Geological characteristics and accumulation controlling factors of shale  reservoirs in Fengcheng Formation, Mahu sag, Junggar Basin

doi:10.3969/j.issn.1672-7703.2019.05.008

Abstract

Abstract: The Fengcheng Formation in Mahu sag in the Junggar Basin is important for successive exploration of continental shale oil in China. In order to provide basic data for future exploration and deployment, and enrich continental shale oil accumulation theory, the geological characteristics and accumulation mechanism of the shale oil in the Fengcheng Formation were studied through comprehensive analysis of seismic, well logging, mud logging and well test data, core, source rock pyrolysis, and casting thin sections. The results show that the Fengcheng Formation is composed of mixed rocks depositing in an alkaline lake environment under the sedimentary control of mechanical, chemical, biological and volcanic activities. The Formation is divided into three lithologic members from the bottom to the top. Source rocks with algal organic matters can be found in the whole Formation. The most developed source rock interval is the developed sweet spot interval. The sweet spot interval and the source rock interval are interbedded or in the same interval. The Feng 1 and Feng 2 Members have sweet spots of silty sandstone and dolomite, and the Feng 2 Member has sweet spots of dolomite. The sweet spots are distributed in source rocks and alkaline mineral layers. Organic-rich source rocks, sedimentary microfacies, lithology and structural fractures control the accumulation and distribution of the shale oil.

CLC Number:

Zhi Dongming, Tang Yong, Zheng Menglin, Xu Yang, Cao Jian, Ding Jing, Zhao Changyong. Geological characteristics and accumulation controlling factors of shale reservoirs in Fengcheng Formation, Mahu sag, Junggar Basin[J]. China Petroleum Exploration, 2019, 24(5): 615-623.

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Geological characteristics and accumulation controlling factors of shale reservoirs in Fengcheng Formation, Mahu sag, Junggar Basin

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