南海北部陆坡深水区构造演化及其特征

doi:10.7623/syxb201004002

石油学报 ›› 2010, Vol. 31 ›› Issue (4): 528-533.DOI: 10.7623/syxb201004002

南海北部陆坡深水区构造演化及其特征

张功成

中海油研究总院北京 100027

收稿日期:2010-01-04 修回日期:2010-02-23 出版日期:2010-07-25 发布日期:2010-09-25
通讯作者: 张功成
作者简介:张功成，男，1966年1月生，1994年获中国地质大学（北京）博士学位，现任中海油研究总院勘探研究院总地质师，主要从事石油地质综合研究及勘探评价工作。
基金资助:
国家重大基础研究发展规划（973）项目(2009CB219400)，国土资源部全国油气资源战略选区调查与评价项目（XQ-2004-05）、(XQ-2007-05)和国家科技重大专项(2008ZX05025)联合资助。

Tectonic evolution of deepwater area of northern continental margin in South China Sea

ZHANG Gongcheng

Received:2010-01-04 Revised:2010-02-23 Online:2010-07-25 Published:2010-09-25

摘要/Abstract

摘要：

南海北部陆坡深水区新生代构造是经过两次不同方向海底扩张和短期改造形成的，受红河断裂带走滑作用以及菲律宾板块挤压等主控因素制约，经历了裂谷期、热沉降期和准被动大陆边缘晚中新世以来的新构造期3个构造演化阶段。陆内裂谷期盆地结构呈南北分带、东西分段的盆岭伸展构造格局；热沉降期陆间裂谷区域位于现今的南海洋壳区域，其北部边缘处于被动大陆边缘部位；晚中新世以来南海边缘发生区域沉降，且印度板块向该区东侧挤压，菲律宾海向西挤压，南海北部大陆边缘处于双向挤压状态，在其陆坡深水区形成不同风格的凹陷。其一是半地堑型凹陷，其二是地堑型凹陷。前者主要有北礁凹陷、顺德凹陷、开平凹陷和白云凹陷以外的卫星凹陷，后者为陵水—乐东凹陷、松南—宝岛凹陷和白云凹陷。相对于半地堑型凹陷，3大地堑型凹陷的沉积范围广、沉降幅度大，共同构成深水区富油气区，有可能成为中国南海油气战略接替区。

关键词: 南海北部, 深水区, 构造演化, 新生代构造, 被动大陆边缘, 地堑型凹陷

Abstract:

The Cenozoic structure of the deepwater area in the northern South China Sea was generated under the condition of two times of basin expansion and short-term reconstruction in different directions of South China Sea and was also controlled by the actions of Honghe fault strike-slip and Philippine Plate extrusion. The tectonic evolution experienced the intracontinental rift period, intercontinental thermal subsidence period and neotectonic period of quasi-passive continental margin. In the intracontinental rift period, the basin structure was in the north-south sub-zone and east-west sub-section shape and then formed the basin-range extensional structure. In the intercontinental thermal subsidence period, the rift occurred in the current South China Sea, and the north edge of the rift was in the northern passive continental margin with regional thermal subsidence. Since the Late Miocene, the regional subsidence action occurred in the margin of South China Sea.The Indian Plate extrusion from the east part and Philippine Plate extrusion from the west part made the continental margin of the northern South China Sea keeping bidirectional extrusion status. So, two types of depressions exited in the east and west areas of the continental margin in the northern South China Sea. One is the half graben depression, and the other is the graben depression. The former includes North Reef Depression, Shunde Depression, Kaiping Depression and satellite depressions outside of Baiyun Depression, the latter includes Lingshui-Ledong Depression, Songnan-Baodao Depression and Baiyun Depression. Relative to the half graben depression, the three large graben depressions, with a wide sedimentary range and large subsidence, together constitute the deepwater area rich in oil and gas and may become a strategic replacement area for oil and gas of South China Sea.

Key words: northern South China Sea, deepwater area, tectonic evolution, Cenozoic structure, passive continental margin, graben depression

张功成. 南海北部陆坡深水区构造演化及其特征[J]. 石油学报, 2010, 31(4): 528-533.

ZHANG Gongcheng. Tectonic evolution of deepwater area of northern continental margin in South China Sea[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(4): 528-533.

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南海北部陆坡深水区构造演化及其特征

Tectonic evolution of deepwater area of northern continental margin in South China Sea

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