盖层突破压力的计算方法及应用

Calculation Method of Caprocks Breakthrough Pressure and Its Application

简要介绍了盖层突破压力的计算方法及盖层的评价方法。以实验数据为依据 ,建立了盖层突破压力与泥浆总孔隙度的关系。利用力学特性计算出相应的岩石力学参数、地层应力参数 ,并建立了地层应力状态下计算毛细管压力的力学模型 ,使计算结果更接近于地下实际情况。通过对LN、GD等几个地区 10几口井盖层突破压力的计算 ,评价了各盖层的质量 ,对地质家及测井解释人员分析油气聚集及运移提供了帮助。

Introduced are the calculation method of caprocks breakthrough pressure and evaluation method of caprocks. Established is the relation between breakthrough pressure and mud total porosity based on abundante test data. Calculated are the rock and formation stress parameter with mechanics law; built is the mechanics model of calculation of capillary pressure under the condition of formation stress, so, we can get more reliable information about the formation. Quality of the caprocks has been evaluated through calculating the pressures of 10 more wells in LN and GD zones, which helps the geologists and log analysts analyse oil & gas collection and migration.