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岩溶风化壳型气藏是一种重要的碳酸盐岩气藏类型,在我国广泛分布于鄂尔多斯盆地、塔里木盆地和四川盆地。受地层水影响,岩溶风化壳型含水气藏的开发面临极大的难题。该类气藏主要表现为储层大面积展布、多层含气,储层薄、丰度低、非均质性强,气井动态特征差异较大,生产井受地层水影响严重等特征。气水分布主要受区域构造背景、气源的充足程度、小幅度构造、储层的非均质性、沟槽的分布及构造反转的地质过程等因素影响。高桥地区完钻水平井动静态特征分析表明,地层水影响是造成水平井生产效果较差的主要因素。针对动态和静态方法在研究地层水分布特征的过程中存在的各自的缺点和不足,结合各自的优点,首次采用动静态结合的方法进行储渗体类型划分,将储层划分为高渗无水、高渗凝析水、高渗封存水、低渗封存水、低渗凝析水和低渗无水6种储渗体,同时在平面上明确各类储渗体分布特征。在气水分布控制因素及储渗体分布特征基础上,制定了岩溶风化壳型含水气藏开发技术对策,为该类气藏科学高效开发提供技术支撑。
Karst weathering crust gas reservoirs are an important type of carbonate reservoirs and are widely distributed in Ordos Basin, Tarim Basin and Sichuan Basin in China. Affected by formation water, the development of karst weathered crustal aquifer is facing great challenges. Such gas reservoirs are mainly characterized by large area distribution of reservoirs, multi-layer gas, thin reservoirs, low abundance, strong heterogeneity, large differences in dynamic characteristics of gas wells, and serious impact of production wells on formation water. The gas-water distribution is mainly affected by such factors as the regional tectonic setting, the abundance of gas sources, the small amplitude structure, the heterogeneity of reservoirs, the distribution of trenches and the geological process of structural inversion. The analysis of the dynamic and static characteristics of the horizontal well drilled in Takahashi area shows that the formation water influence is the main factor causing the poor horizontal well production. In view of the respective shortcomings and shortcomings of the dynamic and static methods in the study of formation water distribution characteristics and the combination of their respective advantages, the dynamic and static combined methods are used to classify the types of reservoir fluids for the first time. , High-permeability condensate water, high-permeability sewerage water, low-permeability sewerage, low-permeability condensate water and low-permeability water-6 kinds of reservoir infiltration body, at the same time in the plane clear all kinds of reservoir infiltration body distribution characteristics. Based on the controlling factors of gas and water distribution and the distribution characteristics of reservoir, the technical measures for the development of karst weathered shell-type water-bearing gas reservoirs are formulated to provide technical support for the scientific and efficient development of such gas reservoirs.