An application of the composite index method to the heterogeneity of fluvial reservoirs: An example from the 34 reservoirs of the 2nd member of the Shahejie Formation in the 2nd district of the Shengtuo Oil Field
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摘要: 在储层建筑结构划分、测井多参数处理结果的基础上,根据熵的原理,应用熵权法定量计算了胜坨油田二区沙河街二段3砂层组4小层(简称沙二段34)河流相储层的非均质综合指数,按照不同的开发时期详尽分析了储层的层间、层内、平面非均质性特征,并阐述了储层非均质性的主要影响因素。结果表明:沙二段34储层层内、层间及平面非均质性中等-较强;随着注水开发的进行,非均质性有继续增强的趋势,平面非均质性较之层内和层间非均质性更强烈。同一小层及韵律层在不同开发时期的非均质程度有明显的差异。建筑结构控制储层非均质程度,成岩作用使非均质性复杂化,注采井网不完善加剧了非均质性的差异性。研究成果为剩余油的挖潜提供了重要依据。Abstract: The present paper gives a detailed description of interstratal, intrastratal and planar heterogeneity and its main influencing factors in the fluvial reservoirs of the 34 reservoirs in the 2nd member of the Shahejie Formation in the 2nd district of the Shengtuo Oil Field in the light of reservoir architectures and logging interpretation by using the entropy's method. The 34 reservoirs are turned out to be moderate to highly nonhomogeneous, and become progressively higher with the increase of water injection. The planar heterogeneity tends to be higher than the interstratal and intrastratal ones. The reservoir heterogeneity is believed to be controlled by reservoir architectures, and more complicated by diagenesis. The different heterogeneity tends to caused by deficient injection and production patterns. The heterogeneity index based on the entropy's method may be important to characterizing the heterogeneity of the fluvial reservoirs and predicting the distribution of residual oil.
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