A regional gravity and magnetic survey was flown over the onshore and offshore Tarakan Basin, North Kalimantan, covering over 90,000 sq km.

The gravity data were acquired using SGL’s AIRGrav airborne gravity system.  Over 17,000 lkm of data were acquired in 2015 at a line spacing of 8,000 m.   The survey’s objective was to define the regional structural architecture, including mapping the geometry of the local grabens associated with basin formation.

Structural traps in the Tertiary-age deltaic basin are typically dip-oriented anticlines and growth-fault related closures developed in response to sediment loading and later deformation.

Hydrocarbon exploration started over 100 years ago, with several significant onshore oil and gas fields defined by the 1980’s.  More recently, offshore oil and gas fields such as Tulip East and Aster have been defined.