Publications

B Field is one of the oil-producing contributors within Rokan Block, and it has untapped potential for further development. Its structural framework was formed by paleo-high basements, giving rise to local closures. The field is characterized by two significant closures: the North and South closures. Recent stratigraphic studies and evaluation show that B Field has a heterogeneous reservoir, especially within D Formation.

The previous development project, executed in 2018, only focused on an infill reduced spacing play type in the crestal arena at the South closure. However, drilling results from the last development of oil production wells show stratigraphic and oil saturation variations despite being located at the same relative structural height. Therefore, a comprehensive subsurface evaluation ensued, integrating log data, a recent stratigraphic analysis, and seismic attribute interpretation.

The project team proposed oil-producing wells within areas exhibiting suspected facies changes delineated by interpreted seismic-driven stratigraphic features based on evaluation results. These features were predominantly identified in the downdip structure rather than the crestal area. During the 2022-2023 development campaign, several wells, based on the interpreted seismic-driven stratigraphic features that are located at the downdip structure, were proven to produce high oil gain with a first test from B-58 at 3261 BFPD/ 533 BOPD/ 83.6% WC, B-60 at 3061 BFPD/1048 BOPD/65% WC, and B-72 at 2354 BFPD/ 2304 BOPD/ 2% WC. This success story reveals new potential for a development program scenario and the foundation for the project team to expedite the maturation of the next wells using the latest evaluation.