塔里木盆地轮南地区三叠系层序格架内沉积相分布及演化规律  

Distribution and evolution laws of sedimentary facies in Triassic sequence framework of Lunnan area in Tarim Basin

作　　者：高登宽 易珍丽[1] 王铸坤 胡忠贵[2,3] 石放 刘柳[1] 李斌[1] 杨孔航 李建浪 GAO Dengkuan;YI Zhenli;WANG Zhukun;HU Zhonggui;SHI Fang;LIU Liu;LI Bin;YANG Konghang;LI Jianlang(Exploration and Development Research Institute of PetroChina Tarim Oilfield Company,Korla 841000,China;School of Geosciences,Yangtze University,Wuhan 430100,China;Sedimentary Basin Research Center,Yangtze University,Wuhan 430100,China)

机构地区：[1]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [2]长江大学地球科学学院,湖北武汉430100 [3]长江大学沉积盆地研究中心,湖北武汉430100

出　　处：《大庆石油地质与开发》2024年第6期49-60,共12页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“轮南地区三叠系—侏罗系沉积储层研究与滚动目标评价”(041021090103)。

摘　　要：塔里木盆地轮南地区在三叠系碎屑岩基础地质研究方面缺乏系统性认识,存在砂体分布规律认识不清等问题,制约了该区的深化勘探,特别是对潜在岩性油气藏的勘探,开展系统的沉积相研究显得尤为重要。充分利用岩心、测录井、地震资料等,对该区的层序地层重新进行了厘定,落实了层序格架内沉积相分布及演化规律。结果表明:三叠系划分为SQ1、SQ2、SQ3和SQ4共4个三级层序;在沉积相识别标志研究的基础上,确定该区主要发育辫状河三角洲相、曲流河三角洲相和湖泊相;SQ1沉积时期发育以泥岩为主的滨浅湖亚相,SQ2沉积时期发育辫状河三角洲前缘亚相,SQ3沉积时期发育曲流河三角洲前缘亚相,SQ4‑TST(湖侵体系域)沉积时期发育辫状河三角洲前缘亚相,SQ4‑RST(湖退体系域)沉积时期发育以泥岩为主的滨浅湖亚相。SQ1—SQ4沉积相演化依次经历湖泊—辫状河三角洲—曲流河三角洲—辫状河三角洲—湖泊相的演化规律。研究成果可以为轮南地区下步岩性油气藏的勘探提供地质基础。The lack of systematic understanding of basic geology of Triassic clastic rocks and the unclear understanding of sand bodies distribution law of Lunnan area of Tarim Basin restrict further exploration in this area,especially the exploration of potential lithologic reservoirs,so systematic sedimentary facies research is very important.Sequence strata in this area are redefined by fully using core,logging and seismic data,and sedimentary facies distribution and evolution laws in the sequence framework are determined.The results show that Triassic is divided in to 43rd-order sequences including SQ1,SQ2,SQ3 and SQ4.Study of identification marks of sedimentary facies determines that that braided river delta facies,meandering river delta facies and lake facies are mainly developed in this area.shore-shallow lake subfacies dominated by mudstone developed during SQ1 sedimentary period,braidedriver delta front subfacies developed during SQ2 sedimentary period,meandering river delta front subfacies developed during SQ3 sedimentary period,braided river delta front subfacies developed during SQ4-TST sedimentary period(lacustrine transgressive system tract),and shore-shallow lacustrine subfacies dominated by mudstone developed during SQ4-RST sedimentary period(lacustrine regressive system tract).SQ1-SQ4 sedimentary facies follows lacustrine-braided river deltaic-meandering river deltaic-braided river deltaica-lacustrine evolution law.The research results provides geological basis for further exploration of lithologic reservoirs in Lunnan area.

关 键 词：层序地层 沉积相 沉积演化 塔里木盆地 轮南地区 三叠系 

分 类 号：TE122[石油与天然气工程—油气勘探]