Publications

Prior to commencing high-cost seismic acquisition, proper design of optimum parameters to achieve optimal results within the geophysical, operational and budgetary constraints is crucial and this is no less so than in the early stages of Indonesias coalbed methane (CBM) development. The designed parameters, which are deduced from synthetic modeling of seismic response of an appropriate subsurface model, will be used as references in the acquisition The seismic response is simulated using acoustic finite difference scheme and various responses of different recording parameters are then analyzed. The advantage of using finite difference over other modeling algorithms is its ability to model any acquisition setup from surface reflection seismic to borehole seismic. Furthermore, the response produces all physically possible wave types, providing a more intuitive than, for example, ray tracing which suffers in complex media due to its reliance on Fermat first arrival. The unique properties of the CBM reservoir, which is characterized by thin coal beds, require highresolution seismic data in order to be able to map its subsurface distribution. This study demonstrates how different choices of acquisition parameters can affect the simulated seismic response. The results are then analyzed and used to justify or revised the proposed acquisition parameters.Key words: Modeling, CBM, Acquisition, FiniteDifference