Title : Unlocking field development through infill well success delivering 3,000 BOPD via integrated dynamic analysis and seismic reprocessing: Lima field, PHE ONWJ
Abstract:
LAMI Field is one of the key oil and gas producers in Offshore Northwest Java. A major contributor within the field is the LAMI-30 reservoir zone, historically supported by high-performance wells such as B-13, which peaked at 3,000 BOPD in 2015, and B-12ST, which peaked at 1,500 BOPD in 2016. Subsequent workovers in surrounding wells yielded significantly lower rates (100–200 BOPD), while new infill wells drilled in 2021 near B-12 and B-13 encountered decreasing resistivity, consistent with previous mapping results. Based on this evidence, initial evaluation suggested that LAMI-30 had relatively small oil-in-place, optimally produced only by B-12 and B-13, leading to a decision to hold further development.
In 2023, a new approach was introduced using advanced dynamic analysis to reassess the reservoir. Stable production from B-12 and B-13 provided the foundation for building a Multitank MBAL model, which divided LAMI-30 into several dynamic tanks. The eastern area was characterized as a high-producer tank associated with higher permeability, while the central area corresponded to a low-producer tank with lower permeability. This analysis, integrated with Flowing Material Balance (FMB), Rate Transient Analysis (RTA), and Decline Curve Analysis (DCA), identified additional connected volumes and demonstrated that oil-in-place could be more than doubled compared to earlier estimates.
In 2024, seismic reprocessing using the QFWI-PSDM method further enhanced subsurface imaging and reservoir understanding. This reprocessing was necessary due to the presence of substantial gas within the Parigi and Pre-Parigi carbonate formations, which had blurred amplitude responses in the oil-bearing layers including LAMI-30. The updated interpretation revealed new structural potential in the southern and eastern areas of LAMI-30, refining the dynamic tank model and increasing the total oil-in-place to nearly three times the original assessment.
These insights directly guided the next phase of infill drilling. Based on amplitude anomaly mapping, well B-16 was drilled in 2024 between B-12 and B-13, delivered 1,160 BOPD without negatively impacting offset wells. In 2025, E-5ST targeted the newly recognized southern structure and achieved 3,000 BOPD, with reservoir pressure measurements aligned with Multitank MBAL predictions.
This integrated workflow—combining Multitank MBAL, FMB, RTA, DCA, and reprocessed QFWI-PSDM seismic—successfully unlocked untapped reserves that were not recognized in earlier analyses. The results represent a step-change in reservoir understanding and hold promise for sustainable future development of LAMI-30 through additional infill opportunities.
Keywords: Multitank MBAL, Dynamic Analysis, Seismic Reprocessing, QFWI-PSDM, Infill Drilling
