In the Malay basin often shallow gas leakage and presence of partially gas saturated sands are major issues in seismic imaging and often the presence of gas results in poor quality, low S/N-signal-to-noise ratio “washed-out” vertical bands in seismic sections causing challenges in seismic data processing and interpretation. Although gas cloud imaging may be improved through shear waves, in the following examples acoustic models have been used to illustrate the impact of internal multiples in contributing to the complexity of imaging and illumination issues in Malaysian gas-sands & gas-cloud present environments. The examples illustrated in this abstract clearly show the impact of gas-sand and gas-cloud presence on wave-propagation in a simple geological setting.


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