Velocity modeling through full wave equation traveltime tomography inversion based on sonic logging data
Nowadays,the targets of seismic exploration gradually transform from the shallow layers(<2000 m)to the middle and deep layers(2000~3500 m),and the velocity modeling with high precision is one of the key methods to achieve accurate seismic imaging.At present,the first-arrival or transmitted wave velocity tomography method is relatively mature,but the reflected wave tomography method,which is more important for deep velocity modeling,still faces difficulties in traveltime picking and huge amount of computation.Aiming at the difficulties faced by the current medium and deep traveltime velocity tomography methods,this paper proposes a wave-equation-based full-wave traveltime velocity tomography method with sonic logging data.The numerical results show that the new velocity tomography method in this paper not only overcomes the problem of the traditional reflected wave tomography modeling method due to the huge amount of calculation from the Born approximation,but also greatly improves the accuracy of velocity modeling in the middle and deep layers,and further improves the imaging quality of the middle and deep layers.
Sonic logging dataTraveltime tomographyPlane wave decompositionSparse inversionSeismic imaging