摘要
建立工作面高精度地质模型是实现智能开采的基础,通过综合物探技术对工作面内煤层顶底板高程和隐伏构造展布情况进行全面探测,可为地质模型提供基础数据。以国家能源集团金凤煤矿011815工作面为研究对象,在工作面两巷按照间隔50 m、孔深80 m,垂直煤壁顺煤层方向施工钻孔30个,通过钻孔地质雷达剖面结合钻孔测斜和自然伽马测井数据进行钻孔轨迹上的煤层界面预测。将所测煤层顶底板数据与三维地震数据融合并进行高分辨的地质统计学反演,精细地刻画整个工作面范围内的煤层厚度及其顶底板岩性。在隐伏构造探查方面,以槽波地震透射+反射联合勘探所解释的构造异常为基础,依据地质雷达钻孔的自然伽马测井成果,推测钻孔钻进方向上的岩性变化,并通过钻孔测斜数据准确定位断层位置,实现对槽波异常区的精细解释,确定了工作面内隐伏断层的延展方向和落差情况。工作面回采后对模型进行了精度验证,工作面开切眼长度300 m,施工测量点20个,将实测剖面与模型剖面对比发现,地质模型预测的煤层底板高程最小误差0.061 m,平均误差0.503 m;模型煤厚最小误差0.040 m,平均误差0.242 m。基于工程实践结果表明:采用综合物探技术能够提供高精度的煤层界面和隐伏构造数据,是构建工作面高精度地质模型的重要技术手段。
Establishing a high-precision geological model of the working face is the basis for achieving intelligent mining,using integrated geophysical prospecting technology to detect the elevation of the roof and floor of the coal seam and the distribution of hidden geological structures within the working face could provide basic data for geological modeling.Taking the 011815 working face of Jinfeng Coal Mine of China Energy Investment Group as the research object,30 boreholes were drilled in two roadways of working face with an interval of 50 m and hole depth of 80 m,the boreholes were perpendicular to the coal wall and the direction was samed with the coal seam inclination angle.The coal seam interface prediction on the borehole trajectory was conducted using borehole geological radar profiles combined with borehole inclinometry and natural gamma-ray logging result.Fused with three-dimensional seismic data,the measured coal seam roof and floor data was conducted for high-resolution geostatistical inversion to accurately depict the coal seam thickness and lithology within the entire working face range.In the exploration of hidden geological structures,based on the anomalies explained by the joint exploration of in-seam seismic(ISS)transmission and reflection methods,and according to the natural gamma-ray logging results of geological radar drilling,the lithological changes in the drilling direction of the borehole were inferred,and the fault layer position was accurately located through the borehole inclinometer data,achieving precise interpretation of ISS anomaly areas,and determining the extension direction and fall of hidden faults in the working face.After the mining of the working face,the accuracy of the model was verified.The length of open-off cut in the working face was about 300 m with 20 survey points.Comparing the measured profile with the model cutting profile,it was found that the minimum error of the coal seam floor elevation predicted by geological model was 0.061 m,and the average error was 0.503 m;the minimum error of coal thickness predicted by geological model is 0.040 m,and the average error was 0.242 m.Based on the results of engineering practice,it is showed that the integrated geophysical exploration technology can provide high-precision data on coal seam interfaces and hidden geological structures,and it is an important measurement method for constructing high-precision geological models of working faces.
作者
赵俊杰
赵明军
张铁聪
贾瑞杰
刘兴伟
ZHAO Junjie;ZHAO Mingjun;ZHANG Tiecong;JIA Ruijie;LIU Xingwei(Jinfeng Coal Mine,China Energy Ningxia Coal Industry Co.,Ltd.,Wuzhong,Ningxia 751100,China;Beijing Longruan Technologies Co.,Ltd.,Haidian,Beijing 100080,China)
出处
《中国煤炭》
2023年第7期89-101,共13页
China Coal
关键词
综合物探
槽波勘探
钻孔地质雷达
地质统计学反演
自然伽马
工作面地质模型
integrate geophysical exploration
ISS
borehole geological radar
geostatistical inversion
nature gamma-ray
geological model of working face
