王家湾区长2油层组微观孔隙结构特征研究

孔隙研究是储层研究的核心,对油气的聚集和运移具有至关重要的作用。研究区长2储层内有效孔隙发育较差,属低孔低渗型致密储集层。在大量岩心常规薄片、铸体薄片、扫描电镜、高压压汞技术等资料统计分析的基础上,对鄂尔多斯盆地王家湾区长2储层孔隙结构特征进行研究。研究表明,研究区储层孔隙喉道类型多样是其渗透性差的主要原因,储层以残余粒间孔和溶蚀粒间孔为主。划分出了四类孔喉结构,其中前三种为研究区有效储层,后一种为非有效储层。

Research of micro-pore structure characteristic of Chang2 reservoir in Wangjiawan area

Pore research is the kernel of the reservoir study,it plays a crucial role in studying oil and gas accumulation and migration.In Reservoir Chang2,the effective pore development is poor,it is a dense low reservoir with porosity and low permeability.Based on cast slice,thin sections,scanning electron microscopy and technology of High pressure Hg injection and physical property analysis etc.data,the pore structure characteristic of Chang2 oil layer in Wangjiawan,Ordos basin area were studied.The research shows the varieties of pores and throats are the main reasons that the permeability is low,and the primary pore and dissolved pore are main pores.The pore-throat structure can be divided into four types,the first three types are effective reservoir and the last is unavailable reservoir.