Acoustic Reverse-time Migration using Optimal Staggered-grid Finite-difference Operator Based on Least Squares

• Autorzy: Yan H. , Yang L. , Liu H.

Identyfikatory

DOI

10.2478/s11600-014-0259-9

• Języki publikacji: EN

Abstrakty

EN

Reverse-time migration (RTM) directly solves the two-way wave equation for wavefield propagation; therefore, how to solve the wave equation accurately and quickly is very important for RTM. The conventional staggered-grid finite-difference (SFD) operators are usually based on the Taylor-series expansion theory. If they are used to solve wave equation on a larger frequency content, a strong dispersion will occur, which directly affects the seismic image quality. In this paper, we propose an optimal SFD operator based on least squares to solve acoustic wave equation for prestack RTM, and obtain a new antidispersion RTM algorithm that can use short spatial difference operators. The synthetic and real data tests demonstrate that the least squares SFD (LSSFD) operator can mitigate the numerical dispersion, and the acoustic RTM using the LSSFD operator can effectively improve image quality comparing with that using the Taylor-series expansion SFD (TESFD) operator. Moreover, the LSSFD method can adopt a shorter spatial difference operator to reduce the computing cost.

Słowa kluczowe

EN

migration; difference operator; image quality; least squares

PL

migracja; jakość obrazu; metoda najmniejszych kwadratów

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2015
• Tom: Vol. 63, no. 3
• Strony: 715--734
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr.

Twórcy

autor

Yan H.

• Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

autor

Yang L.

• Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
• University of Chinese Academy of Sciences, Beijing, China

autor

Liu H.

• University of Chinese Academy of Sciences, Beijing, China

Bibliografia

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