东风勘查区煤层特征及对比分析

Coal seams characteristics and comparative analysis in Dongfeng exploration area

河北省康保县东风勘查区位于冀北隆起带忠义凹陷的东部,含煤地层为侏罗系中统下花园组。勘查区总体构造形态为一比较宽缓、轴向北—北东的向斜构造,地层产状较缓,倾角一般10°左右,构造中等。依据岩性、岩相组合特征及含煤性,下花园组划分为上、下两段,下段含煤,上段不含煤。下花园组下段厚度131.63~830.50 m,平均厚度385.26 m,含煤9层,但多以薄煤层和煤线的形式出现,仅在近下部发育的5煤层为大部可采煤层。利用岩煤层岩性、岩相组合特征及二维地震时间剖面等多种综合对比手段,较好的解决了勘查区煤层对比问题。

Dongfeng exploration area is located in the east of Zhongyi in the North of Hebei, the coal-bearing stratum is the Xiahuayuan formation of Jurassic System. The overall tectonic form of the exploration area is a broad and gentle syncline structure with axial direction from north to north east. According to the characteristics of lithology, lithofacies combination and coal bearing property, Xiahhuayuan formation is divided into upper and lower sections, the lower section contains coal,and the upper section contains no coal. The thickness of the lower segment of Xiahhuayuan formation is 131.63~830.50 m,with an average thickness of 385.26 m. It contains 9 layers of coal, but most of them are in the form of thin coal seam and coal line. The problem of coal seam correlation in exploration area is well solved by means of comprehensive comparison of lithology, lithofacies combination and 2 d seismic time profile.