摘要
合肥盆地集山地、丘陵、平原、沼泽、水网等复杂地表于一体;低降速带变化频繁,地层倾角变化大,地层界面反射能量弱,噪声干扰严重,资料信噪比低。在合肥盆地的地震采集施工中,针对地表情况,设计了高覆盖次数、大地检距、小道间距的观测系统;利用卫星照片,结合地质露头调查资料,合理选择接收、激发条件,并及时调整观测系统,采用高爆速炸药激发技术,所得资料较老资料品质有明显改进,效果非常理想。
The Hefei basin puts all kinds of complex topography together such as mountains,hills,plains, mashes and network of rivers etc. ; Lower Velocity Layer (LVL) has rapid changes both in thickness and velocity;bed-dips are variable;weak reflection from interface and strong noise interference made data poor signal-to-noise ratio. We adopted the following measures in seismic field operation in Hefei basin in view of the surface condition; designing of geometry with high folds, long offset and small group interval; using satellite photo and in combination with geologic outcrop investigation data for reasonable selection of shooting and receiving conditions and adjustment of geometry in times adopting the charge with high-explosive-speed to shot etc. The resulted data has obvious improvement in comparison with legacy data and ideal effects.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2003年第4期369-374,共6页
Oil Geophysical Prospecting
