储层不确定性评价

Appraisement of the uncertainty of reservoir

陆相碎屑岩储层非均质性严重,在已有资料的基础上通常得不到对储层确定的认识.储层随机建模技术可以产生多个等概率实现,通过对这些实现的对比研究,可以有效地认识储层的不确定性,降低开发决策的风险.在坪北油田沉积微相模型研究中,首先利用高分辨率层序地层学原理进行地层划分对比,建立构造模型;然后以中期旋回为单位利用顺序指示模拟方法建立了沉积微相三维模型.通过对多个实现的对比研究,较好地认识了储层的不确定性.

The heterogeneity of continental clastic reservoir is often serious, so we cannot get a deterministic understanding about such reservoir according to the data we can get. In other words, there is the uncertainty of reservoir. The uncertainty of reservoir can be appraised through analyzing and comparing the several realizations with equiprobability generated by stochastically modeling, which can reduce the risk of development decision-making. In the research of the sedimentary microfacies model for Pingbei oilfield, three intermediate cycles are identified by using high-resolution sequence stratigraphy. A three-dimension model of each intermediate cycle (sequence) is established by using sequential indicator simulation, and the more clear knowledge about the uncertainty of reservoir is obtained through the analysis and comparison of the obtained realizations.