摘要
针对鄂尔多斯盆地马岭地区长81储层微观孔隙结构复杂、非均质性强等问题。利用铸体薄片、扫描电镜、物性分析和恒速压汞等测试化验资料,深入研究了鄂尔多斯盆地马岭地区长81储层的微观孔隙结构特征。结果发现:马岭地区长81储层微观孔隙结构类型复杂,储层属于大-中孔、微喉、超低-特低渗储层,其中尤以粒间孔和长石溶孔为主要储集空间,孔喉分选性及连通性一般。比较物性不同的岩样,渗透率越小的岩心,喉道分布越集中,所对应的喉道半径数值分布范围就越窄,孔喉结构分选性越好。随着渗透率的增大,大吼道分布逐渐增多,所对应的喉道半径数值分布范围越宽,孔喉结构分选性越差。研究区储层孔隙结构内的喉道是决定储层物性的关键因素。
Chang 81reservoir in Malingarea features complex micro-pore structure,strong heterogeneity. The microscopic porestructure of Chang 81reservoir in Maling area is researched in this paper by use of casting thin section,scanning electron microscope,physical property analysis and constant mercury injection. The result show that the microscopic pore structure types of Chang81reservoir are complex,which belongs to large-middle pore with micro throat,ultra-low permeability reservoir. The reservoirspace is mainly inter-granular pore and feldspar dissolved hole. The pore and throat have general sorting and communication. Itindicates that the smaller permeability of core represents the more centralized throat distribution by comparison of different samples,and the corresponding numerical range of throat radius is more narrow and pore throat structure sorting better. With the increase ofpermeability,the distribution of the large throat rises,and numerical range of throat radius is wider,and the pore throat structure isless. In conclusion,the throat is the key factor to determine the reservoir physical properties.
作者
刘翰林
Liu Hanlin(School of Earth Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《石化技术》
CAS
2016年第1期207-210,共4页
Petrochemical Industry Technology
关键词
微观孔隙结构
恒速压汞
长81砂岩储层
马岭地区
micro-pore structure
constant velocity mercury penetration
Chang 81 reservoir
Maling area
