Abstract

In recent years most oil-related seismic surveys have been 3D surveys. But there has also been an increasing interest in obtaining more sophisticated 2D profiles. The high amplitude reflections were very successful in early seventies for direct detection of gas. The AVO technique later emerged as a powerful tool in seismic industry for direct detection of gas in clastic reservoirs. The change in ratio of P wave velocity to S wave velocity causes the partitioning of the incident wave to differ for the case of a gas-sand/shale or gas-sand/wet