用非均质性综合指数研究大路沟A区储集层

Application of Heterogeneity Index to Study of Block-A Reservoir in Dalugou Area of Jing'an Oilfield,Ordos Basin

以靖安油田大路沟A区三叠系延长组长2碎屑岩储集层为例，运用灰色关联分析法与非均质性综合指数分析了储集层非均质性。结果表明，靖安油田大陆沟A区长2油层组储集层非均质性总体偏弱，储集层质量较好；东部地区储集层非均质性相对较弱，西北和西南地区储集层非均质性较强，自东向西非均质性有逐渐变强的趋势。储集层非均质性主控因素为层内夹层，受控于沉积微相。注水见效较快的区域，非均质综合指数为0．65-0．75，是剩余油分布的有利地区。灰色关联分析法计算简单，运算速度快，能够准确地求取各参数的权重系数。引入非均质综合指数能够克服单一因素表征储集层非均质性的不足，结合高斯随机模拟，实现了储集层非均质性的定量表征。

The reservoir heterogeneity index and grey association analysis were used to study the reservoir heterogeneity in Chang-2 clastic reservoir of the Triassic Yangchang formation of Block-A in Dalugou area of Jing＇ an oilfield in Ordos basin. The result shows that the Chang-2 reservoir of Block-A is totally good in quality, the reservoir heterogeneity in the east area is relatively weak than the northwest and south-west areas. The heterogeneity trend gradually becomes stronger from the east to the west. The main controlling factors are the interlayers and sedimentary microfacies. The quicker response area after water injection could be the favorable area in remaining oil distribution, where the regional heterogeneity index ranges from 0.65 to 0.75. The study also indicates that the gray association analysis is simple and fast in calculation to more accurately give the weight coefficients of each parameter. The reservoir heterogeneity index can be used to over-come the lack of a single factor characterization of reservoir heterogeneity. Combined with the Gaussian random function simulation, a quan-titative characterization of the reservoir heterogeneity is also realized.