宽线大组合地震接收原理及实践

Principles and Practices of Seismic Receiving of Wideline and Large Array

在低信噪比地区,其地震资料虽经过多轮勘探但地震剖面品质没有明显的改善,这其中的关键的因素之一是干扰波十分发育,造成采集到的地震资料信噪比极低,达不到高分辨率地震勘探对信噪比的要求。为了获得这些地区高信噪比的地震资料,在系统研究了宽线及大组合地震接收原理的基础上,探讨了接收线距、接收线数及组合接收面积等关键参数,提出了宽线大组合地震接收技术,并将该技术应用于新疆库车凹陷和阿木特地区,分析了宽线大组合地震接收原理的效果和适用范围。研究表明:宽线大组合地震接收技术是抑制地震资料噪声,提高地震资料信噪比的有效手段之一,同时该技术可在其他低信噪比和干扰波发育的复杂地区地震勘探时推广应用。

In some regions with a small signal-to-noise ratio, the quality of seismic profile may not be improved obviously even though many round exploration. One of the most crucial factors is that very developed interference wave makes the acquired signal-to-noise ratio very low. In this study, some key parameters of receiving line distance and number, and array receiving area are discussed based on a systematic analysis on wideline and large array receiving principle; a seismic receiving technology of both wideline and large array is presented. This technology has been applied to Xinjiang Keche depression and Amute area. It is illustrat ed that the technology can not only inhibit the noise of seismic data but also increase the signal-to-noise ratio. In addition, it can be applied to other complex areas with low signal-to-noise ratio and developed interference wave.