--> ABSTRACT: Structural Analysis of Inversion Structures in the Belanak Area, West Natuna Basin, Indonesia, by Mario G. Coral, Ken McClay, Nick J. Comrie-Smith, and Pedro Restrepo-Pace; #90913(2000).
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ABSTRACT: Previous HitStructuralNext Hit Analysis of Previous HitInversionNext Hit Structures in the Belanak Area, West Natuna Basin, Indonesia

Coral, Mario G.1, Ken McClay2, Nick J. Comrie-Smith3, and Pedro Restrepo-Pace1
(1) CONOCO INC, Houston, TX 
(2) Royal Holloway University of London, Egham, Surrey, United Kingdom 
(3) Conoco, Indonesia, Jakarta, Indonesia

This paper presents a Previous HitstructuralNext Hit analysis of Previous HitinversionNext Hit structures in the Belanak area utilising 3D seismic data to establish the timing of Previous HitinversionNext Hit and pre-Previous HitinversionNext Hit Previous HitstructuralNext Hit controls on fault and fold development.

The study area includes a number of high relief, NE-SW striking, asymmetric anticlines - the Kerisi, Hiu, Tawes and Belanak oil and gas fields. Sediments comprise pre-Miocene fluvial and lacustrine syn-rift, with Late Oligocene to Recent fluvial, lacustrine and marine post-rift, syn-Previous HitinversionNext Hit and post-Previous HitinversionNext Hit strata. These overlie a pre-Tertiary metamorphic and granitic basement.

The Previous HitinversionNext Hit structures are characterised by fault-propagation folds with steep to overturned frontal limbs and gently dipping back limbs.

Mapping of the basement shows that the initial Oligocene rift architecture was characterised by a series of en-echelon half-graben systems with associated relay ramps, separated by two NW-SE trending accommodation or transfer zones. During Previous HitinversionNext Hit these rift systems were reactivated and linked, and the Cumi-Cumi transfer zone was reactivated as a negative flower structure with minor right lateral displacement.

The onset of Previous HitinversionNext Hit can be seen at sequence boundary SB300 (Late Oligocene) based on stratigraphic thinning and onlap onto the flanks of the Belanak and Tawes anticlines. Growth stratal and axial fold surface analysis demonstrate that the Previous HitinversionNext Hit event was episodic, and locally extends beyond SB1000 (Late Miocene), into the post-Previous HitinversionNext Hit Muda Formation.

An understanding of the timing of these Previous HitstructuralTop events gives an insight into clastic reservoir distribution and permits more rigorous modelling of the petroleum system of the area.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia