Albert湖盆中-高渗储层非均质性分析

乌干达Albert湖盆南区K油田为中-高渗类型储层,非均质性较强。主要运用37 m岩心及280样次的薄片、粒度、扫描电镜、X-衍射、压汞、以及物性等化验分析结果,对储层进行层内、层间及微观储层非均质性分析并研究其控制因素。研究发现,储层渗透率变异系数为0.83~1.81,非均质性强,黏土及多种碳酸盐成岩方式的差异和沉积颗粒粒级变化是储层非均质主要影响因素。据此,将K油田Zone1A、Zone1B及Zone1C层岩石类型主要划分为粗-中粒颗粒包壳式泥质胶结砂岩、细-中粒碳酸盐质孔隙式胶结砂岩及中-粗粒颗粒包壳式和孔隙式泥质胶结砂岩。

Analysis of medium to high permeability reservoir heterogeneity based on subdivided zone in Albert basin

K oilfield of southern Albert belongs to a medium to high permeability reservoir and has a strong heterogeneity.By mainly using 37 m cores and slice,granularity,scanning electron microscopy(sem),X-ray diffraction,mercury injection of 280 samples,as well as the testing results of physical properties,the heterogeneity analysis on reservoir layer,interlayer and the microcosmic reservoirs and its controlling factors have been carried out.The study found that the reservoir permeability variation coefficient is 0.83~1.81.The strong heterogeneity,clay and the difference between various types of carbonate rock,combined with the sedimentary particle grade change,are the main influencing factors of reservoir heterogeneity.On the basis of this,the rocks from Zone1 A,Zone1B and Zone1 C are mainly divided into coarse- grain of grain in the cladding type argillaceous cementation sandstone,fine- grain in carbonate cementation sandstone pore type and package- coarse particles of shell type and argillaceous cementation sandstone pore type.