| WANG Yanmin,LIU Shaowen,HAO Feifei,ZHAO Yunlong,HAO Chunyan. 2017. Geothermal investigation of the thickness of gas hydrate stability zone in the north continental margin of the South China Sea. Acta Oceanologica Sinica, 36(4):72－79 |
| Geothermal investigation of the thickness of gas hydrate stability zone in the north continental margin of the South China Sea |
| 南海北部大陆边缘天然气水合物稳定带厚度的地热学研究 |
| Received:December 19, 2015 Revised:May 05, 2016 |
| DOI：10.1007/s13131-017-1014-2 |
| Key words:gas hydrate thickness of stability zone heat flow continental margin South China Sea |
| 中文关键词: 天然气水合物 稳定带厚度 热流 大陆边缘 南海 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WANG Yanmin | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | LIU Shaowen | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210023, China
Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China | shaowliu@nju.edu.cn | | HAO Feifei | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | ZHAO Yunlong | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China | | | HAO Chunyan | School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210023, China
Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China | |
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| Abstract: |
| The exploration of unconventional and/or new energy resources has become the focus of energy research worldwide, given the shortage of fossil fuels. As a potential energy resource, gas hydrate exists only in the environment of high pressure and low temperature, mainly distributing in the sediments of the seafloor in the continental margins and the permafrost zones in land. The accurate determination of the thickness of gas hydrate stability zone is essential yet challenging in the assessment of the exploitation potential. The majority of previous studies obtain this thickness by detecting the bottom simulating reflectors (BSRs) layer on the seismic profiles. The phase equilibrium between gas hydrate stable state with its temperature and pressure provides an opportunity to derive the thickness with the geothermal method. Based on the latest geothermal dataset, we calculated the thickness of the gas hydrate stability zone (GHSZ) in the north continental margin of the South China Sea. Our results indicate that the thicknesses of gas hydrate stability zone vary greatly in different areas of the northern margin of the South China Sea. The thickness mainly concentrates on 200-300 m and distributes in the southwestern and eastern areas with belt-like shape. We further confirmed a certain relationship between the GHSZ thickness and factors such as heat flow and water depth. The thickness of gas hydrate stability zone is found to be large where the heat flow is relatively low. The GHSZ thickness increases with the increase of the water depth, but it tends to stay steady when the water depth deeper than 3 000 m. The findings would improve the assessment of gas hydrate resource potential in the South China Sea. |
| 中文摘要: |
| 随着世界能源的减少与短缺，寻找非常规能源或新能源已成为当前各国能源研究的重点。作为一种潜在的优质清洁能源，天然气水合物仅在低温高压的条件下稳定，它赋存于大陆边缘沉积物和高寒纬度冻土带中。水合物厚度是其资源潜力评价的关键参数，以往的相关研究多从地震剖面上判读BSR层来确定；水合物稳定状态与其温度和压力条件息息相关，从而为从地热学角度研究其厚度提供了一个新视角。本文根据南海北部大陆边缘最新的地热资料，结合相关计算方法，给出了该区域天然气水合物稳定带的厚度。研究表明，南海北部大陆边缘水合物的厚度变化较大，主体呈条带状分布在西南海盆和东部海域，且厚度主要集中在200m~300m。南海水合物稳定带厚度与热流、水深等存在相关关系。水合物稳定带厚度较大的区域，往往对应于热流值较低的区域。水合物稳定带厚度随水深增加而增加，但深水3000m后，则基本趋于稳定。本文的研究成果可为该南海北部大陆边缘的天然气水合物资源评价提供参考依据。 |
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