Clay mineralogy and pressure analysis from seismic information in Krishna‐Godavari basin, India

Interval transit time data derived from seismic velocities have been analyzed to predict clay mineralogy and overpressures from compaction trends in the offshore areas of Krishna‐Godavari basin located on the east coast of India. Compaction trends from rms velocity fairly well match the trends obtained from sonic logs. This study has been extended to the undrilled part of the basin with the help of seismic information. Areal distribution of clay mineral types has been determined from the compaction trends. Prospective areas are identified on the basis of clay mineral distribution and overpressure zones related to the areas of different clay mineral associations.