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大牛地气田奥陶系风化壳天然气资源量6.5×1011 m3,属鄂尔多斯盆地中部风化壳岩溶斜坡带,分布区域较为广泛,储层厚度大,是储层发育的有利区。但其具有储层品质低、渗透性差、有利古地貌单元分布局限、厚度薄、连片性差等缺点。对此,中国石化华北油气分公司在分析气藏地质特征的基础上进行科研攻关,掌握了天然气高产主控因素与特征,建立了大牛地气田奥陶系风化壳储层有利发育模式,明确了主力层位白云岩优质储层分布发育规律;建立了风化壳古地貌地震响应模式,得出了有利储层的展布特征。
Ordovician weathering crust in Daniudi gas field is 6.5 × 1011 m3, which belongs to the karst slope belt of weathering crust in central Ordos Basin. It has a wide distribution area and large reservoir thickness, which is a favorable area for reservoir development. However, it has some shortcomings such as poor reservoir quality, poor permeability, favorable distribution of paleogeomorphic units, thin thickness and poor continuity. In response, Sinopec North China Oil and Gas Branch Company conducted scientific research on the basis of analyzing the geological characteristics of gas reservoirs, grasped the controlling factors and characteristics of high-yield natural gas and established a favorable development model of Ordovician weathering crust reservoir in Daniudi Gas Field. The distribution pattern of high-quality dolomite reservoirs in the main strata is established. The seismic response model of the paleogeomorphic crust is established, and the distribution characteristics of the favorable reservoirs are obtained.