强穿透力的宽高频地震子波激发方法

Method of exciting the strong penetration power seismic wavelet with high-frequency and wide frequency band

在保证一定信噪比的前提下,获取主频高、频带宽的地震记录是高分辨率资料采集追求的主要目标,尤其是薄互层油气勘探更需要很高分辨率的地震资料,而做到这一点的关键是要激发出强穿透力的宽高频地震子波.以往用加大井深和药量的方法提高地震波穿透能力,效果不够理想.本文从分析影响地震子波特性的因素入手,介绍了宽高频地震子波的激发方法以及增强地震波穿透能力的激发方式,给出了大庆探区的试验效果,期望对高分辨率地震资料采集工程有一定指导作用.

Under certain signal-to-noise ratio of guarantee premise, it is the main target for the high resolution seismic data acquisition to obtain the seismic record with high-dominant frequency and wide frequency band, especially for the exploration activity of thin alternating layers. It is critical to excite the strong penetration power seismic wavelet with high-dominant frequency and wide frequency band. In the past, the method is enlarging well-depth and dynamite mass to rise the seismic wave passes through an ability, but the effect was not ideal enough. Beginning with analyzing the factors which affect the seismic wavelet characteristic, the exciting methods of wavelet with high-frequency and wide band and enhancing the penetration power of seismic wavelet are introduced. In addition, the test results are also shown, which plays an guiding role for the high-resolution seismic data acquisition projects.