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在许多第三纪的沉积盆地中,产巨厚褐煤层。在云南,有昭通,小龙潭、先锋等聚煤盆地。前人对此类巨厚褐煤层内部的变化尚少研究,笔者按巨厚煤层的特点,试用最优分割法进进行地质分析。 (一)巨厚煤层的基本特征及其沉积环境巨厚煤层的特点之一是厚度大、夹矸少,在宏观上和微观上变化都不明显。因此,给煤层详细对比和其他的地质研究带来一定困难。尽管测井资料可有助于煤层的圈定和对比,但对内部变化的进一步研究仍显得无能为力。按现代泥炭堆积速度为0.2—0.4毫米/年,泥炭转化为褐煤的压缩比为4∶1计算,形成50米厚的褐煤所需的时间达50—100万年。以昭通盆地
In many Tertiary sedimentary basins, thick lignite production. In Yunnan, Zhaotong, Little Longtan, Pioneer and other coal-bearing basin. Previous studies on the internal changes of such huge thick brown coal seams have not been done yet. According to the characteristics of the thick coal seams, the authors try the optimal segmentation method to conduct geological analysis. (A) the basic characteristics of huge thick coal seam and its depositional environment One of the characteristics of the thick coal seam is thick, less gangue, the change in the macro and micro are not obvious. Therefore, the detailed comparison of coal seams and other geological studies bring some difficulties. Although well logging data can contribute to the delineation and contrast of coal seams, further research into internal changes remains powerless. According to the modern peat accumulation rate of 0.2-0.4 mm / year, peat conversion to lignite compression ratio of 4: 1 calculation, the formation of 50-meter-thick lignite time of 50-100 million years. Zhaotong Basin