Controlling factors and quantitative evaluation of stratigraphic-trap accumulation in the Baikouquan Formation, Mahu Sag,Junggar Basin

doi:10.3969/j.issn.1006-6535.2026.01.006

Abstract

Abstract: To clarify the main controlling factors for formation of stratigraphic-unconformity hydrocarbon traps in the Baikouquan Formation of the Mahu Sag in the Junggar Basin,petroleum geology theory and probabilistic methods were applied to systematically analyze the reservoir architecture,identify and quantify the primary geological influencing factors,and a set of comprehensive quantitative evaluation methods were formulated.The results showed that,under the Mahu Sag's paleo-geomorphology and characteristic sedimentary system,the hydrocarbon generation areas were alkaline with abundant algal organisms; the source rocks were rich in organic matter with high conversion rates and great hydrocarbon-generation potential;and these were accompanied by extensively distributed heterogeneous tight sandstones.This combination provided the Mahu Sag with stable source conditions and favorable reservoir settings.Moreover,the combined unconformity-fault system allowed hydrocarbons to escape from source layers and migrate along faults into reservoirs with integrity and effective retention.Thestudy offers a critical basis for quantitative evaluation of reservoirs in the Mahu Sag,significantly improving accuracy and providing valuable guidance for further exploration.

Key words: stratigraphic trap, trap effectiveness, Baikouquan Formation, Mahu Sag, quantitative evaluation

CLC Number:

TE122.1

LI Yipu, WAN Zexin, ZHENG Menglin, WANG Xiaolong, BAO Yiyao, AN Zhiyuan, CHEN Hong, XIAO Qilin. Controlling factors and quantitative evaluation of stratigraphic-trap accumulation in the Baikouquan Formation, Mahu Sag,Junggar Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(1): 52-59.

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