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松辽盆地西南部砂岩型铀矿地震资料处理技术研究

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文章针对松辽盆地西南部砂岩型铀矿地震资料噪声严重,干扰波能量比较强,资料频带窄、主频低、以及地震记录单炮之间、深浅层和远近道之间能量差异比较大的特点,在地震资料处理的叠前去噪、振幅补偿以及提高分辨率等关键环节开展了研究.在去噪环节,采用了叠前多域组合分步去噪方法,针对性地去除面波、线性噪声、强能量干扰以及次生干扰等,增强了目的层有效反射信号强度,提高地震资料信噪比.在振幅补偿中采用地表一致性振幅补偿和几何扩散补偿方法,可以明显消除远近道、浅层与深层之间以及道间能量差异.在提高分辨率环节通过地表一致性反褶积和预测反褶积方法,可消除地震波传播过程中子波变化引起的波形、频谱等特征的差异,压缩子波,缩小子波旁瓣,拓宽有效信号频带,提高地震资料分辨率.最后建立了一套地震资料的处理流程,并建立了相应环节的质量监控措施.通过与前人处理结果对比,此次建立的地震资料处理方法可以明显提高地震资料的品质.
Research of Seismic Data Processing for Sandstone-type Uranium Deposit in Southwestern Songliao Basin
Based on the analysis of amplitude,frequency and noise characteristics of seismic data for sandstone-type uranium deposit in Songliao Basin,the research of seismic data processing method was carried out.With the method of integrated stepwise noise attenuation in multiple domain before stacked,the surface wave,linear noise,high energy interference was attenuated,the effective signal was remained,the signal-to-noised ratio was enhanced.In amplitude compensation,the combination of surface consistent amplitude compensation and geometric diffusion amplitude compensation could resolved the difference because of far and near offset,and deep and lower layer.By the joint of surface consistent deconvolution and predictive deconvolution,the variation of wavelet changed with space and time was eliminated,the sidelobe of wavelet was compressed,the resolution of seismic data was improved with the broadened frequency band.By comparing with the processed result before,the seismic data quality was improved by the processing method presented in this paper.

Songliao Basinseismic data processingnoise attenuationamplitude compensationdeconvolution

曹成寅、李子伟、乔宝平

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核工业北京地质研究院,北京 100029

松辽盆地 地震资料处理 去噪 振幅补偿 反褶积

中核集团第四代铀矿勘查关键技术研究与示范项目

中核科发2021-143号

2024

铀矿地质
中国核学会铀矿地质学会

铀矿地质

CSTPCD
影响因子:0.714
ISSN:1000-0658
年,卷(期):2024.40(2)
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