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辽河拗陷深层地震采集技术 被引量:1
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作者 毕建国 王良书 梁绍波 《石油地球物理勘探》 EI CSCD 北大核心 2006年第3期313-318,共6页
辽河拗陷以往采集的深层地震资料信噪比和分辨率都较低,不能满足辽河油田进一步勘探和开发的需要,为此必须以获得良好的深层资料为目标,努力提高地震资料的信噪比和分辨率。辽河油田分公司选择辽河拗陷东部凹陷欧利坨子北部地区为突破口... 辽河拗陷以往采集的深层地震资料信噪比和分辨率都较低,不能满足辽河油田进一步勘探和开发的需要,为此必须以获得良好的深层资料为目标,努力提高地震资料的信噪比和分辨率。辽河油田分公司选择辽河拗陷东部凹陷欧利坨子北部地区为突破口,通过采用最佳岩性激发、有效弱信号保护、变观测系统、增加覆盖次数等一系列改进措施,进行了系统分析和系列攻关试验,并采集了新的地震资料。可以明显地看出,新资料不仅具有丰富的浅层信息,其深层(3000m以下)及潜山内幕反射也很清晰,分辨能力有明显提高。 展开更多
关键词 地震采集 最佳岩性激发 有效信号保护 变观测系统
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Ability to detect weak effective seismic signals by utilizing chaotic vibrator system 被引量:6
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作者 LI Yue YANG Baojun +2 位作者 YUAN Ye ZHAO Xueping LIN Hongbo 《Chinese Science Bulletin》 SCIE EI CAS 2006年第24期3010-3017,共8页
Taking the advantage of CVS (Chaotic Vibrator System) sensitivity of large-scale periodic phase-state response to quasi-periodic or periodic signals,a series of numerical experiments were made to understand the abilit... Taking the advantage of CVS (Chaotic Vibrator System) sensitivity of large-scale periodic phase-state response to quasi-periodic or periodic signals,a series of numerical experiments were made to understand the ability of CVS to detect weak effective seismic signals in the common-shot seismic record distorted by strong stochastic noise. The re-sults demonstrate that the large-scale periodic phase-states of CVS are correlated with the signal composition of the quasi-periodic wavelet sequence constructing from horizontal moveout of seismic events,noise strength and the noise distortion de-gree to signal. For the same kind of events,the higher the noise distortion degree is,the lower the detectable SNR can be reached by CVS. For seismic data with the same noise distortion degree,the closer the scanning seismic velocity (the trial moveout ve-locity) approaches to the accurate velocity,the higher the detectable SNR can be reached by CVS. More-over,the truncating scanning velocities form an asymmetric belt,which indirectly makes CVS achieve a large-scale periodic phase-state and then the ratio of wavelet distortion coefficients in events can be a biggish variable scope. 展开更多
关键词 地震勘探 地震信号 弱有效信号 信噪比 杂乱震荡器系统
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