靖边油田长6油层组储层特征及物性影响因素

通过大量岩心铸体薄片、黏土矿物X衍射、扫描电镜及物性等资料分析,总结研究了靖边油田长6油层组的储层特征及影响因素。结果表明:长6储层具有成分成熟度低、结构成熟度高的岩石学特点。孔隙类型为浊沸石溶孔-长石溶孔-残余粒间孔组合,物性特征为中孔、特低渗透型和超低渗透型为主,局部为低渗透型。孔隙结构为细孔-微孔、细喉-微细喉型。影响储集性能的因素主要表现为两方面:平面上受三角洲平原亚相沉积相带的控制;纵向上受成岩作用的影响。

Reservoirs Characteristics and Influence Factors of Chang 6 Oil-Bearing Group in Jingbian Oilfield

The characteristics and influence factors of Chang 6 Formation reservoirs in the Jingbian Oilfield are studied based on the data of drilling cores,costing thin sections,X-ray diffraction of clay,SEM （scanning electron microscopy）,as well as physical property in the area.The result shows that it has the petrological characteristics of lower mineral and high structure maturity.Its pore types are combinations of laumontite dissolution pores-feldspar dissolution pores-primary intergranular pores.The physical property represents that Chang 6 reservoirs are of medium-porosity extra-low to ultra-low permeability,locally of low permeability.The pore texture types are fine to micro pore with fine to micro-fine throat.The main factors affecting reservoir property are the distribution of delta plain facies in the plane and diagenesis in the vertical.