塔里木盆地西北缘中下奥陶统碳酸盐岩沉积微相特征及演化  

Carbonate sedimentary microfacies characteristic and evolution of the Middle and Lower Ordovician in northwestern of Tarim Basin

作　　者：王清龙 林畅松[2] 李浩[2] 韩剑发[3] 孙彦达 何海全 Wang Qing-long;Lin Chang-song;Li Hao;Han Jian-fa;Sun Yan-da;He Hai-quan(Exploration and Development Research Institute,Geo-jade Petroleum Corporation,Beijing 100016,China;School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;Petroleum Exploration ＆ Production Institute,China National Petroleum Corporation,Korla 841000,China)

机构地区：[1]洲际油气股份有限公司勘探开发研究院,北京100016 [2]中国地质大学(北京)海洋学院,北京100083 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《天然气地球科学》2018年第9期1274-1288,共15页Natural Gas Geoscience

基　　金：国家重点基础研究发展计划(973)项目(编号:2011CB201100-03);国家自然科学基金重点项目(编号:41130422)联合资助

摘　　要：经过对塔里木盆地西北缘巴楚大阪塔格、巴楚达吾孜塔格和柯坪水泥厂等3条野外露头剖面实地考察,获得大量手标本及镜下薄片资料,在此基础上,围绕中—下奥陶统鹰山组至一间房组沉积微相特征及演化开展精细研究。结合手标本宏观沉积结构及镜下微观特征描述,分别识别出11种灰岩沉积微相类型和6种白云岩沉积微相类型。不同沉积微相以特定的相序组合成中高能厚层台缘浅水生物礁、潮坪内碎屑滩、开阔台地粒屑浅滩,中—低能局限台地滩后砂屑滩—滩间海薄互层、开阔台地生屑滩,低能薄层台内滩间海及干旱—半干旱局限台地中厚层云坪等7种主要的微相组合,反映出特定的沉积环境和生物建造特征,指示了研究区中—下奥陶统整体由干旱—半干旱局限台地、云坪向开阔台地及台地边缘转化,据此归纳出一间房组台缘高能礁滩相沉积、鹰二段台内内碎屑滩沉积和鹰三段、鹰四段云坪沉积等3套有利储集相带为下步勘探优先攻关方向。The carbonate sedimentary microfacies characteristic and evolution model of the Middle and Lower Ordovician have been established through the field work of Bachudabantage,Bachudawuzitage,Kepingshuinichang outcrop as well as abundant hand specimen and slice observation in the northwestern of Tarim Basin.Based on macro sedimentary structure and micro characteristics,11 kinds of limestone microfacies and 6 kinds of dolomite microfacies have been identified.Different microfacies were combined into 7 kinds of microfacies combination with particular facies sequence to reflect the specific sedimentary environment and reef building characteristic,which contains high energy thick-bedded platform edge shallow reef,tidal flat intraclast beach,open platform intraclast shoal,moderate-low energy thin-interbedded intraclast beach and interbank sea,open platform bioclastic beach,low energy thin-bedded interbank sea,arid and semi-arid climate thick bedded restricted platform dolomite tidal sequence.The study area mainly changes from restricted platform,dolomite tidal to open platform and platform margin with large set of shoal and reef development.Based on the discussion above,platform margin reef and shoal,inner shoal and dolomitic flat are the favorable reservoir facies belts to breakthrough in priority.

关 键 词：塔里木盆地西北缘 中下奥陶统 碳酸盐岩 微相类型及组合 沉积特征与演化 

分 类 号：TE122.2[石油与天然气工程—油气勘探]