束鹿凹陷中部古近系沙河街组第三段下部层序特征
|
摘要
通过岩心观察、薄片鉴定、地化分析,钻井地层层位划分与对比、地震层位标定和追踪等项工作的研究,结合区域构造、沉积演化特征等分析认为,冀中坳陷束鹿凹陷中部古近系沙河街组第三段下部是一个完整的三级层序。该层序顶底界面特别是顶界面的识别标志分别是:岩性上,碳酸盐岩含量高且稳定;电性上,电阻率曲线呈块状高阻、自然伽马值普遍较低;地震上,反射特征清楚,顶界面为一明显顶超面;地化指标显示界面上下有机碳含量迥异。
Based on stratigraphic correlation, core observation, thin section identifying, geochemistry analyzing and seismic horizon calibrating and tracing, and in combination with the analysis of regional tectonic and sedimentary evo- lution characteristics, an entire third- sequence is considered to be existed in lower part of the third member of Shahejie Formation in the Middle part of Shulu Sag of the middle Depression of Hebei Province. Indicators of sequence boundary, especially the top boundary were identified by using the data of lithologic character, well logging, seism, geochemistry analyzing and so on. These indicators are: the content of carbonate rock is high and steady: the exhibition of the resistivity curves is massive and high value, the natural gamma value is very low; the seismic reflection is very good and the top surface is a good toplap surface and the abundance of organic material is very different.
Based on stratigraphic correlation, core observation, thin section identifying, geochemistry analyzing and seismic horizon calibrating and tracing, and in combination with the analysis of regional tectonic and sedimentary evo- lution characteristics, an entire third- sequence is considered to be existed in lower part of the third member of Shahejie Formation in the Middle part of Shulu Sag of the middle Depression of Hebei Province. Indicators of sequence boundary, especially the top boundary were identified by using the data of lithologic character, well logging, seism, geochemistry analyzing and so on. These indicators are: the content of carbonate rock is high and steady: the exhibition of the resistivity curves is massive and high value, the natural gamma value is very low; the seismic reflection is very good and the top surface is a good toplap surface and the abundance of organic material is very different.
引文
1郭了萍,李登伟,彭军等．我国层序地层学研究的发展趋势[J]．河南石油,2005,19(6):1～6
2汤军．基于沉积基准面概念的层序划分-以濮城油田南区沙二上亚段2十3砂层组为例[J]．河南石油, 2006,20(4):7～9
3刘振峰．地震资料在层序地层学中的应用进展[J]．地球物理学进展,2003,18(1):24～29
4陆基孟．地震勘探原理(下册)[M]．东营:石油大学出版社,1993．399
5孙志华．层序界面在地球物理资料上的响应特征[J]．石油地球物理勘探,2001,36(5):626～632
6李美俊．层序地层地球化学[J]．石油实验地质,2003, 25(5):487～491
7田景春．沉积地球化学在层序地层分析中的应用[J]．成都理工大学学报(自然科学版),2006,33(1):30～35
2汤军．基于沉积基准面概念的层序划分-以濮城油田南区沙二上亚段2十3砂层组为例[J]．河南石油, 2006,20(4):7～9
3刘振峰．地震资料在层序地层学中的应用进展[J]．地球物理学进展,2003,18(1):24～29
4陆基孟．地震勘探原理(下册)[M]．东营:石油大学出版社,1993．399
5孙志华．层序界面在地球物理资料上的响应特征[J]．石油地球物理勘探,2001,36(5):626～632
6李美俊．层序地层地球化学[J]．石油实验地质,2003, 25(5):487～491
7田景春．沉积地球化学在层序地层分析中的应用[J]．成都理工大学学报(自然科学版),2006,33(1):30～35
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心