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天然气水合物稳定带是天然气水合物成藏的必要条件,气体组分、地温梯度、多年冻土层厚度是影响稳定带的主要因素.本文以青海木里煤田钻探得到的天然气水合物实物样品的气体组分为依据,利用Sloan的天然气水合物相平衡程序(CSMHYD),计算得到该区天然气水合物温压相平衡曲线;通过对煤田钻孔简易测温数据的处理,获得冻土层厚度和冻土层下地温梯度等重要数据.基于上述基础数据,提出利用计算机编程模拟计算单孔天然气水合物稳定带参数的方法,根据单孔数据首次编制获得木里煤田天然气水合物稳定带底界埋深等值线图.研究结果表明:木里煤田85个钻孔的天然气水合物稳定带厚度均值达1 000m,显示本区具有天然气水合物赋存的广阔空间;稳定带底界埋深等值线展示了水合物温压平衡区间的平面分布特征,底界埋深超过1 500m的聚乎更矿区南部、哆嗦公马矿区中部和雪霍立矿区东部,是天然气水合物赋存的有利区域.
Gas hydrate stability zone is a necessary condition for natural gas hydrate accumulation, gas composition, geothermal gradient and permafrost thickness are the main factors affecting the stability zone.In this paper, the physical gas hydrate samples Based on the gas composition, Sloan natural gas hydrate phase balance program (CSMHYD) was used to calculate the temperature-pressure-phase equilibrium curve of natural gas hydrate in this area. Through the simple temperature measurement data of borehole drilling, the thickness of frozen soil layer and Based on the above basic data, a method of simulating the parameters of single-hole natural gas hydrate stability zone by computer programming is proposed. Based on the single-hole data, the method of calculating the parameters of the stable zone of gas hydrate in MuLi coalfield Deep contour map.The results show that the average gas hydrate stability zone thickness of 85 boreholes in the Muli coalfield reaches 1 000 m, which shows that this area has a vast space for natural gas hydrate to deposit. Line shows the hydrate temperature and pressure balance interval of the plane distribution characteristics, the bottom depth of more than 1,500 m of poly-more mining area south, shivering stallion mine Huo Li snow in central and eastern mining area, gas hydrate is a favorable area.