中山大学学报（自然科学版）
中山大學學報（自然科學版）
중산대학학보（자연과학판）
ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS SUNYATSENI
2014年
1期
141-147
,共7页
叠前反演%梯度面板%质量控制%反演策略%波形反演
疊前反縯%梯度麵闆%質量控製%反縯策略%波形反縯
첩전반연%제도면판%질량공제%반연책략%파형반연
pre-stack inversion%gradient panel%quality control%inversion strategy%waveform inversion
对反演的中间过程进行质量控制可有效改善反演过程的适定性及反演结果的可信度。采用反射率法正演模拟、共轭梯度法反演的正反演体系，在反演过程中将不同慢度数据计算的梯度排列形成慢度-深度域梯度面板。梯度面板反映的是对应不同入射角（即不同水平慢度）的数据所提供的梯度，具有类似偏移中共成像点道集的含义。再利用梯度面板分别对反演的初值、分频反演中的频带选择、分层反演中的层段选择以及分慢度反演中的慢度选择等方面进行质量控制。模型测试表明基于梯度面板的质量控制是可行的。
對反縯的中間過程進行質量控製可有效改善反縯過程的適定性及反縯結果的可信度。採用反射率法正縯模擬、共軛梯度法反縯的正反縯體繫，在反縯過程中將不同慢度數據計算的梯度排列形成慢度-深度域梯度麵闆。梯度麵闆反映的是對應不同入射角（即不同水平慢度）的數據所提供的梯度，具有類似偏移中共成像點道集的含義。再利用梯度麵闆分彆對反縯的初值、分頻反縯中的頻帶選擇、分層反縯中的層段選擇以及分慢度反縯中的慢度選擇等方麵進行質量控製。模型測試錶明基于梯度麵闆的質量控製是可行的。
대반연적중간과정진행질량공제가유효개선반연과정적괄정성급반연결과적가신도。채용반사솔법정연모의、공액제도법반연적정반연체계，재반연과정중장불동만도수거계산적제도배렬형성만도-심도역제도면판。제도면판반영적시대응불동입사각（즉불동수평만도）적수거소제공적제도，구유유사편이중공성상점도집적함의。재이용제도면판분별대반연적초치、분빈반연중적빈대선택、분층반연중적층단선택이급분만도반연중적만도선택등방면진행질량공제。모형측시표명기우제도면판적질량공제시가행적。
The stability and reliability of inversion can be modified and improved by controlling the qual-ity of inversion intermediate results.The reflectivity modeling method and conjugate gradient inversion method are used in this paper.In the process of inversion,the negative gradient is lined up according to the horizontal slowness to form the negative gradient panel in a slowness-depth domain.In the negative gradient panel the gradient represents the contribution provided by data with different incident angles (i.e.different horizontal slowness or ray parameter).Thus,the negative gradient panel has the similar meaning as the common imaging point gather in migration and can be used for tool controlling process of inversion.The roles of quality control that the negative gradient imposed on the process of inversion are discussed from the following aspects:the rationality assessment of the inversion initial value;the correct-ness evaluation of parameter selection when using three inversion strategies,especifically,the correctness evaluation of the frequency-band selection in frequency-division inversion,the correctness evaluation of the layer segment selection in layer-division inversion,and the correctness evaluation of the slowness components selection in slowness-division inversion.The test using model indicates that the quality con-trol for inversion intermediate results based on negative gradient panel is feasible.
