大柳塔煤矿五盘区5-2煤层DDF2断层特征

Characteristics of DDF2 fault which crosscut 5-2 coal seam of the fifth panel in Daliuta Coal Mine

大柳塔煤矿五盘区5-2煤层在三维地震资料解释中发现存在一条影响较大、伸展较远的断层(DDF2断层)横切5-2煤层。综合研究表明,DDF2断层为走向为东南—西北方向(111°~291°)、倾向为西南方向(201°)的高角度正断层。该断层为坳陷盆地形成后控制部分煤层沉积:在D306钻孔和D307钻孔所在区域形成时间较早,形成于5-2煤层沉积之后,结束于4-3煤层形成之后,控制5-2煤与4-3煤之间的地层沉积,为同沉积断层;该断层在D304钻孔和D305钻孔所在区域形成时间较晚,形成于4-2煤层沉积之后,结束于3-1煤层形成之后,局部控制4-2煤层与3-1煤层之间沉积,为准同生沉积断层。DDF2断层形成于东南方向,逐渐向西北方向迁移、加剧到最后尖灭。

In 3 D seismic data interpretation,it was found that there was a fault(DDF2 fault)with great influence and far extension in 5-2 coal seam,which cute in 5-2 coal seam.Through comprehensive study,DDF2 fault was a high angle normal fault with southeast northwest strike direction(111°~291°)and southwest tendency direction(201°).This fault was a basin controlling fault that controled the deposition of some coal seams after the formation of depression basin.It was formed earlier in the area where drill hole D306 and drill hole D307 were located,it was formed after the deposition of coal seam 5-2 and ended after the formation of coal seam 4-3,it was a synsedimentary fault that controled the deposition of coal seam 5-2 and 4-3,this fault was formed later in the area where drill hole D304 and drill hole D305 were located,it was formed after the deposition of 4-2 coal seam and ended after the formation of 3-1 coal seam,it was a penecontemporaneous sedimentary fault that locally controled the deposition between 4-2 coal seam and 3-1 coal seam.DDF2 fault was formed in southeast of the panel area and gradually migrated to northwest,intensified to final annihilation.