Coal resources forecast Second, the classification and classification of forecasting resources Predictive credibility reflects the adequacy of the forecast basis. This time, the second coalfield forecasting practice is adopted. The credibility is expressed in levels and is classified into three levels: predictive reliability, predictive possibility and predictive inference. The specific definitions of each level are as follows. Reliable grade shallow areas with a certain density of mountain engineering or mine exposure, and a small amount of drilling control; or effective ground geophysical engineering control; or limited extrapolation in the production mining area, the two wings or deep parts of the surveyed area; or carried out For areas with geological maps of scale 1/2.5 million or above, combined with analysis of geological laws, it is determined that there are coal-bearing strata and recoverable coal seams. The geological structure is basically clear, and the measurement parameters (coal area, coal seam thickness, coal seam) Depending on the apparent density, resource abundance, depth, etc., the coal and coal quality can be basically determined. Possible level has been less than 1 / 25,000 scale coalfield geological mapping; or a small amount of mountain engineering, mine exposure and individual drilling control; or more effective ground geophysical work; or limited extrapolation of reliable level prediction area, combined Analysis of geological laws, there are indeed coal-bearing strata, there may be recoverable coal seams, the geological structure grid is basically clear, and the measurement parameters and coal and coal quality are presumed. Inferred level according to regional geological survey or geophysical exploration, remote sensing data; or limited extrapolation of potential level prediction area, combined with regional coal accumulation law, may contain coal-bearing strata, recoverable coal seams, measurement parameters and coal, coal Quality and so on are all inferred. The burial depth of the predicted resources is calculated from the local minimum erosion benchmark. In the coal-producing areas of South China, the coal-producing conditions of Liao, Ji, He, and the coal-bearing areas in the coal-producing areas of Zhejiang, Guizhou, Guizhou, Guizhou, Guizhou, Hunan, Hunan, Guangxi, Hubei, and Shandong are relatively poor. Province (district) or region, the maximum predicted depth is 1500m, and the rest is 2000m. In the above-mentioned depth range, the division is 600m in shallow, 600 ~ 1000m, 1000 ~ 1500m and 1500 ~ 2000m four segment distance statistics. The prospective area's coal census use classification is based on the prediction area. The coal mining geological conditions, the prediction credibility, the predicted resource size, the regional distribution of the forecast area, and the feasibility of conducting a coal survey are qualitative. Delimited. The general principles are as follows. Class I area: coal-producing conditions, coal-rich areas with large coal-bearing basins or basins, stable coal seams, simple and moderate geological structures; high predictive credibility, reliable and probable-level forecasting resources accounting for more than 70%; Buried in the depth of 1000m shallow, the resources are large; adjacent to the larger production mines or detailed, intensive exploration areas, or has been listed as the coal industry development planning area, most of the priority areas for coal census. Class area: The coal-forming conditions are better, which is the rich coal belt of the more stable coal-bearing basin. The coal seam is relatively stable and the geological structure is medium. It is in the epicenter of the production mine (well) or adjacent to the general survey and coal prospecting area. The degree is higher, the possible level (including above) predicts the resources accounted for 50%~70%; the majority of the coal seams have a depth of 1000~1500m, and the resources are medium-sized. Consider the areas where the coal census is selected in the near and medium term. "Category: Poor coal formation conditions, unstable coal seams, complex geological structures; low predictive credibility; inferred level forecast resources account for more than 50%; adjacent non-production mines (wells) or surveyed areas, geographical conditions Poor, the scale of resources is small, and it is not appropriate to consider the area where coal censuses should be considered in the near future. Han area: Poor coal formation conditions, unstable coal seams, complex geological structure; predictive resources inferred based on regional adjustment results or coal accumulation rules, and small scale, most buried depths greater than 1500m (north) or 1000m (south ), it is not appropriate to arrange the area for coal census.
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