吴旗油田长6_1储层沉积相及孔隙特征研究

Study on the Microfacies and Pore Character of Chang 61 Reservoir of Wu 420 Well Region in the Wuqi Oilfield

运用综合地质研究方法,以岩性特征、沉积构造、古生物化石等沉积相识别标志为依据,识别出吴旗油田长61储层沉积微相类型为水下分流河道、河口坝、远砂坝、分流间4种沉积微相类型。根据岩心观察、铸体薄片分析资料,研究了长61储层的孔隙特征。研究区储层孔隙类型以粒间孔为主,占3.27%,长石溶孔和岩屑溶孔次之。通过对孔隙特征及沉积微相关系研究表明,水下分流河道砂体沉积厚度较大,粒度相对较粗,云母等片状硅酸盐矿物含量相对较少,其孔隙度、渗透率相对较高,河口坝、远砂坝次之,分流间最差。

According to the identification mark such as the lithology, sedimentary structures and fossils, the identification Chang 61 reservoir microfacies types applied to the comprehensive geological research methods is dis- cussed. The Chang 61 reservoir microfacies types are distributary channel sand bodies, river mouth bars, distal bar and distributary interchannel. The planar distribution characteristics of the Chang 61 reservoir microfacies combined the geomorphological features and sedimentary of Yanchang Formation in Ordos Basin is studied on . According cores and the data of thin sections, the pore characteristics of the Chang 6t reservoir is also studied on. The types are intergranular pore, feldspar dissolution pore and cuttings dissolution pore. The intergranular pore is main ac- counting for 3.27%. As a result, distributary channel sand bodies are best reservoir, followed by river mouth bars, distal bar and distributary interchannel. Distributary channel sand bodies are thicker sedimentary thickness, coarse grain, high porosity, high permeability and small other sheet silicate minerals.