趋势面分析在东欢坨井田构造研究中的应用

Application of Trend Surface Analysis in Donghuantuo Minefield Structural Study

受区域构造及其演化过程的控制作用,造就了东欢坨矿区构造具有多期次、多性质、多方向、多级别和多序次的特点。选择东欢坨矿大苗庄组8煤层底板标高代表石炭—二叠系含煤地层的起伏变化规律,利用钻孔坐标构建了二维多项式趋势面数学模型。通过对8号煤层底板标高1-4次趋势面和偏差图的分析,提示了开滦矿区东欢坨井田的构造格局:煤层底板有自北东向南西由高到低的变化趋势;主体构造为北东—南西向,趋势图上呈现典型的"反S"型扭曲,且煤层底板等高线趋势面形态显示在走向NE、倾斜ES的单斜基础上,有近东西向构造叠加的格局。该研究还表明煤层底板标高趋势面偏差分析可反映构造形态细节,且随着趋势面偏差次数的增加,分区性更趋明显。

Since controlled by tectonics and their evolution process,have resulted in structures in the Donghuantuo minefield characteristics of multi-stage,multi-character,multi-orientation,multi-level and multi-order.The Damiaozhuang Formation No.8 coal seam floor elevation in the Donghuangtuo coalmine has selected to represent Permo-Carboniferous coal-bearing strata undulating variation pattern,based on borehole coordinates established a 2D polynomial trend surface mathematical model.Through linear,quadratic,cubic and quartic trend surfaces and deviation map analyses of No.8 coal floor,prompted the structural framework of the minefield,Kailuan mining area： from northeast to southwest variation trend of coal floor is from high to low;NE-SW main structure presents a typical inversed ＂S＂ twist,on the NE strike,dip SE monocline basis,the coal floor contour trend surface configuration has a near EW structural superimposition framework.The study has demonstrated that the coal floor elevation trend surface deviation analysis can reflect structural form details,along with the increasing of trend surface deviation order,the zoning will be more clear.