Stratigraphic Traps in Distal Lacustrine Delta, A Case History from Greater Sirikit East Field, Phitsanulok Basin, Central Plain, Thailand

Greater Sirikit East oil and gas field is located just to the east of the Sirikit Main field in the S1 concession, Phitsanulok<br>Basin, Thailand. The main reservoirs are fluvio-deltaic Lan Krabu formation members of K, L and M that interfinger with the<br>open lacustrine Chumsaeng formation. Hydrocarbon traps in the field can be grouped into structural and stratigraphic traps.<br>Numerous small structural closures have been proven to be hydrocarbon bearing. Delineation and development well drillings<br>have also proven the working stratigraphic trap system in the absence of structural trap. In some structural closure, observed<br>hydrocarbon column heights from well data exceed their relevant structural spill point, invoking the larger working<br>stratigraphic trap system responsible for the hydrocarbon accumulation.