储层地质模型建立方法--以坪北油田延长组长6段为例

采用高分辨率层序地层学原理对坪北油田地层进行划分和对比．对目的层识别出3个中期旋回。以中期旋回为单位采用顺序指示模拟方法建立沉积微相三维模型．采用相控物性参数建模技术，利用顺序高斯模拟方法建立孔隙度、渗透率的三维模型。采用逐点比较的方法．抽稀检验了沉积微相三维模型．结果表明．分三种微相类型的符合率为66．4％．只分砂泥岩的符合率为84％；利用多个实现的概率分布能够较好地预测微相分布。

Methods for Establishing Reservoir Geological Model-By Taking Chang 6 Section of Yanchang Formation in Pingbei Oilfield for Example

The principle of high resolution sequence stratigraphy is used for strata dividing and contrasting in Pingbei Oilfield, three medium cycles are recognized for a target zone. 3D models of sedimentary microfacies are established by using sequential indicator simulation and taking the medium cycle as unit. The modeling technique of facies controlled physical parameters is used to establish 3D porosity and permeability models with Gauss simulation method. A level by level correlation is deployed for spot checking the 3D sedimentary microfacies model. The result shows that the coincidence rate of 3 types of microfacies is 66.4%, the coincidence rate for only dividing sand shale is 84%. The probability distribution of multi-realizations can be used for forecasting the microfacies distribution well.