川西北地区中二叠统茅口组沉积特征及模式  

Sedimentary characteristics and sedimentary facies model of the middle Permian Maokou formation in northwestern Sichuan

作　　者：宋学锋 Song Xuefeng(College of Resources Exploration and Engineering,Yangtze University,Jingzhou,Hubei 434020,China)

机构地区：[1]长江大学工程技术学院资源勘查工程学院,湖北荆州434020

出　　处：《东北石油大学学报》2018年第4期66-74,127,共10页Journal of Northeast Petroleum University

基　　金：长江大学工程技术学院科学研究发展基金项目(14j0103)

摘　　要：以单井层序划分为基础,结合岩心、地震和测井资料,研究川西北地区中二叠统茅口组沉积相类型及特征,确定沉积相带分布,建立沉积模式。结果表明:研究区茅口组可分为2个三级层序——SQ1和SQ2,每个层序平均延时5 Ma;主要发育白云岩、生物碎屑灰岩和泥微晶灰岩3种岩石类型;研究区自西向东再向北依次发育盆地相、斜坡相、台地边缘相、开阔台地相、斜坡相和盆地相等沉积相。台地边缘相和开阔台地相发育滩体,其中台缘滩和台内滩储集物性更好,可作为有利勘探区;垂向上,台地边缘相发育于茅二段中晚期—茅三段(SQ1高位体系域时期);平面上,台地边缘相位于广元—绵阳—雅安一带。该结果为研究区茅口组下一步勘探开发提供地质依据。In order to figure out the distribution of sedimentary facies belts and establish sedimentary models to provide geologic basis for progressive exploration.On the basis of wells,cores,seismic and logging data,the sedimentary facies types and characteristics of the middle Permian Maokou formation in northwestern Sichuan were studied.The results show that the Maokou formation in northwestern Sichuan can be divided into two third-order sequences SQ1 and SQ2,each lasted 5 Ma on average.The study area mainly developed three rock types:dolomite,bioclastic limestone and microcrystalline limestone;from west to east to north,Maokou formation developed basin,slope,paltform margin,open platform,slope and basin facies.Shoal developed in paltform margin facies and open platform facies,paltform margin shoal is more favorable than inner-platform shoal.Laterally,the platform margin facies is distributed along Guangyuan-Mianyang-Yaan.Vertically,it developed at about the middle and late period of second member or third member of Maokou formation(the HST of SQ1),which will provide evidence for further geological exploration and exploration.

关 键 词：川西北地区 中二叠统 茅口组 沉积特征 沉积模式 台地边缘 

分 类 号：TE122.2[石油与天然气工程—油气勘探]