南海北部陆坡天然气水合物的沉积物孔隙水地球化学研究进展

发布时间：2018-04-30 07:25

本文选题：天然气水合物 + 孔隙水　；参考：《海洋地质与第四纪地质》2017年05期

【摘要】：孔隙水地球化学异常是天然气水合物勘探的重要工具之一,南海北部陆坡地区拥有良好的天然气水合物成藏潜力,孔隙水地球化学异常在南海的天然气水合物勘探中发挥了重要作用。其中与水合物直接相关的氯离子含量异常被用于识别神狐及东沙海域钻探区的水合物层和计算水合物饱和度。除直接指标外,浅表层沉积物中的硫酸盐含量及其他与早期成岩作用有关的地球化学异常作为间接指标可用于水合物的找矿预测,研究者们通过对硫酸盐还原过程的判别、硫酸盐甲烷接触界面的计算等方面对南海北部陆坡不同海域的沉积物甲烷通量进行了评估,预测出水合物可能的成藏区域。其他如碘含量、氧化还原敏感元素、氯同位素、地球化学模型等新的地球化学指标和计算机手段也被应用于南海北部陆坡区水合物成藏研究并取得了不错的成效。
[Abstract]:Pore water geochemical anomaly is one of the important tools for gas hydrate exploration. The northern slope of the South China Sea has a good potential for gas hydrate accumulation. Pore water geochemical anomalies play an important role in gas hydrate exploration in the South China Sea. The chloride ion anomaly which is directly related to hydrate is used to identify the hydrate layer and calculate hydrate saturation in the drilling area of Shenhu and Dongsha. In addition to direct indicators, sulfate content in shallow surface sediments and other geochemical anomalies related to early diagenesis can be used as indirect indicators for the prediction of hydrates. The methane fluxes in sediments from different sea areas on the northern slope of the South China Sea were evaluated from the calculation of the contact interface of sulphate methane, and the potential reservoir forming areas of hydrates were predicted. Other new geochemical indexes such as iodine content, redox sensitive elements, chlorine isotopes and geochemical models have also been applied to the study of hydrate accumulation in the northern slope of the South China Sea.
【作者单位】：南京大学地球科学与工程学院;南京大学南海协同创新中心;
【基金】：中国地质调查局南海天然气水合物资源勘查项目(DD20160211)
【分类号】：P618.13;P744.4

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