Shale volume and porosity delineation of coast swamp depobelt in Niger delta region, Nigeria, using well log

  • Abstract
  • Keywords
  • References
  • PDF
  • Abstract

    Well log data from two wells were evaluated for shale volume, total and effective porosity. Well log data were obtained from gamma ray, neutron-density log, resistivity, sonic and caliper log respectively. This study aimed at evaluating the effect of shale volume, total and effective porosity form two well log data. The results of the analysis depict the presence of sand, sand-shale and shale formations. Hydrocarbon accumulation were found to be high in sand, fair in sand-shale and low in shale, since existence of shale reduces total and effective porosity and water saturation of the reservoir. The thickness of the reservoir ranged from 66 – 248.5ft. The average values of volume of shale, total and effective porosity values ranged from 0.004 – 0.299dec, 0.178 – 0.207dec and 0.154 – 0.194dec. Similarly, the water saturation and permeability ranged from 0.277 – 0.447dec and 36.637 - 7808.519md respectively. These values of total and effective porosity are high in sand, fair in sand-shale and low in shale formations. The results for this study demonstrate: accuracy, applicability of these approaches and enhance the proper evaluation of petrophysical parameters from well log data.





  • Keywords

    Shale Volume; Effective Porosity; Petrophysical Parameter; Total Porosity; Saturation Exponent.

  • References

      [1] Ameloko, A.A. and Owoseni, A.M. (2015). Hydrocarbon Reservoir Evaluation of X-Field, Niger Delta using Seismic and Petrophysical Data. International Journal of Innovation and Scientific Research, 15(1): 193-201.

      [2] Aneej (2004). Oil of Poverty in the Niger Delta. A publication of the African Network for Environment and Economic Justice, 4(2): 53-59.

      [3] Archie,G.E.(1952). Classification of Carbonate Reservoir Rocks and Petrophysical consideration. American Association of Petroleum Geologist, Bulletin, 4(2):10-18.

      [4] Asquith, G and Gibson. (1982). Basic Well Log Analysis for Geologists. American Association of Petroleum Geologist. Methods for Exploration Series, 2(3), 12-18.

      [5] Avbovbo, A. A. (1978). Tertiary Lithostratigraphy of Niger Delta: American Association of Petroluem Geologists Bulletin, 62: 295-300.

      [6] Chapman, R.E. (1983): The logging of Boreholes. Petroleum Geology, Concise Study, Elsevier, Ameterdium 107-157.

      [7] Chopra, S and Mechelena, R. J. (2011) Introduction to this Special Section: Reservoir Characterisation: The Leading Edge 30 No.1,35.

      [8] Egbai, J.C and Aigbogun, C.O. (2012). Seismic Refraction Profiling and Vertical Electrical Sounding for Ground Water Study in Obiaruku, Delta State, Nigeria. IJRAS, 10(2): 12-17

      [9] Evamy, B.D, Harembource .J. and Kamerly, P. (1978). Hydrocarbon Habit of Tertiary Niger Delta. American Association of Petroleum Geologist. Bulletin, 6(2): 1-29.

      [10] FME: Federal Ministry of Environment (2006). Niger Delta Natural Resourses Damage Assessment and Restoration Project, Phase 1 Scoping Report (Abuja: Federal Ministry of Environment, 2006), 5(2): 10-15.

      [11] Hopers, J. (1965). Gravity Field and the Structure of the Niger Delta Nigeria. Geologist Society of American Bulletin, 7(6): 407-422.[407:GFASOT]2.0.CO;2.

      [12] Kaplan,A ., Lusser, C.U. & Norton, I.O.(1994). Tectonic Map of the World, Panel 10: Tulsa, American Association of Petroleum Geologists, Scale1: 10,000,000

      [13] Klett, T. R., Ahlbrandt, T. S., Schmoker, J. W. & Dolton, J. L. (1997). Ranking of the World’s Oil and Gas Provinces by known Petroluem Volumes: United State. Geological Survey Open File Report.97–463.

      [14] Nyantakyi, E. K., Wangshui, H. U., Korkole, J. K., Qin, G. and Han, M. C., (2013). Structural and Strategic Mapping of Delta Field, Agbada Formation, Offshore Niger Delta, Nigeria. American Journal of Engineering Research (AJER) 11/2013, 2(11): 204-215.

      [15] Okwoli, E., Obiora, D.N, Adewoye, O., Chukudebelu, Ezema, P.O. (2015). Reservoir Characterization and Volumetric Analysis of Lona Field Niger, Delta using 3D Seismic and Well Log Data. Petroleum and Coal, 57(2): 108–119.

      [16] Okwueze, E. E., (2010) Geophysics in the Service of Mankind: 47th Inaugural Lecture University of Calabar. P.7.

      [17] Kulkie,H. (1995). Nigeria, In Kulke, H., (Ed)., Regional Petroluem Geology of the World.Part 11: Africa, America, Australia and Antarctica: Berlin: Gebruder Borntraeger, 143-172.

      [18] Stacher,P. (1995). Present Understanding of the Niger Delta Hydrocarbon Habitat, In Oti, M.N., & Postma, G., (Ed)., Geology of Deltas. Roterdam: A. A. Balkema, 257-267.

      [19] Weber, K.J and Daukoru, E.M. (1985). Petroleum Geology of the Niger Delta (9th World) Petroleum Congress Proceeding: Tokyo, Japan, 6(2): 209-221.

      [20] Welex, (1978). An Introduction to Well Log Analysis: Houston, Texas, 46.

      [21] Whiteman, I.K. (1982): Fundamental of Reservoir Engineering,4th ed. Norman, University of Oklahoma.426.




Article ID: 29772
DOI: 10.14419/ijag.v7i2.29772

Copyright © 2012-2015 Science Publishing Corporation Inc. All rights reserved.