渤海湾盆地沧东凹陷孔店组二段细粒沉积岩形成机理与环境演化

doi:10.11743/ogg20200414

Abstract

Abstract:

The development of unconventional oil and gas has triggered an upsurge of research in fine-grained sedimentary rocks.However, more research on the formation mechanism and depositional environment of lacustrine fine-grained sedimentary rocks is still needed.Through detailed description of core, thin section identification, X-ray diffraction analysis, automated mineral identification and characterization system (AMICS) and geochemical analysis, this paper establishes a classification scheme for lithofacies based on rock types and sedimentary structures.Fine-grained sedimentary rocks in the second member of the Kongdian Formation in the Cangdong Sag of Bohai Bay Basin was divided into five lithofacies: the laminated felsic fine-grained sedimentary rocks, massive mixed fine-grained sedimentary rocks, laminated mixed fine-grained sedimentary rocks, laminated dolomite and massive dolomite.The depositional environment and formation mechanism of each lithofacies type were analyzed.Four types of lithofacies assemblages were identified based on the superimposition patterns of different lithofacies.These assemblages vary in climate conditions, water body characteristics and terrigenous clastic input; and correspond to four depositional modes characterized respectively by intensive terrigenous sediment input, seasonal climate influence, semiarid seasonal influence, and prolonged arid.Analyses of the classification and geochemical indexes of the lithofacies assemblages show that the depositional environment in the second member of the Kongdian Formation can be divided into three stages from bottom to top: the seasonal climate stage from Ek²⁽⁴⁾ to Ek²⁽³⁾, the humid climate stage for Ek²⁽²⁾ and the arid-humid transitory stage for Ek²⁽¹⁾.

Key words: fine-grained sedimentary rock, lithofacies, formation mechanism, depositional environment, Cangdong Sag, Bohai Bay Basin

CLC Number:

TE122.2

Yuan Deng, Shiyue Chen, Xiugang Pu, Jihua Yan, Jia Chen. Formation mechanism and environmental evolution of fine-grained sedimentary rocks from the second member of Kongdian Formation in the Cangdong Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2020, 41(4): 811-823, 890.

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岩相大类	岩相类型	识别标志
细粒长英沉积岩相	层状细粒长英沉积岩相	灰色-灰白色,发育长英质层或条带
细粒混积岩相	块状细粒混积岩相	灰色,均匀块状,易于破碎,断面呈蛛网状
细粒混积岩相	纹层状细粒混积岩相	深灰色-灰黑色,纹层清晰、细密平直,纹层间发育层理缝
碳酸盐岩相	纹层状白云岩相	灰褐色-褐色,纹层发育,亮暗纹层相间
碳酸盐岩相	块状白云岩相	褐色,均匀块状或透镜状,常见成岩收缩缝

岩相类型	Rb/Sr	Sr/Ba	δU	TOC/%
层状细粒长英沉积岩相	0.21	0.60	0.87	2.08
块状细粒混积岩相	0.17	0.92	0.97	0.96
纹层状细粒混积岩相	0.14	1.01	1.15	5.29
纹层状白云岩相	0.06	1.62	1.33	2.21
块状白云岩相	0.04	1.83	1.11	1.27

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Formation mechanism and environmental evolution of fine-grained sedimentary rocks from the second member of Kongdian Formation in the Cangdong Sag, Bohai Bay Basin

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