OPTIMAL ROCK PROPERTY TRENDS IN NORMAL PRESSURE FORMATIONS IN AN OFFSHORE NIGER DELTA FIELD

Onuorah, Loretta O. and Nwozor, K.K (2014) OPTIMAL ROCK PROPERTY TRENDS IN NORMAL PRESSURE FORMATIONS IN AN OFFSHORE NIGER DELTA FIELD. Petroleum & Coal, 56 (1). pp. 87-98. ISSN 1337-7027

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Abstract

Rocks as natural materials are inhomogeneous and anisotropic with the implication that their physical properties are never the same but rather vary in depth, time and space. A good understanding of rock parameters at deep and challenging settings helps improve the interpretation of essential explo-ration data. Vital to this improved knowledge is the need to establish a threshold of normal and standard rock property behaviours in target areas in order to detect abnormal trends that could be critical to exploration success. Analyses of rock property trends in a normally pressured reservoir in Offshore Niger Delta have been carried out using wireline log data such as sonic, density, resistivity and gamma ray logs. The petrophysical workflow involved the generation and interpretation of cross-plots of density – Vp, and Poisson’s ratio - Vp; and depth trends of Vp, Vs, density, acoustic impedance and Poisson’s ratio for sands and shales. A predictable linear relationship exist in these plots; it is normal for velocity, density and acoustic impedance trends to increase with depth due to progressive mechanical compaction while Poisson’s ratio decreases with depth.

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:	02 May 2019 14:10
Last Modified:	02 May 2019 14:10
URI:	http://eprints.gouni.edu.ng/id/eprint/1436

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