塔中地区石炭系生屑灰岩段成岩层序地层学  

Diagenetic Sequence Stratigraphy of Carboniferous Bioclastic Limestone Member in Central Tarim Basin

作　　者：崔金栋[1] 郭建华[1] 朱美衡[2] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中国石油化工股份有限公司江汉油田分公司物探研究院,武汉430035

出　　处：《地质科技情报》2011年第5期23-28,共6页Geological Science and Technology Information

基　　金：国家科技重大专项(2008ZX05002-005)

摘　　要：以塔中地区石炭系生屑灰岩段为研究对象,进行了成岩层序地层学研究。依据钻井、测井等多种资料将生屑灰岩段划分为1个三级层序,识别出了海侵体系域和高位体系域,低位体系域在研究区不发育,确定了海侵体系域为开阔碳酸盐岩台地沉积,高位体系域为带障壁海岸的潮坪沉积。分别从准同生白云岩化作用、大气淡水溶蚀作用和海底胶结作用3个方面对成岩作用和层序格架的关系进行了研究:通过电子探针和碳氧同位素组成分析了高位体系域的准同生白云岩化作用,确定高位体系域上部的大气淡水溶蚀作用形成了针孔状溶孔,指出海侵体系域的中底部发生了海底胶结作用。从3种主要成岩作用在层序中体系域不同位置的影响,对生屑灰岩段成岩层序地层学模式进行了剖析,指出大气淡水溶蚀作用形成的针孔状溶孔为有利的油气储集空间。Taking Carboniferous bioclastic limestone member in Tarim Basin as the research object,this paper studies diagenetic sequence stratigraphy in the area.Based on drilling,logging,and other information,the bioclastic limestone was divided into one third-sequence.The transgressive system tract and highstand system tract were identified and the lowstand systems tract was not developed.Transgresive system tract was defined as an open carbonate platform deposition,and highstand system tract as tidal flat deposition with a barrier coast.The relationship between diageness and sequence stratigraphic framework is studied from three perspectives： penecontemporaneous dolomitization,meteoric corrosion and cementation on the sea bed.Penecontemporaneous dolomitization of highstand system tracts has been analyzed via the study of electron probe and the components of oxygen and carbon isotopic.The study confirms that carbonate rocks were formed because of meteoric corrosion in the upper part of highstand system tracts and that cementation on the sea bed has taken shape in the middle and bottom part of transgressive system tracts.Thorough analysis has been made on diagenetic sequence stratigraphy of carboniferous bioclast limestone member in terms of the influence of three major types of diageneses on system tracts in the sequence.It is suggested that the carbonate rocks of meteoric corrosion serve as favorable hydrocarbon bearing space.

关 键 词：生屑灰岩段 成岩作用 层序地层 体系域 塔中地区 

分 类 号：P539.2[天文地球—古生物学与地层学]