Abstract
The purpose of this paper is to verify the velocity structure model of Kakkonda field which was officially announced by NEDO. This model consists of six layers with different velocities each other. For this purpose, we carried out 2-D simulations by the staggered grid finite-difference method and compared the results with actual seismic waves observed by the pit explosives of the well KT-208. First, to verify simulation program, we compared velocities of surface waves extracted from the field data with those appearing in the simulation results. Second, we confirmed that the source function used in the simulations is suitable for representing the source signature of the pit explosives. Afterwards, we compared travel times of P-wave first motions and those of the simulation. The differences were small with about-1 to 4%. Therefore, we have concluded that NEDO's model appropriately delineates the shallow velocity structure (<1 km deep) of the area to the northwest of the well KT-208 in Kakkonda field.
