Implication of the large-tube settling experiment results on genesis of fine-grained deposition lamination of lacustrine basin
Li Sheng-Li, Li Shun-Li, Fu Chao
School of Energy Resources, Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,China University of Geosciences(Beijing),Beijing 100083,China
Abstract The study on sedimentary texture and structure is an important aspect in fine-grained sedimentology. At the same time,the genesis of laminar structure of organic mudstone or shale has always been a difficult problem. There are many factors affecting laminar structure of fine-grained deposits in a lacustrine basin,among which salinity and organic matter content are very important factors. Especially,oil shale can be developed in fresh or salt water environment. The relationship between the formation of laminar structure and water salinity needs to be further discussed. In this paper,through large-tube settling experiment,the depositional process and settlementation rate of clay minerals and organic rich argillaceous sediments in fresh water,brackish water and salt water were simulated and observed under hydrostatic conditions. Through experimental observation,the settlement process curve was drawn and the settlement rate was calculated. The research shows that the settlementation rate of organic rich mud in fresh water is significantly higher than that of clay minerals;in brackish water and saline water,the sedimentation rate of clay minerals is significantly higher than that of organic rich mud. At the same time,the sedimentation rates of the two types of fine-grained sediments in the three types of water environment also have different laws. By analyzing the experimental results,it is pointed out that the difference of flocculation type and the influence of buoyancy are the main reasons for the difference of fine particle deposition rate under different water medium conditions. Organic matter,clay minerals and water salinity jointly control the sedimentation rate of fine-grained sediments. Once these conditions change,it is easy to form similar or different laminae. In particular, when the abundance and salinity of organic matter change,it is easier to form laminae with different components. Therefore,in addition to the relatively quiet water environment,the formation of oil shale is also related to the abundance of organic matter,the content of clay minerals,the flocculation process and the comprehensive response to the change of water salinity,rather than the water salinity alone. In addition,in different areas of the lacustrine basin,fine-grained sedimentary structure types are different due to different depositional processes.
Fund:National Natural Science Foundation of China(No.42172112)
About author: Li Sheng-Li,born in 1971,is a professor in School of Energy and Resources,China University of Geosciences(Beijing). E-mail: slli@cugb.edu.cn.
Cite this article:
Li Sheng-Li,Li Shun-Li,Fu Chao. Implication of the large-tube settling experiment results on genesis of fine-grained deposition lamination of lacustrine basin[J]. JOPC, 2022, 24(3): 405-414.
Li Sheng-Li,Li Shun-Li,Fu Chao. Implication of the large-tube settling experiment results on genesis of fine-grained deposition lamination of lacustrine basin[J]. JOPC, 2022, 24(3): 405-414.
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