Abstract
ABSTRACT A pilot study project is presently carried out in the unconsolidated low gravity oil sands of the Orinoco Oil Belt, in the eastern part of Venezuela, one of the largest heavy oil accumulations in the world. The objective is to evaluate the interactions and environmental impact of Compaction and Subsidence due to fluid withdrawal. Thirteen injection-production and two observation wells were drilled for this purpose. The optimal location of the latter was determined after detailed log evaluation of the injection-production wells. The logging program for the observation wells was designed for a thorough evaluation of the geological, petrophysical, and geomechanical reservoir characteristics. In addition, a large number of radioactive bullets were placed along the boreholes, in the observation wells, for compaction or deformation monitoring. This paper presents the results of the extensive logging program carried out including those of the Field Subsidence Monitoring Tool (FSMT). The methodology used in the evaluation of the shaly intercalations on sands is particularly referred.
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