变质岩储层优势岩性测井解释

Log Evaluation of Dominant Lithology in Metamorphic Reservoir

储层优势岩性评价是变质岩油气藏勘探的基础。通过对××油田变质岩储层典型井的岩心观察,以地质认识为指导,利用岩心、常规及高分辨率成像测井数据,系统总结变质岩岩性测井响应特征及有效性识别方法。总结4种类型的变质岩岩性测井响应特征,利用孔隙度测井系列结合成像对变质岩岩性进行有效识别,提出了基于成像的变质岩岩性测井多图版识别方法。进一步通过成像结合核磁共振进行变质岩储层裂缝识别及有效性分析,建立该地区变质岩优势岩性相。生产应用中评价多口井资料,取得较精确的变质岩岩性及储层有效性评价效果。

The lithology evaluation of reservoir is the basis for oil and gas exploration in metamorphic rock.Based on the core observation of the typical wells in the metamorphic rock reservoirs of the XX oilfield and the geological understanding,this paper makes full use of core,conventional logging and high-resolution imaging logging to systematically summarize the log response characteristics of lithology in metamorphic rock and the identification methods for effective reservoir.A total of four types of lithologic log response characteristics are summarized.Its main principle is to use the porosity logging program and imaging logging to effectively identify lithology of metamorphic rock,based on the imaging logging,a logging multi-plate identification method for metamorphic rocks is established.In addition,the problem of fracture identification and effectiveness evaluation of metamorphic rock reservoirs are solved by imaging logging and nuclear magnetic resonance logging,and the dominant facies of metamorphic rocks in this area is determined.This method has been applied to the multiple wells and obtain great result on lithology identification and effectiveness evaluation of reservoir.