多孔介质储层表征技术在塔中地区上奥陶统礁滩储层中的应用

摘要

The characterization technique of porous media reservoir is an analysis technique for characterizing the reservoir spaces of various sizes and their combination types,using core analysis,logging analysis,seismic analysis,experimental analysis of core samples,production performance analysis and other analysis techniques,and finally evaluating favorable reservoirs.Using this technique,5 kinds of combination types of the Upper Ordovician of Lianglitage Formation in Tazhong Area,including pore reservoir,vug reservoir,pore-vug reservoir,fracture-cave reservoir and pore-vug-fracture-cave reservoir,are identified.And the pore throat structure,physical property and production performance of various reserviors are characterized.The results show that the pore throat structure of pore-vug reservoir is macroporous and large throat,and is better than pore reservoir and rug reservoir.And fracture makes an improving effect on all 5 reservoirs,which increase the physical property and connectivity.The production performance is affected by different reservoir type.The production performance of pore-vug-fracture-cave type and pore-vug type reservoirs is high and stable,and that of fracture-cave type reser voir is medium and relatively stable,and that of vug type reservoir in the inner platform is relatively low.Thepore-vug-fracture-cave type and pore-vug type reservoirs in the platform margin are the favorable reservoir,and the fracture-cave type reservoirs in the inner platform is the main type of exploration target at present,and the pore type and the vug type reservoirs in the inner platform have also a certain exploration value if they develop fractures.%多孔介质储层表征技术应用岩心分析、测井分析、地震分析、岩样实验分析、生产动态分析等多种分析方法,表征不同尺度储集空间及其组合特征,最终评价有利储层.应用该技术,识别塔中地区北斜坡奥陶系良里塔格组孔隙型、孔洞型、孔隙-孔洞型、缝洞型和孔缝洞型5类储层,并表征了各类储层的孔喉结构、孔渗性和产能特征.结果表明:孔隙-孔洞型储层的孔喉结构发育大孔大喉的孔喉结构,优于孔隙型和孔洞型储层;裂缝对各类储层起到改善作用,裂缝的发育增加了储层孔渗性和连通性;储层产能特征受储层类型及规模影响,台缘孔缝洞型、孔隙-孔洞型储层以高产稳产为特征,台内缝洞型储层以中产较稳产为特征,台内孔洞型储层以中低产不稳产为特征.各类储集空间组合类型中,台缘孔缝洞型、孔隙-孑孔洞型储层是最有利储层,台内缝洞型是目前台内勘探的主要类型,台内孔隙型、孔洞型储层在裂缝发育情况下可以形成潜力储层.