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  Subjects -> GEOGRAPHY (Total: 493 journals)
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International Journal of Advanced Geosciences
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2311-7044
Published by Science Publishing Corporation Homepage  [13 journals]
  • 3D seismic interpretation and prospect identification of the dembe field
           offshore, Niger delta, Nigeria

    • Authors: Nnaemeka C. C, Anakwuba E. K, Onwuagba F. C, Nechi V. O, Igwebudu C. N, Ezenwa E. E, Orabueze V. C, Nebechukwu F. O., Okafor A. C
      Pages: 1 - 11
      Abstract: 3D seismic interpretation and prospect evaluation has been carried out in a hydrocarbon bearing field, standard method of seismic interpretation which includes fault interpretation, well-seismic tie, and horizon mapping were carried out with the aid of seismic attributes such as variance edge and root mean square attributes. Well-seismic-tie established a reasonable tie and indicated that the identified reservoirs were of low impedance as the top of this reservoirs coincided with the troughs. TWT vs Depth plot showed a linear trend which aided in creating a velocity model for the time-depth conversion. Fault mapping revealed that the area was divided into 8 blocks by regionally extensive faults associated with several minor faults which are normal and listric in geometry. Petrophysical analysis showed that the reservoirs has an average porosity of 0.24, water saturation of 0.35, and net-to-gross of 0.78 which are favourable reservoir conditions. A lead Dembe-3, and 2 prospects Dembe-1 and Dembe-2 were identified. Volumetric estimation shows that the prospects boasts of a combined petroleum reserve of about 134 MMSTB of recoverable oil and about 167 BCF of recoverable gas. The results from this study show that, away from currently producing zones of the Dembe field, additional lead and prospects exist which could be further explored to optimize hydrocarbon production in the field.  
      PubDate: 2022-02-02
      DOI: 10.14419/ijag.v10i1.31884
      Issue No: Vol. 10, No. 1 (2022)
       
  • On the occurrence of Bérem dolerites dyke swarms (north east adamawa
           plateau, Cameroon)

    • Authors: Samira Ngougoure Mouansie, Oumarou Faarouk Nkouandou, Alaxendre Alambert Ganwa, Aminatou Fagny Mefire, Atouba Lise Carole, Adama Haman, Appolinaire Dinamou
      Pages: 12 - 18
      Abstract: Petrography and geochemical outline studied carried out on Bérem dolerites have shown that they crosscut the local granitoıds of the basement toward N100-120, EW and N160E directions. Individual dyke may have 5 m to 50 m wide and extend along strike on 200 m to 3 km. Microscopic observations have distinguished the lavas of doleritic textures of ophitic to sub ophitic types. ICP-AES and ICP-MS geochemical analyses of representative samples have distinguished the lavas of basaltic trachyandesite of normative quartz-hypersthene compositions. All lavas belong to the same lavas series of continental tholeiites affinity which have undergone the fluids circulation and crustal contamination processes. Mantle of Bérem dolerites should be E-MORB mantle component which have experienced the relatively high partial melting rate. Bérem dolerites should be considered as imprints of late Pan African relaxation phase which cracks should have been filled by dolerite lavas.
      PubDate: 2022-03-20
      DOI: 10.14419/ijag.v10i1.31937
      Issue No: Vol. 10, No. 1 (2022)
       
  • Petrography and geochemical framework of guébaké dolerites dyke swarms
           (north Cameroon, central Africa)

    • Authors: Abondou Togo, Nkouandou Oumarou Faarouk, Zangmo Tefogoum Ghislain, Fagny Mefire Aminatou, Daouda Dawai, Dinamou Appoliaire, Guihdama Dagwai Justin, Adama Haman
      Pages: 19 - 27
      Abstract: Dolerites dykes of 4.5 to 25 m wide extend from 200m to 1km, crosscut the Guébaké granitoids basement in northern Cameroon along EW to N100E directions. Petrographic studies reveal the microlitic porphyritic texture to classical doleritic texture of ophitic to sub-ophitic types. Guébaké dolerites are mainly composed in various proportions of skeletal plagioclase and feldspar, clinopyxene, amphibole and oxides crystals. ICP-MS and ICP-AES geochemical analyses have distiguished a lava series composed of trachybasalts, basaltic trachyandesites, trachyandesites, trachytes and rhyolites of continentale tholeiites affinity. Lavas have been differenciated trough fractional crystallization process coupled with crustal contamination and metasomatism. Guébaké dolerites are products of relatively high partial melting rate of E-MORB mantle component. They stand as fingerprints of the post pan African crustal consolidation and precursor of the development of central African rift system at Cretaceous times.  
      PubDate: 2022-04-05
      DOI: 10.14419/ijag.v10i1.31939
      Issue No: Vol. 10, No. 1 (2022)
       
