Main controlling factors and distribution characteristics of shale lithofacies in the Eocene of Jiyang Depression
LIU Huimin1, WANG Yong2, LI Junliang2, ZHANG Pengfei2, ZHANG Shun2, WEI Xiaoliang2, QIN Feng2
1 Sinopec Shengli Oilfield Company,Shandong Dongying 257001,Chin; 2 Exploration and Development Institute of Shengli Oilfield Company,Sinopec, Shandong Dongying 257015,China
Abstract：In recent years,over 10 100 meters of cores have been collected to the study of the shale oil and gas system in the Jiyang Depression. These cores provide excellent materials for investigating the main control factors and distribution of shale lithofacies in continental rifted basins. In this study,diverse shale lithofacies in the upper Member 4(Es4S)and lower Member 3(Es3X)of Eocene Shahejie Formation in the Jiyang Depression are identified by utilizing thin section,XRD mineral composition and major element data. The experiment results show the primary development of four types of shale lithofacies in the Jiyang Depression,namely carbonate shale facies,mixed shale facies,clay shale facies,and felsic shale facies. Moreover,these lithofacies are further subdivided into nine subtypes: organic-rich laminated carbonate shale facies,organic-rich layered carbonate shale facies,organic-rich laminated carbonate mixed shale facies,organic-rich laminated clay mixed shale facies,organic-rich layered felsic mixed shale facies,organic-rich laminated clay shale facies,organic-rich layered clay shale facies,organic-rich laminated felsic shale facies and organic-bearing layered felsic shale facies. The Jiyang Depression,located in a northern latitude Asian monsoon climate zone,experienced intense rifting and was underfilled by sediments during the Paleogene. The lacustrine palaeowater medium(palaeo-water depth,palaeo-salinity,and palaeo oxidation-reduction)and palaeo-provenance variations have jointly controlled the types and distribution characteristics of lithofacies. Among these factors,palaeoclimate and basin evolution controlled the large-scale development of organic-rich carbonate laminated shale lithofacies,while the types of shale lithofacies were controlled by the interplay between palaeo-water body and palaeo-provenance. Additionally,the distribution of shale lithofacies was determined by the interaction of palaeogeomorphology and palaeo-provenance. This study has established a belt distribution model of shale in the Es4S and Es3X of the Jiyang depression,which can provide valuable insights for shale oil and gas exploration in continental rifted basins and contributes to the understanding of shale genesis research under similar geological conditions.
LIU Huimin,WANG Yong,LI Junliang et al. Main controlling factors and distribution characteristics of shale lithofacies in the Eocene of Jiyang Depression[J]. JOPC, 2023, 25(4): 752-767.
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