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转换波不同于纵波,它具有非对称路径、速度小、频率低、能量弱等特点,又由于单点数字检波器接收,干扰严重、波场复杂,使得资料的信噪比低于纵波.水平方向接收使得面波等低频信号成为转换波资料的主要干扰,其能量强度和范围明显强于纵波,且具有非双曲现象.转换波有效波和干扰波在速度、频率等方面的重叠性,使得常规基于频率或者速度的去噪方法应用于转换波去噪时,会丢失大量的有效信号,无法有效去除这类干扰.因此,本文针对转换波资料低频噪音特点,研究了三维转换波自适应叠前矢量去噪技术,主要用于压制多波资料中的各种强能量的大倾角规则噪声,如范围广泛的面波、次生干扰波等,并在胜利探区多个区块实际数据处理中取得了良好的效果.
The converted wave is different from the longitudinal wave, it has the characteristics of asymmetric path, low speed, low frequency, weak energy, etc., but also because of single-point digital detector to receive, serious interference, wave field complex, making the signal to noise ratio lower than the longitudinal wave. Directional reception makes low-frequency signals such as surface waves become the main interference of converted wave data, and its energy intensity and range are obviously stronger than those of longitudinal waves, and have non-hyperbolic phenomenon. The overlapping of effective wave and interference wave of the converted wave in speed, frequency, Therefore, when the conventional denoising method based on frequency or velocity is applied to denoising converted waves, a large number of effective signals will be lost and this kind of interference can not be effectively removed.Therefore, this paper focuses on the characteristics of low frequency noise of converted wave data, The prestack vector de-noising technology is mainly used for suppressing large-angle regular noise of various strong energy in multi-wave data, such as a wide range of surface waves, secondary interference waves and the like, and actual data of a plurality of blocks in the Shengli Exploration Area The treatment has achieved good results.