Sequence Stratigraphic Analysis from Well Logs of an X-Field, Niger Delta, Nigeria

Candidate Maximum Flooding Surfaces (MFS) identified on Rho-1, Rho-2 and Rho-3 were the basis of correlation across the wells for sequence Stratigraphic analysis in the field. Three (3) candidate MFS which include MFS-1, MFS-2 and MFS-3 were identified using the method adopted by Okoli [1]. Erosional surfaces were also delineated in wells from the observed stacking pattern between a sequence from Galloway model (1989) leading to the correlation of SB-1 and SB-2 across the wells. Using the Galloway model, four (4) depositional sequences were inferred SEQ (1-4). In the first sequence (SEQ 1), deposition occurred in a transgressive episode. Depositional environment was interpreted from electrofacies and revealing stacked sequences of reservoirs predominantly composed of fluvial channels which incised the Upper and Lower Shorefaces on a delta front system. In SEQ 2, looking at the aggradational pattern of the sequence, the formed channels were under the influence of both tidal and fluvial systems. In SEQ 3 and 4, based on electro-facies, the stacked reservoir sands were deposited predominantly in a shoreface/delta front environment and channel incisions in a wave subjugated high energy deltaic setting. The entire well section showed deposition in a regressive phase. Proposed conceptual models were generated using Petrel software and could be used as an input reconstruction of subsurface geological models. Indicating correct orientation of geo-bodies and facies belts (pinch outs of sands and shales), depositional dips and gross permeability architecture.

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Abstract: Foraminiferal and Calcareous Nannofossil Biostratigraphy and Well-log Sequence Stratigraphic Analysis of Two Niger Delta Offshore Wells

AAPG Bulletin ◽

10.1306/00aa7d42-1730-11d7-8645000102c1865d ◽

1998 ◽

Vol 82 (1998) ◽

Author(s):

FADIYA, SUYI LAWRENCE

Keyword(s):

Niger Delta ◽

Well Log ◽

Calcareous Nannofossil ◽

Sequence Stratigraphic ◽

Stratigraphic Analysis ◽

Calcareous Nannofossil Biostratigraphy

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Insight into sequence stratigraphic and structural framework of the onshore Niger Delta Basin: Integrating well logs, biostratigraphy, and 3D seismic data

Arabian Journal of Geosciences ◽

10.1007/s12517-017-3070-5 ◽

2017 ◽

Vol 10 (14) ◽

Author(s):

Chidozie Izuchukwu Princeton Dim ◽

K. Mosto Onuoha

Keyword(s):

Seismic Data ◽

Niger Delta ◽

Well Logs ◽

3D Seismic ◽

Sequence Stratigraphic ◽

Structural Framework ◽

Niger Delta Basin ◽

3D Seismic Data ◽

Insight Into

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Sequence stratigraphic analysis and reservoir quality assessment of an onshore field, Central Swamp Depobelt, Niger Delta Basin, Nigeria

Arabian Journal of Geosciences ◽

10.1007/s12517-019-4954-3 ◽

2019 ◽

Vol 12 (24) ◽

Cited By ~ 1

Author(s):

Okwudiri Aloysius Anyiam ◽

Joseph Nanaoweikule Eradiri ◽

Ayonma Wilfred Mode ◽

Chukwudike Gabriel Okeugo ◽

Ikenna Christopher Okwara ◽

...

Keyword(s):

Quality Assessment ◽

Niger Delta ◽

Reservoir Quality ◽

Sequence Stratigraphic ◽

Stratigraphic Analysis ◽

Niger Delta Basin

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Sequence stratigraphic analysis and hydrocarbon prospectivity of AMO field, deep offshore Niger delta, Nigeria

Energy Geoscience ◽

10.1016/j.engeos.2021.11.003 ◽

2021 ◽

Author(s):

Adeniyi Amodu ◽

Oluwaseye Peter Oyetade ◽

Suyi Lawrence Fadiya ◽

Oluwabamiwa Fowora

Keyword(s):

Niger Delta ◽

Sequence Stratigraphic ◽

Stratigraphic Analysis

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Sequence Stratigraphic Interpretation of FX-1 and FX-2 wells, Onshore Western Niger Delta, Nigeria

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v24i2.17 ◽

2020 ◽

Vol 24 (2) ◽

pp. 303-311

Author(s):

F.O. Amiewalan ◽

F.A. Lucas

Keyword(s):

