摘要
可控震源相较于炸药震源具有安全性、经济性、频率和能量可控等优点.针对可控震源线性扫描不能对高频衰减进行有效补偿问题,本文提出了一种非连续独立分频扫描技术,根据单炮记录目的层频谱响应特征,优选扫描信号整体频率范围及不同非连续独立频段成分,根据地质任务要求定量确定不同非连续独立频段最佳扫描时长,达到补偿地层衰减吸收,拓宽目的层频带,提高地震勘探分辨率目的,同时此方法又弥补了传统非线性扫描方式的不足,具有地质目标导向、针对性强、成效高等特点,并且通过实例论证了此技术的有效性,同时也为野外可控震源高分辨率地震采集信号设计提供理论指导.
Vibrator have the advantages of security, economy, controllable frequency and energy compared with explosive source. For the problem that the linear scanning of vibroseis cannot compensate the high frequency attenuation effectively, a non-continuous independent frequency division sweeping technique is proposed in this paper, According to the spectrum response characteristics of the target layer recorded by a single-shot gather, the integral frequency range of the sweeping signal and the components of different discrete independent frequency bands are determined, according to the requirements of geological tasks, the optimal sweep time design of different discontinuous independent frequency bands can be determined quantitatively to compensate the attenuation and absorption of the formation, widen the frequency band of the target layer and improve the resolution of seismic exploration. At the same time, this method makes up for the deficiency of conventional non-linear sweep, which it has the characteristics of geological target orientation, pertinence and high efficiency. The effectiveness of this technology is demonstrated by examples, and it also provides theoretical guidance for the design of high resolution acquisition signal of field vibrator.
作者
肖云飞
XIAO YunFei(Sinopec Geophysical Research Institute,Nanjing 211103,China)
出处
《地球物理学进展》
CSCD
北大核心
2021年第1期300-309,共10页
Progress in Geophysics
基金
国家科技重大专项(2016ZX05014-001)
中国石化科技部项目(P16073)共同资助。
关键词
可控震源
目的层频谱响应
扫描信号设计
地层吸收衰减
非连续独立分频扫描
高分辨率地震采集
Vibrator
Spectral response of the target layer
Design of sweep signal
Attenuation and absorption of the layer
Non-continuous independent frequency division sweep
High-resolution seismic acquisition
