灰色关联方法在低渗储层评价中的应用

Application of Grey Correlation Method in Reservoir Evaluation of Low Permeability Oilfield

低渗储层的评价对单井生产动态分析和经济开发具有重要的指导意义。从储层沉积环境、储层规模、储层物性、储层含油性和储层改造选取储层评价基础参数,运用聚类分析,计算各基础参数的相关性,优选出储层评价参数为砂岩厚度、泥质含量、孔隙度、渗透率、沉积微相类型。依据灰色系统理论关联分析法,确定各参数的权系数,同时对储层多个影响因素进行综合评价,计算得到综合评价指标,并依据综合评价指标对储层进行评价分类。实例应用表明,延长油田樊川区储层可分为四类,按储层品质由高到低依次为:I类储层,II类储层,III类储层和非储层。分类结果与油田实际情况相符,能够很好的解释不同区域单井生产动态的差异性。本文建立的储层评价方法立足于实际数据,通俗易懂,简便易行,值得在延长油田低渗储层区域推广。

The grey correlation method was applied into reservoir evaluation of Fanchuan area in Yanchang oil field. Firstly, the characteristic parameters of low permeability reservoir in the interest area with the relative independence were selected as follows： sand thickness, shale content, porosity, permeability and sedimentary micro-facies types. Secondly, the parameters weight was determined through the correlation analysis method of grey system theory. Finally, the comprehensive evaluation index including these influencing factors was obtained, and the reservoir was evaluated. The established method is based on the actual data, and it is simple. The method is also worth to be extended to other low permeability reservoirs of Yanchang oil field.