本文選題：散射波 + 等效偏移距��； 參考：《長安大學》2015年碩士論文

【摘要】：散射波是一種廣義上的地震波,而在地下地質(zhì)構(gòu)造中產(chǎn)生散射波的條件是普遍存在的。散射波成像方法是針對傳統(tǒng)反射方法難以解決的復雜地下地質(zhì)構(gòu)造問題所提出來的,其具有重要的現(xiàn)實意義和應用前景。關于散射波的研究亦是當今地震勘探領域中的前沿課題。論文首先對散射波成像理論進行了系統(tǒng)的回顧,并以基于等效偏移距的共散射點(CSP)道集為基礎,系統(tǒng)研究了散射波成像技術,并編程實現(xiàn)了CSP道集的抽取以及基于等效偏移距偏移(EOM)散射成像方法軟件,同時引入了加權疊加的思想。此外,考慮到小間距CSP道集高密度信息工程技術需求,增加了CSP道集等距道加密采樣功能。其次,針對不同地質(zhì)構(gòu)造特點,通過構(gòu)建模型、地震記錄正演數(shù)值模擬;依托傳統(tǒng)反射成像和散射成像方法處理結(jié)果的對比分析,著重討論了散射成像的關鍵參數(shù)(如速度、等效偏移距孔徑、等效偏移距步長等)對最終成像結(jié)果的影響。進而就EOM散射成像方法軟件工程運用與參數(shù)選擇給出了建議。最后,為檢驗EOM散射波成像方法軟件的有效性,針對經(jīng)典地震地質(zhì)模型Marmousi資料,實施了復雜波場散射波成像測試性處理研究,并取得了較為理想的成果。在此基礎上,進一步選用關中地區(qū)中深層反射地震長剖面資料(44km)完成了實測數(shù)據(jù)試處理研究工作,結(jié)果表明EOM散射成像方法特別適用于低信噪比資料成像處理技術需求,并且能夠有效改善深部復雜構(gòu)造影像資料品質(zhì)。散射波成像技術的理論前提更貼近地下實際情況,雖然散射理論提出已有相當長的時間,但其在解決實際生產(chǎn)問題中還處于探索階段,隨著技術的不斷發(fā)展,該技術亦會得到完善,從而為地震勘探處理提供巨大幫助。
[Abstract]:Scattering wave is a kind of generalized seismic wave, but the condition of producing scattering wave in underground geological structure is universal. The scattering wave imaging method is proposed to solve the complex geological structure problem which is difficult to be solved by the traditional reflection method. It has important practical significance and application prospect. The study of scattering waves is also a frontier subject in the field of seismic exploration. Firstly, the theory of scattering wave imaging is reviewed systematically, and the scattering wave imaging technique is systematically studied based on the CSP gather based on equivalent offset. The software of CSP gathers extraction and scattering imaging based on equivalent offset migration (EOM) is programmed and the idea of weighted stacking is introduced. In addition, considering the need of high density information engineering technology of small spacing CSP gathers, the encryption sampling function of CSP gathers is added. Secondly, according to the characteristics of different geological structures, the forward modeling of seismic records is built, and the key parameters of scattering imaging, such as velocity, are discussed based on the comparison and analysis of the processing results of traditional reflection imaging and scattering imaging methods. The effect of equivalent offset aperture and equivalent offset step on the final imaging results. Furthermore, some suggestions on the application of EOM scattering imaging software and parameter selection are given. Finally, in order to verify the validity of the EOM scattering wave imaging software, a study on the testability of complex wave field scattering wave imaging is carried out for the classical seismic geological model Marmousi data, and a more satisfactory result is obtained. On the basis of this, the experimental data processing work is completed by selecting the long section data of medium-deep reflection seismic data (44km) in Guanzhong area. The results show that the scattering imaging method is suitable for the imaging technology of low SNR data. And it can effectively improve the quality of deep complex structure image data. The theoretical premise of scattering wave imaging technology is closer to the actual underground situation. Although the scattering theory has been put forward for quite a long time, it is still in the exploration stage in solving the practical production problem, with the development of the technology, The technology will also be improved, thus providing great help for seismic exploration processing.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P631.4

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本文編號：2118543