黄陵矿区煤层围岩油气测井识别研究
Study on Logging Recognition for Coal Seam Surrounding Rock Oil and Gas in Huangling Coal Mining Area
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摘要: 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。Abstract: Oil and gas coexistence in coal bearing strata has an effect on the coal mining when these are poured out in the process of roadway excavation and mining in Huangling Mining Area. The lithology and electrical characteristics of the reservoir about Yan'an and Yanchang strata was analyzed using the data of well logging. The increasing rate of resistivity about surrounding rock is less than 2 compared with adjacent water layer, and the contrast of reservoir fluid is not obvious. The reservoir porosity is low and the hydrocarbon saturation is lower than 30%, which calculated by logging interpretation model. The hydrocarbon strata are identified as low resistivity hydrocarbon strata and its hydrocarbon abundance is also low. On this basis, the prediction of hydrocarbon distribution can be made using geological methods before the roadway excavation and mining; therefore it can guide the mine gas drainage operation.
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