| TANG Xiaoyin,HUANG Shaopeng,YANG Shuchun,JIANG Guangzheng,JI Mo,HU Shengbiao. 2018. Tectono-thermal evolution of the Liwan Sag, deepwater area in the Zhujiang River Mouth Basin, northern South China Sea. Acta Oceanologica Sinica, 37(2):66－75 |
| Tectono-thermal evolution of the Liwan Sag, deepwater area in the Zhujiang River Mouth Basin, northern South China Sea |
| 南海北部珠江口盆地深水区荔湾凹陷构造-热演化 |
| Received:February 27, 2017 Revised:October 20, 2011 |
| DOI：10.1007/s13131-017-1125-9 |
| Key words:tectono-thermal evolution thermal history heat flow deepwater area Liwan Sag |
| 中文关键词: 构造-热演化 热历史 热流 深水区 荔湾凹陷 |
| 基金项目:The Program of the Key Technologies for Petroleum Exploration in Deep Oceanic Areas under contract No. 2011ZX05025-006-05; the Chinese Postdoc Fund, No. 58 General Fund, 2015 under contract No. 2015M582636; the National Natural Science Foundation of China under contract No. 41602251. |
| Author Name | Affiliation | E-mail | | TANG Xiaoyin | Geothermal and Environmental Research Laboratory, Xi'an Jiaotong University, Xi'an 710049, China | xytang2015@xjtu.edu.cn,xytang2015@sina.com | | HUANG Shaopeng | Geothermal and Environmental Research Laboratory, Xi'an Jiaotong University, Xi'an 710049, China | | | YANG Shuchun | CNOOC Research Institute, Beijing 100027, China | | | JIANG Guangzheng | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100049, China | | | JI Mo | CNOOC Research Institute, Beijing 100027, China | | | HU Shengbiao | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100049, China | |
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| Abstract: |
| The Liwan Sag, with an area of 4 000 km2, is one of the deepwater sags in the Zhujiang River (Pearl River) Mouth Basin, northern South China Sea. Inspired by the exploration success in oil and gas resources in the deepwater sags worldwide, we conducted the thermal modeling to investigate the tectono-thermal history of the Liwan Sag, which has been widely thought to be important to understand tectonic activities as well as hydrocarbon potential of a basin. Using the multi-stage finite stretching model, the tectonic subsidence history and the thermal history have been obtained for 12 artificial wells, which were constructed on basis of one seismic profile newly acquired in the study area. Two stages of rifting during the time periods of 49-33.9 Ma and 33.9-23 Ma can be recognized from the tectonic subsidence pattern, and there are two phases of heating processes corresponding to the rifting. The reconstructed average basal paleo-heat flow values at the end of the rifting events are ~70.5 and ~94.2 mW/m2 respectively. Following the heating periods, the study area has undergone a persistent thermal attenuation phase since 23 Ma and the basal heat flow cooled down to ~71.8-82.5 mW/m2 at present. |
| 中文摘要: |
| 构造-热演化史研究对了解盆地的构造演化过程以及油气资源潜力具有十分重要的意义。荔湾凹陷位于南海北部珠江口盆地深水区，面积约为4000km2。受当今世界海洋深水区油气勘探成功的激励与启发，基于最新获得的地震测线资料，我们在本文中构建了12口人工井，并运用多期-有限拉张模型模拟了他们的构造沉降史以及热历史，以期初步探索荔湾凹陷的构造-热演化过程。研究结果表明：49Ma以来，荔湾凹陷经历了两期裂陷及对应的热流升高过程。从49Ma到33.9Ma，平均基底热流升高到~70.5mW/m2；从33.9到23Ma，平均基底热流升高到~94.2mW/m2。23Ma以后，荔湾凹陷进入热衰减期，基底热流持续降低。研究区现今基底热流约为~71.8-82.5mW/m2。 |
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