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可控震源非线性扫描是高频地震勘探的一种手段。但是,由于以往使用的非线性扫描对高频地震信息的补偿,没有考虑地下介质结构衰减量的横向变化和震源与大地耦合响应的影响,以致使所获得的地震资料往往不够理想。为此,本文根据测区内主要目的层的不同埋深及近地表地层特征进行分区,然后分别求取吸收衰减量和振动耦合衰减量,再根据衰减量总和及噪音性质,从期望的扫描频宽出发,分区计算出相应的补偿系数,对高频地震信息进行补偿。本文还就与可控震源非线性扫描长度和震源台数,振动次数及低频端扫描速率、扫描频宽等参数的选择与计算方法作了比较详细的介绍。
Vibrator non-linear scanning is a means of high-frequency seismic exploration. However, due to the nonlinear compensation used in the past, high-frequency seismic information is not compensated by the lateral variation of the attenuation of underground media structures and the coupling effects between the source and the ground, so that the obtained seismic data are often not ideal. Therefore, based on the different buried depths and near-surface stratigraphy of the main target formation in the survey area, the absorption attenuation and vibration coupling attenuation are calculated separately. Based on the sum of the attenuation and noise characteristics, Wide starting, partitioning to calculate the corresponding compensation coefficient, high frequency seismic information to be compensated. This article also made a more detailed introduction to the selection and calculation of parameters such as the length of non-linear scanners and the number of vibrating sources, the number of vibrations, the scan rate of low frequency end and the scan bandwidth.