Abstract
Summary West Timor is a promising frontier area for petroleum exploration known for its complex geological and structural condition in its onshore area. Notwithstanding its complexity, the petroleum system in this area was found to be functioning. This study aims to integrate gravity data and subsurface results to construct an onshore-offshore geological model of West Timor and to estimate the basement depth and model in the onshore area by conducting gravity analysis. The result shows a significant impact in proposing a new extensive geological model that stretches out from onshore to an offshore area of West Timor. The research concludes that there are 4 deformation zone based on how deep and old the detachment surface cut the sediment sequence into. The detachment surfaces lie in older sediment from zone to zone, or northward, as it also cuts deeper sediment and lift older sediment in each zone. Petroleum system potential has its highest opportunity in zone 1 and decreasing towards zone 4, northward, since it is highly deformed.
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