| 文莱-沙巴盆地深水褶皱冲断带构造变形特征及成因机制 |
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| 引用本文： | 唐武,赵志刚,张功成,谢晓军,刘世翔,王一博,宋双,王龙,孙瑞,郭佳.文莱-沙巴盆地深水褶皱冲断带构造变形特征及成因机制[J].地球物理学报,2018,61(10):4281-4295. |
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| 作者姓名： | 唐武 赵志刚 张功成 谢晓军 刘世翔 王一博 宋双 王龙 孙瑞 郭佳 |
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| 作者单位： | 中海油研究总院有限责任公司, 北京 100028 |
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| 基金项目： | 国家自然科学基金重大研究计划"南海深海地质演变对油气资源的控制作用"（91528303），国家科技重大专项"曾母-北康盆地群油气地质条件研究与勘探方向选择"（2016ZX05026-004）资助. |
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| 摘 要： | 为揭示活动陆缘深水褶皱冲断带的特征及成因，本文利用地震和区域地质资料的综合分析，系统阐述了文莱—沙巴盆地深水褶皱冲断带的构造变形特征，并结合盆地演化动力学特点，探讨其构造变形机制及其对深水区油气成藏的影响.研究结果表明，文莱—沙巴盆地深水褶皱冲断带具有"垂向分期、平面分段"的特点，垂向上，以中中新统底界面为界可划分为下部（始新世-早中新世）和上部（中中新世-现今）两套逆冲褶皱冲断体系，其中下部逆冲褶皱冲断带的形成与古南海的俯冲作用密切相关，上部逆冲褶皱冲断带是中中新世以来三角洲前缘重力滑动与苏禄海扩张造成的区域挤压应力远程效应共同作用的结果，且苏禄海扩张造成的远程挤压效应主控平面上南北段褶皱冲断带变形的差异性，导致北段褶皱变形强度大于南段，具有背斜褶皱数量多、褶皱间距离短、逆冲断层倾角陡的特点，南段反之；且晚上新世以来北段深水区地层缩短量大于陆架区伸展量，两者之差为2~6 km，而南段两者相当，仅受三角洲前缘重力滑动影响.整个褶皱冲断带发育断弯、断展、断滑褶皱等3种断层相关褶皱以及叠瓦扇和冲起构造2种逆冲构造组合，是多期NW向挤压应力作用下形成的大型逆冲推覆构造，以前展式向盆地扩展.此外，由于中中新世以来逆冲断层的持续活动，研究区深水褶皱冲断带发育众多构造圈闭，油气成藏条件优越，且南段优于北段，靠近陆坡的近端优于远端，可作为勘探部署重点.
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| 关 键 词： | 深水褶皱冲断带 文莱-沙巴盆地 构造特征 成因机制 油气意义 南海 |
| 收稿时间： | 2017-09-06 |
Structural deformation characteristics and genetic mechanism of deepwater fold and thrust belts in the Brunei-Sabah Basin |
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| TANG Wu,ZHAO ZhiGang,ZHANG GongCheng,XIE XiaoJun,LIU ShiXiang,WANG YiBo,SONG Shuang,WANG Long,SUN Rui,GUO Jia.Structural deformation characteristics and genetic mechanism of deepwater fold and thrust belts in the Brunei-Sabah Basin[J].Chinese Journal of Geophysics,2018,61(10):4281-4295. |
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| Authors: | TANG Wu ZHAO ZhiGang ZHANG GongCheng XIE XiaoJun LIU ShiXiang WANG YiBo SONG Shuang WANG Long SUN Rui GUO Jia |
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| Institution: | CNOOC Research Institute Ltd, Beijing 100028, China |
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| Abstract: | In order to reveal the characteristics and origins of deepwater fold and thrust belts (DWFTBs) in active margins, based on seismic and regional geology data, this study has characterized the structural deformation of DWFTBs in the Brunei-Sabah Basin (BSB). Combining with the dynamic traits of basin evolution, the genetic mechanism of the structural deformation and its influence on deepwater hydrocarbon accumulation were discussed. The results show that the DWFTBs of BSB has stages in the vertical and segmentation in planar. Vertically, bounded the bottom of Middle Miocene, the DWFTBs can be divided into lower (Eocene-Early Miocene) and upper (Middle Miocene-present) thrust fold systems, of which the formation of lower part was controlled by the subduction of the proto-South China Sea and the upper part was the result of delta front gravity sliding and the far-field effect of regional compression stresses caused by the seafloor spreading of the Sulu Sea, and the latter controlled the deformation differences between the southern part and northern part in planar, leading to the deformation strength of northern part stronger than the southern part, with more anticline folds, narrow fold distances and steeper thrust faults developed. In addition, the Late Pliocene to Holocene deepwater shortening is bigger than the shelf extension in the northern part with 2~6 km differences, while the values of those are nearly equal in the southern part, which was only influenced by the delta front gravity sliding. Three types of fault-related folds and two types of thrust structural associations developed within the DWFTBs, namely, fault-bend folds, fault-propagation folds and detachment folds, imbricate fan and pop-up, respectively. These features resulted from NW direction compression stress, forming large-scale thrust nappe structures, moving toward the basin in a piggyback propagation manner. Additionally, owing to continual activity of thrust faults since Middle Miocene, several structural traps formed within the DWFTBs, with favorable hydrocarbon accumulation conditions developed, which are better in the south than in the north, and better in the proximal end than the distant end, which could be priorities in the exploration plan. |
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| Keywords: | Deepwater fold and thrust belts Brunei-Sabah Basin Structural characteristics Genetic mechanism Hydrocarbon significance South China Sea |
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