安哥拉深水沉积贯入砂岩的识别特征及成因模式  

Deep-Water Sedimentary Sandstone Injectite Identification and Its Genetic Model in Angola

作　　者：张文彪[1] 段太忠[1] 张旭彪 刘志强[1] 杨志成 徐睿[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中铁电气化局集团有限公司,北京100036 [3]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《地质科技情报》2017年第2期97-104,共8页Geological Science and Technology Information

基　　金：中石化科技部攻关项目(G5800-15-ZS-KJB016);国家科技重大专项(2016ZX05033-003-002)

摘　　要：在安哥拉深水沉积的研究中发现了贯入砂岩存在的现象,国内外对此报道较少,且在实际勘探开发中关注度不够。基于野外地质露头、岩心、测井及地震资料综合分析,系统研究了贯入砂岩的识别特征,探讨了其形成原因并总结了其发育模式。研究结果表明:贯入砂岩的整体几何形态呈极度不规则状;岩心中常见的构造主要有不同规模的撕裂状泥岩碎屑、砂岩变形褶皱与不规则充填、岩石矿物颗粒定向排列、储层物性较母岩物性变差等;贯入砂岩的自然伽马及声波值有增高趋势,且齿化严重,地震反射呈混杂的不连续性特征;该区贯入砂岩包括水道砂体翼部贯入和顶部贯入2种类型,且形成过程受差异压实与断裂活动共同控制。本研究可以深化被动陆缘盆地深水沉积的认识,同时也为下一步指导精细勘探和开发生产提供一些新思路。Injectite sandstone is observed in deep water sedimentary strata in Angola, which is far from suf- ficient attention in both actual explorations and researches. This article systematically studies injectite sandstone recognition features based on combination analysis of core, outcrop, logging and seismic data, and summarizes its formation and development model. The results indicate that the injectite sandstone morphology was generally in utmost irregular shape and that the core architecture includes tear mudstone debris of different scale, sandstone fold deformation and irregular filling, mineral grains in the rock to di- rectionally arranged, degraded physical properties of reservoir comparing to parent rock. Also, a trend of increasing value of GR and acoustic wave for injectite sandstone shows mixed discontinuity characteristics, This study area comprises two injectite sandstone types, known as channel sand wing intrusion and top in- trusion respectively, jointly controlled by differential compaction through their formation process. This study furthers the understanding of deep water sedimentary rocks in passive continental basin as well as provides new ideas for the next-step precise exploration and production.

关 键 词：贯入砂岩 深水沉积 浊积砂岩 成因模式 地震液化 

分 类 号：P512.32[天文地球—地质学]