塔里木盆地寒武系——奥陶系碳酸盐岩层序地层特征
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摘要
层序顶部边界的研究在碳酸盐岩层序研究中非常重要,碳酸盐岩层序顶部边界可分为暴露—整合层序边界和弱暴露—整合层序边界。弱暴露—整合层序边界称为A型层序边界,其层序称为A型层序。暴露—整合层序边界称为B型层序边界,其层序称为B型层序或AB型层序。通过野外露头观察、岩心观察、钻/测井层序分析以及地震资料的综合解释,建立了塔里木盆地寒武系—奥陶系层序地层格架:寒武系划分8个层序,奥陶系划分9个层序。寒武系—中下奥陶统以及上奥陶统吐木休克组、良里塔格组为碳酸盐台地沉积,碳酸盐岩层序包括基准面上升半旋回和基准面下降半旋回的沉积,将这些层序划分为A型层序、B型层序和AB型层序。
The study on top boundary of sequence is very important to carbonate sequence study.The top boundary of carbonate sequence could be divided into the exposed and concordant sequence boundary and the weak exposed and concordant sequence boundary.The weak exposed and concordant sequence boundary is known as A-type sequence boundary,and the sequence is A-type sequence.The exposed and concordant sequence boundary is known as B-type sequence boundary,and the sequence is B-type sequence or AB-type sequence.Through field outcrop survey,core survey,drilling/logging sequence analysis and comprehensive interpretation of seismic data,the sequence stratigraphic framework of Cambrian-Ordovician of Tarim Basin is established:eight sequences of Cambrian and nine sequences of Ordovician.The Tumuxiuke Formation and the Lianglitage Formation of Cambrian-Lower and Middle Ordovician and the Upper Ordovician are carbonate platform sediments,and the carbonate sequence consists of the sediments of the hemicycle of rising base level and declining base level,which divides the sequences into A-type sequence,B-type sequence and ABtype sequence.
The study on top boundary of sequence is very important to carbonate sequence study.The top boundary of carbonate sequence could be divided into the exposed and concordant sequence boundary and the weak exposed and concordant sequence boundary.The weak exposed and concordant sequence boundary is known as A-type sequence boundary,and the sequence is A-type sequence.The exposed and concordant sequence boundary is known as B-type sequence boundary,and the sequence is B-type sequence or AB-type sequence.Through field outcrop survey,core survey,drilling/logging sequence analysis and comprehensive interpretation of seismic data,the sequence stratigraphic framework of Cambrian-Ordovician of Tarim Basin is established:eight sequences of Cambrian and nine sequences of Ordovician.The Tumuxiuke Formation and the Lianglitage Formation of Cambrian-Lower and Middle Ordovician and the Upper Ordovician are carbonate platform sediments,and the carbonate sequence consists of the sediments of the hemicycle of rising base level and declining base level,which divides the sequences into A-type sequence,B-type sequence and ABtype sequence.
引文
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