Publications

The Gulf of Thailand consists of a series of Tertiary age extensional basins. The reservoirs in these basins are predominantly fluvial channels and overbank sands. These reservoirs show rapid lateral changes and it is not easy to map them on the basis of conventional seismic data. Therefore, a geophysical workflow was devised to image sand distribution more effectively in the area using well log and seismic data from the Pattani basin in the Gulf of Thailand. Rock physics analysis was applied to well log data in order to identify lithology sensitive rock properties. Rock physics analysis shows that P-impedance and Vp/Vs have limited lithology discrimination capability beyond certain depth and density can successfully differentiate sand and shale intervals at all levels. Model-based simultaneous inversion technique was used to create various data volumes in order to better image sand body geometries at reservoir levels of interest. The inverted data volumes of P-impedance and density were compared at well locations. P impedance volumes are useful to depths of 1800 meters but at greater depths the density gave better sand body definition. The time and horizon slices from these data volumes successfully image fluvial sand systems.