岩性油气藏 ›› 2016, Vol. 28 ›› Issue (5): 18–25.doi: 10.3969/j.issn.1673-8926.2016.05.002

• 油气地质 • 上一篇    下一篇

四川盆地及其周缘五峰组—龙马溪组与筇竹寺组页岩含气性差异及成因

周 文1,2,徐 浩1,2,余 谦3,谢润诚1,2,邓 坤1,2   

  1. (1.油气藏地质及开发工程国家重点实验室(成都理工大学),成都 610059; 2.成都理工大学 能源学院,成都 610059; 3.中国地质调查局 成都地质调查中心,成都 610081)
  • 出版日期:2016-09-29 发布日期:2016-09-29

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

摘要:

四川盆地及其周缘五峰组—龙马溪组页岩和筇竹寺组页岩是同时期进行页岩气勘探开发的 2 套重点层位,五峰组—龙马溪组页岩气勘探取得了重大突破,而筇竹寺组页岩气勘探效果却不理想。利用四川盆地及其周缘野外露头资料、已钻页岩气井生产资料以及前人研究成果,总结了四川盆地及其周缘海相页岩的地质特征,并分析了五峰组—龙马溪组页岩与筇竹寺组页岩的含气性差异及其主要原因。研究认为,四川盆地及其周缘海相页岩最显著的特征为“高演化”和“强改造”,这与北美海相页岩差异明显。统计大量页岩气井生产情况发现,五峰组—龙马溪组页岩产气情况明显好于筇竹寺组页岩。筇竹寺组页岩压力系数较低,有机孔发育程度较差,相邻储层沥青分布广泛,这些都证实了桐湾期不整合面对筇竹寺组页岩含气性的破坏作用。震旦系顶桐湾期不整合面形成的排烃“通道”从生烃期开始的长期排烃,使层内残留烃量减少,是筇竹寺组页岩含气性较差的主要原因。

关键词: 页岩气, 页岩岩相, 五峰组, 龙马溪组, 川东地区

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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