The method can be used to compute large residual static corrections in complex 3d near - surface areas such as areas covered by desert and gebi . 5 ) based on 2d refraction statics method in cmp domain , 3d refraction static method of cmp domain is presented 該方法是在二維基礎(chǔ)上發(fā)展的,在折射界面起伏不大的情況下,它可以同時(shí)解決三維cmp道集中長波長靜校正和短波長靜校正問題,可適用于塔里木沙漠、長慶黃土塬覆蓋區(qū)。
According to these accomplishments , several techniques are expounded emphatically in this paper , including 3d refraction statics , coherent noise suppression by prestack wave field separating ( prestack fx noise attenuation ) , 3d prestack multiple domain random noise attenuation , multiples attenuation , nmo of unsymmetrical hyperbola , dynamic replacement of wave equation , surface - inconsistent residual static , super bin stacking , poststack depth migration and prestack depth migration . all the techniques have been applied in seismic processing of 2d , 3d and wide - line profiling and obtained good results 本文根據(jù)項(xiàng)目組研究成果,重點(diǎn)閘述了三維折射波靜校正技術(shù),疊前波場分離相干噪音壓制方法(疊前fx去噪) ,疊前三維多域隨機(jī)噪音衰減技術(shù),多次波衰減技術(shù),非對(duì)稱雙曲線動(dòng)校正技術(shù),波動(dòng)方程動(dòng)態(tài)替換技術(shù),非地表一致性的剩余時(shí)差靜校正技術(shù),超面元迭加處理技術(shù),疊后深度偏移處理,疊前深度偏移處理等。
In this dissertation , the method of field primary static correction and refraction statics are applied together is given firstly , avoid the fault of using refraction static alone ; compile the program of calculating static values , studying the automatic residual statics multiple iterating technique . practical data processing shows that the static correction processing flow given in this dissertation is feasible 本文首次使用了野外靜校正和折射波靜校正聯(lián)合處理的方法,避免了折射波靜校正孤立使用的缺點(diǎn),編制了計(jì)算低降速帶靜校正量的應(yīng)用程序,研究了自動(dòng)剩余靜校正的多次迭代技術(shù),在塔里木地區(qū)地震資料處理應(yīng)用中,見到了明顯效果。
The clues and techniques to improve the resolution of data processing are 1 ) removing the affection of near surface factors on data acquisition , including static correction and noise eliminating technique etc , 2 ) broadening the frequency band of pre - stack seismic data , including amplitude compensation and pre - stack deconvolution etc , 3 ) improving s / n ratio of high frequency and weak reflection signals through multiple coverage with high precision velocity analysis , residual static correction and high - order nmo , raising " dead line of high frequency reflection " , and 4 ) identifying post stack effective reflection frequency band , enhancing dominant frequency and so on 主要包括:消除近地表因素對(duì)資料采集的影響,包括靜校正和噪音壓制技術(shù)等;疊前拓寬地震資料領(lǐng)帶,包括振幅補(bǔ)償和疊前反褶積技術(shù)等;借助高精度速度分析、剩余靜校正和高次項(xiàng)nmo技術(shù),通過多次覆蓋疊加,消除資料中隨機(jī)噪聲干擾、提高資料信噪比,尤其是高頻端反射信息的信噪比,改善高頻反射和弱反射信號(hào)信噪比,提高“高頻反射死亡線” ;疊后有限反射頗帶識(shí)別、抬高優(yōu)勢頻率等。