Pico, Antonio (Pacific Rubiales Energy) | Aboud, Jesús (Pacific Rubiales Energy) | Parraga, Felipe (Pacific Rubiales Energy) | Martinez, Jose Antonio (Pacific Rubiales Energy) | Lopez, Gonzalo (Pacific Rubiales Energy)
The central region of the Llanos Basin in Colombia has been characterized by an extensional structural style, where the overall fault pattern consists of normal faults oriented approximately N30°E, dipping East. The structures of the oil fields in Casanare Province have been defined by this type of faults. In this work we establish, for the Casanare Province, the existence of compartmentalized structures formed by the junction between N60° E en-échelon faults and N30E normal faults. In this interpretation, en-échelon faults and folds play a major role in oil accumulations. 3D seismic multi attributes, including volume curvature, coherency and ant tracking, were used to reduce the uncertainties associated with the seismic and well data in order to improve geological constraints, in folds, faults and associated fracture zones. As a result, a new strike-slip fault pattern was interpreted, consistent with a wrench zone, as proposed by Wilcox, et al (1973).
This work presents the well-test management design and interpretationmethods that have been implemented to evaluate the exploratory wells of thePlataforma Deltana Project, in the Eastern Venezuela basin. The proposedmethodology has been applied to an exploratory well drilled in this project, itis an offshore gas-condensate well located near the border of Venezuela andTrinidad & Tobago. One important aspect that is emphasized in this work isthe need to test exploratory offshore wells to obtain the basic reservoir andwell productivity parameters, and to provide an estimate of the recoverablereserves associated to the well drainage area. The methodology is based on theintegration of seismic, geology and petrophysical information, to optimize thedesign and time of the tests. In order to elaborate the particular well testingprogram in the best economical way, time is a critical factor in any offshorewell, in addition to get focused on layer evaluation and determining producingfluids properties. In this work the evaluation results obtained from theimplementation of this methodology in two sands is presented.