摘要
根据实验分析,结合录井、试采等成果,对顺宁油田长21低渗透砂岩储层特征等进行分析研究和综合评价,认为:长21储层孔渗分布特征属于以中孔特低渗-低渗型为主的储层,微观结构以中-大孔隙、细到中-粗喉道组合为主,孔喉结构特征对储层渗透性有决定性影响,储层渗流能力主要由较大的孔喉提供;长21储层可以划分为Ⅰ,Ⅱ,Ⅲ,Ⅳ4大类型及相应的A,B亚类;综合评价长21储层属于以Ⅰ,Ⅱ两种类型为主要构成的低渗-特低渗透储层,其中A亚类储层的孔喉结构优于B亚类,渗流能力也将好于B亚类,然而分流河道及其旋回沉积的不同部位控制了储层类型的发育状况。
Based on experimental analysis,combined with feedbacks of well logging and test production,analytical study and overall evaluation of Chang2^1 low permeability sandstone is carried out. The porosity and permeability distributional characteristics of Chang 2^1 reservoirs show that the reservoir beds are mainly composed of middle-porosity and special low permeability type. Its microscopic textures are mainly of assemblage of mid-macropore,fine to mid-coarse throat and the pore throat feature has crucial influence on reservoir is permeability,and the filtration capability of reservoir provided by major pore throat. Chang 2^1 reservoir beds may be divided into four major type of Ⅰ , Ⅱ , Ⅲ , Ⅳ and into two subtypes of A and B. Chang 2^1 reservoir beds belong to low-special low permeability type mainly composed of type Ⅰ and Ⅱ two. Of the subtypes,pore-throat microstructure of subtype A is better than those of subtype B. It is found that the different parts of distributary channel and cyelotheric sedimentation controls the development regime of reservoir bed types.
出处
《矿物岩石》
CAS
CSCD
北大核心
2006年第4期89-94,共6页
Mineralogy and Petrology
关键词
长2^1储层
低渗透
综合分类评价
Chang 2^1 reservoir bed
low permeability
synthetical assortment evaluation
