Stochastic 3-D Modeling of the M-19 Heavy Oil Block for Supporting Further Development, Eastern Venezuelan Basin

Benzaqueni, Isaac¹, Antonio Brunal², Jose Fleitas¹, Jehan Anton² (1) Petroleos de Venezuela, S.A, Puerto La Cruz, Venezuela (2) Roxar Inc., Houston, TX

An integrated study of the Block M-19 Cerro Negro Field (64 Km2) was performed to characterize Morichal member of Oficina formation (Miocene). The Block is located in the eastern Orinoco heavy oil belt and is not developed.

The field structure is a monocline slightly dipping toward the north with normal faults with east-west direction. The reservoir contains unconsolidated sandstones deposited in a trasitional environment of a deltaic type on upper zones and a fluvial type on the lower zones.

Channel belts and flooding planes have a frequency of 47.8 and 41.3% respectively and lower zones presented channel belts frequency greater than 70%.

A high resolution modeling grid was built using corner point geometry to distribute facies and petrophysical 3D using geostatistical tools.

Input data included lithologs and well log evaluations from 100 wells, interpreted 3D seismic horizons and a conceptual facies model.

A sequential indicator simulation technique was used to distribute facies in the 3D vol­ume and sequential gaussian simulation for porosity and permeability

Ten realizations were produced and compared in order to measure uncertainty. As a result of this study, The Oil in Place volume (9 MMMSTB) was characterized and distributed vertically through Facies Vertical Proportion curves and laterally through variograms based on existing facies maps and well data.

This model will be used in the dynamic modeling stage to plan the further development of the field which includes 7 cluster (15 horizontal and/or multilateral wells each one) and to maximize the oil recovery, estimated in 1100 MMSTB.