鄂尔多斯盆地富县地区长8油层组储层特征及控制因素研究

鄂尔多斯盆地延长组下组合目前已经成为石油勘探开发的重点区域,富县地区油藏类型主要以构造-岩性油藏为主。基于研究区长8油层组露头、岩心观察、铸体薄片、压汞等资料,同时结合测井资料等,对研究区长8油层组的储层岩石学特征、物性特征及孔隙结构特征等进行分析,结果表明,长8油层组岩石类型以长石砂岩为主,储集孔隙结构类型主要为粒间孔,长石溶孔次之,孔喉结构特征以微孔喉类型为主,储集层物性较差,属于特低孔、超低渗致密储层;储层物性特征主要受沉积及成岩作用双重因素控制。

Reservoir characteristics and its controlling factors analysis of Chang-8 oil reservoirs in Fuxian area,Ordors basin

At present the lower Yanchang formation of Ordos basin has become the key area for petroleum exploration and development.In Fuxian area,the oil reservoir types are mainly of structure-lithology type.Based on the outcrop,core observation,casting thin sections,mercury injection,etc,of Chang-8 reservoir in the research area,and in combination with logging data,the research on reservoir petrology features,physical properties and pore structure characteristics have been analyzed.The study results show Chang-8reservoir types are mainly of feldspar sandstone,the reservoir pore structure types are mainly intergranular pores,feldspar dissolved pore comes the second.The pore throat structure characteristics is given priority to micro pore throat types,the reservoir physical property is poor.Therefore,it belongs to low porosity,low permeability reservoir.Reservoir physical properties are characterized by the dual factors of diagenesis and sedimentation.