Shale reservoir diagenesis and its impacts on pores of the Lower Silurian Longmaxi Formation in southeastern Chongqing
Zhao Difei1, 2, Guo Yinghai1, 2, Yang Yujuan1, 2, Wang Shouyu1, 2, Mao Xiaoxiao1, Li Mi1, 2
1 School of Resources and Earth Science,China University of Mining and Technology,Xuzhou 221116,Jiangsu; 2 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,the Ministry of Education,China University of Mining and Technology,Xuzhou 221008,Jiangsu
Abstract Taking shale samples of the Lower Silurian Longmaxi Formation from Qijiang,Nanchuan and Fuling Areas as an example,the mineral compositions,organic characteristics,pore characteristics and reservoir diagenesis were studied by XRD,mercury intrusion,field emission scanning electron microscopy,TOC test,RO test and low temperature nitrogen adsorption, etc. The results show that the reservoir diagenesis of the Lower Silurian Longmaxi Formation includes mechanical compaction,chemical compaction,dissolution,metasomatism,regmagenesis,mineral transformation,etc.; the diagenetic phase lies between late diagenesis and low-grade metamorphism; reservoir diagenesis show great impaction on porosity,permeability,formation mechanism,pore size distribution,heterogeneity and morphological characteristics. Mechanical/chemical compaction,dissolution,the evolution of organic matter and mineral transformation during the process had great influence on pores’ development and the reservoir diagenesis were divided into two types as constructive diagenesis(dissolution,etc.) and destructive diagenesis(compaction,etc.) by matching the process of reservoir diagenesis with the development of pores.
Fund:; [National Basic Research Program of China(973 Program,No.2012CB214702); The Scientific Research Foundation of Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education(China University of Mining and Technology)(No.2015-007); CUMT Innovation and Entrepreneurship Fund for Undergradates(No.201415.No.201517)]
Corresponding Authors:
Zhao Difei,born in 1991,is a Ph.D. candidate in China University of Mining and Technology. Now his research direction is about unconventional oil and gas geology. E-mail: diffidiffi@126.com.About the corresponding author Guo Yinghai,born in 1963. Now he is a professor of China University of Mining and Technology and mainly engaged in sedimentology and coal,oil and gas geology. E-mail: guoyh@cumt.edu.cn.
Cite this article:
Zhao Difei,Guo Yinghai,Yang Yujuan et al. Shale reservoir diagenesis and its impacts on pores of the Lower Silurian Longmaxi Formation in southeastern Chongqing[J]. JOPC, 2016, 18(5): 843-856.
Zhao Difei,Guo Yinghai,Yang Yujuan et al. Shale reservoir diagenesis and its impacts on pores of the Lower Silurian Longmaxi Formation in southeastern Chongqing[J]. JOPC, 2016, 18(5): 843-856.
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