DYNAMIC CHARACTERIZATION OF RESERVOIR STRESS USING SEISMIC INVERSION IN UDAM FIELD, ONSHORE NIGER DELTA

Aniwetalu, Emmanuel U. and Anakwuba, Emmanuel K. (2017) DYNAMIC CHARACTERIZATION OF RESERVOIR STRESS USING SEISMIC INVERSION IN UDAM FIELD, ONSHORE NIGER DELTA. Journal of Basic Physical Research, 7 (2). pp. 39-46. ISSN 2141-8403

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Abstract

Characterization of dynamic reservoir changes in Udam Field due to production process has been undertaken using elastic impedance inversion of two seismic data acquired at different vintages. This was achieved by deriving low frequency model (initial guess impedance) from the base and the monitor which were inverted to create elastic impedance profile of the formation. The elastic impedance profile revealed reservoir fluid saturations, pressure regimes and by-passed hydrocarbon with commercial concentrations in the northern part of well A, well B and well D at time intervals of 1400-1500ms, 1300ms-1400ms and 1200-1350ms respectively. The results also indicate that high injected fluid concentration, which is associated with high pressure and minimal hydrocarbon concentrations, occurs at time intervals of 1600-1750ms, 1500-1750ms and 1500-1700ms in well A, B and D respectively. Well C is the most depleted well with very high pressure effects. The elastic impedance cubes of the inverted volumes delineate the onset of stress and the closure stress initiated during and after fluid injection programmes. The onset of stress reveals the potential brittle zones at the central part of the field while the closure stress reveals the stress plate overlying the predicted brittle zones. The crossplot of differential horizontal stress ratio and elastic modulus of the area indicates the trend of the fracture zones to be southeast to northwest direction. This is also consistent with the injection pattern in the study area. Therefore, understanding the stress distribution in the reservoir is vital in the reservoir management and well completion strategy.

Item Type: Article
Subjects: L Education > L Education (General)
Q Science > Q Science (General)
Divisions: Faculty of Natural and Applied Sciences
Depositing User: miss ifeoma agbo
Date Deposited: 03 Jun 2019 11:56
Last Modified: 03 Jun 2019 11:56
URI: http://eprints.gouni.edu.ng/id/eprint/1648

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