| 典型箕状断陷湖盆层序划分及层序结构样式:以霸县凹陷古近系为例 |
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| 引用本文： | 张自力,朱筱敏,张锐锋,李琦,曹兰柱,田建章,毕英捷,李翔.典型箕状断陷湖盆层序划分及层序结构样式:以霸县凹陷古近系为例[J].地球科学,2020,45(11):4218-4235. |
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| 作者姓名： | 张自力 朱筱敏 张锐锋 李琦 曹兰柱 田建章 毕英捷 李翔 |
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| 作者单位： | 1.中国石油大学地球科学学院, 北京 102249 |
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| 基金项目： | 国家重大科技专项2017ZX05001-002-002 |
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| 摘 要： | 不整合界面被认为是一个具有等时意义的界面，在陆相断陷盆地中这些规模大小不一的不整合界面通常对应着不同级别的层序边界.本次以霸县凹陷古近系为研究目标，基于2 552 km2三维地震，结合工区内800余口探井钻/测井、岩心及前人研究成果等资料.以构造-层序分析为主线，由盆地结构入手分析构造演化和不整合面特征，分构造层系梳理不整合面及相对应的整合面与层序界面之间的对应关系，明确不同物源和古构造背景下的层序结构样式和沉积体系充填响应模式.将古近系划分为1个一级层序，3个二级层序和14个三级层序，结合断陷盆地构造演化过程在霸县凹陷识别4类9种层序充填样式.认为陆相断陷湖盆幕式构造演化过程中层序的充填过程同样具有旋回性和分段性特征.断陷湖盆层序充填具有多样性，层序旋回结构具有不对称性，体系域发育具有不完整性等特征.通过建立典型断陷盆地层序结构和沉积体系发育特征响应模型，为同类型盆地中的岩性油气勘探提供必要的理论方法和技术支持.
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| 关 键 词： | 层序地层 不整合面 三维地震 断陷湖盆 古近系 霸县凹陷 沉积学 |
| 收稿时间： | 2019-12-26 |
Sequence Framework and Sequence Filling Style in Lacustrine Rift Basin: Taking Paleogene in Baxian Sag as an Example |
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| Abstract: | Unconformity interface is considered to be an isochronal interface. In lacustrine basin, these unconformity interfaces of different sizes usually correspond to sequence boundaries of different levels. In this study, It takes the typical asymmetrical half-graben of the Paleogene Baxian sag, in Bohai Bay basin as the study object, and is based on 2 552 km2 3D seismic data, combined with more than 800 wells/logs, cores and previous research results. Utilizing tectonic-sequence analysis method, starting with the basin structure analysis, in this paper it analyzes the structural evolution and unconformity surface characteristics, sorts out the unconformity surface and the corresponding relationship between the integration surface and the sequence interface according to the structural strata, and clarifies the sequence archtecture under the different provenance and paleostructures. The Paleogene in Baxian sag is divided into 1 first-order sequence, 3 second-order sequences and 14 third-order sequences, and four types and nine sedimentary filling patterns under established sequence framework. It is believed that the filling process of sequence is similar to tectonic activity, and has the characteristics of segmentation and episode. The sequence filling of lacustrine rift basin is diverse, the sequence cycle structure is asymmetric, and the system tract is incomplete. By establishing a typical sequence architecture and sedimentary model in rift basin, it provides the necessary theoretical methods and technical support for lithologic oil and gas exploration in the same type of basin. |
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