塔河油田碳酸盐岩储层孔隙度模型的改进

The porosity interpretation model for carbonate reservoir in Tahe Oilfield

（中国石化西北分公司勘探开发规划设计研究院，新疆乌鲁木齐 830011）

(Academy of Exploring Exploiting Designing and Planning, NWPB, SINOPEC. Urumqi 830011 China )

塔河油田各区块碳酸盐岩储层流体具有不同的相态和特性，常规孔隙度解释模型受储层流体相态影响较大，且存在缺陷。通过递归分析受流体相态影响较小的测井资料，建立了新的有效孔隙度、裂缝孔隙度计算模型。将用新模型计算的有效孔隙度和解释的裂缝与录井和岩心观测结果进行了比较，吻合度较高；递归分析得到的胶结指数（m）和弯曲指数（a）较好地反映了储层的结构特征，与岩电分析结果吻合；利用m和a这2个参数计算的裂缝含水饱和度资料解释出的油层与测试结果基本吻合。实际应用表明，递归方程适用于不同的区块。

The phase states and features of reservoir fluid in the different area of Tahe oil-field are not all the same. The conventional interpretation model of porosity is affected by the reservoir fluid phase state in great degree and not perfect. The new effective and fracture porosity calculation model is set up through the regression analysis of resistivity and porosity data which is not affected by fluid phase state largely. As a result, the precision of total effective porosity is improved by the new model and the formation cementation index calculated meets with the analysis results of formation resistivity. The development intervals of fracture porosity matches with the development intervals by core observation, the oil layer interpreted by the data of fracture water saturation on the basis of new model is proved by testing. The new porosity model is a summarization and integration of effective regression relation. It is adaptive to different areas through the changes of regression equation or parameters and relatively extensive practical.