摘要
受噪声和传播距离的影响,准噶尔盆地石炭系地震反射波有效成分主要是低频信息,如何改善低频信息品质是提高石炭系地震资料品质的关键。为此,提出了低频信息补偿和降低低频损失的新方法:在低频保护方面,运用十字排列域滤波为主的叠前配套技术进行噪声压制,相对于传统的噪声压制方法,这种方法能够有效地区分一次波低频端信息与低频噪声,在提高地震资料信噪比的同时,最大程度保护有效反射的低频信息;在低频补偿方面,自主研发了地震数据低频增强处理技术,基于深层地震资料高频段信噪比低于低频段的特点设计低频能量增强因子,对地震资料进行低频信息增强补偿。新的低频补偿方法和去噪流程能够使石炭系反射波的能量团更加聚焦,速度分析更加精确,建立的精细速度场大大提高了偏移成像精度。该方法在准噶尔盆地多个区块资料处理中推广应用并取得明显效果,为石炭系油气勘探提供了有力的技术支持。
Affected by noise and propagating distance,the effective signals of Carboniferous seismic reflection are almost at low frequency.How to improve and protect lost low-frequency information is the key to improve the quality of carboniferous seismic data.This paper proposes a new method.To protect low-frequency information,the prestack matching technology based on a cross-domain FKK filtering is used to suppress noises in multiple domains.Compared with the conventional method,this multi-domain denoising method can effectively distinguish the low-frequency component of primary waves from low-frequency noises.While improving the signal-to-noise ratio of seismic data,effective low-frequency reflection information can be protected to the greatest extent.To enhance the processing of low-frequency component,based on the characteristics that the signal-to-noise ratio of the high-frequency component of deep seismic data is lower than that of the low-frequency component,a low-frequency energy enhancing factor is designed to compensate low-frequency seismic data.In particular,Carbonaceous energy clusters are more focused,and a fine velocity field can be established,thereby improving the accuracy of migration imaging.The new method has been applied to several seismic blocks in the Junggar Basin and obtained good effects.It can provide powerful technical support for the exploration of Carboniferous oil and gas.
作者
妥军军
王晓涛
窦强峰
叶迪
蒋立
谭佳
TUO Junjun;WANG Xiaotao;DOU Qiangfeng;YE Di;JIANG Li;TAN Jia(Geophysical Department,Research Institute of Exploration&Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang 830013,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2020年第S01期20-24,4-5,共7页
Oil Geophysical Prospecting
关键词
十字排列域
二元空间插值
低频补偿
石炭系成像
cross-domain
binary-space interpolation
low-frequency compensation
Carboniferous imaging
