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The characteristics of carbonate minerals in the Longmaxi Formationgas shale and its impact on the reservoir performance in the Sichuan Basin

Guo Qi-heng1,Jin Zhen-kui1,Geng Yi-kai2,Zhao Jian-hua3,Chang Rui1,Cui Xue-min1,Wang Jin-yi1   

  1. 1.College of Geosciencess,China University of Petroleum,Beijing 102249,China;
    2.No.3 Oil Production Plant,PetroChina Daqing Oilfield Company,Daqing 163000,China;
    3.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China
  • Received:2018-10-15 Revised:2018-12-02 Online:2019-05-10

Abstract: In order to investigate the characteristics of carbonate minerals in gas shale and its effect on the reservoir performance,the Longmaxi Formation in the Sichuan Basin is selected for this study.Based on the analyses of X-ray diffraction,scanning electron microscope,porosity analyses of high-pressure mercury injection and nitrogen adsorption experiments,combined with data of thin sections and well logging,different types and some characteristics of carbonate minerals present in the Longmaxi Formation gas shale have been discussed and its influence on reservoir performance was revealed.Carbonate mineral types are mainly calcite,dolomite and ankerite.Six different types of microscopic occurrence have been identified,and pore types associated with carbonate minerals are mainly intragranular dissolution pores and inter-partical pores.TOC and carbonate mineral contents have positive correlation,which indicates high carbonate minerals content may favour the enrichment of organic matter in this gas shale.It's found that when the carbonate mineral content in the Longmaxi Formation is less than 10%,the carbonate mineral content has no correlation with shale porosity.When the carbonate mineral in the shale increases to higher than 10%,the shale porosity decreases with increasing carbonate mineral content.The pore volume and specific area of micropore and carbonate mineral content have negative correlations for both the mesopore and macropore,especially for the pore volume of the mesopores.In conclusion,the carbonate mineral particles act similarly to quartz particles supporting reservoir skeleton,however,the increase of carbonate mineral contents has an adverse effect on shale reservoirs by reducing its porosity.

Key words: Shale, Sichuan Basin, Carbonate minerals, Longmaxi Formation, Reservoir performance

CLC Number: 

  • TE122.2
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