formation is better than that in Qiongzhusi Formation obviously. The shale in Qiongzhusi Formation is characterized by lower pressure coefficient, poorly developed organic pores and widely distributed asphalt at adjacent reservoir, which indicates that the unconformity surface at Tongwan stage destructed the shale gas?bearing property in Qiongzhusi Formation. It is considered that the hydrocarbon expelled along the Sinian top Tongwan unconformity surface since hydrocarbon generation and the residual shale gas is poor in Qiongzhusi Formation.

Key words: shale gas, shale lithofacies, Wufeng-Longmaxi Formation, eastern Sichuan Basin

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