| 摘要: |
| 依据块体搬运沉积体系的地球物理识别特征,利用最新采集的二维和三维高分辨率地震资料,在南海深水区域的琼东南盆地、白云凹陷和文莱深水地层中发现了块体搬运沉积体系(MTDs);建立典型MTDs的沉积模式,探讨MTDs的深水油气勘探意义。结果表明:MTDs表现为弱振幅和反射杂乱的特点,发育正断层、逆冲断层、挤压脊和褶皱等沉积构造;典型的MTDs可以划分为头部拉张区域、体部滑移-挤压区域和趾部挤压区域3个结构单元;MTDs主要是富泥沉积物,在深水油气勘探中往往充当良好盖层,容易与浊流沉积体系一起形成深水地层圈闭,也有部分MTDs是富砂沉积物,可以成为潜在油气储层。 |
| 关键词: 南海 深水 块体搬运沉积体系 沉积模式 地震识别特征 |
| DOI：10.3969/j.issn.1673-5005.2011.05.003 |
| 分类号::TE 121.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目 (40906028);中国科学院重要方向性项目(KZCX2-YW-229);中国科学院海洋地质与环境重点实验室开放课题(MGE2010KG07) |
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| Mass transport deposits and its significance for oil & gas exploration in deep water regions of South China Sea |
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WANG Da wei1,2, WU Shi guo1,2, LÜ Fu liang3, WANG Bin3
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(1.Key Laboratory of Marine Geology & Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Marine Oil & Gas Research Center,Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3.Hangzhou Institute of Petroleum Geology, PetroChina, Hangzhou 310013, China)
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| Abstract: |
| Based on the geophysical identification characteristics, by the high resolution deep water 2D and 3D seismic data, the mass transport deposits (MTDs) were found in the deep water formations of the South China Sea, which includes Qiongdongnan Basin, Baiyun Sag and Brunei. The sediment model of MTDs was built, and its significance for deep water oil and gas exploration was discussed. The results show that MTDs are characterized by low amplitude, chaotic and translucent seismic reflection. And they are easy to form many sedimentary structures such as normal fault, thrust fault, pressure ridge and fold. The typical MTDs can be divided into three sections such as tensional head, compressive body and toe. MTDs are mainly mud rich sediments and can usually be as excellent cover,and form deep water trap cooperation with turbidity system. A little fraction of sand prone MTDs can be a potential reservoir. |
| Key words: South China Sea deep water mass transport deposits system sediment model seismic identification characteristics |
