scholarly journals Interpretation of Depositional Environment of Rho Field Using Sequence Stratigraphic Analysis, Shallow Offshore Depobelt, Niger Delta

2020 ◽  
pp. 93-103
Author(s):  
Okoli Emeka Austin ◽  
Acra Jones Edward ◽  
Ehirim Chukwuemeka Ngozi
Keyword(s):  
Niger Delta ◽  
Depositional Environment ◽  
High Energy ◽  
Delta Front ◽  
Fluvial Systems ◽  
Sequence Stratigraphic ◽  
Stratigraphic Analysis ◽  
Correct Orientation ◽  
Stacking Pattern ◽  
Input Reconstruction

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.

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

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.

scholarly journals Sequence Stratigraphic Modeling of the Lower Thamama Group, East Onshore Abu Dhabi, United Arab Emirates

GeoArabia ◽  
1997 ◽  
Vol 2 (2) ◽  
pp. 179-202 ◽  
Author(s):  
Sabah K. Aziz ◽  
Mohamed M. Abd El-Sattar
Keyword(s):  
United Arab Emirates ◽  
Seismic Data ◽  
Depositional Environment ◽  
High Energy ◽  
Source Rocks ◽  
Abu Dhabi ◽  
Sequence Stratigraphic ◽  
Reservoir Development ◽  
Energy Environment ◽  
Exploration Activity

ABSTRACT The Lower Cretaceous (Berriasian to Valanginian) Habshan Formation (Lower Thamama Group) of Abu Dhabi was deposited on a broad carbonate shelf. In east onshore Abu Dhabi, the Habshan Formation consists mainly of limestone and dolomite reaching a thickness of more than 1,100 feet. The depositional environment ranged from shallow-water peritidal to deeper shelf basin. The integration of seismic-stratigraphic, biostratigraphic, lithostratigraphic and electric log data reveals three sequences (I to III) and three shelf edges within the Habshan Formation in east onshore Abu Dhabi. These high energy shelfal sediments prograde toward the basin to the east and northeast with their shelf edges trending north-northwest to south-southeast. The seismic data indicates that the basin was filled in the east during the Hauterivian, after the deposition of Sequence IV (equivalent to the Zakum formation). Good reservoir development is found in the carbonates deposited in the high energy environment along the shelf edge of the Habshan sequence, particularly within the oblique and sigmoidal clinoforms, whereas potential source rocks are expected to be developed basinward. This combination renders the Habshan and Zakum sequences an attractive exploration target, both as structural and stratigraphic traps. Recent exploration activity in the area established the presence of hydrocarbons within the Habshan Sequence III in east onshore Abu Dhabi.

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

2019 ◽  
Vol 12 (24) ◽  
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

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

2021 ◽  
Author(s):  
Adeniyi Amodu ◽  
Oluwaseye Peter Oyetade ◽  
Suyi Lawrence Fadiya ◽  
Oluwabamiwa Fowora
Keyword(s):  
Niger Delta ◽  
Sequence Stratigraphic ◽  
Stratigraphic Analysis

scholarly journals Depositional model and sequential evolution of the upper Quintuco Formation in its type area: implications for paleogeographic reconstructions for the southern Neuquén Basin during the Valanginian

2016 ◽  
Vol 43 (2) ◽  
pp. 215 ◽  
Author(s):  
Mariana S. Olivo ◽  
Ernesto Schwarz ◽  
Gonzalo D. Veiga
Keyword(s):  
Source Area ◽  
Evolutionary Stage ◽  
Delta Front ◽  
Sequence Stratigraphic ◽  
Architectural Analysis ◽  
Delta Plain ◽  
Stratigraphic Analysis ◽  
Facies Associations ◽  
Neuquen Basin ◽  
Neuquén Basin

The Quintuco Formation (Berriasian-early Valanginian) in central Neuquén province comprise marine, transitional and continental deposits. These deposits were included in several regional stratigraphic studies since the 80’s but receiving little attention in terms of detailed facies analysis, palaeoenvironmental reconstructions and evolution. Understanding the evolutionary stage corresponding to cusp section of the Quintuco Formation and its relation with basal deposits of the Mulichinco Formation, is key to estimate the magnitude of associated change to the event of basin reconfiguration occurred in the early later Valanginian. In order to reconstruct the final stages of the evolution of the Quintuco Formation in its type locality (Sierra de la Vaca Muerta), a facial, architectural and sequence-stratigraphic analysis of the uppermost interval is presented. The study comprise the sedimentological description and interpretation of facies, combined with architectural analysis of key intervals. This allowed the identification of 7 facies associations, which represent the accumulation in prodelta (FA 1), delta front (FA 2 and FA 3), distal delta plain (FA 4 y FA 5) and proximal delta plain (FA 6 and FA 7). Subsequently, the spatial distribution of the different facies associations were analyzed and key surfaces related to significant changes in the depositional settings were identified across the investigated region. In this context, sequence-stratigraphic analysis of the studied interval was addressed and stacking patterns of the successions and vertical evolution of the interval are discussed. The upper interval of the Quintuco Formation represents the development of a deltaic system, where fluvial processes were dominant, but waves affected the off-axis parts of the system. The proximal areas were located towards the southwest with prodelta settings located toward the east. The delta system was built by successive shallowing-upward successions (15-40 m), bounded by regional transgressive surfaces, and with a long-term progradational staking. The reconstructed paleogeography for the last evolutionary stage of the Quintuco Formation suggest a well-established source area from the west-southwest, that would represent a new insight for paleogeographic settings for the southern Neuquén Basin during the Valanginian.

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