摘要
常规可控震源实现低频激发需要延长扫描信号的扫描长度,从而导致生产效率降低、采集成本增加。为此,提出可控震源混频同步激发方法,该方法将长扫描信号拆分成若干短扫描信号,进行同步混频激发,实现可控震源时序单频依次扫描向多频同步激发的转变。激发方式可采用组合同步激发和独立同步激发,其中组合同步激发资料信噪比高,混叠噪声小;独立同步激发效率更高,但混叠噪声略高。现场试验证明:可控震源混频同步激发不仅生产效率高,而且混叠噪声小;在资料处理时无需进行特殊的去混叠处理,地震数据质量即可大幅提高。事实证明,可控震源混频同步激发方法是常规可控震源低频勘探技术经济一体化的有效方案。
To achieve low frequency sweep with conventional vibrators,the sweep length of the sweep signal needs to be extended,which leads to the decrease of production efficiency and the increase of acquisition cost.Therefore,the frequency blending simultaneous sweep method of vibrators is proposed.In this method,a long sweep signal is split into several short sweep signals for frequency blending simultaneous sweep,which realizes the transformation of vibroseis sequential single frequency sweep to multi-frequency simultaneous sweep.There are two simultaneous sweep methods.One is array simultaneous sweep with high SNR data and low blended noise.The other is independent simultaneous sweep with higher efficiency and slightly higher blended noise.Field tests have shown that the frequency blending simultaneous sweep not only has high production efficiency,but also low blended noise.Special deblending is not necessary in data processing,and the quality of seismic data can be greatly improved.It has been proven that the frequency blending simultaneous sweep method is a cost-effective solution for conventional vibrators low frequency sweep.
作者
魏铁
祝杨
李培明
魏国伟
王懂
WEI Tie;ZHU Yang;LI Peiming;WEI Guowei;WANG Dong(BGP Inc.,CNPC,Zhuozhou,Hebei 072751,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2024年第5期948-956,共9页
Oil Geophysical Prospecting
基金
中国石油天然气集团有限公司科技项目“多物理场高精度油气地球物理探测技术与装备研究”(2023ZZ05-01)之课题“全波场地震采集理论、关键技术与核心装备”资助。
关键词
可控震源
组合同步激发
独立同步激发
高效采集
混叠噪声
vibroseis
array simultaneous sweep
independent simultaneous sweep
high productivity acquisition
blended noise
