Gas hydrate system and resource potential of the continental margin of the Bellingshausen Sea to the west coast of the Antarctic Peninsula
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摘要:
以别林斯高晋海陆缘地质环境、天然气水合物存在标志如BSR为线索，认为南极半岛别林斯高晋海陆隆上快速堆积体具有天然气水合物成藏的良好环境。根据ODP太平洋钻探计划178航次的钻孔、地震剖面等数据，从沉积、气源、热流场、成藏关键时间分析研究区域含天然气水合物的成藏条件，通过研究区天然气水合物综合异常图及综合成藏系统表，预测南极半岛别林斯高晋海陆缘天然气水合物成藏区域在陆隆快速堆积体7上，研究区的天然气水合物可能成藏的区域在地层单元Ⅰ和Ⅱ，年龄应是全新世到上新世晚期(0~2.1Ma)。运用体积法对其天然气水合物资源量进行计算，预测资源量较大，为今后南极区域天然气水合物的调查研究提供参考。
Abstract:Based on the geological environment of the continental margin of the Bellinsgauzen Sea and the presence of natural gas hydrate proxies, such as BSR and the rapid accumulation of sediments from the upper reaches, it is inferred that the region has excellent conditions for natural gas hydrate accumulation. According to the drilling data and seismic profiles of the Leg 178 of the ODP Pacific Drilling Program, formation conditions of natural gas hydrates in the study area are analyzed according to sedimentation, gas source, heat flow field and key time of accumulation. The accumulation conditions of natural gas hydrates are predicted by the comprehensive anomaly map and the comprehensive accumulation system table of the study area. It is predicted that the gas hydrate accumulation area along the sea margin off the Antarctic Peninsula is mainly located on the continental rise of Drift 7, most probably in the stratigraphic units Ⅰ and Ⅱ, from Holocene to late Pliocene (0~2.1 Ma). Volumetric method is used to calculate the amount of natural gas hydrate resources, which are very large. The results may provide a good reference to the future investigation and research of natural gas hydrates in the Antarctic region.
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Key words:
- ydrates system /
- resource potential /
- BSR /
- volume method /
- Antarctic Peninsula /
- Bellinsgauzen Sea
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表 1 别林斯高晋海域含水合物系统
Table 1. Integrated gas hydrate accumulation system of the Bellinsgauzen Sea
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表 2 南设得兰地陆缘沉积体7水合物资源量参数及结果
Table 2. Hydrate Resource Parameters and Results from South Shetland Land
参数 分布面积 水合物层厚度 孔隙率 饱和度 产气因子 赋存率 水合物资源总量 值 5000km2 150m 55% 5% 140 10% 2.89×1011m3
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