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Hydrocarbon Prospectivity in the Eastern Coastal Swamp Depo-belt of the Niger Delta Basin: Stratigraphic Framework and Structural Styles

By Chidozie Izuchukwu Princeton Dim

Detailed studies have been carried out within the Middle to Late Miocene sequence of the Niger Delta basin using well logs, biostratigraphic, paleobathymetric, hydrocarbon type/occurrence and seismic data integrated with sequence stratigraphic tool. This involved interpretation aimed at understanding the sequence stratigraphic framework and structural styles to better unravel possible hydrocarbon leads and prospects at the intermediate and deeper intervals of the Eastern Coastal Swamp depobelt of the onshore Niger Delta basin. Facies interpretations reveal the occurrence of four lithofacies units; namely (a) sandstones facies, (b) shaly sandstone facies, (c) mud-rock facies, and (d) heterolithic facies. Well log sequence stratigraphic interpretation and correlation across these fields indicates that ten major stratigraphic bounding surfaces, five each of sequence boundaries (SB) with ages ranging from 13.1 Ma through 8.5 Ma and maximum flooding surfaces (MFS) with ages between 12.8 Ma and 7.4 Ma respectively, were identified and correlated. Four depositional sequences were delineated and stratigraphic flattening at various ages (MFSs) indicates that there is a shift of the depo-center from north to south. Stacking patterns (progradational, retrogradational and aggradational) were delineated and interpreted as lowstand systems tract (LST), highstand systems tract (HST) and transgressive systems tract (TST) using their bounding surfaces. The alternation of the LST, HST and TST offers good reservoir sands and source/seal shales for hydrocarbon accumulation. Paleobathymetric maps show generally that sediments were deposited within neritic through bathyal environments at different times, aligning with the progradational pattern of deposition of the Niger Delta. The environment of deposition spans through inner mid-shelf, shelf margin and slope margin constituting incised valley and channel-filled deposits. Horizon and faults that were mapped and interpreted in seismic volume shows that the stratigraphy of the area were greatly influenced by structures as sediment deposits thicken down-dip of the down-thrown section of the bounding faults. Structural interpretations reveal the occurrence of back to back (horst block-trapezoid zone), collapse crest structures, simple/faulted rollovers, regional foot walls/hanging walls and sub-detachment structures dominating within the mainly extensional zone and these constitute the major hydrocarbon traps in the area. The distribution of hydrocarbon types is such that gas is concentrated at the proximal end (northern section), oil and gas at the central part while oil predominates at the distal end (towards the southern part). Generally, structural and stratigraphic framework has shown that indeed there exist zones at intermediate and deeper intervals with booming amplitudes and well-developed trapping mechanisms that have not been drilled. These form possible hydrocarbon leads that should be subjected to further revalidation. Hence, an evaluation of lithofacies, depositional environment, stratigraphy, structures, reservoirs, seals, hydrocarbon types and distribution is critical in hydrocarbon prospectivity at intermediate and deeper depths across the eastern Coastal Swamp depobelt of the Niger Delta.

Published: 01/01/2017

Size: 4.91MB

Searching for the National Nugget-the Teachers of Teachers

By Maduewesi, Ebele N.

Searching for the National Nugget-the Teachers of Teachers

Published: 28/03/2018

Size: 556.64KB

Basic Ideas and Principles Concerning Teaching

By Maduewesi, Ebele N.

Basic Ideas and Principles Concerning Teaching

Published: 28/03/2018

Size: 861.65KB

Media for Population; Education and Communication

By Nwafor, Oby M.

Media for Population; Education and
Communication

Published: 28/03/2018

Size: 2.27MB

Collecting Data

By Nwachukwu, Chris Ezechi

Collecting Data

Published: 24/03/2018

Size: 434.02KB

Designing Appropriate Methodology in Vocational and Technical Education for Nigeria

By Nwachukwu, Chris Ezechinyere

Designing Appropriate Methodology in Vocational and Technical Education for Nigeria

Published: 24/03/2018

Size: 13.05MB

Designing a Research

By Nwachukwu, Chris Ezechi

Designing a Research

Published: 24/03/2018

Size: 516.83KB

An Investigation into the Teaching of Local Crafts in Primary Schools in Anambra State

By Nwafor, Oby M.

An Investigation into the Teaching of Local Crafts in Primary Schools in Anambra State

Published: 23/03/2018

Size: 564.58KB

JME Preparation Series

By Olaitan, S.o, and Obanya, Pai

JME Preparation Series

Published: 23/03/2018

Size: 7.75MB

Junior Secondary Agriculture for Schools Teacher’s Handbook.

By Youdeowei, Anthony, Ogbazi, J.n, et al

Junior Secondary Agriculture for Schools Teacher’s Handbook.

Published: 23/03/2018

Size: 3.06MB

Introduction To: Educational Measurement and Evaluation.

By Ogbazi, J.n, Ali, A, et al

Introduction To: Educational Measurement and Evaluation.

Published: 23/03/2018

Size: 19.21MB

A Philosophical Re-Direction of Agricultural Education.

By Ogbazi, N.j

A Philosophical Re-Direction of Agricultural Education.

Published: 23/03/2018

Size: 1.09MB

Implementing The Secondary School Agriculture Programme Under the 6-3-3-4 System

By Ogbazi, N.j

Implementing The Secondary School Agriculture Programme Under the 6-3-3-4 System

Published: 23/03/2018

Size: 1.87MB

The Contributions Of Nursery Education in the Development of Nigerian Child

By Ogbazi, N.j

The Contributions Of Nursery Education in the Development of Nigerian Child

Published: 23/03/2018

Size: 1.16MB

A Strategy for Providing Occupational Guidance in the Nigerian Primary Schools.

By Ogbazi, N.j

A Strategy for Providing Occupational Guidance in the Nigerian Primary Schools.

Published: 23/03/2018

Size: 1.29MB