本文選題：反射莫霍面成像 + 層間多次波壓制�。� 參考：《海洋地質與第四紀地質》2017年02期

【摘要】：深部地質結構是研究海盆動力成因的重要基礎。南海西南次海盆以往多道地震資料中莫霍面的成像普遍不清,選取NH973-1測線長排列多道地震數據對西南次海盆的莫霍面反射成像進行研究。該地震資料中層間多次波非常發(fā)育,嚴重掩蓋或干擾了莫霍面有效反射信號。針對地震資料特征,首先采用拋物線型Radon變換濾波對部分層間多次波進行壓制以拾取一個相對準確的初始速度,在此基礎上進一步采用速度濾波和內切除組合方法對層間多次波進行壓制。從資料處理效果看,層間多次波得到有效壓制,莫霍面成像清晰,呈現出斷斷續(xù)續(xù)的特征。由此解釋的海盆區(qū)地殼(除沉積層外)厚度整體較薄,約為2.3~3.9km,有別于正常洋殼結構,更接近于構造拉伸主導型的地殼。
[Abstract]:The deep geological structure is the important foundation of studying the dynamic origin of the basin. The imaging of Moho surface in the southwest subbasin of the South China Sea is generally unclear. The reflection imaging of the Moho surface of the southwest subbasin of the South China Sea is studied by selecting the NH973-1 line length and arranging the multi-channel seismic data. The multiples between the middle layers of the seismic data are very developed, which masked or interfered with the effective reflection signal of Moho surface seriously. According to the characteristics of seismic data, parabolic Radon transform filter is firstly used to suppress partial interlayer multiples to pick up a relatively accurate initial velocity. Furthermore, the interlaminar multiples are suppressed by the combination of velocity filtering and internal resection. From the effect of data processing, interlayer multiples are effectively suppressed, Moho imaging is clear, and it presents intermittent characteristics. The thickness of the crust (except sedimentary layer) in the basin is relatively thin, about 2.3 ~ 3.9km, which is different from the normal oceanic crust structure and is closer to the tectonic-extensional crust.
【作者單位】： 中國科學院邊緣海與大洋地質重點實驗室中國科學院南海海洋研究所;中國科學院大學;
【基金】：國家自然科學基金項目(91328205,41376062) 729工程項目(GZH20110205)
【分類號】：P631.4;P736
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本文編號：1976902