靖边油田延长组长2油层组储层特征及影响因素

Reservoirs characteristics and influence factors of Yanchang Formation Chang 2 oil layer in Jingbian oilfield

通过大量岩心铸体薄片、粘土矿物X衍射、扫描电镜及物性等资料分析,研究总结了靖边油田长2油层组的储层特征及影响因素。得出结论:辫状河、曲流河亚相沉积的长2油层组储集层具有成分成熟度低、结构成熟度高的岩石学特点。孔隙类型为长石溶孔-原生粒间孔组合;物性特点为中孔、中—高渗透型,部分地区为低渗透型;孔隙结构为大孔—中孔细喉型。影响储集性能的因素主要表现为两方面:储集性在平面上的分布主要受沉积相带的控制;纵向上的分布主要受成岩作用的影响。

The authors studied the characteristics and influential factors of Chang 2 Formation reservoir in Jingbian oilfield through data of drilling cores,thin sections of the castings,X-ray diffraction of clay,scanning electron microscopy,as well as physical property in the study area.It was concluded that Chang 2 reservoir was characteristic of lower mineral maturity and high structure maturity and was of the porosity type composition of feldspar dissolution porosity and primal particle porosity and the physical properties represented that Chang 2 was middle porous,medium-high permeable,and in some areas low permeable type.The structure of porosity was big-medium,fine pore throat structure,and the impact of reservoir properties of the main factors lay in the two aspects： the quality of reservoir distribution was mainly affected in the plane by the control of sedimentary facies,and the vertical by the effects of diagenesis.