RESERVOIR CHARACTERISTICS AND COMPREHENSIVE EVALUATION OF NANBAXIAN OILFIELD IN NORTH MARGIN OF THE QAIDAM BASIN
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摘要: 柴北缘南八仙油田有近50年的开发历史,储层的综合评价对于剩余油的挖潜具有重要的意义。南八仙油田第三系储层岩石类型以长石砂岩和岩屑长石砂岩为主,碎屑成分中杂基、胶结物含量较高;孔隙类型主要为原生孔隙和次生溶孔,分选较好;储层成岩作用相对较弱,碳酸盐析出是减少原生孔隙的重要因素;孔隙类型以粒间孔为主,喉道以弯片状—片状组合类型为主。储层物性为中孔—中渗类型,连通性较好;成岩相主要为早成岩B期,有利于次生溶孔的发育。应用聚类分析方法对储层综合评价表明,南八仙油田内Ⅲ类储层所占比例最大,其次为Ⅱ类储层,Ⅰ类储层比例相对较小。Abstract: Reservoir comprehensive evaluation has great meaning for residual oil development in Nanba-xian Oilfield,locating in north margin of the Qaidam Basin,which has been developed for more than 50 years.Feldspar sandstone and debris-arkosic sandstone are the main rock types of the Tertiary reservoir sandstone with high matrix and cement content in detritus in Nanbaxian Oilfield.Well sorted original pore and secondary dissolved pore are the main pore types.Reservoir diagenesis is relatively weak.The separate out of carbonate is the main factor for original pore decrease.Intergranular porosity is the main pore type,which is connected by bend sheet-sheet shape pore throat.The reservoir has middle porosity-middle permeability and well connectivity.Diagenetic facies is early B period,which is favorable for the development of secondary dissolved pores.Comprehensive reservoir analysis by cluster analysis method showed that reservoir type in Nanbaxian Oilfield was mainly type Ⅲ,the next was typeⅡ,while typeⅠ was relatively small.
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Key words:
- cluster analysis /
- pore structure /
- diagenesis /
- reservoir characteristic /
- Nanbaxian Oilfield /
- Qaidam Basin
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