Major controlling factors and model of shale oil enrichment in Lower Permian Fengcheng Formation, Mahu Sag, Junggar Basin, NW China

JIANG Fujie, HU Meiling, HU Tao, LYU Jiahao, HUANG Liliang, LIU Chenglin, JIANG Zhenxue, HUANG Renda, ZHANG Chenxi, WU Guanyun, WU Yuping

doi:10.11698/PED.20220677

0 20230801 - 20230801

DOI: https://doi.org/10.11698/PED.20220677

Major controlling factors and model of shale oil enrichment in Lower Permian Fengcheng Formation, Mahu Sag, Junggar Basin, NW China

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1. State Key Laboratory of Petroleum Resources and Prospecting at China University of Petroleum (Beijing), Beijing 102249, China;
2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;
3. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China

Received date: 2022-10-07

Revised date: 2023-03-22

Online published: 2023-04-10

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Abstract

Based on the combination of core observation, experimental analysis and testing, geological analysis and numerical analysis, the main controlling factors of shale oil enrichment in the Lower Permian Fengcheng Formation in the Mahu Sag of the Junggar Basin are clarified, and a shale oil enrichment model is established. The results show that the enrichment of shale oil in the Fengcheng Formation in the Mahu Sag is controlled by the organic abundance, organic type, reservoir capacity and the amount of migration hydrocarbon in shale. The abundance of organic matter provides the material basis for shale oil enrichment, and the shales containing type I and II organic matters have good oil content. The reservoir capacity controls shale oil enrichment. Macropores are the main space for shale oil enrichment in the Fengcheng Formation, and pore size and fracture scale directly control the degree of shale oil enrichment. Short-distance migration of hydrocarbons in shale affects shale oil enrichment. The shale that has expelled hydrocarbons has poor oil content, while the shale that has received hydrocarbons migrated from other strata has good oil content. Lithofacies reflect the hydrocarbon generation and storage capacity comprehensively. The laminated felsic shale, laminated lime-dolomitic shale and thick-layered felsic shale have good oil content, and they are favorable lithofacies for shale oil enrichment. Under the control of these factors, relative migration of hydrocarbons occurred within the Fengcheng shale, forming the model of source-reservoir enrichment in shale. According to the process, the enrichment can be divided into: in-situ enrichment and migration enrichment. By superimposing favorable lithofacies and main controlling factors of enrichment, the sweet spot of shale oil in the Fengcheng Formation can be selected, which has indicative significance for the exploration and development of shale oil.

Key words： Junggar Basin; Mahu Sag; Permian Fengcheng Formation; shale oil; enrichment controlling factors; enrichment model

Cite this article

JIANG Fujie, HU Meiling, HU Tao, LYU Jiahao, HUANG Liliang, LIU Chenglin, JIANG Zhenxue, HUANG Renda, ZHANG Chenxi, WU Guanyun, WU Yuping . Major controlling factors and model of shale oil enrichment in Lower Permian Fengcheng Formation, Mahu Sag, Junggar Basin, NW China[J]. Petroleum Exploration and Development, 0 : 20230801 -20230801 . DOI: 10.11698/PED.20220677

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