Reservoir characteristics and distribution of lacustrine fine-grained sedimentary rocks:a case study from Zhanhua sag,Bohai Bay Basin,China
LIN Xingyue1,2, ZHU Xiaomin1,2, WANG Xiaolin1,2, ZHANG Meizhou1,2
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249, China
Abstract：In order to deepen the understanding of lacustrine fine-grained sedimentary rock reservoirs,this paper takes the Lower Sub-member of Third Member of Shahejie Formation(Es3L)of Bonan subsag in Zhanhua sag,Jiyang depression,Bohai Bay Basin as the research object,and uses core description,thin section identification,scanning electron microscope observation,physical property analysis and logging curve to reveal the reservoir characteristics,main controlling factors and distribution patterns. Based on mineral composition,sedimentary structure and organic matter content,fine-grained sedimentary rocks in Es3L are divided into six lithofacies: organic-rich laminated gray fine-grained mixed rock(LF1),organic-rich laminated felsic fine-grained carbonate rock(LF2),organic-rich layered gray fine-grained mixed rock(LF3),organic-rich layered/massive felsic fine-grained carbonate rock(LF4),organic-rich layered felsic fine-grained carbonate rock(LF5),organic-rich massive felsic fine-grained carbonate rock(LF6). The main reservoir spaces of the reservoir are intergranular pores,intergranular pores,dissolution pores,and interlayer micro-fractures. The reservoir porosity mainly ranges from 0.67% to 5.56%,with an average of 4.93%. The permeability mainly ranges from 0.02×10-3 μm2 to 4.87×10-3 μm2(average of 0.59×10-3 μm2). The dominant control factors for the distribution of the Es3L fine-grained reservoir development include lithofacies,sedimentary environment,diagenesis and thermal evolution of organic matter. In the middle and lower part of the Lower Sub-member of Third Member of Shahejie Formation,the amount of terrestrial input is low,the water salinity is high,and the water stratification is strong. The main lithofacies area LF2 and LF4,which are prone to the development of Class I and Class II high-quality reservoirs. The fine-grained reservoirs in Es3L are in the intermediate diagenetic stage A. The transformation of clay minerals,dissolution,recrystallization and dolomitization,as well as the thermal evolution of organic matter produce secondary pores and fractures,which improve the physical properties of the reservoir.
LIN Xingyue,ZHU Xiaomin,WANG Xiaolin et al. Reservoir characteristics and distribution of lacustrine fine-grained sedimentary rocks:a case study from Zhanhua sag,Bohai Bay Basin,China[J]. JOPC, 2025, 27(1): 55-71.
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