Influence of intrasource micro-migration of hydrocarbons on the differential enrichment of laminated type shale oil: a case study of the third sub-member of the seventh member of the Triassic Yanchang Formation in Ordos Basin

doi:10.3969/j.issn.1672-7703.2023.04.005

Abstract

Abstract: Influenced by multi type and high density laminae of continental shale, the differential intrasource micro-migration of hydrocarbons is an important factor controlling the oil-bearing property and mobility of the laminated shale with various lithofacies. By taking the systematic shale coring sections in 10 wells in Ordos Basin as the research object and using laboratory experimental results such as XRD, thin section observation, SEM, nitrogen absorption, laser scanning confocal, geochemical test, as well as wireline logging and well testing results,the hydrocarbon micro-migration inside shale section in the third sub-member of the seventh member of the Triassic Yanchang Formation (referred to as Chang 7₃ sub-member) and the mechanism are analyzed. The study results show that the micro-millimeter scale migration generally occurred of crude oil generated by organic-rich laminated shale. Among them, hydrocarbon generation pressurization provided forces for micro-migration; The frequently developed brittle laminae provided a large amount of reservoir space for the micro migrated hydrocarbon; The hydrocarbon generation pressurization fractures, foliation fractures, and micro fractures provided pathways for micro-migration; The different mineral compositions of the laminae resulted in hydrocarbon differentiation. The combination type of laminae and differential micro-migration mechanism determine that the felsic laminated shale and tuffaceous laminated shale have relatively good oil-bearing property and mobility, which are the main lithofacies types for risk exploration of medium-high maturity laminated type shale oil. The commercial oil flow of more than 10 t/d was obtained in pilot test of Chang 7₃ sub-member shale in seven vertical wells, confirming that shale section in Chang7₃ sub member has good oil-bearing property, and there is a high potential of production increase by horizontal well development, which is expected to be a replacement field for reserve and production increase of shale oil in Ordos Basin.

CLC Number:

TE112

Li Shixiang, Guo Qiheng, Pan Songqi, Zhou Xinping, Guo Ruiliang. Influence of intrasource micro-migration of hydrocarbons on the differential enrichment of laminated type shale oil: a case study of the third sub-member of the seventh member of the Triassic Yanchang Formation in Ordos Basin[J]. China Petroleum Exploration, 2023, 28(4): 46-54.

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