Publications

The Sepinggan Field is located offshore east Kalimantan, and is composed of a complexly faulted series of deltaic sandstone, shals, and minor carbonates. In the deltaic section the only consistent, mappable lithostratigraphic units are coals. There are over 100 reservoir zones spanning a section of more than 5,000 feet (1525 meters), ranging from middle to late Miocene.A severe time limitation for reserves certification required that an accurate structural model be built for the field in a matter of weeks. Before.this study, a comprehensive model of all reservoirs did not exist. Conventional means of building the model for this thick, complexly faulted section and its numerous reservoirs posed a challenging task which would require a significant amount of time and effort, and would never be achievable in the short time available. A new approach was needed. Newly available automated fault modeling and infill gridding techniques provided the tools to accomplish the task in the time required.Seven key seismic- events and 31 faults were interpreted, mapped, and depth converted over the field. These key reference horizons and faults formed the structural framework to infill grid the 102 intervening well markers, which were essential for determining the field's reservoir description and hydrocarbon reserves. Confidence in the model was confirmed by using three dimensional visualization and back interpolating every grid to known well markers. A significant reduction in the structural modeling and reserve calculation cycle time was achieved and the certification process was able to proceed on time.