| 南海西沙海槽6 Ma以来天然气水合物稳定带演化初探 |
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| 引用本文：金春爽,汪集旸,卢振权.2011.A tentative discussion on the evolution of the natural gas hydrates stable zone in Xisha Trough of South China Sea since 6 Ma B.P.[J].Mineral Deposits,30(1):156~162 |
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| 中文摘要:水深、海底温度、地温梯度是影响天然气水合物稳定带的重要因素。文章通过海平面变化、底栖有孔虫氧同位素、构造热演化资料分析了水深、海底温度、地温梯度的变化，进而探讨了南海西沙海槽地区6 Ma以来天然气水合物稳定带的演化。结果表明：南海西沙海槽地区6 Ma以来天然气水合物稳定带经历了稳定、缓慢减薄、快速增厚、小幅度变化和减薄的一个过程。海底温度的变化对天然气水合物稳定带厚度影响最大，热历史的影响次之，海平面变化的影响最小。 |
| 中文关键词:地质学 天然气水合物稳定带 演化 西沙海槽 南海 |
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| A tentative discussion on the evolution of the natural gas hydrates stable zone in Xisha Trough of South China Sea since 6 Ma B.P. |
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| Abstract:Based on the changes of sea level, oxygen isotope of benthic foraminifer and thermal evolution, this paper analyzed the changes of water depth, sea bottom temperature and geothermal gradient of Xisha Trough since 6Ma B.P., then predicted the evolution of the natural gas hydrates stable zone. The result shows that the natural gas hydrates stable zone has gone through stable stage, slowly attenuating stage, relatively quick incrassation stage, gently changing stage and quickly attenuating stage. The sea bottom temperature change has most strongly affected the natural gas stable zone, sea level variation has had the weakest influence and geothermal gradient has exerted the intermediate influence. |
| keywords:geology, Natural gas hydrate stability zone, evolution, Xisha Trough, the South China Sea |
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