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Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion

Uncertainty in structural complexities and rock heterogeneities is a major challenge that controls oil exploration and drilling operations in the rift basins of Sudan. Wide ranges of depositional environments developed within these reservoirs: e.g., fluvial, shallow and deep lacustrine, fluvio-delta...

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Main Authors: Mahgoub, Mohamed, Padmanabhan, Eswaran
Format: Conference or Workshop Item
Published: 2012
Subjects:
QE Geology
Online Access:http://eprints.utp.edu.my/7602/1/Mahgoub_2011.doc
http://eprints.utp.edu.my/7602/
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spelling my.utp.eprints.76022014-04-08T13:07:24Z Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion Mahgoub, Mohamed Padmanabhan, Eswaran QE Geology Uncertainty in structural complexities and rock heterogeneities is a major challenge that controls oil exploration and drilling operations in the rift basins of Sudan. Wide ranges of depositional environments developed within these reservoirs: e.g., fluvial, shallow and deep lacustrine, fluvio-deltaic systems. Multi-phase rift development from rift initiation to late post-rift introduced good oil traps and very heterogeneous reservoir rocks situations. Advances in seismic inversion techniques and AVO analysis maximize the probabilities of valid interpretation and lithology delineation in such rift structures thereby reducing the associated uncertainty limit. Accuracy of interpretation depends on the quality of seismic data. Therefore, there is an urgent need to introduce innovative techniques in seismic processing to improve seismic resolution prior to any inversion work. This paper explains an-integrated workflow using seismic inversion applied for detailed interpretation and advanced reservoir characterization applications in these rift basins. This workflow involves three phases: starting with detailed sedimentological analysis; next AVO seismic inversion; finally cross validation and uncertainty analysis. The seismic data conditioning and inversion workflow implementation comprises three main steps: beginning with data conditioning (seismic and logs), wavelet estimation, and relative acoustic impedance inversion (RAI).The conditioned seismic and RAI volumes are used to improve the interpretation of horizons and build a low-frequency model (LFM). The final step of the workflow is to perform absolute acoustic impedance inversion (AAI), porosity transformation, and depth conversion. Using rock physics analysis for well logs, the acoustic impedance and porosity relationship at the reservoir intervals is cross-correlated and established. This relationship is used to transform high-resolution acoustic impedance inversion to porosity and, subsequently to identify facies and lithological variations. The results of this study show that seismic resolution and interpretation can be improved using AVO seismic inversion. 2012 Conference or Workshop Item PeerReviewed application/msword http://eprints.utp.edu.my/7602/1/Mahgoub_2011.doc Mahgoub, Mohamed and Padmanabhan, Eswaran (2012) Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion. In: IPTC 2011, February 7-9, 2012, Bangkok, Thailand. http://eprints.utp.edu.my/7602/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic QE Geology
spellingShingle QE Geology
Mahgoub, Mohamed
Padmanabhan, Eswaran
Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
description Uncertainty in structural complexities and rock heterogeneities is a major challenge that controls oil exploration and drilling operations in the rift basins of Sudan. Wide ranges of depositional environments developed within these reservoirs: e.g., fluvial, shallow and deep lacustrine, fluvio-deltaic systems. Multi-phase rift development from rift initiation to late post-rift introduced good oil traps and very heterogeneous reservoir rocks situations. Advances in seismic inversion techniques and AVO analysis maximize the probabilities of valid interpretation and lithology delineation in such rift structures thereby reducing the associated uncertainty limit. Accuracy of interpretation depends on the quality of seismic data. Therefore, there is an urgent need to introduce innovative techniques in seismic processing to improve seismic resolution prior to any inversion work. This paper explains an-integrated workflow using seismic inversion applied for detailed interpretation and advanced reservoir characterization applications in these rift basins. This workflow involves three phases: starting with detailed sedimentological analysis; next AVO seismic inversion; finally cross validation and uncertainty analysis. The seismic data conditioning and inversion workflow implementation comprises three main steps: beginning with data conditioning (seismic and logs), wavelet estimation, and relative acoustic impedance inversion (RAI).The conditioned seismic and RAI volumes are used to improve the interpretation of horizons and build a low-frequency model (LFM). The final step of the workflow is to perform absolute acoustic impedance inversion (AAI), porosity transformation, and depth conversion. Using rock physics analysis for well logs, the acoustic impedance and porosity relationship at the reservoir intervals is cross-correlated and established. This relationship is used to transform high-resolution acoustic impedance inversion to porosity and, subsequently to identify facies and lithological variations. The results of this study show that seismic resolution and interpretation can be improved using AVO seismic inversion.
format Conference or Workshop Item
author Mahgoub, Mohamed
Padmanabhan, Eswaran
author_facet Mahgoub, Mohamed
Padmanabhan, Eswaran
author_sort Mahgoub, Mohamed
title Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
title_short Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
title_full Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
title_fullStr Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
title_full_unstemmed Enhancing the Interpretation of Rift Structures in Sudan Using AVO Analysis and Seismic Inversion
title_sort enhancing the interpretation of rift structures in sudan using avo analysis and seismic inversion
publishDate 2012
url http://eprints.utp.edu.my/7602/1/Mahgoub_2011.doc
http://eprints.utp.edu.my/7602/
_version_ 1738655588596842496
score 13.211869

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