--> Regional-Scale Analysis of Flow Processes in the Llanos Basin, Colombia, by S. Bachu, J. C. Ramon, M. Villegas, and J. Underschultz; #90986 (1994).

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Abstract: Regional-Scale Analysis of Flow Processes in the Llanos Basin, Colombia

S. Bachu, J. C. Ramon, M. Villegas, J. Underschultz

The Llanos basin, consisting of Cambrian to Recent predominantly siliciclastic sediments, is a foreland sub-Andean basin situated in Colombia between the Cordillera Oriental and Guyana Precambrian Shield. Stratigraphic, petrophysical, fluid properties, pressure and geothermal data from 318 wells located in the central and southern parts of the Llanos basin have been used to analyze at a regional scale the main fluid and heat flow processes taking place presently in the basin. The salinity of formation water is low, indicating that the basin has probably been flushed by meteoric water. The pressure regime in the basin is generally hydrostatic or slightly sub-hydrostatic. The flow of formation waters is driven by topography, buoyancy caused by thermal expansion, and underpressuring caus d probably by erosional pore space rebound. The geothermal regime is controlled by basement heat flow, depositional and compaction factors, and hydrodynamic effects. The heat flow in the basin is moderate. Geothermal gradients decrease generally with depth and westward toward the thrustfold belt. All the available information has been synthesized into a regional-scale integrated model of fluid and heat flows in the Llanos basin, to be presented.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994