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Identification and evaluation of shale oil micro-migration and its petroleum geological significance.

Authors :
HU Tao
JIANG Fujie
PANG Xiongqi
LIU Yuan
WU Guanyun
ZHOU Kuo
XIAO Huiyi
JIANG Zhenxue
LI Maowen
JIANG Shu
HUANG Liliang
CHEN Dongxia
MENG Qingyang
Source :
Petroleum Exploration & Development; Feb2024, Vol. 51 Issue 1, p127-140, 14p
Publication Year :
2024

Abstract

Taking the Lower Permian Fengcheng Formation shale in Mahu Sag of Junggar Basin, NW China, as an example, core observation, test analysis, geological analysis and numerical simulation were applied to identify the shale oil micro-migration phenomenon. The hydrocarbon micro-migration in shale oil was quantitatively evaluated and verified by a self-created hydrocarbon expulsion potential method, and the petroleum geological significance of shale oil micro-migration evaluation was determined. Results show that significant micro-migration can be recognized between the organic-rich lamina and organic-poor lamina. The organic-rich lamina has strong hydrocarbon generation ability. The heavy components of hydrocarbon preferentially retained by kerogen swelling or adsorption, while the light components of hydrocarbon were migrated and accumulated to the interbedded felsic or carbonate organic-poor laminae as free oil. About 69% of the Fengcheng Formation shale samples in Well MY1 exhibit hydrocarbon charging phenomenon, while 31% of those exhibit hydrocarbon expulsion phenomenon. The reliability of the micro-migration evaluation results was verified by combining the group components based on the geochromatography effect, two-dimension nuclear magnetic resonance analysis, and the geochemical behavior of inorganic manganese elements in the process of hydrocarbon migration. Micro-migration is a bridge connecting the hydrocarbon accumulation elements in shale formations, which reflects the whole process of shale oil generation, expulsion and accumulation, and controls the content and composition of shale oil. The identification and evaluation of shale oil micro-migration will provide new perspectives for dynamically differential enrichment mechanism of shale oil and establishing a "multi-peak model in oil generation" of shale. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20964803
Volume :
51
Issue :
1
Database :
Supplemental Index
Journal :
Petroleum Exploration & Development
Publication Type :
Academic Journal
Accession number :
175784601
Full Text :
https://doi.org/10.1016/S1876-3804(24)60010-8