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ZHANG Dong, DU Qing-huai, XU Xiao-kun. Optimized 6th order NMO correction for long-offset seismic data[J]. Northwestern Geology, 2004, 37(4): 117-120.
Citation: ZHANG Dong, DU Qing-huai, XU Xiao-kun. Optimized 6th order NMO correction for long-offset seismic data[J]. Northwestern Geology, 2004, 37(4): 117-120.

Optimized 6th order NMO correction for long-offset seismic data

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  • Received Date: March 10, 2004
  • Revised Date: July 21, 2004
  • Published Date: December 04, 2004
  • The conventional 2nd order NMO assumes a small offset-to-depth ratio and straight raypaths.The accuracy for the travel-time calculations decreases significantly with increasing offset-to-depth ratio.The 2nd order NMO may be improved by extending the hyperbolic approximation with higher order (4th, 6th) series.Conventional NMO is a small offset approximation, therefore, the explicit truncation of the higher order terms generates significant errors in the travel-time calculations at long offsets.Hence, the 2nd order approximation is not suitable for velocity analysis, AVO study, and CMP stack using long offset seismic data.In this paper, we in troduce a more accurate travel-time approximation which we called the optimized 6th order NMO equation.The accuracy of the new and proposed equation is better than Taner's 6th order equation because the truncation error is smaller.Even though we truncate Taner's expansion to the 6th order, we take all other higher orders terms into account as well.The tests using synthetic and real data show that our optimized 6th order long offset NMO equation works well.The improvement at long offsets is more significant than Taner's 6th order truncation.
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