中上扬子地区中寒武统膏盐岩沉积特征  

Sedimentary characteristics of Middle Cambrian gypsum rock in Middle-Upper Yangtze area

作　　者：张锦[1] 何幼斌[1] 罗进雄[1] 顾志翔[1] 刘小帆 聂鸿宇 ZHANG Jin;HE Youbin;LUO Jinxiong;GU Zhixiang;LIU Xiaofan;NIE Hongyu(School of Geoscience,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学地球科学学院,武汉430100

出　　处：《中国科技论文》2018年第3期265-274,共10页China Sciencepaper

基　　金："十二五"国家油气重大专项(2011ZX05004-001-004);中国石油勘探开发研究院项目(RIPED-2016-JS-196)

摘　　要：为了研究中上扬子地区中寒武统膏盐岩的沉积特征,通过对野外剖面、钻井岩心、岩石薄片等资料的分析,探讨了中上扬子地区中寒武统膏盐岩的发育特征,分析了膏盐岩-碳酸盐岩共生组合的沉积环境及成因模式。研究结果表明:1)按膏盐岩的3种主要成分对其进行成分分类,将研究区中寒武统膏盐岩划分为石膏岩类、含石膏白云岩类和含膏泥(砂)岩类、石盐岩类4大类,并进一步分成8小类,其中含石膏白云岩类最常见,分布最广;2)研究区中寒武统膏盐岩主要分布于陡坡寺组(高台组)、西王庙组(石冷水组)、覃家庙组。横向上,由南至北,沉积环境依次为蒸发潟湖、蒸发台地、蒸发潟湖、局限台地;由西至东,沉积环境依次为蒸发潟湖、局限台地、蒸发潟湖、蒸发潟湖;纵向上,自下而上沉积环境依次为局限台地、蒸发潟湖、蒸发台地、浅滩;3)研究区中寒武统整体上存在川东南—渝东、鄂西—黔北地区、川西南—黔北地区和鄂西南—鄂中南地区3个膏盐岩发育区;4)研究区膏盐岩主要形成于蒸发潟湖环境,主要成因为蒸发作用。To study the sedimentary characteristics of the Cambrian gypsum rock in Middle-Upper Yangtze area,based on the analysis of the well sections,core slice and the observation of measured sections,the development characteristics of the Cambrian gypsum rock in Middle-Upper Yangtze area was discussed and the sedimentary environment and genesis of Middle Cambrian gypsum-carbonate coexistence in Middle-Upper Yangtze area was analyzed.The results indicate that firstly,three main portions of the gypsum rocks are treated as end members,and according to this way the classification of the portion is carried out,the gypsum rock in the study area isdivided into three major categoris(Gypsum rock,with gypsum dolomite,gypsum bearing mud(sand)rock and halite rock),which are then divided into eight smaller classes.Among them,gypsum dolomite is the most common and widespread.Secondly,Middle Cambrian gypsum rocks are mainly distributed in the Douposi Formation(Gaotai Formation),Xiwangmiao Formation(Shilengshui Formation)and Qinjiamiao Formation.In the horizontal direction,from south to north,the sedimentary environment is evaporation lagoon,evaporation platform,evaporation lagoon and restricted platform.From west to east,the sedimentary environment is evaporation lagoon,restricted platform,evaporation lagoon and evaporation lagoon.In the vertical direction,from bottom to top,sedimentary environment is restricted platform,evaporation lagoon,evaporation platform and shoal.Finally,there are three gypsum rock development zones in Middle Cambrian in the study area:east Sichuan-eastern Chongqing and western Hubei-northern Guizhou,southwest Sichuan and northern Guizhou and southwest Hubei and central south Hubei.Comprehensive analysis considers that the gypsum rock mainly forms in the evaporation lagoon environment,and the main factor is evaporation.

关 键 词：膏盐岩 中寒武统 沉积环境 成因模式 中上扬子地区 

分 类 号：P534.41[天文地球—古生物学与地层学]