Impact of pyrite on shale gas enrichment——a case study of the Lower Silurian Longmaxi Formation in southeast Sichuan Basin

Xin CHEN; Lei CHEN; Xiucheng TAN; Shu JIANG; Chao WANG

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Impact of pyrite on shale gas enrichment——a case study of the Lower Silurian Longmaxi Formation in southeast Sichuan Basin

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Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment.However,currently there are just a few studies on this subject matter.Therefore,the characteristics of pyrite in organic-rich shale section of the Longmaxi Formation and its impact on shale gas enrichment was studied in this paper by using outcrops,drilling cores,thin sections and test data.Result shows that pyrite occurred in different forms(macro-micro scale)in the Longmaxi Formation in the southeast Sichuan Basin.The formation and content of pyrite has a close relation with TOC content.Pyrite may catalyze the hydrocarbon generation of organic matter.Interparticle pores within the pyrite framboids and organic matter pores in the pyrite-organic matter complex are welldeveloped in the Longmaxi Shale,which serves as a major reservoir space for shale gas.Pyrite can promote shale gas enrichment by absorbing shale gas on its surface and preserving free gas in the interparticle pores and organic matter pores.In addition,as a kind of brittle mineral,pyrite can improve the brittleness of shale reservoir and increase the micro-nano pore system in shale reservoir,thereby improving the transmission performance of shale reservoir and boosting shale gas recovery.

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《地球科学前沿：英文版》 |2021年第2期|P.332-342|共11页
作者
Xin CHEN; Lei CHEN; Xiucheng TAN; Shu JIANG; Chao WANG;
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作者单位

Sichuan Key Laboratory of Natural Gas Geology Southwest Petroleum University Chengdu 610500 ChinaSchool of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China;

Sichuan Key Laboratory of Natural Gas Geology Southwest Petroleum University Chengdu 610500 ChinaSchool of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China;

Sichuan Key Laboratory of Natural Gas Geology Southwest Petroleum University Chengdu 610500 ChinaSchool of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China;

Energy&Geoscience Institute(EGI) University of Utah UT 84108 USA;

Exploration and Development Research Institute SINOPEC Jianghan Oiled Field Company Wuhan 430223 China;

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正文语种 chi
中图分类矿床学;
关键词
shale reservoir; pyrite; Longmaxi Formation; southeast Sichuan Basin;

Impact of pyrite on shale gas enrichment——a case study of the Lower Silurian Longmaxi Formation in southeast Sichuan Basin

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