地质科学2026，Vol.61Issue(1)：42-58,17.DOI:10.12017/dzkx.2026.004
鄂尔多斯盆地东部高家堡地区马家沟组盐下输导体系地质建模和油气运移模拟研究
Geological modeling of subsalt carrier system and hydrocarbon migration simulation in the Majiagou Formation in the Gaojiabu area,eastern Ordos Basin
摘要
Abstract
The Ordovician subsalt carbonates in the central and eastern part of the Ordos Basin are a hot topic for deep marine strata exploration.The subsalt strata of the Majiagou Formation are gas-bearing over a large area but show complex gas/water relationships and unclear enrichment patterns restricting future gas exploration.Taking the Gaojiabao area as an example,this study combines geological and geophysical methods to establish an architectural heterogeneity model of the subsalt reservoirs with multiple-constrained unit reservoir filling modeling.On this basis,this study establishes carrier system models during different key migration and accumulation periods,which precisely depict architecture,transport properties and fluid connectivity at different scales of carrier beds.Hydrocarbon migration and accumulation and late adjustment processes are simulated,and main controlling factors and rules of migration and accumlation are summarized.The results show that the subsalt carbonate reservoirs of the Majiagou Formation in the Gaojiabao area are mainly composed of mound-shoal composite unit reservoir bodies that laterally migrate and are superimposed vertically.Impulsive faulting and fracturing play an important role in improving the connectivity between these reservoir bodies.Oil and gas migration and accumulation mainly occur in the fault-related,interconnected reservoir bodies with good transport performance,and gas accumulations present a series of small"potato-shaped"accumulations.Under influence of late tectonic adjustments,gas invariably migrates upward along faults,which may lead to an increase in gas accumulations in the reservoirs interbed with salt deposit in the lower part of the Ma 5 member.The formation and enrichment of subsalt gas accumulation are mainly determined by reservoir architectural heterogeneity and fault-related adjustment process during late tectonic uplift.Except for the western fault zone,the Ma 4 member and the lower part of the Ma 5 member in the southeastern part of the study area are favorable targets for future exploration.关键词
鄂尔多斯盆地/马家沟组盐下/储层非均质性/输导体系/油气运移模拟Key words
Ordos Basin/Majiagou Formation subsalt/Reservoir heterogeneity/Carrier system/Hydrocarbon migration simulation分类
天文与地球科学引用本文复制引用
曹斌风,魏柳斌,罗晓容,王前平,于洲,师平平,周路..鄂尔多斯盆地东部高家堡地区马家沟组盐下输导体系地质建模和油气运移模拟研究[J].地质科学,2026,61(1):42-58,17.基金项目
新型油气勘探开发国家科技重大专项"深层海相油气成藏地质条件及增储领域研究"(编号:2025ZD1400203)和中国石油长庆油田公司重大科技专项"鄂尔多斯盆地深部层系构造—沉积环境、成藏条件与有利勘探区带研究"(编号:2024D1JC06)资助 （编号:2025ZD1400203）
