Ordovician lithofacies palaeogeography characteristics and their controlling effect on the reservoirs of buried hills in Yangshuiwu area,Jizhong Depression
JI Hancheng1,2, CHEN Liang1,2,3, SUN Yushu1,2, SHI Yanqing1,2, XIANG Pengfei1,2, YANG Zhibo1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing),Beijing 102249,China; 3 College of Science,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：In recent years,significant progress has been made in the exploration of oil and gas reserves in the buried hills of the Yangshuiwu area in the Jizhong Depression. However,the formation of reservoirs in inner buried hills is influenced by many complex factors,resulting in strong reservoir heterogeneity. Among these factors,lithofacies and palaeogeography obviously control the distribution of reservoirs in buried hills,which is helpful in guiding the exploration of oil and gas reserves. Based on studies of cores and thin sections,combined with drilling,logging,and oil and gas production data,it is believed that the Ordovician deposition in the Yangshuiwu area are tidal flat deposits,which consists of three sedimentary subfacies(subtidal zone,intertidal zone,and supratidal zone)and eight sedimentary microfacies. The frequent changes in sea levels caused the rapid variation in vertical sedimentary microfacies and it was characterized as an intertidal zone-subtidal zone. The dominant sedimentary microfacies in the plane direction are subtidal limestone flats,intertidal dolomitic limestone flats,limy dolomite flats,and limestone flats. The porosity of reservoirs in different sedimentary microfacies environments varied significantly. It is illustrated that some sedimentary microfacies,including the dolomite flat,limy dolomite flat,and dolomitic limestone flat in the intertidal zone-supratidal zone,control the distribution of favorable reservoirs.
JI Hancheng,CHEN Liang,SUN Yushu et al. Ordovician lithofacies palaeogeography characteristics and their controlling effect on the reservoirs of buried hills in Yangshuiwu area,Jizhong Depression[J]. JOPC, 2023, 25(5): 976-991.
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