Discussion on mixing of fine-grained sediments in lacustrine deep water
Chen Shiyue1, Zhang Shun2, 3, Liu Huimin2, Yan Jihua1
1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580, Shandong; 2 Geological Scientific Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015, Shandong; 3 Postdoctoral Programme of Shengli Oilfield Company,SINOPEC,Dongying 257000, Shandong;
Abstract：The mixing of sediments is a common phenomenon in the nature. Fine-grained sedimentary rocks in deep lake are typical peperites. The authors take the example of fine-grained sedimentary rocks in the Lower Member 3 and Upper Member 4 of Shahejie Formation in Dongying Sag. Through core observation in cm-scale,detailed description of small-sized sedimentary structures,thin section identification,analysis of whole rock X-ray diffraction and trace elements test,fine-grained sediments occurrence and their mixed mode were studied,and the effect of basin fluid,climate and water properties on transfer,mixing and sedimentation of fine-grained rocks was analyzed. The mixing sedimentary mechanism of fine-grained rocks was discussed. The results indicate that fine-grained sedimentary rocks in lacustrine deepwater are mixed in both components and structures under macroscopic and microscopic scales. The mixing sedimentation can be classified into homogeneous,lamina-overlapped and heterogeneous mixings with lamina￣overlapped mixing the major type of fine-grained rocks. Based on the lamina contact relations,proportion and mineral occurence,the lamina mixing sedimentation is divided into: Lamina￣overlapped mixing of sand-mud and limestone,lamina￣overlapped mixing of mud and limestone,laminate mixing of mud-sand sequence and limestone,lamina￣overlapped mixing of limestone,mud and dolostone. The types of mixing sedimentation of fine-gained sediments are often influenced by multiple factors at the same time,and the climate and the hydrodynamic conditions are the main factors. The mixing sedimentation of fine-grained sediments varied in different fluids(turbidity current and bottom current). The climate causes changes of physical and chemical properties of water as well as layering of water body,which controls different types of flocculating settling and chemical deposition of fine-grained sediments. The mixing sedimentation types vary in different structural positions and water depths,and are even different vertically in the same structural position.
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