3D Geomechanical reservoir model for Appraisal and Development of Emi-003 field In Niger Delta, Nigeria
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Date
2018-12
Journal Title
Journal ISSN
Volume Title
Publisher
Ajast
Abstract
In this paper, geomechanical parameters were effectively integrated in 3-D geostatic model of Emi-003 reservoir in the Niger Delta basin, Nigeria for
deformability and rock strength appraisal using well logs and 3D seismic volume. Unconsolidated sandstone and compacted shale were delineated
and evaluated by determined elastic moduli (Poisson ratio, Young modulus, Bulk modulus, Shear modulus and Compressibility) and the Unconfined
compressive strength (UCS) using sonic logs and petrophysical analysis, correlations and cross plots for comparison of the evaluated reservoir
strength, physical properties (such as modulus, porosity, velocity) of the five mapped zones from five vertical wells in the studied reservoir for
validation were done. Finally, incorporation of elastic properties, unconfined compressive strength in 3D static model of the studied reservoir was
carried out to capture strong lateral variance of rock elastic moduli and strength into areas where well control may not exist. especially off the well
points. The results show average parameters of the weakly cemented sand to have lower Poisson ratio, Young, Bulk, Shear modulus and Unconfined
compressive strength (0.27, 2.3GPa, 10.8GPa, 6.91GPa, 14.21MPa respectively,) high compressibility and porosity (0.13 GPa-1, 0.26) conversely
the compacted shale have higher Poisson ratio, Young, Bulk, Shear modulus and rock strength as (0.36, 8.91GPa, 18.05GPa, 21.09GPa, 56.44MPa
respectively) lower compressibility and porosity (0.05 GPa-1, 0.05 respectively). There is a marked increase of rock strength and elastic moduli with
relative decrease in porosity. The mechanical failure in the NNW direction of the reservoir will be relatively lower than other areas as analyse using
the 3D earth model. The information gathered will help manage reservoir stress and strain induced during development and maximize reservoir
performance, while mitigating risk.
Description
Keywords
3-D Geomechanical model, Elastic moduli, Petro physical properties, Niger Delta
Citation
Osaki, Lawson-Jack, Etim D. Uko, Alex Opara.I(2018) Cosmological Elastic Moduli with Geomechanical reservoir model for appraisal and development of Emi-003 field with 3-D.