鄂尔多斯盆地郑庄油区长6储层孔隙结构特征及影响因素

Pore Structure and Influence Factors of the Chang 6 Reservoir in the Zhengzhuang Oilfield,Ordos Basin

采用铸体薄片、扫描电镜,高压压汞等多种技术手段,对鄂尔多斯盆地郑庄油区长6储层的孔隙结构进行了分析和研究。该储层具有低孔、特低孔-特低渗的特征,以剩余原生粒间孔和次生孔隙为主,长石、岩屑及浊沸石胶结物的溶解是形成次生孔隙的主要原因。中孔和小孔是油气的主要储集空间,细喉、微细喉、微喉是长6的基本渗流通道。铸体薄片、扫描电镜观察表明郑庄长6储层具有复杂的孔喉分布特征,沉积作用和成岩作用是影响孔隙结构的主要因素,其中胶结作用和溶解作用的影响最大。

The pore structure of the Chang 6 reservoir in the Zhengzhuang Oilfield,Ordos basin is studied by means of SEM and casting thin sections.The reservoir is characterized by low porosity consisting mainly of primary remnant intergranular pores and secondary solution pores,and very low permeability.Medium and small pores are main reservoir space.Fine throat,tiny throat and mini throat are basic percolating channel.The pore structure is controlled by sedimentation and diagenesis,specially,cementation and solution.