【作者】 汪卫国； 赵应成；

【Author】 WANG Wei-guo;ZHAO Ying-cheng;Third Institute of Oceanography,State Ocean Administration;Northwest Branch,Research Institute of Petroleum Exploration & Development;

【机构】 国家海洋局第三海洋研究所； 中石油勘探开发研究院西北分院；

【摘要】 目的对冷湖四号油田进行储层评价,了解该地区下第三系砂体的分布及控制因素。方法通过岩心观测,录井、测井及地震资料解释,沉积物粒度分析等方法,对柴达木盆地冷湖四号及其周边地区下第三系沉积相及其展布进行了研究。结果共识别出3种沉积相、5种亚相、13种微相。结论不同时段沉积相展布显示:老第三纪,冷湖四号地区为洪泛平原,其上发育辫状河道、泛滥平原和泛滥盆地,辫状河道主要为砾质或砂砾质心滩组成,呈南北向展布,但不同时段,河道东西向摆动。河道两侧发育细粒的(砂质或泥质)泛滥平原或泛滥盆地沉积。更多还原

【Abstract】 Aim In order to evaluate the reservoir in Lenghu 4^th area,sand distributions and the controlling mechanism were studied firstly.Methods Based on core observing,analyses of drilling,logging,grain size and seismic data,a systematic analysis has been conducted to investigate the sedimentary facies of Paleogene strata in Lenghu4^th tectonic and around areas.Results 3 facies,5 subfacies and 13 microfacies are distinguished in those areas.Conclusion Focused on Lenghu 4^th tectonic area,the sedimentary facies there in Paleogene are fluvial plains which consist of braided channel,flood plain and flood basin subfacies.The braided channels,composed of coarse sand stone or fine conglomerate,laid in approximately north-south direction and swung in east-west direction in Paleogene.The flood plain and flood basin,composed mainly of silt stone and mud stone,were located to the both side of braided channels.更多还原