Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: A case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China
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Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: A case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China |
| Bo LIU,Jiaxin SHI,Xiaofei FU,Yanfang LYU,Xianda SUN,Lei GONG,Yunfeng BAI |
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| Fig. 8. Laser confocal analysis of oil-bearing properties of typical lithology of the Qing-1 Member in the Gulong Sag (The short-wave fluorescence indicates light hydrocarbon, and long-wave fluorescence indicates heavy hydrocarbon). (a) Well H73, 2 320.7 m, high TOC massive mudstone facies, tight rock, with isolated pores in poor connectivity; (b) Well H73, 2320.7 m, high TOC massive mudstone facies, same view field with (a), the predominant long-wave fluorescence inside the pores indicates that the hydrocarbon is dominated by heavy components; (c) Well H51, 2 202.3 m, medium TOC layered mudstone facies, and the mineral grains vary significantly on both sides of the lamina; (d) Well H51, 2 202.3 m, medium TOC laminated mudstone facies, and same view field with (c), and the pore density with fluorescence varies greatly on both sides of lamina and is dominated by short-wave fluorescence; (e) Well H51, 2 192.1 m, low TOC layered sandstone facies, with well-developed intergranular pore in good connectivity; (f) Well H51, 2 192.1 m, low TOC layered sandstone facies, and same view field with (e), and the middle part of pores emit short-wave fluorescence, the edge of the pore emits long-short wave superimposed fluorescence; (g) Well H51, 2 341.1 m, low TOC layered limestone facies, with obvious shell structure and well-developed internal dissolution pores; (h) Well H51, 2 341.1 m, low TOC layered limestone facies, and the partially magnified view field of (g), and due to influence of shell, the pores with short wave light are arranged directionally, and the pores are uneven in connectivity. |
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