--> Abstract: Detailed Structural Analysis and Fracture Modeling of the Tetuan Formation, San Francisco Field, Upper Magdalena Basin, Colombia, by David Richards, A. Kloppenburg, M. F. Doe, E. Gomez, W. J. Clark, Y. Z. Ma, J. Pavas, and L. E. Goyeneche; #90039 (2005)

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Detailed Structural Analysis and Fracture Modeling of the Tetuán Formation, San Francisco Field, Upper Magdalena Basin, Colombia

David Richards1, A. Kloppenburg1, M. F. Doe1, E. Gomez2, W. J. Clark2, Y. Z. Ma2, J. Pavas3, and L. E. Goyeneche3
1 Midland Valley Inc, Golden, CO
2 Schlumberger DCS, Denver, CO
3 Hocol S. A, Bogota, Colombia

The Tetuán Formation in the San Francisco field is a fractured reservoir, of low matrix porosity and permeability, with significant additional production potential. Realizing this potential depends on better understanding the fracture network, to aid both development well planning and reservoir modeling.

A discrete fracture model (DFN) was developed for the Tetuán Fm., based on 18 image logs, detailed mapping of the field from a 3D seismic survey, geometric and strain characteristics of the mapped horizons, and concepts of fracture development in this tectonic and structural setting. The objective was to model the fractures and sub-seismic scale faults in the Tetuán in order to better understand their distribution and influence on production, and thus serve as a guide to further Tetuán tests.

The fracture populations in the image logs were analyzed by type across the field, by type for each well and by type and formation for each well. These analyses led to recognition of systematic fracture sets. Characteristics that help define the fracture model include: relative timing of the sets and their relationship to the deformation history, intensity distribution by set, average orientation and deviation of orientation by set, stratigraphic and spatial distribution, and which sets tend to be open or closed.

The resultant DFN takes into account the measured fracture characteristics, the deformation history, detailed geometric and strain characteristics of the unit. This type of fracture modeling adds tremendously to the typical approach of interpolating between data points at wells, and yields insights for development.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005