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The Soapaga Fault Trishear Related Deformation: A Restoration of the Betéitiva Syncline in the Eastern Flank of the Floresta Massif – Colombia

LACR Andes Basins Research Symposium 2020
AAPG Distinguished Lecture

Author: German Andres Pardo Torres, Universidad Nacional de Colombia

In the eastern flank of the Floresta Massif, the area between the Paz de Río and Corrales localities is characterized by the presence of oil seeps. These occurrences are related to the Betéitiva Syncline, an NNE trend structure that has been explained by different classic fault-related folds models. However, none of these models explain its structural position in the footwall of the deformational front, the overturned-to-upright position of the backlimb, and the thickness changes in the backlimb. Here, I used a Trishear kinematic model associated with the Soapaga Fault deformation to better explain the Betéitiva Syncline and its structural features. Restoring five structural cross-sections I found that the geometry of the Betéitiva Syncline, its structural position in the footwall, and the thickness changes in the backlimb could be better explained by a Trishear kinematic model related to the deformation of the Soapaga Fault. For the Trishear restoration process, I searched the best fit values for the p/s, slip, Trishear angle and fault angle parameters using the simulated annealing algorithm to avoid local minima. The results of the inversion show changes in the Trishear parameters for the five cross-sections, and suggest the deformation of the Soapaga Fault varies along its trace. In this works I conclude two main points; the Betéitiva Syncline is better explained by the Trishear kinematic model related to the Soapaga Fault, showing lesser shortenings than the previous structural works of this folds, and it is a best-fit model related to the geological data in the field; and the Soapaga Fault split into the Corrales Fault, a later structure that thrusted the Betéitiva Syncline backlimb and uplifted the Cretaceous units.


German Andres Pardo Torres, Universidad Nacional de Colombia

German earned a BSc in Geology from the Universidad Nacional de Colombia, and is a MSc in geology candidate from the same university.

During his 9 years of experience in the industry, he has worked in consulting companies in Colombia. Currently, he is Structural Geologist at the Hydrocarbon Division of the Colombian Geological Survey in Bogotá, where he is responsible for structural analysis of fracture patterns, kinematic evidences, and deformational processes related to Unconventional Shale Reservoirs.

German Andres is a member of AAPG.

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