Publications

The Suban gas field is located in the Corridor Block, South Sumatra, Indonesia. It is the major contributor of the total gas sales from the Corridor PSC. The field has been on production since 2003 with commingled production from the Batu Raja, Durian Mabok, Talang Akar, and Fractured Basement formations. Suban is a fractured reservoir with fracture distribution being the major factor affecting well deliverability. Suban is divided into three compartments based on pressure data. Regular static-pressure surveys are conducted to update the material balance calculations. Historically, data acquisition in Suban has been limited. Production logging data is only available from the time each well initially came on production. An aggressive data acquisition program has been recommended for the future years to gain a better understanding of zonal contributions, individual well production, CGR (Condensate to Gas Ratio), and reservoir properties especially dynamic skin and wellbore dynamics. As the current field reservoir pressure is below the dew point pressure, prediction of declining condensate yield is proving to be challenging. Fracture identification and distribution modeling has been carried out in Suban with a combination of seismic, open-hole logging, coring and drilling parameters analysis. A “Halo model” approach assuming that the fracture intensity is related to the distance from major faults has been applied to the geomodel to represent areal and vertical fracture intensity and distribution. At the geomodel scale, a fine grid dual-porosity model was built and then upscaled to a single-porosity flow simulation model. This paper analyses Suban development and the challenges associated with it, beginning with geomodeling concepts followed by engineering data analysis and its complexities. Identification of fault patterns and the associated fracturing is critical for field development planning in a highly fractured field like Suban. Development planning of Suban field is a combination of additional wells, compression requirements and processing plant expansion.