摘要
储层微观孔隙结构是油田下步勘探开发工作的重要参考因素。应用铸体薄片、x衍射、扫描电镜、压汞等实验分析手段,深入研究了吴起油田油沟油区长4+5储层微观孔隙结构特征。资料显示,该储层属低孔、特低-超低渗储层,孔隙类型以残余粒间孔和长石溶孔为主,属中孔、微细吼道类型,孔喉分选性好,连通性一般。根据岩心喉道分布及渗透率贡献率分布特征,可以看出进汞量与渗透率贡献值并不匹配:进汞量分布的喉道范围比渗透率贡献分布的喉道范围更宽,渗透率贡献的孔喉半径分布更偏向粗吼道一端。大孔喉对储层渗流能力的贡献更大,中、小孔喉则对储层渗流能力的贡献较小。研究表明,储层物性与分选系数、中值压力、中值半径、最大吼道半径等参数相关性较好,受孔隙结构特征多参数综合影响。
Microscopic pore structure of reservoir is an important factor for the development of oil field exploration and development. By thin section analysis, X-ray diffraction, SEM and mercury injection methods, the microscopic pore structure characteristics of Chang4＋5 reservoir in Wuqi Oilfield are in-depth studied. Data show that the reservoir is low porosity and ultra-low permeability reservoir, and the pore types are mainly residual intergranular pore and feldspar dissolved pores. The pore and throat have good sorting and general communication, belonging to the middle hole, micro channel type. According to the distribution characteristics of core throat and permeability, it can be seen that the contribution of the amount of mercury and the permeability is not matching. The distribution of mercury in the throat area is wider than that of the permeability contribution. The pore throat radius distribution of permeability contribution is more inclined to the end of the coarse roar. The contribution of the large pore throat to the reservoir flow capacity is greater, and the small hole throat has a little contribution to the reservoir seepage ability. The research shows that the parameters of reservoir property and sorting coefficient, median pressure, median radius and maximum throat radius are good correlation. The reservoir properties are influenced by the multiple parameters of the pore structure characteristics.
出处
《广东化工》
CAS
2016年第5期58-61,57,共5页
Guangdong Chemical Industry
关键词
鄂尔多斯盆地
长4+5油层组
微观孔隙结构
孔喉特征参数
Ordos Basin
Chang4＋5 resetvoir
microscopic pore structure
characteristic parameters of pore throat
