摘要
采用井炮、河炮、导爆索组合坑炮的混合爆炸施工方法,在一定程度上能克服地表条件的限制,加速施工进度。另外,只要参数选择恰当,延迟组合爆炸可使各球面波的合成波前平面平行于所研究的界面,对于增强界面的反射波,压制其它方向的干扰波较为有利。 但是,由于混合施工时的参数选择困难,地震波频率成分不一致,加之地貌和表层岩性复杂多变,使得速度提取及静校正工作的难度增大,从而影响资料质量。 本文通过实例分析,讨论了混合爆炸的野外参数选择原则。在资料处理中采用地表向下延拓静校,并作波形调整,用三点法控制各层叠加速度和分层提取层间时差,所获剖面比CGG公司对相同测线的处理结果为优。
The contradiction of slowing down the exploration due to terrain condition could to a great extent be overcome by using different shooting simultaneously, namely, well shooting, water shooting and pattern explor-sion in shallow holes. Besides, the compound wavefront of the spherical waves could be made to parallel with the interface being studied if the selected parameters of delay-pattern-shooting are straight-up-and-down. This could not only enhance the reflection from the interface but it could also suppress or eliminate the interferences of all kinds(see REFEREN-
CES[1]).
Because of the seismic frequency always varies with places, hence, to determine the parameters for versatile shooting is very difficult. If the rough terrian and the change fullness of near-surface lithology are both taken into account, the velocity extraction and the static correction will become even more difficult and hence the guality of data will surely be out of control.
In this paper, the principle for determining the parameter of versatile shooting was discussed. In accordance with the analysis made for actual data, the following measurements such as the downward continuation static correction from surface, the waveform shaping,the controlling of stack velocity by three-point method and the extraction of the intrabeded mo-veouts layer by layer, etc. , weve adopted in data processing. Results were Improved and better sections were obtained. Compared with the CGG-processed section, apparently, the one processed by us own seems to be much better.
出处
《石油物探》
EI
CSCD
北大核心
1989年第1期93-102,共10页
Geophysical Prospecting For Petroleum
