薛岔油田延长组储层特征研究

薛岔油田延长组属于三角洲沉积体系,主要储集体为三角洲前缘砂坝和水下分流河道砂体.根据常规薄片、铸体薄片、扫描电镜、X射线衍射和压汞资料研究表明:该区储层岩石类型主要是灰绿色细粒岩屑长石砂岩,胶结类型以薄膜-孔隙型为主,主要填隙物成分为黏土、方解石;储层孔隙类型主要为粒间溶孔,孔隙结构属于小孔细喉型;该区平均孔隙度12%,平均渗透率0.67×10-3μm2,属于低孔、低渗储层;储层性质主要受沉积相带及储层物性的控制,属于典型的岩性油藏.

Study on reservoir characteristics of Yanchang Formation in Xuecha Oilfield

Yanchang Formation in Xuecha Oilfield is a delta depositional system.It mainly consists of delta front sand bar and subaqueous distributary channel sandbodies.According to conventional thin section,chlorite thin section,SEM observation,X-ray analysis of clay mineral and mercury injection data,it is held that the lithology of the reservoir is gray-green fine grained debris-feldspar,cementation type is mainly film-pore structure,the interstitial material of the is mainly clay and calcite.The intergranular dissolution pore is the main reservoir pore space,and its pore structure is small pore throat.The reservoir is typical low porosity and low permeability reservoir,its average porosity is 12%,and average permeability is 0.67×10-3 μm2.The reservoir property is controlled mainly by sedimentary microfacies and physical properties,and it is a typical lithologic reservoir.