Three-dimensional Geological Modeling of Pinch out Bifurcation Coal Seam:Method Based on Geostatistics and Symbolic Matrix
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.
pinching out bifurcated coal seamgeostatisticssymbolic matrix3D geology modeling
万方数据
维普
