收稿日期: 2008-03-25
修回日期: 2008-06-16
网络出版日期: 2008-12-10
An Example of Coal Bed as the Stratigraphic Sequence Border in Continental Basin of China: Taking the Middle Jurassic of Hongtai Area, Tuha Basin for Example
Received date: 2008-03-25
Revised date: 2008-06-16
Online published: 2008-12-10
在国外成因地层学研究中早已提出将陆相盆地中区域性分布的煤层作为一种层序边界识别标志,为了验证该理论在中国陆相盆地地层层序划分中的适应性,特选择吐哈盆地红台地区进行研究。利用录井、测井、岩心、钻井等资料对红台地区地层划分和沉积相进行研究，研究层段主要为中侏罗统三间房组和七克台组，主要发育有湖泊相的滨浅湖亚相和辫状河三角洲相等沉积相类型。研究区内存在2期较为明显的低位煤层，各期煤层的发育均有旋回性特点，并且煤层中硅质碎屑含量也存在旋回性变化，所以煤层能够作为一种层序边界的识别和对比标志。利用煤层作为层序边界将目的层划分为2个半三级层序，在此基础上根据经典层序地层学理论和研究区目的层位的旋回性特征，将研究层段的层序细分至体系域。
袁波,;陈世悦;夏雨 . 煤层在中国陆相盆地地层层序划分中的应用——以吐哈盆地红台地区中侏罗统为例[J]. 天然气地球科学, 2008 , 19(06) : 810 -815 . DOI: 10.11764/j.issn.1672-1926.2008.06.810
The theory of the coal bed as the stratigraphic sequence border in a continental basin has been put forward abroad. For the purpose of combining this theory with the specific circumstances of the continental basin in China, we apply this theory to the study of the sequence stratigraphy in the Hongtai area, Tuha basin. We utilize the information about logging data, drill core and drilling data to analyze the division of lithostratigraphy and the sedimentary facies in the study area. The research formation is Sanjianfang Formation and Qiketai Formation in Middle Jurassic. And the main sedimentary facies are shore shallow lacustrine subfacies and braided river delta facies. There are two coal developing stages of LST in the study area, and each stage presents the cyclicity feature, the siliciclastic content in the coal bed also presents the cyclicity feature, so the coal bed as the stratigraphic sequence border in continental basin in China is feasible. Finally, we divide stratigraphic sequence in the work area, and the research formation is divided into two and half third order sequences.
Key words： Tuha basin; Hongtai area; Stratigraphic sequence; Coal bed; Identification sign.
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