Many of the important Gulf of Thailand reservoirs are fluvial sandstones within the early to late Miocene. The fluvial sandstones vary considerably with respect to channel size, orientation, and sinuosity, making accurate reservoir characterization difficult as many of them are below seismic resolution. The stratigraphic architecture of the Miocene to Pleistocene succession in The Gulf of Thailand has been investigated by integrating seismic geomorphology, well logs, and biostratigraphic data.

The Oligocene to early Miocene depocenter was controlled by synrift faulting and was adjacent to the large basin bounding faults. Oligocene lacustrine sediments are overlain by an early Miocene fluvial...