鄂尔多斯盆地延长组长7段页岩油形成富集机理

doi:10.11743/ogg20200406

Abstract

Abstract:

Shale oil is a kind of important unconventional hydrocarbon resource in urgent need of exploitation.A systematic analysis of the forming conditions and accumulation mechanisms of shale oil in the 7th member of the Yanchang Formation (Chang 7 member) in Ordos Basin was carried out by using petro-chemistry and source rock geochemistry methods.The results show that the oil shale deposited in the member is extremely rich in organic matter with an average residual organic carbon abundance of 7.4%, and contains well-developed micro- and nano-pores for shale oil accumulation.Three main mechanisms of shale oil accumulation in the member are brought forward in this study:(1) both high organic matter productivity and strong reducing water environment served to effectively preserve organic matters in the super eutrophic lake basin during deposition, and organic shale of high abundance developed thereby provided the material basis for shale oil generation; (2) organic-rich shale characterized by strong oil-generating capacity, high conversion efficiency, and high intensity of oil expulsion in the member provided favorable conditions for the generation of shale oil in large scale; and (3) the dual occurrence mode of shale oil, i.e., organic matter adsorption and pore retention, provided various ways for the enrichment of shale oil in the member.

Key words: organic-rich shale, accumulation mechanism, shale oil, Change 7 member, Ordos Basin

CLC Number:

TE122.1

Shixiang Li, Xiaobing Niu, Guangdi Liu, Jihong Li, Mingliang Sun, Fuliang You, Haonan He. Formation and accumulation mechanism of shale oil in the 7th member of Yanchang Formation, Ordos Basin[J]. Oil & Gas Geology, 2020, 41(4): 719-729.

Figures/Tables 13

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Table 1

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层位	TOC/%		氯仿沥青“A”/%		(S₁+S₂)/(mg·g^-1)
层位	范围(样品个数)	均值	范围(样品个数)	均值	范围(样品个数)	均值
长7	0.19~35.85(703)	7.44	0.004~6.340(177)	0.670	0.06~94.02(203)	24.78
长7¹	0.28~25.60(149)	3.62	0.004~1.130(38)	0.310	0.42~51.11(42)	13.45
长7²	0.31~31.60(235)	5.02	0.024~1.500(52)	0.460	0.06~94.02(68)	14.95
长7³	0.19~35.85(319)	11.02	0.015~6.340(87)	0.860	0.71~80.66(93)	33.58

层位	长7³亚段	长7²亚段	长7¹亚段
还原S含量/%	5.40	2.13	1.05
V/(V+Ni)	0.84	0.79	0.75
V/Cr	6.10	2.07	1.69
U/Th	6.15	1.63	0.85
δCe	0.93	0.97	0.94
Ce_anom	-0.08	-0.05	-0.07
结论	强还原	强还原	还原

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Formation and accumulation mechanism of shale oil in the 7th member of Yanchang Formation, Ordos Basin

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