Publications

Bangadua (BDA) Field, located in the Onshore North-West Java Basin (NWJB), comprises eight wells and has produced 1.77 MMSTB of oil and 13.94 BSCF of gas since 2005, primarily from four layers in the Upper Cibulakan Formation. However, the Cisubuh Formation, which consists of sand-shale intercalation reservoirs, has been overlooked due to reports involving shallow gas hazards, such as gas craters and drilling kicks. In contrast, nearby fields like Randegan and Jatibarang have successfully developed this formation, achieving an average production of 1 MMscfd of gas per well.

This study aims to assess the potential of the Cisubuh Formation in the BDA Field by transforming these hazards into opportunities. For instance, a kick during drilling in BDA-006 revealed that the total gas presence and methane concentration from mud logging can reach 2,200 units with 424,000 ppm, respectively. Mud logs from five other wells also indicate promising potential zones concentrated at depths of 400-650 m MD. Additionally, a crater issue in BDA-002, which forced perforation in a non-primary interval at the shallow zone, revealed a CO2 content of 19% in the Cisubuh Formation – lower than in the Upper Cibulakan Formation and the two nearby fields.

With increasing gas demand in West Java, the development of stranded gas fields is projected to accelerate, including the BDA Field with commercialization expected to begin in early 2026. Due to limited data availability, this study aims to estimate the potential of the Cisubuh Formation in the Bangadua Field using a material balance approach, supplemented with analogous field data, revealing a gas-in-place volume exceeding 2 BSCF. There is potential to recover up to 1.85 BSCF of gas through two wells, supporting the field’s gas commercialization plan. The results could stimulate further exploration of shallow gas resources in the NWJB.