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由于煤层本身煤质、厚度的不同,以及煤层与其顶底板之间的物性差异,反映在测井曲线上效果也就不同。一般情况下,煤层单一,物性条件好时,测井曲线反映明显,综合解释可靠,分层精度较高。但当煤层为含若干层夹矸的复杂煤层时,正确利用煤层及夹矸的物性条件,选择适当的方法,就成了解决复杂煤层的关键。我们在陕北某井田,利用三极侧向电流及侧向梯度法,对解决该井田复杂煤层的划分及对比,取得了很好的效果。现将我们工作中的一点体会介绍如下。
Due to the different coal quality and thickness of the coal seam and the difference of physical properties between the coal seam and the top and bottom of the coal seam, the effect reflected in the logging curve is also different. Under normal circumstances, a single coal, good physical conditions, well logging curve reflects the comprehensive interpretation of reliable, high-precision stratification. However, when the coal seam is a complex coal seam with several layers of gangue, it is the key to solve the complex coal seam that the correct use of the physical conditions of the coal seam and the gangue and the selection of the appropriate method. We are in a field in northern Shaanxi, the use of three-pole lateral current and lateral gradient method to solve the complex coal mine in the division and comparison, and achieved good results. Now a little experience in our work are described below.