Microscopic Occurrence and Production Dynamics of Shale Oil in Lucaogou Formation, Jimsar Sag, Junggar Basin

doi:10.7657/XJPG20250604

Abstract

Abstract:

Complex microscopic occurrence and unclear production dynamics of shale oil in continental saline lacustrine basins challenge the study of shale oil enrichment theory and development law. Taking the Lucaogou formation in the Jimsar sag of Junggar Basin as an example, this paper characterizes the fluid occurrence state and mobility in the shale reservoirs using the techniques such as nuclear magnetic resonance, confocal laser scanning microscopy, argon ion polishing, and scanning electron microscopy, and validates against the monitoring results of produced fluid from individual wells in the pilot test area. The results show that the microscopic occurrence of the shale oil is characterized by oil fully saturating nanopores and both oil and water coexisting in sub-micron to micron-sized pores, with light and heavy components in hydrocarbons arranged in an onionskin pattern. The natural depletion of shale oil prefers the light hydrocarbon components stored in sub-micron to micron-sized pores, where free water is involved in the fluid flow. Changes in crude oil properties and produced water during well production represent effective responses to the microscopic fluid occurrence state. Shale oil well production is featured with by long-term water production and sequential producing of light and heavy components.

Key words: Junggar Basin, Jimsar sag, Lucaogou formation, shale oil, microscopic occurrence state, dynamic response

CLC Number:

TE122

LIU Jin, BAI Lei, ZHANG Baozhen, WEI Chao, LEI Haiyan, DENG Yuan, CAO Jian. Microscopic Occurrence and Production Dynamics of Shale Oil in Lucaogou Formation, Jimsar Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2025, 46(6): 684-692.

Figures/Tables 7

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Table 1.

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抽提物	抽提条件	亚甲基与甲基含量比	有机质烷基链碳原子数	有机质正构烷基链碳原子数
沥青1	二氯甲烷∶无水甲醇为93∶7，直径为1.0~2.0 cm，碎样，抽提72 h	1.81	13.07	7.69
沥青2	二氯甲烷∶无水甲醇为93∶7，直径为0.5~1.0 cm，碎样，抽提72 h	2.14	14.24	8.08
沥青3	二氯甲烷∶无水甲醇∶丙酮为2∶1∶1，直径为120~180 μm，粉末样，抽提72 h	2.40	15.63	8.54
沥青4	二氯甲烷∶无水甲醇∶丙酮为2∶1∶1，直径为96~120μm，粉末样，抽提72 h	4.95	33.59	14.53