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Variation in Pore Space and Structure of Organic-rich oilprone shales from a Non-marine Basin:Constraints from Organic Matter and Minerals

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1057-1069页

作者： JIA Jianliang LIU Zhaojun ZHOU Renjie LIU Rong GAO Yuan Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China College of Earth Sciences Jilin UniversityChangchun 130061China School of Earth and Environmental Sciences University of QueenslandBrisbane QLD 4072Australia Beijing Center for Physical and Chemical Analysis Beijing 100089China

Organic matter(OM)and minerals are major particle components of lacustrine *** influence of OM and minerals on pore space and structure in organic-rich oil-prone shales containing a large range of total organic carbon(TOC)contents is poorly *** this study,we investigated the variation in pore space and structure of low mature lacustrine shales in the Songliao Basin(NE China),based on a study of the mineralogy,petrography,geochemistry,and geophysical properties of *** pore types make markedly different contributions to the mineral surface area(MSA)and pore volume(PV)of the *** exists a negative correlation between MSA/PV and TOC in mesopores(r^(2)=0.75/0.65)and macropores(r^(2)=0.74/0.68),and a positive correlation in micropores(r^(2)=0.59/0.64),which are associated with the variation of mineral and TOC contents.A positive relationship between the throat/pore ratio and TOC(r^(2)=0.82)shows an increase in throat radius and decrease in pore radius with increasing TOC *** relationship is supported by the reduction in mean pore diameter(MPD)for large pores and increase in MPD for small *** variations are related to the decreased pores by quartz plus feldspar(Q+F)content,increased throats by clay minerals,an d enhanced pore-fill by *** propose that the variation of OM and minerals is a key control on the pore space and structure of low mature organic-rich oil-prone shales.

关键词： lacustrine basin oil-prone shale pore space pore structure OM-mineral association

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