Sequence Stratigraphic, Structural and Reservoir Analyses: An Integrated Approach to Exploration and Development of the Eastern Coastal Swamp Cluster, Niger Delta Basin

2016 ◽  
Author(s):  
C. I. Dim ◽  
K. Mosto Onuoha ◽  
C. Gabriel Okeugo
Keyword(s):  
Niger Delta ◽  
Evaluation Studies ◽  
Hanging Wall ◽  
Hydrocarbon Exploration ◽  
Foot Wall ◽  
Stratigraphic Correlation ◽  
Sequence Stratigraphic ◽  
Hydrocarbon Reservoir ◽  
Niger Delta Basin ◽  
System Tract

ABSTRACT Sequence stratigraphic, structural and reservoir analytical tools have been employed in interpreting the geology of the eastern Coastal Swamp Depo-belt of the Niger Delta Basin. The aim was to understand the stratigraphic framework, structural styles and hydrocarbon reservoir distribution for improved regional hydrocarbon exploration across the onshore Niger Delta basin. This interpretative study made use of well logs, biostratigraphic (biofacies and bio-zonation) and petrophysical data obtained from twenty wellbores, integrated with recently merged and reprocessed 3D Pre-Stack Time Migrated regional seismic volume spanning across eight fields (over 960 km2). Results reveal the occurrence of nine key chronostratigraphic surfaces (five maximum flooding surfaces and four sequence boundaries) that were tied to well-established pollen and foram bio-zones for high resolution sequence stratigraphic interpretation. The sediment stacking patterns recognized from gamma ray log signatures were used in delineating the lowstand system tract (LST), transgressive system tract (TST) and highstand system tract (HST) genetic units. Well log sequence stratigraphic correlation reveals that stratal packages within the area were segmented into three depositional sequences occurring from middle to late Miocene age. Furthermore, there is thickening of stratal packages with corresponding decrease in net-to-gross thickness from north to south (basinwards). This is due possibly to the influence of syn-depositional structures on stratigraphy. The combination of reservoir sands (of LST and HST), source and seal shales (of TST and HST) and fault structures allows for good hydrocarbon accumulation and should be targeted during exploration. Reservoir evaluation studies using petrophysical parameters indicates the presence of good quality reservoir intervals, which are laterally continuous and partly compartmentalized. Structural top maps of reservoirs show good amplitude response that are stratigraphically and structurally controlled. Structural analysis revealed the occurrence of back-to-back faulting, collapsed crest structures, simple/faulted rollovers, regional foot wall and hanging wall closures and sub-detachment structures. These structural styles constitute the major hydrocarbon entrapment mechanism in the area. Overall, the study has unraveled the existence of undrilled hydrocarbon leads at deeper depths that should be further revalidated for development and production.

scholarly journals Sequence stratigraphic approach to hydrocarbon exploration: a case study of Chiadu field at eastern onshore Niger Delta Basin, Nigeria

2017 ◽  
Vol 8 (2) ◽  
pp. 399-415
Author(s):  
Victor C. Nwaezeapu ◽  
Anthony U. Okoro ◽  
Elesius O. Akpunonu ◽  
Norbert E. Ajaegwu ◽  
Kingsley C. Ezenwaka ◽  
...  
Keyword(s):  
Niger Delta ◽  
Hydrocarbon Exploration ◽  
Sequence Stratigraphic ◽  
Niger Delta Basin

scholarly journals Application of 3D Seismic Attribute Analyses for Hydrocarbon Prospectivity in Uzot-Field, Onshore Niger Delta Basin, Nigeria

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
U. C. Omoja ◽  
T. N. Obiekezie
Keyword(s):  
Niger Delta ◽  
Hanging Wall ◽  
Average Energy ◽  
Maximum Amplitude ◽  
Seismic Attributes ◽  
Bright Spot ◽  
Maximum Magnitude ◽  
3D Seismic ◽  
Amplitude Maximum ◽  
Niger Delta Basin

3D seismic interpretative study was carried out across the Uzot-field in the western Coastal Swamp Depobelt of the onshore Niger Delta Basin, Nigeria, with the aim to identify possible hydrocarbon leads and prospects away from the drilled zone, utilizing seismic amplitude attributes. The method employed in this study involved systematic picking of faults and mapping of horizons/reservoir tops across seismic volume and extraction of seismic attributes. Structural analysis indicates the presence of down-to-basin footwall and hanging wall faults associated with rollover anticlines and horst-block (back-to-back fault). Generated time and depth structural maps from three reservoir intervals (D3100, D5000, and D9000) revealed the presence of fault dependent closure across the field. Analyses of relevant seismic attributes such as root-mean-square (RMS) amplitude, maximum amplitude, average energy amplitude, average magnitude amplitude, maximum magnitude attribute, and standard deviation amplitude, which were applied on reservoir tops, revealed sections with bright spot anomalies. These amplitude anomalies served as direct hydrocarbon indicators (DHIs), unravelling the presence and possible hydrocarbon prospective zones. In addition, structural top maps show that booming amplitude is seen within the vicinity of fault closures, an indication that these hydrocarbon prospects are structurally controlled. Results from this study have shown that, away from currently producing zone at the central part of the field, additional leads and prospects exist, which could be further evaluated for hydrocarbon production.

