【摘要】：可控震源作為地震勘探的信號源已得到廣泛應用。數(shù)據(jù)處理技術的進步催生了許多提高可控震源施工效率的方法,但這些方法或多或少存在一些缺點,如滑動掃描方法的諧波干擾強,多震源同時激發(fā)方法因同時掃描信號之間的相關性導致鄰炮干擾強,距離分離的同時掃描方法需投入眾多裝備。本文引入分頻同時掃描(FS3)方法,通過信號切分、重組實現(xiàn)多震源同時掃描,利用不同頻率之間的互不相干特性,將一個目標掃描信號分離成若干不同或相關性很小頻帶的子信號,實現(xiàn)無鄰炮干擾或干擾最小的同時掃描,然后把所有同點包含一個目標掃描信號的子信號(掃描數(shù)據(jù))重組為該點的觀測數(shù)據(jù)輸出形成單炮記錄。因該方法可增強特定頻帶(尤其是低頻)的能量,故既能減少由非線性掃描帶來的諧波干擾,還可使記錄中各頻帶輸出能量均衡。
[Abstract]:Vibroseis have been widely used as signal sources for seismic exploration. The advancement of data processing technology has given birth to many methods to improve the construction efficiency of vibroseis, but these methods have some disadvantages more or less, such as the strong harmonic interference of sliding scanning method. The simultaneous excitation method of multiple seismic sources results in strong interference from adjacent guns due to the correlation between simultaneously scanned signals, and the simultaneous scanning method of distance separation needs a lot of equipment. In this paper, the frequency division simultaneous scanning (FS3) method is introduced. By signal segmentation and recombination, multi-source simultaneous scanning is realized, and the incoherence between different frequencies is utilized. The scanning signal of a target is separated into several sub-signals with different or very small correlated frequency bands to realize simultaneous scanning without or with minimal interference from adjacent guns. Then, all the sub-signals (scanning data) containing a target scan signal at the same point are recombined to output the observation data at that point to form a single shot record. Because this method can enhance the energy of special frequency band (especially low frequency), it can not only reduce the harmonic interference caused by nonlinear scanning, but also equalize the output energy of each frequency band in the recording.
【作者單位】： 中國石油東方地球物理公司國際勘探事業(yè)部;
【基金】：國家重點研發(fā)計劃深地專項項目(2016YFC0601100)資助
【分類號】：P631.4
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本文編號：2353761