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环江地区长7储层底部广泛发育张家滩高阻泥岩,为中生界优质烃源岩,源储接触关系明显,砂体含油饱和度高,是勘探开发的重要储层。以岩心观察的岩石相标志及测井相分析为基础,通过地层砂地比、单井相剖面的相序分析,对鄂尔多斯盆地环江地区长7储层沉积相类型及发育规律进行综合研究。结果表明:环江地区长7期主要沉积体系属于河流三角洲相和湖泊相沉积体系,发育三角洲前缘亚相和浊积扇亚相,主要沉积微相类型包括有水下分流河道、水下天然堤、分流间湾、浊积水道、浊积水道前缘、浊积水道间。根据沉积微相展布和演化规律可以得出研究区的沉积模式。
The Zhangjiatan high-resistivity mudstone is widely developed at the bottom of Chang 7 reservoir in the Huanjiang area. It is a high-quality source rock in the Mesozoic with obvious source-reservoir contact and high oil saturation. It is an important reservoir for exploration and development. Based on the lithofacies markers and log facies analysis of core observation, the sedimentary facies types and development patterns of Chang 7 reservoir in the Huanjiang area of Ordos Basin are comprehensively studied through the phase sequence analysis of formation sand ratio and single well facies. The results show that the main sedimentary system in the Huanjiang area belongs to the delta and lacustrine facies sedimentary system in the delta and the delta front and the turbidite fan subfacies. The main sedimentary microfacies include underwater distributary channel, underwater natural Dike, shunt bay, turbid water channel, turbid water channel front, turbid water channel. According to the distribution and evolution of sedimentary microfacies, the sedimentary model of the study area can be obtained.