延伸性走向滑动复合盆地的构造-序列演化--以渤海湾盆地东部的庙西南次级海沟为例

IF 3.7 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Sheng Fu , Haifeng Yang , Lijun Song , Wei Zhou , Jiawang Ge , Yanqin Guo
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引用次数: 0

摘要

在大陆裂谷盆地,尤其是具有延伸走向滑动复合特征的裂谷盆地内,构造对形成层序地层学的重要意义无论怎样强调都不为过。这些盆地往往蕴藏着丰富的石油和天然气储量,由其错综复杂的断层系统和动态的构造相互作用所决定。尽管这些盆地具有重要的经济意义,但对其构造-序列特征的探索仍然不足,影响了对石油系统的理解和预测。本研究对渤海湾盆地东部的庙西南亚陷进行了全面的构造-层序分析,该亚陷是郯庐断裂带东支交汇的大陆湖相亚陷。通过整合大量的三维地震数据、有线测井记录和以往的研究,我们建立了一个详细的构造-序列框架,并揭示了支配盆地演化的延伸性走向-滑动断层系统中几何和运动特征的复杂相互作用。我们的研究揭示了一个多层序列地层结构,包括两个一阶序列、四个二阶序列和七个三阶序列。郯庐断裂带东支(EB-TLFZ)的西次支被确定为以南北走向为主的走向滑动断层,而东次支则表现出持续拉张剪切走向滑动断层带的特征。研究还显示,断裂系统的断层走向从底部的多向过渡到东北-东北-东向,与引导断层活动和沉积变形的不同构造阶段相对应。此外,下陷的伸展和走向滑动断层系统都经历了分段增长演变,影响了盆地沉积中心和沉降中心的西移和北移模式。总体而言,庙西南次级拗陷内的层序发育主要受一、二级伸展断层的调控,EB-TLFZ次级分支断层提供了进一步的调整作用。这项研究为了解伸展走向滑动复合盆地的构造-层序动力学提供了重要依据,对未来的油气勘探和开采具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tectono-sequence evolution of an extensional strike-slip composite basin, a case study of the Miaoxi'nan sub-sag in the eastern Bohai Bay Basin

Tectono-sequence evolution of an extensional strike-slip composite basin, a case study of the Miaoxi'nan sub-sag in the eastern Bohai Bay Basin
The significance of tectonics in shaping sequence stratigraphy within continental rift basins, especially those with extensional strike-slip composite characteristics, cannot be overstated. These basins, often repositories of rich oil and gas reserves, are defined by their intricate fault systems and dynamic tectonic interplay. Despite their economic importance, the tectono-sequence characteristics of these basins remain underexplored, affecting the understanding and prediction of petroleum systems. This study presents a comprehensive tectono-sequence analysis of the Miaoxi'nan sub-sag in the eastern Bohai Bay Basin, a continental lacustrine sag intersected by the eastern branch of the Tan-Lu fault zone. By integrating extensive 3D seismic data, wireline logs, and previous research, we establish a detailed tectono-sequence framework and unravel the complex interplay of geometric and kinematic characteristics within the extensional strike-slip fault system that governs the evolution of the basin. Our investigation reveals a multi-tiered sequence stratigraphic structure comprising two first-order, 4 s-order, and seven third-order sequences. The west sub-branch of the East branch of the Tan-Lu fault zone (EB-TLFZ) is identified as a strike-slip fault with a predominantly south-north strike, while the east sub-branch exhibits characteristics of a persistent tension-shear strike-slip fault zone. The study also shows a transitional fault strike of the rifting system from a multi-directional orientation at the base to a northeast-northeast-east direction, corresponding with different tectonic stages that have directed fault activities and sedimentary deformation. Additionally, both the extensional and strike-slip fault systems of the sag have experienced segmental growth evolution, influencing the westward and northward migration patterns of the basin's depocenter and subsiding center. Overall, the sequence development within the Miaoxi'nan sub-sag is predominantly regulated by the first- and second-order extensional faults, with the EB-TLFZ sub-branch faults providing further adjustment. This study provides vital insights into the tectono-sequence dynamics of extensional strike-slip composite basins, with implications for future hydrocarbon exploration and exploitation.
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来源期刊
Marine and Petroleum Geology
Marine and Petroleum Geology 地学-地球科学综合
CiteScore
8.80
自引率
14.30%
发文量
475
审稿时长
63 days
期刊介绍: Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.
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