测井参数在准东煤田大井矿区一井田煤层及顶底板强度评价中的应用

Application of Logging Parameters in Coal Seam, Roof and Floor Strength Evaluation in No.1 Minefield, Dajing Mining Area, Eastern Junggar Coalfield

测井所计算出的岩体弹性强度ε值和RC非常近似,相关性也很好。大井矿区一井田利用声波测井及密度测井,获得岩石速度与密度参数,以此计算岩石强度参数。与24组岩样试验值比较,其绝对差值率为19.77%。计算发现在实验值小于20MPa时,测井计算的岩体强度值偏大;当试验值在20～30MPa之间时,测井计算的岩体强度值偏小;当试验值大于30MPa时,两者非常接近,但测井值偏小者居多。根据测井计算的岩石强度,对该井田B1煤层及其顶底板强度进行了评价,并绘制了B1煤层及其顶底板岩体强度分区图。

The rock mass elastic strength ~ estimated by well logging data is very close to RC and with good pertinence. In the No. 1 minefield, Dajing mining area using acoustic and density logs acquired rock velocity and density parameters, here by estimated rock strength parameters. As compared with testing results of 24 sets of rock samples, their absolute difference ratio is 19.77%. The estimating has found that when tested value 〈 20MPa, estimated value is on the high side; while between 20-30MPa is on low side; when 〉 30MPa, both results are very close, but estimated value on the low side is in the majority. Based on estimated rock strength, evaluated B1 coal seam and its roof and floor strengths in the minefield, and mapped their strength zoning plan.