鄂尔多斯盆地姬塬地区长6储层渗流特征

Characteristics of seepage of Chang 6 reservoir in Jiyuan area of Ordos Basin

对鄂尔多斯盆地姬塬地区长6储层特征、微观渗流特征及影响因素进行综合研究,为开发前期评价提供科学依据。以铸体薄片、扫描电镜等分析化验资料为基础,应用恒速压汞、核磁共振等储层评价新方法对岩石类型、孔隙结构进行分析。研究表明,该区长6储层物性较好,粒间孔发育,储层孔隙结构好,以小孔、微细喉为主,可动流体饱和度高,渗流能力强,有利于高效开发。储层孔隙结构、成岩相及储层润湿性是影响相渗特征的重要因素。

In this paper, the authors made a comprehensive study of reservoir characteristics, micro-flow characteristics and influenc-ing factors of Chang 6 reservoir in Jiyuan area of the Ordos Basin so as to provide a scientific basis for exploitation and evaluation atearly stages. New methods for reservoir evaluation were used to study the composition of the rocks and the pore structures which in-clude rate-controlled mercury penetration and nuclear magnetic resonance technique based on the data of the cast slice and SEM.The results show that the characteristics of Chang 6 reservoir are relatively ideal in that the reservoir develops intergranular pores, thereservoir pore structure is relatively good, being mainly small pores with microthroat, upper movable fluid has high saturation, and thepercolating capabilityis strong, thus favorable for efficient development. Reservoir pore structure, diagenetic facies and reservoir wetdegree are considered to be the important factors influencing effective permeability.