Abstract：Using variable-grid finite-difference algorithm to carry out the seismic simulation has many unique advantages that mainly are more reasonable for discretization of geologic model,and relatively fine division of local grid can be implemented in low-velocity zone and complex structural area,which not only improves the simulated precision and eliminates the dispersion resulted from insufficient sampling,but also can reduce the requirement of computer memory,keeping the flexibility of model computation.The paper presented a new elastic wave numeric simulation method based on high-order staggered-gird technique,which realized the technique densifying local grid by changing the spatial step of grid,remedying the defect and shortcoming of ordinary grid.The testing results showed that the algorithm presented by the paper is characterized by good stability,improved precision of simulation,reducing computational time and improving computational efficiency.
