Paleosalinity control on development of lacustrine shale: an example of shale from the lower submember of Member 3 of Paleogene Shahejie Formation,Dongying sag
HAI Qing1, LIANG Chao1,2, YANG Bo1, HAN Yu1, HAN Wanlu1
1 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580, China; 2 National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Shandong Qingdao 266580, China
Abstract：The development of lacustrine high-quality hydrocarbon source rocks is often associated with lake salinization,but the impact of salinization on shale development remains unclear. In this paper,taking the Paleocene shale of the Dongying sag as an example,we analyze the changes in shale composition,laminae structure,and organic matter abundance across different salinity evolution stages. This is done by means of thin-section observation,XRD,pyrolysis test of rocks,2D elemental scanning of XRF,and trace elemental test,combined with organic geochemistry data and variations in elemental content. The results show that the shale within the depth range of 3120-3160 m in the lower submember of Member 3 of the Shahejie Formation of Well F42 can be divided into five lithofacies. The environmental evolution of the target section can be divided into five stages,which are controlled by factors such as climate and terrestrial input. During the deposition of the lower submember of Member 3 of the Shahejie Formation,the paleoclimate transitioned from warm and humid to relatively wet and cold,then to warm and humid,relatively dry and cold,and finally to relatively warm and humid. Terrestrial input showed multi-period cyclic changes. Characteristics of sedimentary environments varied among different lithofacies. High-salinity lakes had high nutrient concentration,high primary productivity,strong water stratification,and weak water circulation. The position of oxycline/halocline was relatively high,and the oxygen-rich zone was shallow,facilitating the rapid deposition of organic matter into reducing environments,which favored organic matter preservation. The carbonate mineral content was high and developed as laminae in stagnant water layers.
HAI Qing,LIANG Chao,YANG Bo et al. Paleosalinity control on development of lacustrine shale: an example of shale from the lower submember of Member 3 of Paleogene Shahejie Formation,Dongying sag[J]. JOPC, 2024, 26(5): 1140-1151.
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