关键词: 裂缝-孔隙型储层, 基块岩石电阻率, 基块声波时差, 裂缝识别, 裂缝孔隙度, 裂缝渗透率

Abstract: The reservoir of KT-Ⅱmember of Carboniferous in K oilfield of Kazakhstan is a limestone reservoir with medium low porosity and ultra-low permeability in open platform facies. Fractures are very important to improve the seepage capacity of the reservoir. The methods of using conventional logging data to evaluate fractures in carbonate reservoir studied by predecessors is of poor certainty and easy to be influenced by many factors such as fracture occurrence,saturation and mud invasion depth. Based on the limited coring and electrical imaging logging data of the target interval in the study area,combined with the study of logging response characteristics of pore reservoir and fracture-pore reservoir,a method was proposed to determine the resistivity of base block rock and acoustic time difference of base block by using compensated neutron logging. By comparing the difference characteristics of these two parameters with deep lateral resistivity and acoustic time difference respectively,fracture development sections with different occurrence in reservoirs were comprehensively identified,then the logging interpretation models of fracture porosity,secondary porosity,fracture permeability,total permeability were established,realizing and the fracture identification and parameter quantitative evaluation of carbonate reservoir by using conventional logging data. The comprehensive evaluation results of logging applied by this method can better match the coring physical property analysis and production performance,which provides a basis for reasonable and efficient development of this kind of reservoir.

Key words: fracture-pore reservoir, rock resistivity of base block, acoustic time difference of base block, fracture identification, fracture porosity, fracture permeability