Evaluation of seismic attributes for reservoir characterization over Edi field, Niger delta, Nigeria using 3d seismic data

  • Authors

    • Nyeneime O. Etuk University of Uyo, Uyo, Akwa Ibom State, Nigeria
    • Mfoniso U. Aka Department of Physics and Astronomy, University of Nigeria, Nsukka,
    • Okechukwu A. Agbasi MIchael Okpara University of Agriculture, Umudike
    • Johnson C. Ibuot Department of Physics and Astronomy, University of Nigeria, Nsukka,
    2020-09-19
    https://doi.org/10.14419/ijag.v8i2.31043
  • Acoustic Impedance, Direct Hydrocarbon Indicator, Faults, Horizons, Time Slice.

  • Seismic attributes were evaluated over Edi field, offshore Western Niger Delta, Nigeria, via 3D seismic data. Manual mappings of the horizons and faults on the in-lines and cross-lines of the seismic sections were done. Various attributes were calculated and out put on four horizons corresponding to the well markers at different formations within the well were identified. The four horizons identified, which includes: H1, H2, H3 and H4 were mapped and interpreted across the field. The operational agenda was thru picking given faults segments on the in–line of seismic volume. A total of five faults coded as F1, F2, F3, F4 and F5, F1 and F5 were the major fault and were observed as extending through the field. Structural and horizon mappings were used to generate time structure maps. The maps showed the various positions and orientations of the faults. Different attributes which include: root mean square amplitude, instantaneous phase, gradient magnitude and chaos were run on the 3D seismic data. The amplitude and incline magnitude maps indicate direct hydrocarbon on the horizon maps; this is very important in the drilling of wells because it shows areas where hydrocarbons are present in the subsurface. The seismic attributes revealed information, which was not readily apparent in the raw seismic data.

     

     

     


  • References

    1. [1] Taner, M.T. Koehler, F. & Sheriff, R.E. (1979). Complex Seismic Trace Analysis. Geophysics 44 (6): 1041. https://doi.org/10.1190/1.1440994.

      [2] Babangida, W.J. Tim, J.R. & Graham, K.W. (2013). Application of volumetric seismic discontinuity attribute for fault detection: Case study using deep water Niger Delta 3D seismic data. The Leading Edge, 32: 424-428. https://doi.org/10.1190/tle32040424.1.

      [3] Taner, M.T. (2001). Seismic Attributes. Canadian Society of Exploration Geophysics Recorder. 26(9): 48-56.

      [4] Brown, A.R. (2004). Interpretation of three-dimensional seismic data. American Association of Petroleum Geologists Memoir. 42(9): 12-89.

      [5] Sheriff, R.E. (1980). Seismic Stratigraphy. International Human Resources Development Corporation (IHRDC), Boston, p.227 https://doi.org/10.1007/978-94-011-6395-8.

      [6] Chambers, R.L. & Yarus, J.M. (2002). Quantitative use of seismic attributes for reservoir characterization CSEG Recorder. 14-15.

      [7] Sheriff, R.E. (1991). Encyclopedic Dictionary of Exploration Geophysics. SEG.

      [8] Schlumberger, (2009). Geological significance of seismic attribute. http://www.glossary.oilfield.slb.com/displayimage.cfm/1D=22.

      [9] Pennington, W.D. (2001). Seismic Time-Lapse Surprise at Teal South: That Little Neighbor Reservoir Is Leaking! The Leading Edge 20 (10): 1172. https://doi.org/10.1190/1.1487249.

      [10] Obaje, S.O. (2013). Seismic interpretation of Tomboy Field, Offshore Western Niger Delta, Nigeria. International Journal of Science and Technology. 2(9): 648-660.

      [11] Damuth, J.E (1994). Neocene gravity tectonics and depositional processes on the deep Niger Delta continental’s margin. Marine and Petroleum Geology 11(3): 320- 345. https://doi.org/10.1016/0264-8172(94)90053-1.

      [12] Ajisafe, Y.C. & Ako, B.D. (2013). 3D seismic attributes for reservoir characterization of “Y†field, Niger Delta, Nigeria. Journal of Applied Geology and Geophysics. 1(2): 23-31. https://doi.org/10.9790/0990-0122331.

      [13] Evamy, B. Haremboure, J. & Kamerling, P. (1978). Hydrocarbon habit of tertiary Niger Delta. American Association of Petroleum Geologist Bulletin. 62: 1-29. https://doi.org/10.1306/C1EA47ED-16C9-11D7-8645000102C1865D.

      [14] Doust, H. & Omatsola, E. (1990). Niger Delta reference. Unpublished Shell Petroleum Company report 1: 201-237.

      [15] Etu-Efeotor, J.O. (1997). Fundamentals of Petroleum Geology. Paragraphics: Port-Harcourt, PH.

      [16] Whiteman, A.J. (1982). Nigeria: its Petroleum Geology, Resources and Potential. London, Graham and Trotman p. 394. https://doi.org/10.1007/978-94-009-7361-9.

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  • How to Cite

    O. Etuk, N., U. Aka, M., A. Agbasi, O., & C. Ibuot, J. (2020). Evaluation of seismic attributes for reservoir characterization over Edi field, Niger delta, Nigeria using 3d seismic data. International Journal of Advanced Geosciences, 8(2), 168-172. https://doi.org/10.14419/ijag.v8i2.31043