非均质稠油油藏储层测井响应特征及评价

Log response characterization and evaluation on heterogeneous heavy oil reservoir

非均质稠油油藏储层测井解释和评价难度较大。从非均质稠油油藏储层的特点和类型入手,分析储层的独特测井响应特征,并从油气运移和成藏、物理规律特性2方面对其进行解析,提出了层内流体细分测井精细评价模式。非均质稠油油藏储层包括层内油水倒置和层内油水间互2类储层,油水倒置储层非均质性弱,油水间互储层非均质性强。储层内部的"物性圈闭"与"油水重力分异异常"认识相结合,可较好地解析非均质稠油油藏储层的独特测井响应特征。提出并构建了非均质稠油油藏储层流体细分的测井精细评价方法,即孔隙度和含油饱和度重叠法、相渗曲线和可动流体综合法。实际应用证实,测井评价成果与试油结果相吻合。

According to the heterogeneous heavy oil reservoir definition, this paper discusses the reservoir character and classification, and summarizes the unique logging response characters of this reservoir such as upside down oil water location, abnormal oil and water relation. We think that the lithologic trap and abnormal oil-water gravity segregation phenomenon can explain the unique log response characters according to hydrocarbon migration and accumulation theory, then, we put forward new fluid typing method and new inlayer reservoir further classification evaluation method (NIRFCEM), and applied in field examples. This NIRFCEM is newly developed for inlayer lithofacies subdivision, and oil enrichment for logging evaluation. The newly founded NIRFCEM overlay methods for porosity and oil saturation, and effective permeability and movable fluid saturation achieve good geological consistency in practice, which supplies highly accurate logging evaluation results for the development and perforation optimization.