| JIANG Tao,ZHANG Yingzhao,TANG Sulin,ZHANG Daojun,ZUO Qianmei,LIN Weiren,WANG Yahui,SUN Hui,WANG Bo. 2014. CFD simulation on the generation of turbidites in deepwater areas: a case study of turbidity current processes in Qiongdongnan Basin, northern South China Sea. Acta Oceanologica Sinica, 33(12):127－137 |
| CFD simulation on the generation of turbidites in deepwater areas: a case study of turbidity current processes in Qiongdongnan Basin, northern South China Sea |
| 深水浊流形成过程的水动力学模拟:以南海北部琼东南盆地浊流形成过程为例 |
| Received:June 20, 2014 Revised:September 28, 2014 |
| DOI：10.1007/s13131-014-0582-7 |
| Key words:turbidity current CFD simulation 3D seismic interpretation sedimentary process |
| 中文关键词: 浊流 计算流体力学模拟 三维地震解释 沉积过程 |
| 基金项目:The National Science and Technology Major Project of China under contract No. 2011ZX05025-002-02; the National Natural Science Foundation of China under contract Nos 41476032, 91028009 and 40806019. |
| Author Name | Affiliation | E-mail | | JIANG Tao | Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Kochi 783-8502, Japan | taojiang@cug.edu.cn | | ZHANG Yingzhao | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | TANG Sulin | Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China | | | ZHANG Daojun | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | ZUO Qianmei | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | LIN Weiren | Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Kochi 783-8502, Japan | | | WANG Yahui | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China | | | SUN Hui | Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China | | | WANG Bo | Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China | |
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| Abstract: |
| Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particular, they formulate the most significant clastic accumulations in the deep sea, which become many of the world's most important hydrocarbon reservoirs. Several boreholes in the Qiongdongnan Basin, the northwestern South China Sea, have recently revealed turbidity current deposits as significant hydrocarbon reservoirs. However, there are some arguments for the potential provenances. To solve this problem, it is essential to delineate their sedimentary processes as well as to evaluate their qualities as reservoir. Numerical simulations have been developed rapidly over the last several years, offering insights into turbidity current behaviors, as geologically significant turbidity currents are difficult to directly investigate due to their large scale and often destructive nature. Combined with the interpretation of the turbidity system based on highresolution 3D seismic data, the paleotophography is acquired via a back-stripping seismic profile integrated with a borehole, i.e., Well A, in the western Qiongdongnan Basin; then a numerical model is built on the basis of this back-stripped profile. After defining the various turbidity current initial boundary conditions, including grain size, velocity and sediment concentration, the structures and behaviors of turbidity currents are investigated via numerical simulation software ANSYS FLUENT. Finally, the simulated turbidity deposits are compared with the interpreted sedimentary bodies based on 3D seismic data and the potential provenances of the revealed turbidites by Well A are discussed in details. The simulation results indicate that a sedimentary body develops far away from its source with an average grain size of 0.1 mm, i.e., sand-size sediment. Taking into account the location and orientation of the simulated seismic line, the consistence between normal forward simulation results and the revealed cores in Well A indicates that the turbidites should have been transported from Vietnam instead of Hainan Island. This interpretation has also been verified by the planar maps of sedimentary systems based on integration of boreholes and seismic data. The identification of the turbidity provenance will benefit the evaluation of extensively distributed submarine fans for hydrocarbon exploration in the deepwater areas. |
| 中文摘要: |
| 浊流是湖泊和海洋中沉积物搬运的主要方式之一,尤其是它形成了世界上众多的作为深水油气田储层的深海碎屑沉积体.最近在南海西北部琼东南盆地的几口钻井已经表明,该盆地发育了大量浊流沉积,而且它们都可能成为优质储层.但是,目前关于这些浊流沉积的来源却存在有很多争论.因此,与评价这些浊积体储层质量同样重要的是要阐明其沉积来源.由于浊流沉积规模巨大,对其进行直接研究较为困难,近些年发展起来的数值模拟技术使得对浊流形成过程的数值模拟研究成为了可能.本研究在基于三维地震资料对浊积体的精细解释基础上,对琼东南盆地西部有钻井约束的地震剖面进行了回剥法恢复其古地貌,并据此建立了数值模拟模型.然后在定义了粒度、初始流速、沉积物浊度等初始边界条件后,通过数值模拟软件ANSYS FLUENT正演模拟了浊流的内部结构和其流体动力学过程,并将模拟结果所产生的浊积体几何形态与其地震反射特征进行对比,讨论其潜在的沉积来源和具体沉积过程.模拟结果表明,经钻井A钻遇的浊积体距离其物源区相对较远,以砂质沉积构成为主.综合考虑所模拟的地震测线位置和方位,对比模拟结果与钻井A的实钻岩性表明,钻井A所钻遇的浊积体来源于越南而不是海南岛.该结果也得到了基于钻井和地震剖面所得出的沉积相平面分布特征的证实.该浊积体物源的确定必将对评价琼东南盆地深水区广泛分布的海底扇的油气勘探潜力具有重要意义. |
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