塔里木盆地中寒武统沙依里克组岩相古地理特征  

Lithofacies paleogeographic characteristics of the Middle Cambrian Shayilike Formation,Tarim Basin,NW China

作　　者：孙学虎 王琳霖 吕奇奇[1] 刘玲利 李琳静 张建坤 SUN Xuehu;Wang Linin;LÜQiqi;LIU Lingi;LI Linjing;ZHANG Jiankun(School of Geosciences,Yangtze University,Wuhan 430100,China;Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083,China;Hangzhou Institute of Geology,PetroChina Co.,Ltd.,Hangzhou 310023,China;Hubei Geological Survey,Wuhan 430034,China;East China University of Technology,Nanchang 330013,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国石化石油勘探开发研究院,北京100083 [3]中国石油杭州地质研究院,浙江杭州310023 [4]湖北省地质调查院,湖北武汉430034 [5]东华理工大学,江西南昌330013

出　　处：《沉积与特提斯地质》2024年第1期45-57,共13页Sedimentary Geology and Tethyan Geology

基　　金：国家自然科学基金(42102170)。

摘　　要：沙依里克组是塔里木盆地寒武系油气勘探中的重要层位,沉积相的精细刻画依然是目前制约该层位油气勘探取得突破的关键因素。本次研究在大量岩心观察、230块岩石薄片鉴定分析的基础上,总结了研究区内10种典型的岩相组合类型,并识别4种典型地震相带特征,进而分析了沙依里克组发育的沉积相类型及其分布特征。结果表明:(1)塔里木盆地中寒武统沙依里克组发育蒸发台地、局限台地、开阔台地、台地边缘、斜坡相及盆地相6种沉积相,进一步可划分为7种亚相及15种微相;(2)结合地层厚度展布、地震资料,编制了中寒武统沙依里克组岩相古地理图,建立了碳酸盐岩台地到斜坡–盆地的沉积相模式。对沙依里克组岩相古地理的深入研究,可进一步明确蒸发岩类盖层与盐间白云岩储层之间的良好配置关系,为盐间勘探领域新突破提供理论支撑。The Shayilike Formation is an important horizon in Cambrian oil and gas exploration in the Tarim Basin,where and the fine-scale delineation of sedimentary facies remains the key factor restricting the breakthrough of oil and gas exploration in this horizon.Based on a large number of core observations and petrography on 230 thin sections,this study has summarized 10 typical lithofacies assemblages in the study area and identified 4 typical seismic facies zone characteristics.Furthermore,the sedimentary facies types and distribution characteristics of the Shayilike Formation were analyzed.The results show that:(1)the Shayilike Formation of middle Cambrian age in the Tarim Basin consists of 6 sedimentary facies,including evaporative platform,limited platform,open platform,platform margin and slope-basin facies,which can be further divided into 7 subfacies and 15 microfacies.(2)Combined with stratigraphic thickness distribution and seismic data,the lithofacies paleogeography map of the Middle Cambrian Shayilike Formation was compiled,and the sedimentary facies model from carbonate platform to slope basin was established.Further study of the lithofacies paleogeography of the Shayilike Formation can clarify the relationship between evaporite cap rocks and intersalt dolomite reservoirs and provide theoretical support for further breakthroughs in the field of intersalt exploration.

关 键 词：岩相古地理 岩相组合 沙依里克组 中寒武统 塔里木盆地 

分 类 号：P534.41[天文地球—古生物学与地层学]