现代地质2017，Vol.31Issue(5)：1059-1068,1087,11.
柴西狮子沟地区古近系下干柴沟组混积岩储层特征及影响因素分析
Reservoir Characteristics of the Paleogene Mixed Carbonate-siliciclastic Rock or Succession and Its Influencing Factors in the Shizigou Area of the Western Qaidam Basin
摘要
Abstract
Western Qaidam Basin belongs to the sedimentary center of the saline lake basin in Qaidam Basin.Salinization stage of the western Qaidam Basin lasts for a long time,and the lake basin is widely distributed.Therefore the Oligocene lacustrine carbonate rock has great exploration potential.Based on core observation,rock slice identification,and the analysis of scanning electron microscope and electron spectrum of the samples of Shizigou area,the features of reservoir lithology,reservoir physical property and reservoir space are studied,and reservoir influential factors and forming mechanism are analyzed.The main conclusions are as follows.(1) The reservoir has characters of mixed deposit.The mineral composition is mainly carbonate and clastic grain,but neither of relative content is over 50％.The genetic type of mixed carbonate-siliciclastic rock or sucession is facies mixed.Fabric mixed is the main type,layer series mixed is the second type,and a few biological mixed type is found.The samples generally contain saline minerals.(2) The results of physical property analysis and X diffraction components testing show that the reservoir is super-low permeable and super-low porous,and its connectivity is poor.The content of carbonate rock composition is in the range of 10.9％ to 47.0％,with an average of 32.1％.At the same time,porosity and carbonate content have a good positive correlation.(3) The reservoir space of the samples is mainly saline mineral dissolved pore,dolomite intercrystal pore and fracture.(4) The diagenesis of the reservoir is mainly cementation and dolomitization.Especially the cementation of the saline minerals suppresses the later diagenesis,forming local high pressure.The important conditions of dolomitization are high carbonate content and saline environments.The compaction of reservoir is weak.The reservoir experiences two cementation periods.The saline minerals which cementated in the later period are the main dissolution parts.关键词
柴西狮子沟/盐类矿物/混积岩/储层影响因素Key words
Shizigou of the western Qaidam Basin/saline mineral/mixed carbonate-siliciclastic rock or succession/reservoir influencing factor分类
能源科技引用本文复制引用
张世铭,张小军,张婷静,王朴,南喜祥,苟迎春..柴西狮子沟地区古近系下干柴沟组混积岩储层特征及影响因素分析[J].现代地质,2017,31(5):1059-1068,1087,11.基金项目
国家科技重大专项(2016ZX05003-006) （2016ZX05003-006）
中国石油重大科技专项“柴达木盆地油气地质理论深化研究”(2016E-0101). （2016E-0101）
