工程钻机在沙卵石地区的物探钻井

川西平原属沉积平原，不到2m厚的表土下面全是沙卵石，沙卯石厚度达二、三十米。地面覆盖农田，沟垄纵横，限制了车载钻机的进入。以往地震勘探多采取浅井组合方式激发，所获得的地震资料能量差、面波强，对农田破坏面积大。若使用SH30—2A型轻便工程钻机，配上自制的冲击管，采取冲击钻进，从管中下药柱的方式，可实现沙卵石地区的深井激发，提高资料采集质量，且效率高、成本低。

Geophysical exploration drilling by engineering rig in sand-gravel mixture area

Chuanxi plain belongs to sedimentary plain, where there is sand-gravel mixture under the surface soil in less than two meters in thickness, the thickness of sand-gravel mixture is 20m~30m; the surface is covered by farmland and criss-cross field ditches that prevents track-mounted rig from entering. The former seismic exploration mostly adopted shallow pit array pattern for shooting, which resulted in poor energy of seismic data, strong surface wave and heavily damaging farmland. If using Sh30-2A portable engineering rig, matched by impact pipe made by us, using impact for drilling and lowering down the charge column within pipe, which can fulfill deep-hole shooting in sand-gravel mixture area, improve data acquisition quality and reduce cost.