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鄂尔多斯盆地富县地区延长组长8~2储层物性差、非均质性强,试油成功率低。为弄清本区长8~2油藏含油分布规律,利用岩心薄片资料与粒度分析相结合、扫描电镜与铸体薄片相结合,系统分析富县地区长8~2油藏岩石学特征。在此基础上,根据密闭取心、高温岩电数据分析研究区长8~2储层的含油性及其平面分布规律。结果表明,长8~2储层砂岩类型为长石砂岩,填隙物含量不高(平均7.1%),以绿泥石和方解石为主,物性较差,属于低(特低)孔-特低(超低)渗储层。长8~2储层密闭取心获得平均含油饱和度为39.3%,利用高温岩电和阿尔奇公式计算,长8~(2-1)小层和长8~(2-2)油饱和度分布范围32.0%~68.7%之间,含油饱和度呈条带状或片状分布于道主河道区域,且分布面积广、连片性好。
The Ordos Basin Fuxian area Yanchang Formation 8 ~ 2 reservoir physical properties, heterogeneity, low success rate of the test. In order to understand the oil distribution of reservoirs 8-2 in this area, the lithology characteristics of Chang 8-2 reservoirs in Fuxian area were systematically analyzed using the combination of core slice data and grain size analysis. On this basis, according to the closed coring and high temperature rock electric data analysis, the oil content and its plane distribution of the 8-2 reservoirs are studied. The results show that the sandstone of Chang 8 ~ 2 reservoir is of the type of feldspar sandstone with low content of interstitial (average 7.1%), mainly chlorites and calcites, with poor physical properties, which are low (low) (Ultra-low) seepage reservoir. The average oil saturation of the airtight coring of 8 ~ 2 reservoirs was 39.3%. According to the high temperature rock electric and Archie formula, the length of 8 ~ (2-1) layer and the oil saturation of 8 ~ (2-2) The distribution ranges from 32.0% to 68.7%. The oil saturation is distributed in strip or sheet form in the main channel of the main channel, and the distribution area is wide and the contiguity is good.