安塞油田王窑地区长61^1储层物性研究

Study on physical property of Chang 61^1 reservoir in Wangyao area, Ansai Oilfield

利用铸体薄片、扫描电镜及压汞曲线等资料,系统地研究了安塞油田王窑地区长611储层的岩石学特征、孔隙类型、孔隙结构特征、物性特征及其影响因素,并指出了有利的勘探目标区。综合评价认为:研究区长611储层砂岩类型以长石砂岩为主,孔隙类型为原生粒间孔隙、溶蚀粒间孔隙、溶蚀粒内孔隙、微裂缝等,砂岩储层的铸体薄片面孔率为0.98%～1.37%,平均孔喉半径较小,为典型的中—低孔、低渗储层;影响储层物性的因素主要为沉积环境和成岩作用。

Based on cast thin section,scanning electronic microscope and mercury penetration curves,the petrological characteristics,pore type,pore texture characteristics,reservoir properties and influencing factors of Chang 61^1 reservoir are systematically studied,and the favorable exploration target areas are pointed out.Through the comprehensive evaluation,it is considered that arkose is the main sandstone type of Chang 61^1 reservoir,and the pore types include primary intergranular pore,dissolved intergranular pore,dissolved intragranular pore and micro-fracture.The plane porosity of cast thin section of the sandstone reservoir ranges between 0.98% and 1.37%,the average throat radius is low,and the reservoir is of typical middle-low porosity and low permeability.The main factors that influence the reservoir properties are sedimentary environment and diagenesis.