苏盖特布拉克剖面微生物岩地层特征及沉积演化  

Stratigraphic Characteristics and Sedimentary Evolution of Microbial Rocks in Sugatebulak Outcrop Section

作　　者：昌琪[1] 郭峰 尚凯[1] 杨兆伟 郭睿婷 韦悦 CHANG Qi;GUO Feng;SHANG Kai;YANG Zhao-wei;GUO Rui-ting;WEI Yue(Research Institute of Exploration and Development, Sinopec Northwest Oilfield Branch,Urumqi 830011, Xinjiang, China;School of Earth Science and Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China)

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [2]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《承德石油高等专科学校学报》2021年第5期12-19,共8页Journal of Chengde Petroleum College

基　　金：国家自然科学基金项目(古海洋环境与生物礁发育及兴衰的响应):41002043;陕西省教育厅重点基金项目(古生产力与优质烃源岩富集的响应规律研究):14JS081。

摘　　要：为阐明苏盖特布拉克地区典型微生物礁地层岩相组合及沉积演化特征,进行了基于高精度剖面实测(1:100)、镜下鉴定及生物化石分析的研究。研究结果表明,肖尔布拉克组分为上下两段,岩石类型以灰色粉晶云岩、残余砂屑粉细晶白云岩为主,可见硅质岩薄层或条带,常见沉积构造有水平层理及叠层石构造等。肖尔布拉克组下段为微生物丘及局限台地潟湖沉积,上段为微生物礁滩发育段,岩性在横向上有变化,在东北部的礁主体剖面上,主要为残余砂屑粉晶白云岩;在西南部的礁翼剖面上,则为灰色薄层状粉晶白云岩,见硅质结核,为台地边缘微生物礁滩复合体环境。微生物礁沉积演化特征为颗粒滩→附枝菌礁→凝块石→叠层石。In order to clarify the stratigraphic lithofacies association and sedimentary evolution of typical microbial reefs of Sugatebulak area,this paper studies the high-precision profile measurement(1∶100),microscopic identification and biological fossil analysis.The results show that Shorebrak formation is divided into upper and lower sections,and the rock types are mainly gray silty dolomite and residual sand dust silty fine-grained dolomite,with thin layers or strips of siliceous rocks visible,and common sedimentary structures include horizontal bedding and stromatolitic structure.The lower member of Shoerbrak formation is deposited by microbial mound and limited platform lagoon.The upper section is the microbial reef beach development section,and the lithology changes horizontally.In the main section of the reef in the northeast,it is mainly residual sand debris powder dolomite.On the southwest reef wing profile,it is gray thin-layer silty dolomite with siliceous nodules,which is a microbial reef-beach complex environment at the platform margin.The sedimentary evolution of microbial reef is characterized by granular beach→epiphyte reef→agglomerate→stromatolite.

关 键 词：柯坪 肖尔布拉克组 地层特征 沉积演化 

分 类 号：P618.130.2[天文地球—矿床学]