학술논문
氯化物指标在天然气水合物勘探中的应用研究综述 / Application of Chloride Indicator in Natural Gas Hydrate Exploration
Document Type
Academic Journal
Author
Source
油气藏评价与开发 / Reservoir Evaluation and Development. (1):71-78
Subject
Language
Chinese
ISSN
2095-1426
Abstract
氯化物浓度低值异常作为与天然气水合物赋存区密切相关的一种现象，在水合物勘探中的应用研究已经进行了数十年，取得了一些新的成果与认识。水合物地球化学勘探中氯化物浓度指标的作用主要体现在两个方面，一是通过连续取心分析，获取纵向上氯离子浓度分布特征，以此识别井孔天然气水合物潜在赋存层段；二是利用水合物赋存层段氯离子浓度信息，估算水合物饱和度。基于大量文献，对天然气水合物勘探中氯化物指标的研究与应用成果做了归纳与综合研究。总结了孔隙水氯离子浓度低值异常与天然气水合物赋存区之间的成因联系，通过实例分析了氯离子低值异常对天然气水合物的指示意义及其在水合物饱和度估算中的应用效果，讨论了该技术用于水合物赋存区识别与饱和度估算方面面临的主要挑战，提出了技术研究建议。
As a phenomenon closely related to gas hydrate occurrence, low concentration of chloride in the pore-water has been studied and applied for decades, and some achievements have been made in both theoretical and application aspects. The applica?tion of chloride indicator in natural gas hydrate exploration majorly focuses on 2 fields, that is, the recognition of gas hydrate con?centrated intervals of a well based on the vertical distribution characteristics of chloride concentration from the cores recovered con?tinuously from the wellbore, and the evaluation of gas hydrate saturation of the hydrate-bearing intervals according to chloride infor?mation. Based on a large amount of published data, the researches and application achievements of the chloride indicator used in exploring natural gas hydrate were summarize. By doing this, the relationship between the low chloride concentration anomaly de?tected in the pore water and the occurrence of natural gas hydrate has been analyzed; the significance of the low chloride concentra?tion anomaly in indicating gas hydrate occurrence and the application effectiveness of the low chloride anomaly in estimating gas hydrate saturation have been studied, revealing the latest research advances and main achievements of chloride indicator used in natural gas hydrate exploration; and finally, a few major problems relating to the application of chloride indicator in recognizing gas hydrate occurrence and estimating gas hydrate saturation have been discussed, and some advice has been proposed to the further development of the chloride indicator in gas hydrate geochemical exploration.
As a phenomenon closely related to gas hydrate occurrence, low concentration of chloride in the pore-water has been studied and applied for decades, and some achievements have been made in both theoretical and application aspects. The applica?tion of chloride indicator in natural gas hydrate exploration majorly focuses on 2 fields, that is, the recognition of gas hydrate con?centrated intervals of a well based on the vertical distribution characteristics of chloride concentration from the cores recovered con?tinuously from the wellbore, and the evaluation of gas hydrate saturation of the hydrate-bearing intervals according to chloride infor?mation. Based on a large amount of published data, the researches and application achievements of the chloride indicator used in exploring natural gas hydrate were summarize. By doing this, the relationship between the low chloride concentration anomaly de?tected in the pore water and the occurrence of natural gas hydrate has been analyzed; the significance of the low chloride concentra?tion anomaly in indicating gas hydrate occurrence and the application effectiveness of the low chloride anomaly in estimating gas hydrate saturation have been studied, revealing the latest research advances and main achievements of chloride indicator used in natural gas hydrate exploration; and finally, a few major problems relating to the application of chloride indicator in recognizing gas hydrate occurrence and estimating gas hydrate saturation have been discussed, and some advice has been proposed to the further development of the chloride indicator in gas hydrate geochemical exploration.