摘要
由于成煤期的泥炭沼泽基底不平以及地质环境等的变化,导致相对较大的地质区域内煤层常出现尖灭、分叉等复杂情况,影响开采设计,为高效准确定位煤层边界及分布位置,提出一种基于地质统计学和符号矩阵进行三维地质建模的方法。通过符号矩阵方法,按照一定精度离散煤层和非煤层数据,利用泛克里金法确定平面煤层厚度,反距离加权法确定每个栅格的符号距离函数估值,局部窗口对煤层进行精准定位,确定与煤层厚度相匹配的距离函数截距,建立煤层的三维地质模型,并讨论了距离函数截距对煤层精度的影响;滑动垂直窗口大小与煤层位置对建模结果中煤层连通性的影响。结果表明:该建模方法可以针对煤层尖灭、分叉等复杂情况快速建模,对大范围区域地质模型构建有一定的适用性,自动化程度高,可应用于煤层开采设计及资源评估。
Due to the uneven basement of peat swamps in the coal-forming period and the change of geological environments,complex 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.
作者
王艳美
刘星
WANG Yan-mei;LIU Xing(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China)
出处
《科学技术与工程》
北大核心
2024年第4期1402-1410,共9页
Science Technology and Engineering
基金
国家自然科学基金(42272281)。
关键词
尖灭分叉煤层
地质统计学
符号矩阵
三维地质建模
pinching out bifurcated coal seam
geostatistics
symbolic matrix
3D geology modeling