川东南地区中二叠统茅口组沉积相特征  

Sedimentary Facies Characteristics of the Middle Permian Maokou Formation in Southeastern Sichuan

作　　者：王俊轲 闫春桥 张钊益 杜安业 

机构地区：[1]成都理工大学能源学院,四川 成都

出　　处：《自然科学》2025年第2期221-230,共10页Open Journal of Nature Science

摘　　要：通过对川东南地区中二叠统茅口组钻井岩心、薄片、野外剖面、测井资料的综合分析,结合前人研究,重新梳理构建了研究区沉积相类型、分布特征及平面分布演化。川东南地区茅口组发育泥晶灰岩、生屑灰岩、泥质灰岩、硅质岩及白云岩等岩性,在碳酸盐岩缓坡型台地沉积模式下沉积相可划分为外缓坡、中缓坡、内缓坡及开阔台地共4种。茅一段沉积初期,川东南地区发生大规模海侵,水体普遍较深,主要发育中缓坡–外缓坡沉积,受川中古隆起的影响,局部发育低能生屑滩;茅二下亚段沉积期,沉积相继承了茅一段沉积特征,中缓坡相呈北西向展布,相较内缓坡水体较深,滩体发育少;茅二上亚段沉积期,受构造–沉积分异作用的影响,川东南地区沉积相由碳酸盐缓坡转变为开阔台地,分布广泛,高能生屑滩较发育;茅三至茅四段沉积期,沉积相延续了茅二上亚段地层的沉积模式,仍为开阔台地相沉积,沉积相带展布转变为北西–南东向,台地内生屑滩继承茅二上亚段位置,水体深度加大,台地分布更加广泛。研究区茅口组沉积期受区域海平面升降、构造活动和沉积相类型的控制,有利沉积相带主要发育在茅二上亚段沉积期,高石梯–荷包场一带发育具有勘探价值规模性的高能生屑滩。Based on the comprehensive analysis of drilling cores, thin sections, field profiles and logging data of Middle Permian Maokou Formation in southeastern Sichuan, combined with previous studies, the types, distribution characteristics and plane distribution evolution of sedimentary facies in the study area are reorganized and constructed. There are micrite limestone, bioclastic limestone, argillaceous limestone, siliceous rock and dolomite in Maokou Formation in southeast Sichuan. Under the carbonate gentle slope platform sedimentary model, the sedimentary facies can be divided into four types: outer gentle slope, middle gentle slope

关 键 词：川东南地区 中二叠统 茅口组 缓坡型台地 沉积相 

分 类 号：P618.13[天文地球—矿床学]