Correlating Spatial Model of Coal Quality with Coal Microstructures Detected from X-Ray CT Image Analysis
This study presents an application of the industrial X-ray CT scanner to correlation of coal quality with microstructures by scanning several bulk and core coal samples from a multilayer coal deposit in East Kalimantan, Indonesia. Most of samples were taken from three main seams termed Seams T, R, and Q from the upper to the lower sequence. Each seam is classified into three sub-units: top, middle, and bottom because the quality of top and bottom sub-units is different from the middle sub-units. In general, the top and bottom sub-units have the ash content and total sulphur higher than the middle sub-units. Following this circumstance, coals were sampled from these sub-units for each seam and also oriented in the field. Coal microstructures were detected by image analysis of CT-values that are related to the bulk density of material. Coal microstructures were focused on the components in the coal samples with unusual CT-values. The normal coal components (macerals) had the CT-values ranging from 100 to 300. Based on this general trend, the components that had the CT-values extremely larger or smaller than that range were classified into impurity materials. Some natural microfractures detected on the CT-images were also infilled by impurity materials in some parts. In addition to the CT-image analysis, we produced a spatial model of coal quality using the borehole sample data and geostatisties. The impurity materials hi coals detected from the CT-image were used to interpret this quality distribution. As the result, the low quality of coal is spatially correlated to the presence of artificial microfractures and larger amount of impurity materials infilled in the natural microfractures.
Mohamad Nur Heriawan Katsuaki Koike
Graduate School of Science and Technology, Kwnamoto University, Kurokami 2-39-1, Kumamoto 860-8555, Graduate School of Science and Technology, Kwnamoto University, Kurokami 2-39-1, Kumamoto 860-8555,
国际会议
The 12th Conference of the International Association for Mathematical Geology(第12届国际数学地质大会)
北京
英文
86-89
2007-08-26（万方平台首次上网日期，不代表论文的发表时间）