Sequence Stratigraphy ◽

Niger Delta ◽

Gamma Ray ◽

Computer Software ◽

Well Logs ◽

Data Simulation ◽

Candidate Sequence ◽

Depositional Sequences ◽

Sequence Stratigraphic ◽

Sequence Boundaries

The area of study is a portion of the Greater Ughelli Depobelt in Niger Delta Basin. The main aim of the paper is to interpret the sequence stratigraphy of FX-1 and FX-2 wells by employing data sets from biostratigraphic data and well logs. Standard laboratory techniques were used for data treatment while computer software such as Petrel and StrataBugs were used for data simulation, processing, integration and interpretation. Sedimentology, interpreted gamma ray and resistivity well logs integrated with biostratigraphic data were utilized to define the candidate maximum flooding surfaces and sequence boundaries. The wells have the following distributions of sequences: FX-1 well have five depositional sequences with eight candidate maximum flooding surfaces at depths 10011 ft., 9509 ft., 9437 ft., 6362 ft., 5752 ft., 5507 ft., 5161 ft. and 4816 ft. dated 34.0 Ma, 33.0 Ma, 31.3 Ma, 28.1 Ma, 26.2 Ma, 24.3 Ma, 23.2 Ma and 22.0 Ma and seven candidate sequence boundaries at 9616 ft., 6656 ft., 6116 ft., 5639 ft., 5424 ft., 4859 ft. and 4581 ft. dated 33.3 Ma, 29.3 Ma, 27.3 Ma, 24.9 Ma, 23.7 Ma, 22.2 Ma and 21.8 Ma, respectively. FX-2 well have four depositional sequences, five candidate MFSs were identified at 7764 ft., 7196 ft., 6721 ft., 5862 ft. and 5571 ft. dated 34.0 Ma, 33.0 Ma, 31.3 Ma, 28.1 Ma and 24.3 Ma and five candidate SBs at 6941 ft., 6029 ft., 5688 ft., 5653 ft. and 5542 ft. dated 32.4 Ma, 29.3 Ma, 27.3 Ma, 24.9 Ma and 23.7 Ma respectively. The correlation of the two wells and sequence stratigraphic interpretation is a supplementary understanding of the subsurface geology of the Onshore, western Niger Delta area of Nigeria. Keywords: Bio-stratigraphic data, Well logs, Sequence stratigraphy, Well correlation.

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Delineating Depositional Environment through Lithostratigraphy and 2D Sequence Stratigraphy of a Typical Ramp Succession: In the Obom Field Niger Delta

10.2118/207171-ms ◽

2021 ◽

Author(s):

Onome Okobiebi ◽

Becky Okobiebi

Keyword(s):

Sequence Stratigraphy ◽

Niger Delta ◽

Depositional Environment ◽

Facies Analysis ◽

Seismic Analysis ◽

3D Modelling ◽

Sequence Stratigraphic ◽

Stratigraphic Analysis ◽

Depositional Patterns ◽

Stacking Patterns

Abstract Modelling the most appropriate depositional environment is essential in the reservoir characterisation and 3D modelling of oil bearing sands and the integration of various workflows reduces the uncertainty in deciding the appropriate depositional model which serves as a precursor into petrophysical property distribution during 3D modelling. This paper elaborates a robust study of the integration facies analysis, 2D sequence Stratigraphy and biostratigraphy data in depicting the environment of deposition of the OBOM field. The lithological description of the G8 to the F5 reservoirs ranged from finning upward sequence and blocky shaped sequence as channel sands and coursing upward shoreface deposits. Mineralogical descriptions of the penetrated sands were also carried out, especially on the F5 reservoir in which the presence of radioactive minerals was decisive to constrain the depositional environment to lower shoreface. In the Sequence stratigraphic analysis two 3rd Order depositional cycles was identified from top to bottom in the field. This is substantiated by the facies trend, facies cross plot and cycles indicators like maximum flooding surfaces identified by regional marker shales, biofacies population and biodiversity charts and sequence stratigraphic methods like sequence thickness, bed stacking patterns and facies depositional patterns with regards sea level change. It was noticed that reservoir thickness reduces from the bottom to the top with the proximal channel sands in deep intervals gradually overlain by distal upper shoreface sands and lower shoreface sands at the shallower intervals. The gross depositional environment was a transgressive marine settings ranging from the lower shoreface and channelized upper shoreface deposits. The results from the integration of facies analysis, biofacies, seismic analysis and sequence stratigraphy results reduces uncertainty in depositional environment models.

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