Evolution of strike-slip faults in the Shaleitian bulge of the western Bohai offshore and their control on hydrocarbons

doi:10.7623/syxb201202004

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (2): 204-212.DOI: 10.7623/syxb201202004

• Petroleum Exploration • Previous Articles Next Articles

Evolution of strike-slip faults in the Shaleitian bulge of the western Bohai offshore and their control on hydrocarbons

PENG Wenxu 1,2　ZHANG Zhiqiang 2　JIANG Liqun 2　SHI Wenlong 2　CHEN Guotong 2

Received:2011-09-11 Revised:2012-01-09 Online:2012-03-25 Published:2012-05-17

渤海西部沙垒田凸起区走滑断层演化及其对油气的控制作用

彭文绪 1,2　张志强 2　姜利群 2　石文龙 2　陈国童 2

1同济大学海洋与地球科学学院　上海　200092；2中海油渤海油田勘探开发研究院　天津　300452

通讯作者: 彭文绪
作者简介:彭文绪，男，1972年9月生，1998年毕业于中国石油大学（北京），现为同济大学海洋与地球科学学院在读博士研究生、中海油渤海油田勘探开发研究院高级工程师，主要从事油气勘探研究。
基金资助:
国家重大科技专项“近海大中型油气田形成条件及勘探技术”（2008ZX05023）资助。

Abstract

Abstract:

Buried hills in the Shaleitian bulge of the western Bohai offshore are composed of Archaeozoic granite, which is immediately covered by Neogene fluvial clasolites. In this area there is a well-developed NE dextral strike-slip fault that stretches for about 20km and slantingly cuts through the whole Shaleitian bulge. The angle between the NE and NW strike-slip faults within the buried hills is about 100°. The major NE strike-slip fault keeps unceasingly active, while NW faults being no longer active in Neogene extend discontinuously with partial segments displayed as channels. Strike-slip faults in this area commonly show a minus flower structure and the Neogene tectonic movement induced numerous approximately-EW dextral extensional minor faults near the major strike-slip fault, which cut the major strike-slip fault occasionally. Based on detailed interpretations of high-resolution seismic data, we divided the evolution of faults in this area into three stages: the formation of base strike-slip faults in pre-Neogene, the formation of feebly-en-echelon faults in cover strata in early Neogene and the formation of tenso-shear and strongly-en-echelon faults in cover strata in late Neogene. Multiperiodic activities of strike-slip faults in the uplifted area not only formed faulted-anticline traps but also controlled Paleogene deposits on both sides of the faults, exerting an influence on the accumulation and redistribution of hydrocarbons.

Key words: strike-slip fault, flower structure, Shaleitian Bulge, Bohai Bay Basin

摘要：

渤海海域西部沙垒田凸起区潜山为太古界花岗岩，新近系河流相碎屑岩直接覆盖在基底潜山之上。该区发育长约20 km的NE向右旋走滑断层，斜切整个凸起。潜山内发育的NE和NW向两组走滑断层走向夹角约100°，NE向主走滑断层持续活动至今；NW向断层延续较短，局部表现为沟道，新近纪停止活动。该区走滑断层整体表现为负花状构造。新近纪构造运动在主走滑断层附近诱发大量近EW向左旋张扭性小断层并对主走滑断层形成切割。高分辨率三维地震资料精细解释表明，该区断层演化经历了三个阶段，即新近纪前基底断裂走滑阶段、新近纪早期盖层张性断裂弱雁列化阶段、新近纪晚期盖层张扭性断裂强雁列化阶段。凸起区走滑断层的多期活动不仅形成了断背斜圈闭，而且控制了走滑断层两盘古近系的沉积，对油气聚集和重新分配产生影响。

关键词: 走滑断层, 花状构造, 沙垒田凸起, 渤海湾盆地

PENG Wenxu　ZHANG Zhiqiang　JIANG Liqun　SHI Wenlong　CHEN Guotong. Evolution of strike-slip faults in the Shaleitian bulge of the western Bohai offshore and their control on hydrocarbons[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(2): 204-212.

彭文绪　张志强　姜利群　石文龙　陈国童. 渤海西部沙垒田凸起区走滑断层演化及其对油气的控制作用[J]. 石油学报, 2012, 33(2): 204-212.

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Evolution of strike-slip faults in the Shaleitian bulge of the western Bohai offshore and their control on hydrocarbons

渤海西部沙垒田凸起区走滑断层演化及其对油气的控制作用

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