Satun Field is located on the west flank of the Pattani Basin, Basin, near the geographic center
of the Gulf of Thailand in block 11 and 12. The Satun structure consists of a series of complexly faulted north-south trending graben-center anticlinal and faulted three-way closures. Normal faults strike subparallel to the structural axis.

The Satun structural trend is approximately 45 km long and 10 km wide extending from block 12 north into the southern portion of block 11. The trend can be divided into three structural domains;
northern and southern grabens and central monocline. The central monocline is formed by a northeast
shift of the structural (graben) axis from south to north and is a target of future exploration. Due' to
structural and stratigraphic complexity a seismic datum shift occurs on maps between the north and south graben areas. This stratigraphic and structural complexity is a vestige of slightly different structural history in each major structural domain.

The main gas sands are Middle to Lower Miocene non-marine fluvial sandstones deposited by meandering streams. A myriad of fluvial facies serve as reservoirs but point-bars, incised channels and anastamosed chanels predominate.   

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