鄂尔多斯盆地定边地区长2储层非均质性研究

在岩心资料和测井数据统计的基础上,通过定量计算定边地区长2储层的渗透率变异系数、突进系数和级差等参数,对储层的层内、层间及平面非均质性进行了研究。长2储层各砂层组主要为三角洲平原的分流河道砂体,层内非均质性较弱;储层内部单砂层数多,泥质夹层和隔层发育,层间非均质性较强;在平面上,分流河道砂体的非均质性较弱,天然堤、决口扇和沼泽砂体的非均质性较强。综合分析认为,定边地区长2储层为中等非均质性储层。

Heterogeneity of Chang 2 reservoir in Dingbian area,Ordos Basin

Based on statistics of core and well log data,parameters of variation coefficient,dash coefficient and diffe-rential are calculated to carry out the study on the heterogeneity of layer,interlayer and areal heterogeneity of Chang 2 reservoir.The sand sets of Chang 2 reservoir are mainly of distributary channel sand bodiesin delta plain,and the layer heterogeneity is weak.There are many single sand bodies inside the reservoir,mud interbeds and barriers developed,and layer heterogeneity is relatively strong.In the plane,the reservoir heterogeneity in the distributary channel is weak and it is strong in the levee,crevasse splay and swamp.It is considered that Chang 2 reservoir in Dingbian area is of moderate heterogeneity.