本文選題：射線束偏移 + 帶限信號�。� 參考：《石油地球物理勘探》2017年05期

【摘要】：地震信號的帶限特點限制了高頻近似下的射線類算子在地震波模擬和偏移中的應(yīng)用。本文基于射線理論構(gòu)建帶限信號局部平面波傳播算子,兼顧射線類方法具有時空局部性和實現(xiàn)靈活高效的特點,有效進行帶限地震波場的模擬和偏移。即分析傳統(tǒng)高頻射線在速度界面的傳播特征,利用帶限信號頻帶與菲涅耳帶的關(guān)系,構(gòu)建帶限斯奈爾定律進行中心射線傳播;在局部平面波假設(shè)下,基于帶限中心射線做旁軸近似展開,構(gòu)建帶限局部平面波傳播算子;在此基礎(chǔ)上發(fā)展基于該算子的帶限射線束偏移方法。數(shù)值實驗結(jié)果表明,帶限射線束較傳統(tǒng)基于高頻近似的射線束具有更強穿透能力,改善射線陰影區(qū)照明,從而提高復(fù)雜構(gòu)造區(qū)成像質(zhì)量。
[Abstract]:The band limit of seismic signal limits the application of ray-like operators in high frequency approximation to seismic wave simulation and migration. Based on ray theory, the local plane wave propagation operator of band-limited signal is constructed in this paper. The radiographic method has the characteristics of space-time localization and realization of flexibility and efficiency, so the simulation and migration of band-limited seismic wave field are carried out effectively. That is, analyzing the propagation characteristics of the traditional high frequency ray at the velocity interface, using the relation between the band limited signal frequency band and the Fresnel band, constructing the band limited Snell law for the central ray propagation, under the assumption of local plane wave, Based on the paraxial approximation of the band-limited central ray, the band-limited local plane wave propagation operator is constructed, and the band-limited ray beam migration method based on this operator is developed. The numerical results show that the band-limited ray beam has a stronger penetrating ability than the traditional high-frequency approximation ray beam and improves the illumination of the shadow region of the ray, thus improving the imaging quality of the complex structure area.
【作者單位】： 中國地質(zhì)大學(xué)地球物理與空間信息學(xué)院;地球內(nèi)部多尺度成像湖北省重點實驗室;中國石化油田勘探開發(fā)事業(yè)部;
【基金】：國家重大專項(2016ZX05026001-001) 國家自然科學(xué)基金(41604092) 中國博士后科學(xué)基金(2016M590725) 中國石化國家重點實驗室開放基金(33550006-16-FW0399-0021)等聯(lián)合資助
【分類號】：P631.4
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本文編號：2059283