Well Logging Analysis in Niger Delta Basin

2021 ◽  
Author(s):  
Aniekeme Edet Sunday
Keyword(s):  
Niger Delta ◽  
Oil And Gas ◽  
Well Logging ◽  
Hydrocarbon Exploration ◽  
Seismic Survey ◽  
Monitoring And Control ◽  
Principal Characteristics ◽  
Formation Evaluation ◽  
Niger Delta Basin ◽  
Mud Logging

Abstract A hydrocarbon exploration begins with the geological recognition of probable hydrocarbon accumulation areas, which are confirmed by seismic survey and, to ensure certainty, it is necessary to drill a well. On those exploration wells measurements are made down the hole for the formation evaluation. The evaluation of water, oil and gas saturations are attained by geological and petrophysical characteristics. To obtain such information it is necessary to use a combination of several sources, namely mud logging, coring, well logging and occasionally down the hole tests. Due to the high risks associated with drilling activities, such as safety problems and environmental impacts, it is extremely important to have a very well designed and established drilling program. Therefore, the activities monitoring and control and a good knowledge of what types of formations will be affected, and its principal characteristics, are priorities to take into consideration. Bearing in mind the sources for the formation evaluation, the present work aims to focus on wireline logs and the major challenge that is faced here which is data acquisition and petrophysical evaluation. The case study is a Niger Delta basin (Nigeria).

Characterizing the Middle–Upper Miocene Reservoir Intervals of a Producing Field in the Niger Delta Basin: An Application of Facies, Sequence Stratigraphic and Petrophysical Analyses

2018 ◽  
Vol 44 (1) ◽  
pp. 429-448
Author(s):  
Chidozie Izuchukwu Princeton Dim ◽  
K. Mosto Onuoha ◽  
Ayonma Wilfred Mode ◽  
Ikenna Christopher Okwara ◽  
Chukwudike Gabriel Okeugo
Keyword(s):  
Niger Delta ◽  
Sequence Stratigraphic ◽  
Upper Miocene ◽  
Niger Delta Basin

BIOSTRATIGRAPHY AND SEQUENCE STRATIGRAPHY OF THE DEEP OFFSHORE NIGER DELTA AND IMPLICATIONS FOR FUTURE HYDROCARBON EXPLORATION IN THE PALAEOGENE SEQUENCES

2021 ◽  
pp. 1-49
Author(s):  
Bertram Maduka Ozumba ◽  
Chidozie Izuchukwu Princeton Dim
Keyword(s):  
Niger Delta ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Sequence Stratigraphic ◽  
Exploration And Production ◽  
Modeling Prediction ◽  
Well Correlation ◽  
Rock Characterization ◽  
Hydrocarbon Exploration And Production ◽  
Work Done

The Niger Delta Deep Offshore Basin has been the latest frontier within the Niger Delta for hydrocarbon exploration and production activities. Until the onset of drilling activities in the early nineteen nineties, little was known about the biostratigraphy of this frontier setting. Thus, uncertainties existed in the ages ascribed to the various stratigraphic sequences. Presently, several wells have been drilled in the Deep Offshore Niger Delta and a three-pronged biostratigraphic data and some sequence stratigraphic interpretations have become available. We integrated biostratigraphic data comprising palynological, foraminiferal, and calcareous nannoplankton zonation and biofacies, wireline log information and regional-3D seismic data, with simple basic sequence stratigraphic analysis for a detailed well correlation, regional mapping of hydrocarbon-bearing intervals, and evaluation of the thicknesses of promising stratigraphic intervals. Results show a significant effect on not only the earlier conceptualized age of the deepest prospective reservoirs, but also the ages of possible source rocks in the Paleogene of the Niger Delta Offshore sequence. This finding will help in the realistic assumptions of source rock characterization, charge modeling/prediction, and the stratigraphic thicknesses of the offshore sequences and their reservoirs. This paper examines the specific derivable age interpretations from the integration of at least six wells, biostratigraphic data with seismic and the implications of these interpretations for hydrocarbon prospectivity of the Paleogene sequences. Furthermore, this paper documents the biostratigraphy work done in the area, in all the structural belts where drilling has occurred including the deepest well drilled in the Deep Offshore Niger Delta, Bosi-006. The results of this study have a critical impact on the current regional geological understanding of the Deep Offshore Niger Delta.

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