准噶尔盆地玛湖凹陷百口泉组地层圈闭成藏主控因素与定量评价OA

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 alka-line 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 sand-stones.This combination provided the Mahu Sag with stable source conditions and favorable reservoir settings.Moreo-ver,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.