贵州刘家田井田测井曲线特征及在煤岩层对比中的应用

摘要

The coal-bearing strata Longtan Formation in the Liujiatian minefield are paralic deposits, containing 23~33 coal seams, in which, 11 mineable. Coal-bearing strata can be portioned into upper, middle and lower three sectors. The apparent resistivity, gamma-ray and gamma-gamma traces of upper and middle sectors have no obvious characteristics besides with abnormal reflection on coal seams. Apparent resistivity and gamma-gamma traces of middle sector coal seams Nos.12 and 17 present high amplitude box typed re-flection;while gamma-ray traces present low amplitude reflection. Apparent resistivity traces between coal seams Nos. 17 and 24 pres-ent thick high abnormal reflections. Gamma-ray traces of lower sector have 4~7 high amplitude abnormal reflections. Based on logging traces correlation of upper, middle and lower sectors, using marker bed, coal seam group characteristics carry out coal seams correla-tion can promote reliability of correlation greatly.%刘家田井田含煤地层龙潭组为海陆交互相沉积，含煤23~33层，可采煤层11层。含煤地层分上、中、下三段，上、中段视电阻率、自然伽马及伽马伽马曲线除了在煤层上呈异常反映外，其余地层测井曲线特征不明显；12、17号煤层视电阻率和伽马伽马曲线呈高幅值箱状反映，自然伽马曲线呈低幅值反映；视电阻率曲线在17号至24号煤层之间存在厚层高异常反映。下段自然伽马曲线有4~7处高幅值异常反映特征。在上、中、下段测井曲线特征对比基础上，利用标志层、煤组特征等对比法进行了煤层对比，大大提高了对比的可靠性。