| 晋中南沁水盆地早古生代海平面变化及其对碳酸盐岩储层的制约——以中阳城关剖面为例 |
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| 引用本文：刘波,王英华,许书梅.1997.晋中南沁水盆地早古生代海平面变化及其对碳酸盐岩储层的制约——以中阳城关剖面为例[J].地球学报,18(4):429-437. |
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| 全文下载次数: 2012 |
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| 中文摘要:以中阳城关剖面为例的层序地层学研究表明，晋中南沁水盆地下古生界由２个二级旋回组成，其界面为早奥陶世亮甲山组顶部的平行不整合面。这两个旋回的海面变化曲线形态具有区域乃至全球范围的可比性。由准层序堆叠方式确定的三级旋回具有区域性特点。难以进行全球范围内的对比。各层序均由海进体系域（ＴＳＴ）及高水位体系域（ＨＳＴ）构成，缺低水位体系域（ＬＳＴ）及海退体系域（ＲＳＴ）。潜在储层的发育主要是海退及低水位时期先期高水位体系域的白云石化及随之而发生的淡水淋滤形成的。因而本区储层的产出层位与层序界面具有强烈相关关系。作为 |
| 中文关键词:海面变动 白云石化 储层 |
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| Early Paleozoic Sea_level Changes and Their Constraints to Developments of Carbonate Reservoirs in Qinshui Basin,Shansi ——An Example from Zhongyang County |
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| Abstract:Sequence stratigraphic analysis from Zhongyang County indicates that the lower Paleozoic in Qingshui Basin is composed of two second order sequences,which is bounded by the disconformity on the top of Lower Ordovician Liangjiashan Formation .The form of second order sea_level change curves can be compared with those of other areas,whereas third order sea_level changecurves,defined on stacking patterns of parasequences,are of regional features and without global similarities.Third order sequences of the Lower Paleozoic in studied area are made up of transgressive systems tracts(TST)and highstand systems tracts(HST),and short of lowerstand systems tracts(LST)and regressive systems tracts(RST). Reservoir potential developed by mixing_zone dolmitization and following meteoric leaching of existed HST sediments during regression and lower sea_level time .Therefore,peservoirs potential are closely bound up with sequence boundaries .Being a major reservoir potential of this area,dolostones from the Changshan Formation of the Upper Cambrian upto the Liangjiashan Formation ,was created by dolomitization and meteoric leaching associated with third or fourth order sea_level falls,and its porosities and permiabilities were enhanced by karstification on the disconformity.The inter_and intra grain porosities of lightly dolmitized oolites of the Zhangxia Formation were also developed by alternative exposures during third or fourth order sea level fluctuation. |
| keywords:sea-level changes dolomitization reservoirs |
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