测井方法在青海木里煤田冻土研究中的应用

研究表明冻土的电阻率为非冻土的3倍,常规测井参数可用于冻土层的综合解释,而井温曲线的＂U＂字型与＂L＂字型不但可以划分不同性质的冻土层,而且能够准确的解释其冻土厚度。通过分析聚乎更、江仓、热水三个矿区的30个测温孔,发现其井田北部和南部区域,多年冻土层均有增厚的趋势,底界从北到南逐渐加深。对江仓矿区的长期观测及矿井开拓,验证了多年冻土层的总体变化范围与所获测井成果基本一致。根据对木里煤田冻土的研究,发现测井解释的多年冻土层厚度一般小于其真厚度,而季节性冻土层的解释厚度要大于其真实厚度。

Application of Well Logging in Frozen Earth Researches in Muri Coalfield, Qinghai

Studies shown that the resistivity of frozen earth is 3 times of non-frozen earth;conventional well logging parameters can be used in frozen earth layer comprehensive interpretation.The "U" type and "L" type well temperature curves can not only divide different nature frozen earth layers,but also can interpret frozen earth thickness correctly.Through analyses of 30 temperature measuring boreholes in Juhugeng,Jiangcang and Reshui 3 mining areas have found that in north and south areas of the minefield,perennial frozen earth layers have a trend of thickening,bottom boundary getting deeper from north to south.Through Jiangcang mining area long-term observation and mine development,proved that the overall range of perennial frozen earth variation is basically accord with obtained well logging results.Based on frozen earth study in Muri coalfield has found that the logging interpreted perennial frozen earth layer thickness generally less than its true thickness,while the interpreted seasonal frozen earth layer thickness greater than its true thickness.