DERIVED ROCK ATTRIBUTE ANALYSIS AND INVERSION OF LAMDAMURHO FOR FLUID AND LITHO-LOGY PREDICTION IN NEMBE FIELD ONSHORE NIGER DELTA, NIGERIA

Aniwetalu, Emmanuel U. and Anakwuba, Emmanuel K. and Ilechukwu, Juliet N. and Omang, Benjamin Odey (2018) DERIVED ROCK ATTRIBUTE ANALYSIS AND INVERSION OF LAMDAMURHO FOR FLUID AND LITHO-LOGY PREDICTION IN NEMBE FIELD ONSHORE NIGER DELTA, NIGERIA. Petroleum & Coal, 60 (2). pp. 180-187. ISSN 1337-7027

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Abstract

Prediction of pore fluid and lithology using well log derived rock attributes alone are often associated with higher uncertainties. This could lead to inaccurate determination of formation properties. In this paper, integration of derived rock attributes and Prestack seismic inversion of Lame parameters reduced the uncertainties. The goal was to effectively discriminate fluid and lithology in the reservoir and predict hydrocarbon charged sand zones that could be revived for further drilling decisions. To achieve this goal, elastic attributes were generated from the well logs and appropriate pair of these attributes was cross-plotted to discriminate fluid and lithology. To improve the confidence of delineating bypassed hydrocarbon zones away from the current produncing zones, angle gather generated from the super gather of the prestack seismic data was inverted and data slices of lame impedances along the horizon of interest was extracted and analysed. The results of crossplot of velocity ratio versus Poisson’s ratio and acoustic impedance successfully distinguished between fluids and lithology in the area. Gas and oil charged sand exhibit low velocity ratio, Poisson’s ratio and acoustic impedance values. The results were also validated by the crossplot of LambdaRho versus MuRho from well logs. To delineate bypassed hydrocarbon away from well locations, data slices of the LambdaRho, and MuRho volumes were generated along HD2 reservoir. The results capture the hydrocarbon prospects at the known well locations and bypassed hydrocarbons away from the known locations which could be revived to increase production in the field.

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 11:53
Last Modified: 03 Jun 2019 11:53
URI: http://eprints.gouni.edu.ng/id/eprint/1647

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