How integration of well log, core, borehole seismic and cross-well seismic data can offer a powerful tool in complex structural situations

This work presents a methodology for resolving a complex structural reservoir using the acquisition and interpretation of diverse core, well log, VSP, and cross-well data. The Carito reservoir is in Eastern Basin of Venezuela, north of Monagas. The production formation is located between 13 000 and 17 000 ft in Tertiary and Cretaceous sands within the Naricual and San Antonio formations. In August 1999, two new wells were drilled in the southern part of the Carito Field. The locations of the new wells were based upon a structural model derived from existing surface seismic data. When these wells were drilled, the top of the producing formation was encountered at substantially different depths than was predicted, indicating that the structure of the area was much more complex than previously understood. We concluded that a detailed evaluation of all available data should be undertaken.