综合指数法在河流相储层非均质性研究中的应用

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组二段3砂层组4小层（简称沙二段34）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34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要更强烈一些。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。研究成果为剩余油挖潜提供了一种可行方法。

Applying of method of composite index in heterogeneity study of fluvial reservoir

Reservoir heterogeneity is one of main factors that influence fluid distribution and migration of fluvial reservoirs.It also influences oil and gas exploitation result.Applying the division result of architecture，the theory of reservoir geology and the newest research method and the result of log interpretation，reservoir heterogeneity index is computed in terms of entropys theory.Interlayer，intrastratal，plane and spatial heterogeneity are analyzed in term of different exploitation periods.Main influential factors of reservoir heterogeneity are analyzed.The relation between heterogeneity and remaining oil is opened out.The results are as follows：Heterogeneity index is first computed in the work area which conquers the shortcoming of multi parameter inconsistent characterization.Digital model is first established in term of exploitation period which shows the degree of reservoir heterogeneity becomes stronger.Architectures control the heterogeneous degree，diagenesis makes heterogeneity complicated and the deficient injection and production pattern increases the heterogeneity in evidence.Practice shows that heterogeneity index in terms of entropys theory can acts as important function in characterizing fluvial reservoir heterogeneity and in predicting distribution of remaining oil.