  • Reservoir characterization using integrated seismic attributes and
           petrophysical parameters in an onshore field of Niger delta basin

    • Authors: ADEKUNLE SOFOLABO, ALEXANDER NWAKANMA
      Pages: 28 - 40
      Abstract: An integrated approach of reservoir characterization of a field was performed using seismic attributes and petrophysical parameters for the evaluation of subsurface geological features and hydrocarbon potential of an onshore field in Niger Delta Basin. Four reservoir intervals were identified within the field wells based on their position within the stratigraphic column, and the reservoir correlation, which was aided using the principle of uniform horizontality, based on the simple rule that sediments are deposited horizontally and basic understanding of sequence stratigraphy. The study revealed that, the four reservoirs were predominantly sand units intercalated with shale within the reservoir units. The petrophysical evaluation revealed the Net to Gross (NTG) values ranges from 79% to 87% within the reservoir units, while the effective porosity ranges from 17% to 21%, the permeability ranges between 1307mD to 1678mD across the reservoir units, while the water saturation ranges from the lowest of 35% (Reservoir C) to 78% in reservoir D. A total of fifteen faults were interpreted using the seismic data, while the surface maps (Time and depth surface maps) revealed the identified closures which are anticlinal structures that are fault dependent. The characterization of the reservoir was further enhanced using the seismic attributes (structural and stratigraphic) extracted such as Reflection intensity, Sweetness, Variance, Envelope, Instantaneous frequency, Time gain, Trace AGC, Local structural dip, Gradient magnitude and RMS amplitude. The results shows moderate to high sweetness (sweet spots) within the zone of interest, while the Envelope attribute show acoustic impedance contrasts indicating discontinuities, lithology changes and possible present of hydrocarbon (Bright spots). The variances and gradient magnitude enhanced the signal to map out discontinuities caused by faults and fractures which are signature that enabled delineation of the zone. The integrated approach validates the lithology discrimination of the elastic properties from the well logs and its effectiveness in optimizing and proper understanding of the subsurface, thus identifying and unmasking hidden features within the reservoir (probable bypass) in the field. The study has revealed that the integration of seismic attributes with petrophysical parameters is a better characterization method for fluid and lithology discrimination of a field in any given reservoir study.
      PubDate: 2022-11-26
      Issue No: Vol. 10, No. 1 (2022)
       
  • Comparative analysis of the profitability of the tossa and kenaf seed
           cultivation at contact growers’ level in selected areas of Bangladesh

    • Authors: MD. Babul Hossain, Bishwajit Kundu
      Pages: 41 - 45
      Abstract: This study compared the profitability of tossa and kenaf seed cultivation based on the 2021 seed-growing season in two locations: Rangpur and Jashore using the tossa variety BJRI Tossa Pat 8 and Rangpur and Kishoreganj using the kenaf variety HC-95. Data analysis methods included descriptive statistics, break-even analysis and cost-benefit analysis. The expensive factors in growing tossa and kenaf seeds were labor costs, followed by land use, machinery, fertilizers, and seed. While the cost of labor (58.38%) and fertilizers (8.74%) were higher for tossa seed, the cost of seed (4.85%) for kenaf seed cultivation was higher as a percentage of the total cost. The highest tossa and kenaf seed yields were 722 kgha-1 and 798 kgha-1, respectively, in Jashore and Kishoreganj. Average break-even price for kenaf seed was Tk. 130 kg-1, which was less expensive than tossa seed (Tk. 181 kg-1). When compared to kenaf (341 kgha-1), average break-even quantity of tossa seed was higher (679 kgha-1). The average benefit cost ratio was found higher in the kenaf seed crop, as compared to the tossa seed crop in respect of total cost, variable cost, and cash cost. According to this finding, growing kenaf as seed crop can be profitable for farmers.
      PubDate: 2022-11-30
      Issue No: Vol. 10, No. 1 (2022)
       
 
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