低渗透砂岩储集层油藏评价一体化研究方法及应用

Method of integrated studies for low permeability reservoir and its application

随着陆上油田开发难度的不断增大,传统单一的油藏勘探开发方法已经不能满足日益复杂的油藏情况。鄂尔多斯盆地某油田长63油层组属于典型的陆相成因的油气储集层,具有非均质性强、储集层物性差、储量丰度低的特点。介绍了现代油藏描述和油藏数值模拟技术一体化研究思想,针对研究目的层组的地质特征,首先应用随机建模技术建立精细油藏地质模型,并应用网格粗化技术将精细地质模型粗化到油藏数值模拟器能接受的数值模型,最后通过数值模拟中的历史拟合、参数调整步骤,完善地质模型,优化油藏地质认识。生产实际表明,通过一体化技术进行复杂油藏研究能较好解决石油地质研究和油藏工程的衔接问题,能从动态和静态角度研究油藏,为油藏开发的动态预测和方案优化奠定了基础。

The exploration and development of oil reservoir are getting more difficult today, and the traditional methods of exploration and development can＇t meet the progressively complicated conditions. The Chang 63 Member of Yanchang Formation, Ordos Basin is a typical continental reservoir, with the features of high heterogeneity, low porosity and permeability, and low abundance. With the ideas of integrated reservoir studies, i.e. reservoir description and reservoir numerical simulation techniques, the paper tries to study the Chang 6^3 Member with dynamic and statistical information. First, the refined 3-D visual reservoir characteristics of the target Layer were established by using the method of three-stage stochastic modeling. The reservoir numerical simulation model was developed from the refined 3-D geologic reservoir model by using the grids upscaling technology. The most reasonable oil reservoir model was achieved on the basis of the techniques of history matching and parameters adjustment. The practical production results indicate that the technology of integrated reservoir studies with reservoir description and numerical simulation can better resolve the complicated problems of oil reservoir.