构造煤地球物理测井定量判识研究

为定量判识构造煤并获取构造煤的高精度厚度信息，以岩石物理与测井地质应用技术为指导，研究了构造煤的地球物理特征。结果表明：与原生结构煤相比，构造煤在地球物理测井曲线上通常表现为低电阻率、高声波时差、低密度、井径扩径、补偿中子值可能增大等特征。基于岩石物理研究结果，提出利用孔隙结构指数m作为构造煤定量判识指标，阐明了用测井资料通过Archie公式求取构造煤孔隙结构指数m的方法与定量判识可行性，将该方法在两个煤田进行实际应用，效果表明：用孔隙结构指数m定量判识构造煤并确定厚度是可行的，能够大大减小定性判识误差。

Quantitative identification of deformed coals by geophysical logging

In order to quantitatively identify and obtain high precision thickness，geophysical characteristics of deformed coal were studied with rock physics theory and logging applied technology.The results show that，compared with undeformed coal，deformed coal has low resistivity，high interval transit time，low bulk density，expanding well diameter，probability increasing neutron porosity in the geophysical logging curve.Based on the rock physics results，the porous structure exponent m was proposed as the quantitative identification index of deformed coal，and illustrated how to calculate with logging curves by Archie’s formula and the method’s feasibility.After the method was used to identify the deformed coal based on the practical logging data from two coalfield，the application results show that it is effective to use the porous structure exponent to identify the deformed coal and determine its thickness，and the method can greatly reduce the error of the qualitative identification.