青海木里三露天井田天然气水合物调查研究新进展

自2008年首次发现天然气水合物以来，青海木里三露天井田的天然气水合物调查研究成为一个热点。近两年来，神华青海能源有限责任公司投资项目在三露天井田内开展天然气水合物调查评价工作，是该区最新的天然气水合物调查研究工作部署安排，目前取得了系列重要新进展。新进展主要表现为：(1)天然气水合物赋存特征研究取得了新认识；(2)对天然气水合物形成与分布的主要地质控制因素取得了新认识；(3)总结了天然气水合物成藏模式；(4)探索了地质、地球物理、地球化学、钻探等冻土区天然气水合物勘查方法，建立了钻探气测录井预判、地质标志识别、测井判识、室内鉴定等冻土区天然气水合物判定技术手段；(5)对天然气水合物资源量进行了估算并对其经济可采性进行了初步评价。综合认为，三露天天然气水合物资源目前不具备经济开采价值。

New Advance on Gas Hydrate Survey and Researchin Sanlutian of Muli,Qinghai

Since the first discovery of gas hydrate in 2008, gas hydrate survey and research has become a hot spot in Sanlutian of Muli, Qinghai. Within two years, Shenhua Qinghai Energy Development Co. Ltd. invested a project to carry out work on gas hydrate survey and evaluation in Sanlutian, which is the latest deployment and arrangement of gas hydrate survey and research in this area. At present a series of important new advances have been obtained. In this paper, these new advances are summarized: (1) new understanding on study of gas hydrate occurrence features; (2) new understanding on main geological controlling factors on gas hydrate formation and distribution; (3) gas hydrate geological formation pattern is summed up; (4) permafrost associated gas hydrate exploration methods such as geological, geophysical, geochemical and drilling methods are explored, and permafrost associated gas hydrate defining technical means such as pre-defining means by gas-logging while drilling, geological mark-recognition means, wire logging distinction means, indoor analytical identification means are established; (5) gas hydrate resource is estimated and its economical exploitation is preliminarily evaluated, which comprehensively suggests that gas hydrate resource is not economically exploitable in Sanlutian in the present.