Publications

Tanjung II CBM Field is located in the eastern edge of Barito Basin which is composed of thin sediments of Paleogene and thick sediments of Neogene, Upper Warukin formation. This formation has potency as CBM reservoir in this field. The rank of coal in this formation is lignite to sub-bituminous C. This area has limited 2D/3D seismic data and well data, so the previous study on CBM potential and resources was not optimal. The available 2D/3D seismic data is used for conventional hydrocarbons exploration and it is generally targeted for intervals deeper than CBM reservoir. Meanwhile, most of CBM reservoirs are shallow (less than 1000 m) and the coal seam thickness is usually below the tuning thickness. Limited seismic resolution will make structural interpretation and stratigraphic correlation inaccurate and this will impact the quality of coal reservoir delineation, modeling and also resources estimation of CBM. In this study, Basis Pursuit Inversion (BPI) method is used for 2D seismic processing and coal zone delineation of Upper Warukin formation. By using this method, some coal seams can be separated from one another. This enhancement automatically raises the dominant frequency of 2D seismic data from 22 to 35 Hz and improves seismic resolution without significantly deteriorating signal-to-noise ratio. Moreover, the unresolved seismic data can be reconstructed without involving any well in inversion process. Therefore, this method is suitable to be utilized in an exploration area which has no or only few wells data available.