电极电位测井法在低阻高炭化无烟煤矿区的应用

Application of Electrode Potential Logging in Conductive Meta-Anthracite Mining Area

福建童子岩组含煤岩系,受后期构造及火成岩侵入的影响变质程度加深,物理化学性质发生变化,部分矿区的高炭化无烟煤煤层呈低阻。常规的电性参数视电阻率曲线除致密的细砂岩、火成岩及灰岩有明显的高阻异常反映外,煤与围岩无明显的电性差异,曲线几乎呈一条直线;自然电位参数曲线反映规律性也较差。而电极电位测井方法,对该类煤岩层的反映特征比较明显,从而弥补了该矿区测井电性参数曲线的不足。

Tongziyan Formation coal measures in Fujian were subjected to later stage tectonic movement and intrusive igneous mass and intensified metamorphic grade, physical and chemical properties were changed, part of meta-anthracite in the mining area became conductive. On the traditional electrical property parameter apparent resistivity curves, besides compact fine sandstone, igneous rock and limestone have obvious high-ohmic anomaly, there are no obvious electrical property difference between coal and wall rocks, the curve almost show itself a straight line; self-potential log also can hardly to reflect regularities.While the electrode potential logging has relatively obvious reflection to those coal and strata, thereby makes up for deficiency from other logging electrical property parameters in the mining area.