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The Apiay–Ariari oil field of the Llanos Basin, Colombia, is located within a structurally complex area. A 3-D seismic survey was necessary to understand the structural factors controlling the distribution of hydrocarbons within the field. The results of the interpretation were used in conjunction with core, production, and log data to complete an integrated reservoir evaluation. Time structure maps were converted to depth using geostatistical techniques which resulted in a more detailed realization of strike-slip, normal, and reverse faults, consistent with a right lateral shear system. The 3-D interpretation is also much more simplified than the 2-D interpretation. This integrated study realized an increase of field reserves of greater than 60.7 million bbl over those originally calculated. The study also identified several exploration plays, such as that successfully tested by the Gavan-1 well. The ability to fully integrate the new 3D seismic information with all available data resulted in a more accurate understanding of structural components responsible for the trapping of hydrocarbons within the Apiay–Ariari fields. This knowledge has proven to be essential for proper management of the field development.

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