Abstract

The East Ketaling Field is situated in the South Sumatra Basin. The first well was drilled in 1982 by Pertamina – Jambi Oil, and found oil and gas accumulations in the deltaic sand bodies of the Tertiary Air Benakat Formation. Two delineation wells were drilled in the second half of 1983.

In this deltaic depositional setting, the lateral extent of sand bodies is generally limited, and their description in the early stage of the exploration phase is a key to the effective assessment of the field with a limited number of delineation wells. The method to tackle this problem is discussed using a data set from the East Ketaling Field.

The first step is well-to-well correlation using Principal Component (PC) logs and fault positions from the structural dip analysis of the dipmeter result. Correlation using PC logs is considered to have several advantages inclucing the reduction of large volumes of log data into a small number of PC logs. The resultant curves make the detection of large features much easier (50-100m long ramps and plateaus). Then a sand body analysis is performed using the stratigraphic dip result to deduce the sand type and geometry. These results are integrated into sand body correlations which in term are used to reconstruct the paleo-depositional setting and to evaluate hydrocarbon potential in the field. In addition, the results point out the potential areas for further delineation within the field.