Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea
文献类型：期刊论文
| 作者 | Shi XiaoBin2,3; Wang LiFang4,5; Ren ZiQiang1; Pei JianXiang4,5; Shen YongQiang1; Shi DeFeng4,5; Liu Kui1; Zhao Peng1; Yan AnJu4,5 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2020 |
| 卷号 | 63期号:7页码:2682 |
| 关键词 | Liyue block Nansha Islands Source rock maturity Heat flow Thermal regime |
| DOI | 10.6038/cjg2020N0409 |
| 英文摘要 | To further understand the Cenozoic thermal regime of the Liyue Basin, based on crustal stretching factor analyses, we used a numerical model of coupled geothermal processes, lithosphere thinning and depositional processes to reconstruct the tectono-thermal evolutional histories of eight backbone profiles in the Liyue basin, and analyzed the thermal evolution features in the main structural units and their influence factors. The results show that, Liyue basin was greatly extended and thinned during the synrift phase, and the crustal stretching factors are generally larger than 1. 8 in most regions of its sags; During the synrift phase, heat flow increased generally with time, and at the end of the synrift phase, seafloor heat flow were as high as about 70 similar to 80 mW . m(2), and heat flow in basement high regions was generally higher than heat flow in sag regions. During the postrift phase, due to deposition and thermal relaxation, heat flow decreased gradually to 65 similar to 70 mW . m(2) at present in the regions where reef bodies were not developed continuously, while in the SW and NW regions of the basin, heat flow becomes higher due to recent magmatic intrusion. Seafloor heat flow and thermal gradient in reef body developing areas are quite low, and even negative due to heat exchange between the upper part of reef bodies and the surrounding low temperature seawater. Further analyses suggest that, the thermal regime of the Liyue basin results mainly from intense lithospheric thinning, and other local influence factors such as recent magmatic intrusion, basement topography, sedimentation and seafloor topography. In addition, the thermal regime in the reef body developing area has been influenced greatly by the heat exchange between the upper part of reef bodies and the surrounding low temperature seawater. The oil and gas threshold depth and temperature are 2000 similar to 2500 mbsf and 90 similar to 110 degrees C in the central regions of the sags, respectively, which are slightly larger than the threshold depth and temperature in the surrounding basement rise area. In the reef body developing area, due to the heat exchange between overlying reef bodies and surrounding seawater, the thermal maturity of the underlying source rocks is much lower, and the oil and gas threshold depth are obviously larger than the threshold depth in the central regions of the sags. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18536]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.CNOOC Ltd, Zhanjiang Branch, Zhanjiang 524057, Guangdong, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 3.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Peoples R China 4.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 510301, Peoples R China 5.CNOOC, Hainan Energy Ltd, Haikou 570100, Hainan, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi XiaoBin,Wang LiFang,Ren ZiQiang,et al. Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(7):2682, 2696. |
| APA | Shi XiaoBin.,Wang LiFang.,Ren ZiQiang.,Pei JianXiang.,Shen YongQiang.,...&Yan AnJu.(2020).Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(7),2682. |
| MLA | Shi XiaoBin,et al."Cenozoic tectono-thermal evolution features and influence factors of the Liyue basin, South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.7(2020):2682. |
入库方式： OAI收割
来源：南海海洋研究所
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