国外海域天然气水合物资源量评价方法对我国的启示
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摘要
天然气水合物资源量评价结果关系着对水合物资源价值、环境影响和潜在危害等科学问题的认识,是天然气水合物资源勘探开发工作中首要且最重要的内容。水合物资源量评价方法的选择、改进和发展决定了资源评价工作的质量和结果的可信度。通过分析国内外现有水合物资源量评价方法,明确了水合物资源量的含义(资源量/储量);依据成藏和生烃2种不同的评价思路,总结了4种评价方法;探讨了国外海域水合物资源量评价经验对我国的启示,认为通过掌握水合物成藏规律,采用基于生烃思路的方法,可以整体把握影响因素变化趋势,从而获取有效区域评价参数;通过结合已有地震、测井和钻井资料,采用基于成藏思路的方法,可以精细刻画各目的层的构造和沉积特征,增加资源量评价结果的可信度。
Resource assessment of gas hydrates is a basic requirement to hydrate exploration.It concerns not only the future energy supply,but also the possible impacts on global climate change and natural geohazards the exploration may induce.The selection,improvement and development of appropriate methods remain critical for the improvement of the quality and credibility of the assessment results.Based on the review of concerned researches abroad and at home,we discussed in this paper the definition of the gas hydrate resources and reserves.4 methods were summarized according to the principles of gas hydrate generation and accumulation models.Also discussed are the experiences accumulated so far in gas hydrate resource assessment and their implications for China.The study suggests that the assessment should be done upon a comprehensive understanding of the generation and accumulation of gas hydrate and the changing trends of concerned factors so as to obtain the effective assessment parameters.All the available information of geophysics,logging and well data should be fully used to define fine structures and depositional characteristics of the exploration targets for improvement of the credibility of the assessment results.
引文
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