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通过油源对比、地层系统、沉积体系、储层特征、盖层特征等基本地质特征的深入研究,对鄂尔多斯盆地延432井区生、储、盖的分布特征及组合方式、上古生界油气藏的分布特征及成藏组合类型进行探讨分析。研究表明:鄂尔多斯盆地延432井区上古生界烃源岩生烃级别为中~好,砂岩储集层基本都属于特低孔渗级别储层,盖层主要为石千峰组上部、石盒子中部和中下部、山西组山1段的3套区域泥岩。成藏组合类型包括三种类型:(1)山西组、太原组、本溪组地层中的源内自储式成藏组合,(2)本溪—太原组源内自储式基本成藏单元,(3)上石盒子组和石千峰组底层中的跨越式下生上储型成藏组合。
Through the deep research on the basic geologic features such as oil source contrast, stratigraphic system, sedimentary system, reservoir characteristics and cap rock characteristics, the distribution characteristics and assemblages of the reservoirs and cap rocks in Yan 432 well in the Ordos Basin, The distribution characteristics and the type of reservoir formation to explore and analyze. The results show that the Upper Paleozoic hydrocarbon source rocks in the Yan432 well in the Ordos Basin are moderately to moderately rich, and the sandstone reservoirs are basically of ultra-low permeability seepage reservoirs. The cap rocks are mainly composed of the upper part of Shiqianfeng Formation, In the lower part, there are 3 sets of mudstone in the first section of Shanxi Formation Mountain. There are three types of reservoir assemblages: (1) source-internal reservoir assemblages in the strata of Shanxi Formation, Taiyuan Formation and Benxi Formation; (2) self-reservoir basic reservoir units in Benxi-Taiyuan Formation; (3) Box group and the Shiqianfeng group by the bottom of the subsurface reservoir type reservoir combination.