--> Abstract: Fracture Modeling Based from Lithologic Controls, Geometry and Tectonic Evolution in the Llanos Foothills, Colombia, by Alberto Ortiz, German D. Mesa, and Ruth X. Beltran; #90078 (2008)

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Fracture Modeling Based from Lithologic Controls, Geometry and Tectonic Evolution in the Llanos Foothills, Colombia

Alberto Ortiz1, German D. Mesa2, and Ruth X. Beltran2
1Instituto Colombiano del Petroleo, Ecopetrol S.A., Piedecuesta, Colombia
2Alianza TSP, Bucaramanga, Colombia

Fracture modeling of the Central Colombian Llanos Foothills (CLF) has been developed in several phases involving field studies, core characterization, development of a Discrete Fracture Network (DFN), characterization of fracture properties and dynamic validation, in order to generate a more realistic static model that allows a better dual porosity reservoir simulation that ends in best reservoir depletion practices. Lithologic controls, named here as superfacies, were found related to sedimentary environments, grain size and structural position. Geometry of geobodies contributes to fracture clustering and distribution over the structure crest and flanks. The DFN in the CLF was based on restoration, validation and structural analysis, ending in a model representing the geometry and the structural kinematics of the area. It was built starting from an analysis of the geometric structures of the fields and the relationship of stress in the behavior of fracture and effort-deformation due to the historic tectonic events happened in the area. Using commercial modeling software available, 3D fracture models were built based on the information of cores, UBI logs, outcrop data and production data in several fields of the Colombian Foothills. The obtained DFN allow to define best crest and flank positions for fracture development. Microimaging analysis confirmed that fractures planes are usually multi-layered and predominantly open in several directions. Two parallel families were related with the tension-extension stresses and two other were related to the flank and the fold shape. Uncertainties related about fracture length and density, can be reduced with careful and integrated production data analysis.

 

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas