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基于地质背景和储集层特征分析,利用构造、沉积、成岩、古地貌及物性测试、压汞实验、测井、岩心观察等资料,从宏观和微观两个方面分析鄂尔多斯盆地西北部下古生界马家沟组五段碳酸盐岩气藏气、水分布特征及主控因素。研究区马五段气、水分布规律比较复杂,主要表现为:平面上气层全区均匀分布,水层则零散且小面积集中,呈现出不连续的分布特征;纵向上不存在气、水互层的现象,成为气藏高效合理开发的难点。气水分布宏观上主要受古地貌与成岩作用控制,微观上主要受储集层的孔喉结构、连通性及源储间输导关系控制,天然气多聚集在岩溶斜坡上的古沟槽周边和缓丘部位,这些地区储集层物性较好,孔喉连通性好,源储之间没有铝土岩隔挡,利于天然气充注成藏。
Based on the analysis of the geological background and reservoir characteristics, the Lower Paleozoic in the northwestern Ordos Basin is analyzed from the macroscopic and microscopic perspectives by using the data of structures, sedimentation, diagenesis, palaeogeomorphology and physical properties, mercury intrusion porosimetry, logging and core observation Gas and Water Distribution Characteristics and Main Controlling Factors of the Carbonate Gas Reservoir in the Fifth Member of the Majiagou Formation. The distribution of gas and water in Mawu section of the study area is rather complicated. The main features are as follows: the whole area of the gas layer in the plane is evenly distributed, while the water layer is scattered and the small area is concentrated, showing a discontinuous distribution; there is no gas or water in the longitudinal direction The phenomenon of interlamination has become a difficult point for the efficient and reasonable development of gas reservoirs. The macroscopic distribution of gas and water is dominated by paleogeomorphology and diagenesis. The microscopic view is mainly controlled by the pore-throat structure and connectivity of the reservoir and the relationship between source and reservoir transport. Natural gas accumulates around the ancient trench on the karst slope Qiu site, reservoir properties in these areas is better, pore and throat connectivity, there is no bauxite block between the source reservoir, which will help natural gas filling reservoir.