Coupling relationship between reservoir diagenesis and gas accumulationin Xujiahe Formation of Yuanba-Tongnanba area,Sichuan Basin,China

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  • 1.School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;
    2.South Company of Prospecting,SINOPEC,Chengdu 610041,China;
    3.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China

Received date: 2015-12-14

  Revised date: 2016-02-17

  Online published: 2019-09-19

Abstract

The relationship between reservoir tighting time and gas charge period is the key issue which has not been well solved in studies on the tight sand gas accumulation mechanism and enrichment regularity.Based on the analysis of diagenetic evolution history,interaction sequence of organic-inorganic in aquiferous rock and gas charge history,the tighting mechanism of tight sandstone reservoir and the relationship between reservoir tighting time and gas accumulation period of Xujiahe Formation have been analyzed in Yuanba-Tongnanba area of Sichuan Basin.It has been confirmed that the main reason for the tight sandstone reservoir formation is the intensive mechanical compaction which dramatically reduce sandstone reservoir quality and resulted in semi-closed to closed diagenetic fluid system formation at early diagenetic stage.In the semi-closed to closed diagenetic fluid system,at the later diagenetic stage,the fluid circulation is not smooth,and the migration of dissolution products is blocked,so the dissolution products mainly undergo the in situ precipitation and cementation.Such dissolution products block the dissolution pores and residual primary pores,and the stronger the dissolution,the higher the cement content is,which makes the reservoir further tightened.The hydrocarbon generation,expulsion history of source rocks and reservoir fluid inclusion characteristics in Xujiahe Formation show that the charge of natural gas occurs in the Middle Jurassic-Early Cretaceous(mainly Early Cretaceous).Comprehensive analysis of reservoir tighting history,gas charge history and interaction sequence of organic-inorganic aquiferous in rock indicated that the sandstone reservoir was experiencing tighting process when gas charged in Xujiahe Formation in Yuanba-Tongnanba area of Sichuan Basin.

Cite this article

Li Jun, Hu Dong-feng, Zou Hua-yao, Li Ping-ping . Coupling relationship between reservoir diagenesis and gas accumulationin Xujiahe Formation of Yuanba-Tongnanba area,Sichuan Basin,China[J]. Natural Gas Geoscience, 2016 , 27(7) : 1164 -1178 . DOI: 10.11764/j.issn.1672-1926.2016.07.1164

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