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GARCIA, EDUARDO, Corpoven, S.A., Caracas, Venezuela

ABSTRACT: Hydrocarbon Segregation from Well Logs, Northern Monagas, Venezuela

A methodology is described to determine vertical hydrocarbon density variations in recent oil discoveries in Northern Monagas state, using well logs.

Similarities and differences are established for models obtained in El Carito and El Tejero fault block-s. These models were confirmed using independent information, such as PVT analysis, RFT pressures, oil gravity and GOR's from initial production tests.

To explain differences between the modelas, an hypothesis is proposed for the migration/segregation/deformation sequence in these two blocks, which accounts for the presence of lighter hydrocarbons in El Tejero block, even though it is 1700 ft structurally lower than El Carito.

Based on this hypothesis, westward projection of the models predicts lighter hydrocarbons and similar porosities for Casupal-Mata Grande and Tonoro blocks, at depths considerably greater than in El Tejero block.

AAPG Search and Discovery Article #90988©1993 AAPG/SVG International Congress and Exhibition, Caracas, Venezuela, March 14-17, 1993.