鄂尔多斯盆地杭锦旗地区上古生界异常压力特征及形成机理

Characteristics and Formation Mechanism of Upper Paleozoic Abnormal Pressure in Hangjinqi Area of Ordos Basin

在砂岩实测压力的基础上,分析得出鄂尔多斯盆地杭锦旗地区现今异常压力的分布特征,即以泊尔江海子断裂为界,从南到北压力系数依次降低。包裹体结合泥岩压实曲线研究认为,该区早白垩世气藏存在异常高压,欠压实和构造挤压作用是其形成的主要因素:在断裂带以南欠压实起主要作用,在断裂带构造挤压起主要作用,在断裂带以北两者作用相当。由于侧向遮挡条件不好天然气散失作用是异常低压形成的主要原因。

Based on measured sandstone pressure,the distribution of abnormal pressure is studied in Hangjinqi area. Taking the Boerhaizi fault as the boundary,the pressure coefficient decreases from south to north. Research on inclusions and mudstone compaction curves shows that uncompaction and structural compression are the main factors resulting in abnormal high pressure in Early Cretaceous gas reservoirs. Uncompaction is the main cause of abnormal high pressure in the south of the fault,while structural compressio...