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黄陵矿区含煤地层中油、气共存,在巷道掘进和回采过程中均出现油、气异常涌出,影响煤炭安全开采。利用矿区测井资料,分析了煤层围岩延安组和延长组地层的岩性和储层电性特征,通过与邻近水层对比研究,估算围岩油气异常地层电阻增大率小于2,储层流体判别对比度低。选择了合适的测井解释模型,计算得出储层孔隙度较低,含油气饱和度低于30%,解释为含油水层。综合认为,矿区煤层围岩油气层属于含油气丰度较低的低电阻率油气储层。在此基础上,运用地质方法进行巷道掘进或回采前油气预测,可以指导矿井瓦斯抽放作业。
Oil and gas coexist in the coal-bearing strata in Huangling Mine Area. During the tunneling and recovery process, both oil and gas gush out abnormally, affecting the safe mining of coal. The lithology and reservoir electrical characteristics of the Yan’an and Yanchang formation strata in the coal seam are analyzed by using the well logging data. By comparing with the adjacent water layers, it is estimated that the increase rate of formation resistivity of anomaly hydrocarbon in the surrounding rock is less than 2, and the reservoir Low fluid discrimination contrast. The appropriate log interpretation model was chosen and the reservoir porosity was calculated to be less than 30%, interpreted as an oil-bearing aquifer. The comprehensive view is that the coalbed rock in the coalmine belongs to low resistivity oil and gas reservoirs with low oil and gas abundance. On this basis, the use of geological methods for roadway excavation or pre-recovery oil and gas prediction, can guide the mine gas drainage operations.