Application of High-Frequency SEA Cycles in Standardizing Reservoir Nomenclature for Cluster Geomodelling

The standardized reservoir nomenclatures as proposed in this paper is based on case study of C and D clusters in western part of Sarawak basin, The clusters consist of 17 fields.

Among undeveloped discovered fields, the legacy reservoir well tops are not using same equivalent nomenclature, which introduced by different operators in different time, even though a distance between field is very close proximity. Within D cluster, among the fields have different reservoir naming such as R1 to R9.2, RII to RI, Amp-A to Amp-Q, U-M-H-L, etc while at C cluster has only Sarawak Cycle naming without reservoir naming (n. n = no name). All previous works have not applied recent high-frequency SEA Cycles. This high- frequency sequence bio-stratigraphic scheme has been established for the Southeast Asian basin included Malaysian basin ( Morley et. al., 2021 ). This 4th-order depositional sequence scheme can be inferred by re-analysing existing biostratigraphic data available for 5 wells in the study clusters area.

Building 3D reservoir model by combining several fields in the cluster required a standardized reservoir nomenclature, not only supported by biostratigraphy and arbitrary well-to-wells seismic transects, pressure and fluid connectivity, but also for proper HIIP volumetric reporting for each field in the cluster.