苏丹某油气田低电阻率油气层测井解释评价方法研究

Research of Logging Interpretation and Evaluation Method in Low Resistivity Oil and Gas Reservoir

苏丹某油气田测井评价中存在可产纯油气的低电阻率油气层漏失的问题。通过岩心及毛细管压力分析,认为该地区低电阻率油气层成因主要是微观上毛细管的非均质性造成的毛细管束缚水含量高。利用常规测井资料中的声波电阻率叠合技术和核磁资料相结合识别低电阻率储层,采用可变m、n法的广义阿尔其公式有效评价含油气饱和度。采用集油藏模型、小层对比、岩石物理实验、试油成果、测井解释模型及解释参数的选择于一体的综合检验图,验证了对于该地区低电阻率成因认识的正确性和解释手段的适用性。用该方法重新处理解释该区20口井,新增油层45个层/127.6 m,油水同层23个层/133 m。并在该油气田的试油中取得了很好的效果,单层最低估计新增储量216.089×104t。

Low resistivity oil and gas reservoir logging interpretation evaluation is one difficult problem in ×× field of Sudan. Base on the origins of low resistivity, character of logging curves and testing data, one evaluation method was formed. At the same time the method checked by several kinds of data and testing. With analysis core data the complicated pore structure made the XX oilfield had high capillary bond water content is the main origins of low resistivity, evaluated the low resistivity reservoir with the acoustic-resistivity overlap method and CMR data, calculated the oil saturation with variable m, and n method. The method has got effective result.