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辽东湾坳陷新生代构造改造作用及演化

ISSN号：0563-5020
期刊名称：《地质科学》
时间：0
分类：P542[天文地球—构造地质学;天文地球—地质学]
作者机构：[1]西北大学大陆动力学国家重点实验室,西安710069, [2]中海油研究总院,北京100027, [3]中海石油中国有限公司天津分公司,天津300452
相关基金：国家自然科学基金重点项目（编号：91214301,90814005,41330315）和国家科技重大专项“大型油气田及煤层气开发”（编号：2011ZX05023）资助. 致谢感谢中海油研究总院、中海油天津分公司勘探部和研究院在资料收集等方面给予的大力支持与帮助.

关键词：后期改造, 右旋走滑, 构造演化郯庐断裂辽东湾坳陷, Late-stage reformation, Dextral strike-slip, Tectonic evolution, Tan-Lu fault, Liaodong Bay depression

中文摘要：

利用大量的渤海油气勘探资料与成果对辽东湾坳陷构造演化特点综合分析，揭示出辽东湾坳陷新生代构造改造作用主要表现在：断裂作用、地层抬升刊蚀及褶皱作用，对辽东湾坳陷构造演化过程具有重要的影响。其西部地区现今构造特征主要受前期伸展断层控制，构造改造作用较弱；而东部地区构造改造作用强烈，辽东凸起是在后期构造改造作用下形成的，分隔现今的辽中凹陷与辽东凹陷。郯庐断裂带辽东湾段新生代早期活动特征不明显，始新世末-渐新世主要以伸展作用叠加右旋走滑作用为主；浙新世末-新近纪晚期以右旋走滑作用为主，断裂带活动不控制辽东湾东部地区的沉积。辽东湾坳陷新生代的演化整体可划分为断陷期（孔店组沉积期-沙河街组三段沉积期）、断坳改造期（沙河街组二段沉积期-东营组沉积期）、走滑改造期（馆陶组沉积期至今）3个演化阶段。现今辽东湾坳陷构造格局与沙河街组三段沉积前古构造格局的差异性，对该区海域油气勘探具有重要意义。

英文摘要：

The Liaodong Bay depression is a natural extension of the waters under the Liaohe depression as an important part of the Bohai Bay Basin. Its present-day tectonic pattern is influenced and controlled by Tan-Lu fault system. In this paper, a lot of data and results from the Bohai Sea oil and gas exploration on the tectonic evolution of the Liaodong Bay area features are made by a comprehensive analysis for investigating tectonic evolution and multiple-stage faulting of the Liaodong Bay depression. Cenozoic tectonic transformation is mainly in the role of faulting, uplift and erosion formation and folding, which has an important impact on tectonic evolution in the Liaodong Bay depression. This paper shows that the west area of Liaodong Bay depression was mainly controlled by initial extension and later structural deformations were weaker. To the east, later strik-slip movement significantly transformed the structural framework, forming the Liaodong uplift, which separated the Liaozhong depression and Liaodong depression. In the Early Cenozoic, activity of the Tan-Lu fault in Liaodong Bay depression was not obvious. Initial synrift deposits were superimposed by dextral strike-slip fault from Eocene to Oligocene. From Late Oligocene to Late Neocene, the Tan-Lu fault was only controlled by dextral strike-slip displacement and it did not act as the sedimentary boundary during this period in Liaodong Bay depression. Structural evolution can be divided into three stages： Synrift stage （from Kongdian period to Sha-3 period）, late-stage deformation postrift stage（from Sha-2 period to Dongying period）and strike-slip stage （from Guantao period till now）. Understanding the change of structural framework after Sha-3 stage is of importance in petroleum exploration of this area.

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