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Composition and origin of clay minerals in the Lower Silurian Longmaxi Formation in eastern Sichuan Basin

Geng Yi-kai1,Jin Zhen-kui1,Zhao Jian-hua1,Wen Xin1,Chen Jun-nian1,Du Wei2   

  1. 1.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing 100083,China
  • Received:2016-01-27 Revised:2016-03-18 Online:2016-10-10 Published:2016-10-10

Abstract: In order to investigate the characteristics of clay minerals in shale gas reservoir and its relationship with organic matter,shale from Lower Silurian Longmaxi Formation in eastern Sichuan Basin was studied.Based on X-diffraction analysis and observation of SEM,combined with data of thin sections,core and logging,distribution characteristics and controlling factors of clay minerals and their influence on organic matter were revealed.Chlorite+illite/smectite+illite is the main assemblage,including neoformed,inherited and transformed types.There is abnormal high pressure in the lower segment of Longmaxi Formation in Jiaoshiba area,which inhibits lithificaiton.It has a non-normal transformation sequence that illite/smectite content increase with increasing depth in vertical direction.This non-normal transformation sequence can indicate the existence of abnormal high pressure.Detrital composition especially potash feldspar affect the content of clay minerals indirectly,whether it can provide enough K+ during illitization decides the equivalent transformation between illite mixed layer and illite.

Key words: Distribution, Abnormal high pressure, Clay mineral, Longmaxi Formation, Eastern Sichuan Basin

CLC Number: 

  • TE122

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