Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field

3D post-stack time migrated seismic data and a suite of composite well log data from six wells drilled within the “AFUN” field Niger delta were used to effect a detailed interpretation of the field. This was with a view to delineating architectural elements that control reservoir quality of a deepwa...

Full description

Bibliographic Details
Main Author: Yemisi C. AJISAFE
Format: Article
Language:English
Published: Earth Science Institute, Slovak Academy of Sciences, Slovakia 2021-03-01
Series:Contributions to Geophysics and Geodesy
Subjects:
Online Access:https://journal.geo.sav.sk/cgg/article/view/260
id doaj-c4acf5cc0a1e401fb8e029e1a48b70d2
record_format Article
spelling doaj-c4acf5cc0a1e401fb8e029e1a48b70d22021-03-19T08:06:59ZengEarth Science Institute, Slovak Academy of Sciences, SlovakiaContributions to Geophysics and Geodesy1338-05402021-03-015118310810.31577/congeo.2021.51.1.5260Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” FieldYemisi C. AJISAFE0Department of Geology, Ekiti State University, Ado-Ekiti, Nigeria3D post-stack time migrated seismic data and a suite of composite well log data from six wells drilled within the “AFUN” field Niger delta were used to effect a detailed interpretation of the field. This was with a view to delineating architectural elements that control reservoir quality of a deepwater turbidite reservoir. The data analyses were done using the Petrel software. LAS file of logs were imported into the Petrel software as well as SEG.Y. seismic data. Fault interpretation and horizon mapping were based on the well-seismic tie from the generated seismogram. Time and depth structure maps were created. Thirty faults which include growth faults, reverse faults, collapsed crest structure and as well as faults that are synthetic and antithetic to the growth faults were mapped. The growth faults are believed to act as pathways for the updip movement of hydrocarbon from the Akata Formation to Agbada Formation. The structural interpretation showed that the area has been subjected to compressional deformation which resulted in reverse faulting system in toe thrust zone influenced by shale diapirs. The maps revealed contour closures that belong to an anticlinal structure which is forming traps in the reservoirs. The structures are faulted North-South trending rollover anticlines. It has also been shown that the distribution and type of architectural elements i.e. fractures within the fan system have major impact upon the reservoir distribution, continuity and connectivity of sand/shale bodies. The study concluded that structural style and facies architecture are the two fundamental elements that defined the reservoir heterogeneity of the “AFUN” Field.https://journal.geo.sav.sk/cgg/article/view/260architectural elements, faulting system, reservoir, structural, compressional deformation
collection DOAJ
language English
format Article
sources DOAJ
author Yemisi C. AJISAFE
spellingShingle Yemisi C. AJISAFE
Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
Contributions to Geophysics and Geodesy
architectural elements, faulting system, reservoir, structural, compressional deformation
author_facet Yemisi C. AJISAFE
author_sort Yemisi C. AJISAFE
title Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
title_short Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
title_full Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
title_fullStr Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
title_full_unstemmed Evaluation of the reservoir architectural elements in deepwater turbidites of Niger Delta – a case study from the “AFUN” Field
title_sort evaluation of the reservoir architectural elements in deepwater turbidites of niger delta – a case study from the “afun” field
publisher Earth Science Institute, Slovak Academy of Sciences, Slovakia
series Contributions to Geophysics and Geodesy
issn 1338-0540
publishDate 2021-03-01
description 3D post-stack time migrated seismic data and a suite of composite well log data from six wells drilled within the “AFUN” field Niger delta were used to effect a detailed interpretation of the field. This was with a view to delineating architectural elements that control reservoir quality of a deepwater turbidite reservoir. The data analyses were done using the Petrel software. LAS file of logs were imported into the Petrel software as well as SEG.Y. seismic data. Fault interpretation and horizon mapping were based on the well-seismic tie from the generated seismogram. Time and depth structure maps were created. Thirty faults which include growth faults, reverse faults, collapsed crest structure and as well as faults that are synthetic and antithetic to the growth faults were mapped. The growth faults are believed to act as pathways for the updip movement of hydrocarbon from the Akata Formation to Agbada Formation. The structural interpretation showed that the area has been subjected to compressional deformation which resulted in reverse faulting system in toe thrust zone influenced by shale diapirs. The maps revealed contour closures that belong to an anticlinal structure which is forming traps in the reservoirs. The structures are faulted North-South trending rollover anticlines. It has also been shown that the distribution and type of architectural elements i.e. fractures within the fan system have major impact upon the reservoir distribution, continuity and connectivity of sand/shale bodies. The study concluded that structural style and facies architecture are the two fundamental elements that defined the reservoir heterogeneity of the “AFUN” Field.
topic architectural elements, faulting system, reservoir, structural, compressional deformation
url https://journal.geo.sav.sk/cgg/article/view/260
work_keys_str_mv AT yemisicajisafe evaluationofthereservoirarchitecturalelementsindeepwaterturbiditesofnigerdeltaacasestudyfromtheafunfield
_version_ 1724213134265155584