Geothermal investigation of the thickness of gas hydrate stability zone in the north continental margin of the South China Sea
-
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。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.
-
Key words:
- gas hydrate /
- thickness of stability zone /
- heat flow /
- continental margin /
- South China Sea
-
Birchwood R, Dai Jianchun, Shelander D, et al. 2010. Developments in gas hydrates. Oilfield Review, 22(1):18-33 Bishnoi P R, Dholabhai P D. 1999. Equilibrium conditions for hydrate formation for a ternary mixture of methane, propane and carbon dioxide, and a natural gas mixture in the presence of electrolytes and methanol. Fluid Phase Equilibria, 158-160:821-827 Chen Duofu, Li Xuxuan, Xia Bin. 2004. Distribution features of gas hydrate stable zones and resource prediction of the Qiongdongnan Basin in the South China Sea. Chinese Journal of Geophysics, 47(3):548-555 Davis E E, Hyndman R D, Villinger H. 1990. Rates of fluid expulsion across the northern Cascadia Accretionary prism:constraints from new heat low and multichannel seismic reflection data. Journal of Geophysical Research, 95(B6):8869-8889 Dickens G R, Quinby-Hunt M S. 1994. Methane hydrate stability in seawater. Geophysical Research Letters, 21(19):2115-2119 Feng Zhiqiang, Feng Wenke, Xue Wanjun, et al. 1996. Evaluation of marine geological hazards and marine engineering geological assessment of the northern South China Sea (in Chinese). Nanjing:Hohai University Press, 82-115 Ge Qian, Wang Jiasheng, Xiang Hua, et al. 2006. Computation of thickness of gas hydrate stability zone and potential volume of gas hydrate in South China Sea. Earth Science-Journal of China University of Geosciences (in Chinese), 31(2):245-249 Golmshtok A Y, Duchkov A D, Hutchinson D R, et al. 2000. Heat flow and gas hydrates of the Baikal Rift Zone. International Journal of Earth Sciences, 89(2):193-211 Grevemeyer I, Villinger H. 2001. Gas hydrate stability and the assessment of heat flow through continental margins. Geophysical Journal International, 145(3):647-660 Handa Y P. 1990. Effect of hydrostatic pressure and salinity on the stability of gas hydrates. The Journal of Physical Chemistry, 94(6):2652-2657 He Lijuan, Wang Kelin, Xiong Liangping, et al. 2001. Heat flow and thermal history of the South China Sea. Physics of the Earth and Planetary Interiors, 126(3-4):211-220 He Lijuan, Wang Jiyang, Xu Xing, et al. 2009. Disparity between measured and BSR heat flow in the Xisha Trough of the South China Sea and its implications for the methane hydrate. Journal of Asian Earth Sciences, 34(6):771-780 Holbrook W S, Hoskins H, Wood W T, et al. 1996. Methane hydrate and free gas on the Blake ridge from vertical seismic profiling. Science, 273(5283):1840-1843 Huang Duzi, Fan Shuanshi. 2005. Measuring and modeling thermal conductivity of gas hydrate-bearing sand. Journal of Geophysical Research, 110(B1):B01311, doi: 10.1029/2004JB003314 Jin Chunshuang, Wang Jiyang, Wang Yongxin, et al. 2004. Geothermal field characteristics in the areas of gas hydrates distribution. Chinese Journal of Geology (in Chinese), 39(3):416-423 Jin Chunshuang, Wang Jiyang, Zhang Guangxue. 2005. Factors affecting natural gas hydrate stability zone in the South China Sea. Mineral Deposits (in Chinese), 24(4):388-397 Kim Y J, Yun T S. 2013. Thermal conductivity of methane hydrate-bearing Ulleung basin marine sediments:laboratory testing and numerical evaluation. Marine and Petroleum Geology, 47:77-84 Klauda J B, Sandler S I. 2005. Global distribution of methane hydrate in ocean sediment. Energy & Fuels, 19(2):459-470 Lei Xiao, Liu Shaowen, Jiang Xuehong, et al. 2013. Thermal regime in the continental margins:An overview. Progress in Geophysics (in Chinese), 28(2):998-1012 Li Yamin, Luo Xianhu, Xu Xing, et al. 2010. Seafloor in-situ heat flow measurements in the deep-water area of the northern slope, South China Sea. Chinese Journal of Geophysics (in Chinese), 53(9):2161-2170 Li Chunfeng, Xu Xing, Lin Jian, et al. 2014. Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349. Geochemistry, Geophysics, Geosystems, 15(12):4958-4983 Liu Changling, Ye Yuguang, Meng Qingguo, et al. 2012. The characteristics of gas hydrates recovered from Shenhu area in the South China Sea. Marine Geology, 307-310:22-27 Lüdmann T, Wong H K, Wang Pinxian. 2001. Plio-quaternary sedimentation processes and neotectonics of the northern continental margin of the South China Sea. Marine Geology, 172(3-4):331-358 Luo Min, Wang Hongbin, Yang Shengxiong, et al. 2013. Research advancement of natural gas hydrate in South China Sea. Bulletin of Mineralogy, Petrology and Geochemistry (in Chinese), 32(1):56-69 Makogon Y F. 2010. Natural gas hydrates-a promising source of energy. Journal of Natural Gas Science and Engineering, 2(1):49-59 Markl R G, Bryan G M, Ewing J I. 1970. Structure of the Blake-Bahama outer ridge. Journal of Geophysical Research, 75(24):4539-4555 Matsumoto R, Ryu B J, Lee S R, et al. 2011. Occurrence and exploration of gas hydrate in the marginal seas and continental margin of the Asia and Oceania region. Marine and Petroleum Geology, 28(10):1751-1767 Mi Lijun, Yuan Yusong, Zhang Gongcheng, et al. 2009. Characteristics and genesis of geothermal field in deep-water area of the northern South China Sea. Acta Petrolei Sinica (in Chinese), 30(1):27-32 Milkov A V. 2004. Global estimates of hydrate-bound gas in marine sediments:how much is really out there?. Earth-Science Reviews, 66(3-4):183-197 Nissen S S, Hayes D E, Bochu Y, et al. 1995. Gravity, heat flow, and seismic constraints on the processes of crustal extension:Northern margin of the South China Sea. Journal of Geophysical Research, 100(B11):22447-22483 Ruppel C D. 2011. Methane hydrates and contemporary climate change. Nature Education Knowledge, 3(10):29 参考文献 Sain K, Rajesh V, Satyavani N, et al. 2011. Gas-hydrate stability thickness map along the Indian continental margin. Marine and Petroleum Geology, 28(10):1779-1786 Sha Zhibin, Guo Yiqun, Yang Muzhuang, et al. 2009. Relation between sedimentation and gas hydrate reservoirs in the northern slope of South China Sea. Marine Geology & Quaternary Geology (in Chinese), 29(5):89-98 Shi Xiaobin, Qiu Xuelin, Xia Kanyuan, et al. 2003. Characteristics of surface heat flow in the South China Sea. Journal of Asian Earth Sciences, 22(3):265-277 Shipley T H, Houston M H, Buffler R T, et al. 1979. Seismic evidence for widespread possible gas hydrate horizons on continental slopes and rises. AAPG Bulletin, 63(12):2204-2213 Shyu C T, Hsu S K, Liu C S. 1998. Heat flows off Southwest Taiwan:measurements over mud diapirs and estimated from bottom simulating reflectors. TAO, 9(4):795-812 Sloan E D. 1998. Clathrate Hydrates of Natural Gases. 2nd ed. New York:Marcel Dekker Inc, 1-628 Song Haibin, Jiang Weiwei, Zhang Wensheng, et al. 2002. Progress on marine geophysical studies of gas hydrates. Progress in Geophysics (in Chinese), 17(2):224-229 Sun Zhen, Zhou Di, Zhong Zhihong, et al. 2006. Research on the dynamics of the South China Sea opening:evidence from analogue modeling. Science in China Series D:Earth Sciences, 49(10):1053-1069 Tang Xiaoyin, Hu Shengbiao, Zhang Gongcheng, et al. 2014. Geothermal characteristics and hydrocarbon accumulation of the Northern Marginal Basins, South China Sea. Chinese Journal of Geophysics, 57(2):572-585 Waite W F, deMartin B J, Kirby S H. et al. 2002. Thermal conductivity measurements in porous mixtures of methane hydrate and quartz sand. Geophysical Research Letters, 29(24):82-1-82-4 Wang Hongbin, Liang Jin, Gong Yuehua, et al. Estimation of the heat flow in the northern of the South China Sea based on the seismic data of gas hydrate. Geoscience (in Chinese), 19(1):67-73 Wang Zhenfeng, Shi Xiaobin, Yang Jun, et al. 2014. Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin. Acta Oceanologica Sinica, 33(12):107-117 Wang Shuhong, Song Haibin, Yan Wen. 2005a. The change of external conditions effects on the phase equilibrium curve of gas hydrate and the thickness of hydrate stability zone. Progress in Geophysics (in Chinese), 20(3):761-768 Wang Lifeng, Wang Jiyang. 2005. Geothermal background for gas hydrates formation and distribution in the SW Pacific region. Quaternary Sciences (in Chinese), 25(5):640-644 Wang Lifeng, Zhao Kebin, Huang Xin. 2009. A study on geothermics and occurrence of gas hydrates in the northern slope of the South China Sea. Petroleum Geology & Experiment (in Chinese), 31(1):58-62 Wei Wei, Zhang Jinhua, Wei Xinghua, et al. 2012. Resource potential analysis of natural gas hydrate in South China Sea. Progress in Geophysics (in Chinese), 27(6):2646-2655 Wu Shiguo, Zhang Guangxue, Guo Changsheng, et al. 2004. Geological constraint on the distribution of gas hydrate in the Dongsha continental slope of South China Sea. Acta Petrolei Sinica (in Chinese), 25(4):7-12 Wu S, Zhang G, Huang Y, et al. 2005. Gas hydrate occurrence on the continental slope of the northern South China Sea. Marine and Petroleum Geology, 22(3):403-412 Wu Bihao, Zhang Guangxue, Zhu Youhai, et al. 2003. Progress of gas hydrate investigation in China offshore. Earth Science Frontiers (in Chinese), 10(1):177-189 Xu Xing, Li Yamin, Luo Xianhu, et al. 2012. Comparison of different-type heat flows at typical sites in natural gas hydrate exploration area on the northern slope of the South China Sea. Chinese Journal of Geophysics (in Chinese), 55(3):998-1006 Xu Wei, Qiu Nansheng, Sun Changyu, et al. 2010. The distribution characteristics of the thickness of gas hydrate stability zone in South China Sea. Geoscience (in Chinese), 24(3):467-473 Xu Xing, Shi Xiaobin, Luo Xianhu, et al. 2006. Heat flow measurements in the Xisha Trough of the South China Sea. Marine Geology & Quaternary Geology (in Chinese), 26(4):51-58 Xue Wanjun, Huo Chunlan. 1991. Late Quaternary paleoclimate and paleoceanography in the middle and northern South China Sea. Research of Geological South China Sea (in Chinese), 4:1-96 Yamano M, Uyeda S, Aoki Y, et al. 1982. Estimates of heat flow derived from gas hydrates. Geology, 10(7):339-343 Yang Chuanheng, Du Xu, Pan Heshun, et al. 2000. Advances in worldwide deep water hydrocarbon exploration and oil and gas exploration potential in the northern continental slope in South China Sea. Earth Science Frontiers (in Chinese), 7(3):247-256 Yu Xinghe, Wang Jianzhong, Liang Jinqiang, et al. 2014. Depositional accumulation characteristics of gas hydrate in the northern continental slope of South China Sea. Acta Petrolei Sinica (in Chinese), 35(2):253-264 Yu Xinghe, Zhang Zhijie, Su Xin, et al. 2004. Primary discussion on accumulation conditions for sedimentation of gas hydrate and its distribution in South China Sea. Earth Science Frontiers (in Chinese), 11(1):311-315 Yuan Yusong. 2007. Tectonothermal evolution and source rock maturation history in deep water area of the northern margin of the South China Sea[dissertation]. Beijing:Institute of Geology and Geophysics, Chinese Academy of Sciences Zatsepina O Y, Buffett B A. 1997. Phase equilibrium of gas hydrate:implications for the formation of hydrate in the deep sea floor. Geophysical Research Letters, 24(13):1567-1570 Zhang Yi, He Lijuan, Wang Jiyang, et al. 2011. Heat flow pattern, base of methane hydrates stability zones and BSRs in Shenhu Area, northern South China Sea. Acta Oceanologica Sinica, 30(1):59-67 Zhang Diqiu, Li Zhiping, Chen Jiawei. 2012. New advancements in natural gas hydrate exploration and development. Chinese Journal of Geology (in Chinese), 47(2):561-573 Zhang Hongtao, Zhang Haiqi, Zhu Youhai. 2007. Gas hydrate investigation and research in China:present status and progress. Geology in China (in Chinese), 34(6):953-961 Zhang Guangxue, Zhu Youhai, Liang Jinqiang, et al. 2006. Tectonic controls on gas hydrate deposits and their characteristics. Geoscience (in Chinese), 20(4):605-612
点击查看大图
计量
- 文章访问数: 1127
- HTML全文浏览量: 53
- PDF下载量: 1172
- 被引次数: 0