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新疆含煤岩系大多沉积在中新生代拗陷型、断拗型及断陷型盆地中,煤层的赋存条件比较复杂,虽单层煤厚度可达100多m,但煤层沉积厚度在区域上变化较大,煤层煤组的尖灭、合并现象时有发生,使得新疆煤田煤组标定、归并工作变得非常复杂。根据新疆煤田地质特点和地震勘探中遇到的问题,结合实例探讨利用钻孔、单炮记录和折射波速度等资料确定煤层赋存情况的方法。利用折射波速度资料编制了新疆煤田勘查区地震波速度平面图,在钻孔验证的基础上,提出了在新疆哈密煤田依据其速度判断煤层赋存状态的辅助方法:①速度4 000～5800m/s的区域,其高速界面深度较浅,属无煤层赋存区;②速度3 000～4 000m/s,高速界面不明显,存在煤层赋存的可能性;③速度低于3 000m/s,其新近系、古近系及侏罗地层较厚、有煤层赋存的可能性,但煤层埋藏深度较深。
Most coal-bearing rocks in Xinjiang are deposited in the Mesozoic-Cenozoic depression, fault-bend and fault-depression basins. The conditions for coal seam formation are rather complicated. Although the thickness of single-layer coal can reach more than 100 m, the sedimentary thickness of coal- On the larger changes in the coal seam group, the phenomenon of mergers and acquisitions occur frequently, making the coal group in Xinjiang calibration, merging work becomes very complicated. According to the geological characteristics of Xinjiang Coalfield and the problems encountered in the seismic exploration, the method of determining the occurrence of coal seams by using the data of borehole, single shot record and refraction wave velocity is discussed with examples. Based on the verification of borehole, an assisting method of judging the occurrence status of coal seam in Xinjiang Hami coalfield is proposed based on the velocity of refracted wave velocity data. (4) The velocity of 4 000-5,800 m / s Area, the shallow depth of its high-speed interface, is a coal-free zone; ② speed of 3000 ~ 4000m / s, high-speed interface is not obvious, there is the possibility of coal seam; ③ speed less than 3 000m / s, Department, Paleogene and Jurassic strata thick, the possibility of coal seam, but the depth of the buried coal seam.