ICE 2022


Biogenic gas currently remains under-developed in proven oil pool Central Sumatra Basin. A review based on regional gravity data and sampled well data along the basin has been conducted to evaluate basin-scale prospective resources. A basin-scale analysis on the biogenic gas preferable area has been conducted using gravity data to investigate paleo-high distribution within the Central Sumatra Basin. A thorough analysis of Binio (Lower Petani) Formation as a proven biogenic gas reservoir and most likely source rock has been evaluated on the selected well which represents the distribution and heterogeneity of the Basin. Gas Formation evaluation, temperature gradient, paleoenvironment, and sedimentation rate were used to evaluate the potency of biogenic gas generation. The model calculates the maximum yield of biogenic methane gas as a function of source sediment volume. Integration to the distribution of paleo-high and sedimentation concepts provides a model of the biogenic gas province as a clearer guide into the untapped prospective area for biogenic gas accumulation within the Basin. The model suggests the total maximum yield of biogenic gas exceeds 400 TCF and considering migration factors, such as migration loss through time and diffusion/leakage, the potential trapped biogenic gas resources in Central Sumatra Basin is approximately reached up to 12 TCF. This biogenic gas has a potential accumulation in the structural trap, stratigraphic trap, and the combination of both structural and stratigraphic. Currently, only one-tenth of resources has been proven and producing a sweet dry biogenic gas in Central Sumatra Basin. The production activity of biogenic gas has shown an economic sound and effective production cost. The exploration concept and biogenic gas province model in the Central Sumatra Basin may reveal significant resources of untapped biogenic gas and could potentially fulfill increasing gas demand in the near future.