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世界地质 2022, 41(2) 349-364 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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基础地质 |
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影响高斯束偏移成像质量和效率的主要因素分析 |
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张志鹏,孙章庆,韩复兴,王雪秋,刘明忱,高正辉 |
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吉林大学 地球探测科学与技术学院,长春 13002 |
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摘要:
高斯束偏移在复杂区域成像潜力巨大,其成像质量和效率受偏移参数和速度模型光滑的影响。基于此,利用理论推导、模型试算进行分析,推导了高斯束偏移的基本原理与模型光滑原理,利用Marmousi模型进行了试算研究。研究结果表明:高斯束偏移成像过程中,浅层成像精度会随最大出射角度增大而提高;射线覆盖完全时,减少傍轴射线数量成像效率提高;高斯窗半宽增加会提高偏移成像精度,但过大则图像失真;随着高斯束半宽减小,成像精度增加,但过小则浅层精度减小;高斯束中心间隔减小则成像精度提高,但成像效率变低;随着速度模型整体光滑次数的增加,成像精度逐渐增加,光滑 50次时,偏移成像效果最佳。 |
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关键词:
高斯束偏移
核心参数
模型光滑
成像质量
计算效率
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Analysis of main factors affecting imaging quality and efficiency of Gaussian beam migration |
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ZHANGZhipeng,SUNZhangqing,HANFuxing,WANGXueqiu,LIUMingchen,GAOZhenghui |
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CollegeofGeoexplorationScienceandTechnology,JilinUniversity,Changchun130026,China |
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Abstract:
Gaussianbeammigrationhasgreatimagingpotentialincomplexareas,anditsimagingqualityand efficiencyareaffectedbymigrationparametersandsmoothvelocitymodel.Basedonthis,theauthorsusetheoreticalderivationandmodeltrialcalculationforanalysis.BasicprincipleandmodelsmoothingprincipleofGaussian beammigrationarededuced,andtrialcalculationiscarriedoutbyusingMarmousimodel.Resultsshowthatshallowimagingaccuracywillimprovewithincreasingmaximum exitangleinGaussianbeam migrationimaging process.WhenXraycoverageiscomplete,thenumberofparaxialraysisreducedandimagingefficiencyisimproved.IncreasingthehalfwidthofGaussianwindowwillimprovemigrationimagingaccuracy,butifitistoo large,imagewillbedistorted.AshalfwidthGaussianbeamdecreases,imagingaccuracyincreases,butifitistoo small,shallowaccuracydecreases.WhenGaussianbeamcenterintervalisreduced,imagingaccuracyisimproved,butimagingefficiencybecomeslower.Withtheincreaseofvelocitymodeloverallsmoothingtimes,imagingaccuracygraduallyincreases.Whenvelocitymodelissmoothed50times,migrationimagingeffectisbest |
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Keywords:
Gaussianbeammigration
coreparameters
smoothmodel
imagingquality
computationalefficienc
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