Rock physics & Interpretation

[RP-04] Delta Reservoir Characterization Using Complex Trace Seismic Attribute and Acoustic Impedance Inversion Method Case Study on KX Field

*Rahadian Anggit Wirawan¹, Supriyanto Supriyanto¹, Yayan Sofyan¹, Dede Djuhana¹, Waluyo Waluyo¹, Abdul Harris¹ (1. Universitas Indonesia (Indonesia))

KX field in North Borneo Tarakan Basin has the potential to be developed as a gas field. Through the KX-1 well drilling, reservoir zones in the Field KX is a delta sandstone reservoir. This study aims to get the character of reservoir delta and support in decision making field development.In the delta sandstone reservoir environment, which has many variety of depositional enviromnent , is a challenge in the development field. The quality and distribution of reservoir sandstones is uneven in delta environment. With the method of seismic acoustic impedance inversion and complex trace seismic attribute, determining the character of reservoir delta of Tarakan Formation has been successfully carried out.The sandstone reservoir distribution of Tarakan Formation has been deliniated in lateral extent with acoustic impedance interpretation. Depositional environment of sandstone reservoir of Tarakan Formation has been reconstructed by interpretation of complex trace attributes.The integrated interpretation of the instantaneous frequency and the reconstruction of depositional environment can then be determined for sandstone reservoir Tarakan Formation zones that have good quality and separated non-reservoir zones.The direction of development in KX field has been carried out with the integrated interpretation of acoustic impedance inversion and complex trace attributes. Reservoir sandstones that have good quality range in 4300-5800 (m/s*g/cm³) and porosity 20-30%. The initial gas in place reserves are estimated worth 156.21 BCF.