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鄂尔多斯盆地中奥陶统马家沟组地层由于受加里东运动影响而隆起抬升遭受风化,形成良好的岩溶油气储层。该文从靖边潜台西侧马五4亚段的岩石学特征、古地貌、岩溶机质着手对古岩溶储层发育特征进行深层次的刻画。确定了研究区西高东低的古地貌形态,进一步将岩溶地貌划分为岩溶高地和岩溶斜坡两大地貌,而岩溶斜坡中又包含多个岩溶洼地和残丘。通过对古岩溶机制的研究得出了古岩溶的溶蚀模式,即是由多个渗流带-潜流带-缓流带所组合形成的多旋回的岩溶组合特征。最后分析了影响岩溶储层的各重要因素及孔隙组合类型,以期今后在该区寻找有利储层提供一定的地质依据。
The Middle Ordovician Majiagou Formation in the Ordos Basin, due to the Caledonian movement, was uplifted and weathered by weathering and formed a good karst hydrocarbon reservoir. This paper starts from the petrological characteristics, paleogeomorphology and karst facies in the fifth sub-section of Ma-5 on the west side of the Jingbian submarine to describe the deep-seated features of the paleokarst reservoir. The paleogeomorphology of the east and west of the study area is determined. The karst topography is further divided into two major types of karst highlands and karst slopes, while the karst slopes contain several karst depressions and remnant mounds. Through the study of palaeokarst mechanism, the dissolution pattern of paleokarst is obtained, that is, polycyclic karst assemblage formed by a combination of multiple seepage zones - subsurface flow zones and slow flow zones. Finally, it analyzes the important factors affecting the karst reservoirs and the type of pore assemblages, in order to provide some geological evidences for finding favorable reservoirs in this area.