Implementation of volume interpretation in revealing upside potential in a mature field, the sangatta oilfield: A case study

Abstract

The Sangatta field is a shallow, medium sized oilfield, located in prolific Kutai Basin and was discovered in 1939. Field production begun at 1972. Primary production derives from Mid Miocene fluviodeltaic reservoir. Three deep exploratory wells drilled on crestal position in mid 70's failed to encounter reservoir quality rock and paleontologically exhibited deeper marine environment. Following conventional structural interpretation based on 3D shot in 1993, a comprehensive 3D volume interpretation was conducted recently. This new method facilitating combination between conventional 3D interpretation with the power of visualization, which enable interpreting of simultaneous multiple seismic attributes as single object that improve degree of confidence. This method eventually has revealed subtle seismic signature that can be interpreted as volumetrically significant geologic body that possess reservoir quality and becoming an attractive exploration target. Further to this study, 4 deep exploratory wells are scheduled to be drilled during this year drilling campaign.