积家井矿区延安组煤层对比方法分析

Coal seam correlation methods of Yanan Formation in Jijiajing mining area

积家井矿区侏罗系中统延安组共含煤20多层,本次研究编号煤层23层,其中可采煤层以及局部可采煤层共有9层。延安组自下而上可分为5个岩段,其中第Ⅱ段煤层最厚,大于7 m。延安组为浅水湖泊三角洲沉积,相变大,无稳定的标志层,对该区煤层对比增加困难,进而影响矿区的总体发展规划。依据旋回以及沉积韵律、煤层层间距、煤层自身特征、煤岩特征、地球物理特征、地震物性特征等属性进行煤层综合对比,可靠性较强,特别是针对矿区可采煤层的纵横向发育追踪对比,依据充分,结果可靠。

Yanan Formation of middle Jurassic in Jijiajing mining area contains more than 20 coal seams. This study numbers 23 coal seams, among which 9 coal seams are mining coal seams or local mining coal seams. Yanan Formation can be divided into 5 sections from bottom to top,in which the second section has the most thickness of more than 7 m. The sedimentary environment of Yanan Formatin belongs to shallow water lake delta,which is char- acterized by changeable phases and unstable marker bed. These situations would multiply the difficulties in the coal seam correlation,then affect the overall development plan of Jijiajing mining area. According to the properties of cycle and sedimentary rhythm, interlayer spacing between coal seams, own characters of coal seams, coal petrographic characteristics, geophysical characteristics, and seismic physical properties characteristics, this study took a synthetical contrast of coal seams, with high reliability. Especially in longitudinal and horizontal tracing contrast of mining coal seams,these methods have ample foundation and reliable resuhs.