电成像测井在东濮凹陷裂缝性砂岩储层评价中的应用

Application of EMI in evaluation of fractured sandstone reservoirs in the Dongpu Sag

为有效识别和精确评价以"双孔介质"为特征的东濮凹陷三叠系致密砂岩裂缝性储层,通过对电成像测井资料的地质应用研究,完善了其在裂缝定性识别与定量评价、地层产状描述、井旁构造分析、地应力分析及岩性识别方面的应用。用岩心刻度电成像测井(EMI)、再用电成像测井刻度常规测井,在地质条件及测试资料的约束下,总结出三叠系砂岩裂缝性储层的测井响应特征,进而形成了一套划分裂缝性储层的有效方法。据已测试的10口井分析,该评价方法的测井解释符合率达84.3%,提高了测井对三叠系裂缝性储层的识别能力。

In order to effectively identify and accurately evaluate the Triassic fractured tight-sandstone reservoirs featured in ＇ double porosity medium＇ , the author strengthened geological application research of the electro-imaging logging data and improved its applications to qualitative identification and quantitative evaluation of fractures,formation occurrence description,analysis around wells,earth stress analysis and lithologic discrimination, and etc. Core data were used to calibrate electro-imaging logging（EMI） ,which was used in turn to calibrate conventional general well-logging. The log responses of the Triassic fractured sandstone reservoirs are summarized under the constraints of geologic conditions and test data. And based on all these, the author proposed a set of effective method for classifying fractured reservoirs. The testing results of ten wells indicate that the coincidence rate of log interpretation with the method is up to 84.3 %. The application of the log interpretation of fractured reservoir improves the fractured reservoir identification through well-logging.