柴西北小梁山地区狮子沟组混积岩储层评价

从有利于混积岩储层评价出发，将小梁山狮子沟组(N³₂)混积岩简化归类为泥质混积岩、砂质混积岩和碳酸盐混积岩，在此基础上根据铸体薄片、物性、孔隙结构等岩心分析数据和测井资料，对柴达木盆地西北部小梁山地区中浅层N³₂混积岩进行综合研究：N³₂混积岩岩石结构复杂、类型多样，储层储集空间以原生的粒间孔和微孔隙为主，呈中高孔低渗的特征，排驱压力、中值压力较高，孔喉半径较小，孔隙结构较差；储层质量受沉积相和成岩作用的综合影响，砂坪微相是最主要的有利储集相带，压实作用是储层物性的主要影响因素；根据物性和压汞等参数将N32储层评价为3类，其中Ⅰ、Ⅱ类储层在目前的技术条件下是研究区增储上产的首选储层。

Reservoir Evaluation on Mixing Deposit of Shizigou Formation in Xiaoliangshan,Northwest of Qaidam Basin

The mixing deposit of N³₂ in Xiaoliangshan region is simply classed as argillaceous mixing deposit, arenaceous mixing deposit and carbonate mixing deposit for reservoir evaluation. On this basis，combining the data of core analysis，the casting thin sections, porosity and permeability analysis, mercury injection test and log, this paper investigates the mixing deposit reservoir of Shizigou Formation in Xiaoliangshan, northwest of Qaidam Basin: The mixing deposit has complex rock structure and various rock type. The pore space of reservoir mainly includes the primary intergranular pores and micropores. The reservoir properties are mainly medium high porosity and low permeability, high displacement and saturation median point pressure, small pore throat radius. The pore structure are generally poor. The sedimentation and diagenesis have played important roles in evolution of resevoir. The sand flat microfacies is the main favorable reservoir facies. Compaction is the major factor that has influence on the reservoir physical property.N³₂are divided into three types according to parameters like physical property, capillary pressure and so on, reservoirs of the typeⅠand type Ⅱ can be taken as the major target zones for increasing reserves.