Comparing the predicted results with the second coal field

The second national coalfield forecast was completed and reported in 1981, and the information used was as of the end of 1975. The national forecast resource of the report is 44927.08 x 10 ⁸ t. In addition, the cumulative coal resources discovered in the country at the end of 1975 (that is, the accumulated accumulated reserves of the year) was 5665.11 x 10 ⁸ t. The total amount of coal resources in the country was 50592.19 x 10 ⁸ t.

The information used in this coal resource forecasting work was as of the end of 1992. The accumulated coal resources in the year was 10,444.59 x 10 ⁸ t, plus the current forecasted resource of 455.04 x 10 ⁸ t. At the end of 1992, the total national coal resources was 55,965.63 x 10 ⁸ , which was the total resource of the second coal field forecast. The amount increased by 5373.44 x 10 ⁸ t.

The comparison of the total coal resources of each province (district) is shown in Table 2-8-17. It should be noted that the figures in the table are the sum of the discovered coal resources (ie, the cumulative “explored reserves” and the predicted resources, reflecting the changes in the total coal resources in the two coalfield forecasts by the provinces (districts). The number of discovered and retained resources (ie, “holding reserves”) used by the statistics in other chapters of the book is different.
Table 2-8-17 Comparison table of total coal resources in the second and third coal fields (unit: x10 ⁸ t)

It can be seen from Table 2-8-17 that the changes in the total resources of provinces (regions) vary greatly. The total coal resources in 12 provinces (districts) increased by 700.652x 10 ⁸ t. Xinjiang and Inner Mongolia have the largest increase, both exceeding 2000 x 10 ⁸ t. This is mainly through comprehensive research on large coal-bearing basins, combined with ground geophysical exploration and deep oil drilling data, and found that coal-bearing properties are better and coal-bearing areas are enlarged. The increase in Shaanxi is also large, mainly through the study of coal accumulation laws in the Ordos coal-bearing basin, combined with deep oil drilling data, to expand the resource prospects. The total resources of Guizhou, Qinghai and Sichuan have also increased, mainly through the regional coalfield geological survey, which has expanded the prediction of coal-bearing area. The total resources of Henan, Ningxia, Yunnan, Jiangxi and other provinces have also increased. Tianjin and Hainan were drawn from the original Hebei and Guangdong provinces.

The total resources of 17 provinces (districts) decreased from the previous period, with a total reduction of 1687.08 x 10 ⁸ t. The reductions are in Shanxi, Shandong, Gansu, Hebei, Anhui and other provinces. The reason is that through the geological research and census exploration for more than ten years, a number of original prediction areas or the original predicted resources are denied; Liaoning, The depth of this forecast in Jilin and Heilongjiang provinces was changed from 2000m to 1500m, which reduced the amount of predicted resources. In the southern provinces (districts) such as Guangxi, Guangdong, Jiangsu, Hunan, Fujian, etc., the predicted resources have also been greatly reduced. This is mainly due to the correction of the recoverable coal-bearing rate parameters in this work, and the abandonment of the recoverable The coal rate is below 40% and the original forecasted resources are not connected; the provinces (regions) such as Zhejiang, Hubei, and Tibet have used coal in the previous forecast to be too large. This time, based on actual data, adjustments were made. The amount of resources is also reduced accordingly. In addition, the total coal resources in Taiwan was 4.23 x 10 ⁸ t in the previous forecast. Due to the unknown situation in recent years, according to the available data, the thickness of the coal seam in the province is generally smaller than that of the other provinces (districts). The thickness was collected, so this work did not predict the resources of Taiwan, and the total amount of resources in the province was lacking. Shanghai has no forecast resources.

Ф250mm Finger Joint Cutters

SICHUAN TELOS NEW MATERIAL TECHNOLOGY CO., LTD , https://www.telosmaterial.com