scholarly journals Shoreline Changes Using Seabed Bathymetric, Sediments Scan and Profiles Observations in “Zarum” Gas Field Offshore Niger Delta

2019 ◽  
Vol 2 (4) ◽  
Keyword(s):  
Niger Delta ◽  
Outer Shelf ◽  
High Fidelity ◽  
Marine Geology ◽  
Gas Field ◽  
Sediment Distribution ◽  
Shore Line ◽  
Astronomical Tide ◽  
Seabed Bathymetry ◽  
Jack Up

Seabed bathymetry, sediment scan and profiles are relevant geological and hydrographic observations widely used in marine geology to predict shore line changes as it concerns offshore fields development in the Niger Delta. Reliefs and heterogeneous sediment distribution, both across the seabed surface and in the shallow seabed profiles below, were examined. This study of the “Zarum gas Field” in the outer shelf environment offshore eastern Niger-Delta was from the results of measurements using high fidelity onboard instrumentation: Edgetech 4600 Multibeam and Sidescan, and Edgetech Sub Bottom Profiler. These instruments were side mounted on MV Cosco and towed along survey grids, within the designed corridor with the survey speed of 3knots.Seabed features were interpreted based on the acoustic sound reflectivity and refractions. The bathymetric values were reduced to the lowest astronomical tide, LAT of Opobo River entrance and range from 20.20m-25.89m with a deepening trend from the northwest to southeast caused by seabed current regimes and storm processes affecting the shoreline zones. The sediments of the scan vary from sand, through silt to clay which are of arenitic origin. Weak seismostratigraphic layer of 30m thick was observed below the seabed, which is presently undergoing secondary lithification. The study also shows existence of depressions and sediment fill in them called spud cans which vary between 10m-40m in diameter and debris, associated with previous rig movements; jack up barges and their drags. Observed are some subsea facilities pipelines and jackets. Based on findings, recommendations have been formulated for development of this gas Field.

Specific models for estimation of locally oriented laboratory thermal conductivity of tertiary sediments in the Niger Delta using wire line logs

2012 ◽  
Vol 4 (3) ◽  
Author(s):  
Akpabio Thompson ◽  
George Jimmy ◽  
Udofia Michael
Keyword(s):  
Thermal Conductivity ◽  
Niger Delta ◽  
Empirical Models ◽  
High Fidelity ◽  
Conductivity Data ◽  
Formation Factor ◽  
Model Based ◽  
Thermal Conductivity Data ◽  
Bed Thickness ◽  
Cementation Factor

AbstractIn this study, specific development of empirical models for estimation of laboratory thermal conductivities from wire line log thermal conductivity within the ambience of locally oriented wells located in the Niger Delta have been established. The laboratory thermal conductivity is characterised with high fidelity compared to wire line log thermal conductivity whose values vary as the dependence of lithology of the subsurface geomaterials, well effects, as well as the effects of the limited bed thickness of the adjacent lithological units of the Niger Delta where the study was stationed. The generalised equation kleff = 0.709 kweff + 0.188 is an empirically estimated model based on site variables (porosity, permeability and temperature) and constants (cementation factor, formation factor and tortuosity) of the locally oriented wells in the Niger Delta. It can be used to set bounds on the unstable wire line log thermal conductivity values within the 1-2.5 km depths where the oil-rich geomaterials in the Niger Delta are usually found. Equations have been established which show inter-convertibility between laboratory and wire line log thermal conductivity. These equations are considered useful in converting the available wire line log thermal conductivity data of nearby wells in the area to the usually desired and stable laboratory thermal conductivity. Various diagrams in 2-D and 3-D have been established to show the distribution of the parameters considered, and this could help the operating companies in the zone to predict the density of oil.

scholarly journals Foraminiferal analysis and paleoenvironments of sediments in well -Aa, deepwater offshore, Niger Delta, Nigeria

2020 ◽  
Vol 26 (1) ◽  
pp. 9-14
Author(s):  
Umoh Ekaete Enamekere ◽  
Fasina Peace Oluwaseyi
Keyword(s):  
Deep Water ◽  
Late Miocene ◽  
Benthic Foraminifera ◽  
Niger Delta ◽  
Planktonic Foraminifera ◽  
Older Age ◽  
Outer Shelf ◽  
Depth Interval ◽  
Entire Interval ◽  
Agglutinated Foraminifera

Foraminiferal analysis was carried out on twenty five (25) ditch cutting samples from well -AA, offsore Niger Delta covering a depth interval of 9000ft-11025f. The study was aimed at age deduction, zoning the well, and interpreting the paleoenvironment of deposition. Lithostratigraphic description carried out on the sample revealed that the bulk lithofacies constitute shale with streaks of sand (fine-medium) between 9170ft - 9210ft and 9360ft -9380ft. The entire analysed interval was barren of planktonic foraminifera while depth 9960ft revealed a spot occurrence of Lagena spp,representing the only calcareous benthic foraminifera recovered in the entire interval. Few to common occurrences of deepwater agglutinated foraminifera were found in the well, dominated by some species of Haplophragmoides spp and Haplophragmoides narivaensis. Other foraminifera with rare and scattered occurrence includes, Cribrostomides spp, Bathysiphon spp, Troahammina spp, Cyclammina spp, Cyclammina cancellata, Valvulina spp, and Glomospira spp. The only microfaunal associated accessory recovered is ostracod at depth 1080ft. The analysed intervals was assigned a Middle – Late Miocene (N17 and older age) based on the FDO of Haplophragmoides narivaensis. The  environment of deposition is based on the distribution of typical deep water arenaeceous foraminifera species recovered in the study. The predominance of the arenaeceous forms over calcareous forms suggest outer shelf environment of deposition. Keywords: Foraminifera, Palaeoenvironment, Niger delta, Biostratigraphy.

Identification and Cost Effective Mitigation of Calcium Carbonate Scaling in Gas Field - A Typical Case Study in Niger Delta

2017 ◽  
Author(s):  
Nnamdi L. Abuah ◽  
Daodu Olugbenga ◽  
Sedqwick M. Adam ◽  
Leo Chiejina ◽  
Taiwo Bamidele ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Niger Delta ◽  
Cost Effective ◽  
Typical Case ◽  
Gas Field
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