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低频线性干扰是在地震采集中普遍存在的一类干扰波,对单炮质量有很大影响。因此压制线性干扰,提高资料质量是十分必要的。本文以春光油田以及泌阳古河道区为实验区,讨论了低频线性干扰的形成机制,研究发现线性干扰的强弱与低降速层厚度存在关系。激发点所在低降速层厚度越大,低频线性干扰越强,也即在野外采集时炮点深度越大,线性干扰越弱。试验结果表明,在野外采集过程中加大炮点深度,使得炮点位于高速层界面以下时,线性干扰的压制效果比较好。
Low-frequency linear interference is a common type of interference wave in seismic acquisition, which has a great impact on single-gun mass. Therefore, it is very necessary to suppress linear interference and improve data quality. In this paper, the spring oil field and the ancient Biyanghe River as the experimental area to discuss the formation mechanism of low frequency linear interference, the study found that the strength of linear interference and low velocity layer thickness is related. When the excitation point is low, the greater the thickness of the low velocity layer, the stronger the low-frequency linear interference, that is, the greater the depth of the shot when the field is collected, the weaker the linear interference. The experimental results show that the suppression effect of linear interference is better when the shot depth is increased during the field acquisition so that the shot point is below the interface of the high-velocity layer.