基于非线性扫描技术的可控震源地震勘探分辨率提高方法

A high resolution research with nonlinear signal to improve vibrator exploration based on nonlinear scanning

可控震源地震扫描信号易被地下介质吸收并形成高频部分衰减,降低对地下地质体的分辨能力.分析地震信号扫描方式,研究非线性扫描信号特性及其在补偿地层吸收衰减的地震相关子波信号影像中的作用,利用正演模拟和现场试验验证非线性扫描信号在提高可控震源地震勘探地震分辨率中的作用.结果表明:非线性扫描通过控制高频能量信号的时间分配,提高激发信号的高频成分,选择合适的非线性扫描信号类型和激发能量,能够提高地震勘探分辨率.该研究结果对实现高分辨率地震勘探具有一定的参考意义.

Resolution improvement has always been a goal of the field of petroleum exploration.Due to the vibrator scanning signal attenuates for the underground mass on the absorption,the linear sweep signal cannot compensate for the high frequency signal attenuation,which lowers the resolving power to the underground geologic body.However,by controlling the time share of high frequency signal energy and enhancing the high frequency component of stimulation signal,the nonlinear scanning way of vibrator can realize the purpose to raise the resolution of seismic exploration.The practical application shows that a good result can be gained to achieve the high resolution seismic survey as long as nonlinear signal scan types and stimulation energy are chosen correctly.