Due to the uneven basement of peat swamps in the coal-forming period and the change of geological environments,com-plex conditions such as pinch-out and bifurcation are often observed in coal seams in relatively large geological areas,which affect the mining design.In order to locate the boundary and distribution position of coal seams efficiently and accurately,a three-dimensional geological modeling method based on geostatistics and a symbolic matrix was proposed.Through the symbolic matrix,the coal seam and non-coal seam data were discretized according to a certain degree of accuracy.The pan-Kriging method was used to determine the thickness of the planar coal seam.The inverse distance weighting method was adopted to estimate the symbolic distance function value of each grid.The coal seam was accurately located by the local window,and the intercept of the distance function matching the thickness of the coal seam was determined,so as to established the three-dimensional geological model of the coal seam.The influence of the intercept of distance function on the accuracy of the coal seam was also discussed,and that of sliding vertical window size and coal seam position on coal seam connectivity in modeling results was analyzed.The results show that the modeling method can quickly model complex conditions such as coal seam pinch-out and bifurcation,and it can be used to construct large-scale regional geological models to a certain extent.The method has a high degree of automation and can be applied to coal seam mining design and resource assessment.
关键词
尖灭分叉煤层/地质统计学/符号矩阵/三维地质建模
Key words
pinching out bifurcated coal seam/geostatistics/symbolic matrix/3D geology modeling
维普
万方数据