论文部分内容阅读
在海洋天然气水合物的勘查与研究中地球化学方法发挥了重大作用。利用海洋沉积物孔隙水中各种离子含量和同位素异常可以有效示踪天然气水合物的存在, 其中Cl-浓度异常、SO42-浓度梯度和氧同位素组成异常已成为指示天然气水合物存在的灵敏示踪剂。通过对比有和没有天然气水合物存在的海域浅表层沉积物中孔隙水的NH4+和HPO42-含量, 发现有天然气水合物区的孔隙水中NH4+和HPO42-浓度明显偏高, 且存在与SO42-类似的浓度梯度曲线, 认为孔隙水中NH4+和HPO42-浓度异常有可能成为一种新的地球化学示踪剂, 指示天然气水合物的存在; 探讨了引起孔隙水中NH +和HPO 2-浓度异常的可能机理及精确测定这些离子含量的方法。
Geochemical methods have played a significant role in the exploration and research of marine gas hydrates. The use of various ion concentrations and isotopic anomalies in the pore water of marine sediments can effectively trace the existence of gas hydrates. Cl- concentration anomalies, SO42- concentration gradients and oxygen isotopic composition anomalies have become sensitive tracers for the presence of gas hydrates . By comparing the NH4 + and HPO42- contents of pore water in surface sediments with and without gas hydrate, it is found that the concentrations of NH4 + and HPO42- in pore water of gas hydrate region are obviously higher and similar to that of SO42- Concentration gradient curve, it is considered that abnormal NH4 + and HPO42- concentrations in pore water may become a new geochemical tracer to indicate the existence of gas hydrate. The possible mechanism of abnormal NH + and HPO 2- concentrations in pore water is discussed. Accurate determination of the content of these ions.