运用声-电成像测井评价川东北飞仙关组鲕滩储层

Using Acoustic and Resistivity Imaging Logs to Evaluate Oolitic Beach Reservoir in Feixianguan Formation in East Sichuan

在对鲕滩储层基本地质特征进行分析的基础上,提出了应用纵横波速度比和电成像资料结合的方法对鲕滩储层岩性进行识别。实际运用中纵横波速度比值不仅与储层含流体性质有关,还受岩性、孔隙度、岩石所承受的有效应力、裂缝等因素的影响。对鲕滩储层流体性质的识别是利用泊松比与体积压缩系数重叠和纵横波时差比与纵波交会识别流体性质;对鲕滩储层的孔隙型、裂缝型、裂缝-溶洞型等典型储层进行了深入的剖析和储层类型划分。通过对实例的剖析研究,在应用上取得了很好的效果,对同类储层评价具有一定的参考价值。

On the basis of analyzing the basis geologic characteristics of oolitic beach reservoir, proposed is a method for this reservoir lithology identification using conventional P-wave/S-wave velocity ratio and electric imaging log data. In practical use, the P-wave/S-wave velocity ratio is not only related with the reservoir fluid properties, but also affected by lithology, porosity, effective stress bore by rocks, fractures and so on. In the oolitic reservoir fluid properties recognition, used are ratio of P-wave/S-wave interval transit time ＆ P-wave interval transit time cross- plot technique as well as Poisson＇s ratio ＆ volume compression factor overlay method. The oolitic beach reservoir types in Feixianguan Formation in east Sichuan basin are classified as following. porous reservoir, fractured reservoir, fractured-cavernous reservoir, and the like. Field log examples prove the above techniques have been successfully used in the oolitic reservoir evaluation and also provide a good reference for the same type of reservoir evaluation.