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Formation evaluation of reservoirs in Eocene, Niger Delta Nigeria using modified formation factor from Pickett’s plot

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Abstract

Formation factor evaluation was carried out across eight reservoirs in five wells in a field in the Niger Delta region of Nigeria. Formation factor is very vital in assessment of petrophysical parameters, it is important to use in-situ wireline logs to evaluate the petrophysical constants. The identified reservoir in the study area show good accumulation of hydrocarbon having net pay zone between 5.00 and 83.50 ft and density porosity between 0.17 and 0.35. In-situ log was used to evaluate porosity exponent with the help of Pickett’s plot, the porosity exponent values are between 1.65 and 2.52 in the study area. These values of porosity exponent are seen to be influence by the values of volume of shale, this indicates that the porosity exponent is affected by grain size, pore space and pore geometry. A modified formation factor equation from the Archie’s equation using porosity exponent from Pickett’s plot was used for formation evaluation of each of the wells. Most of the wells showed an over estimation (between 2.06 and 2.52) of porosity exponent expect for well BS02 (1.65) that indicates under estimation of the porosity exponent. The over estimation of formation factor as compared to Archie’s equation is between 8.89% (BS01 R1) and 48.88% (BN01 R2), while for under estimation of formation factor as observed in well BS02 is between 39.02 (BS02 R1) and 41.29% (BS02 R2). The study has been able to propose an average formation factor equation as \(\left( {F = \frac{1}{{\phi^{2.17} }}} \right)\) for the delineated reservoir in the study area.

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Authors and Affiliations

  1. Department of Physics, Michael Okpara University of Agriculture, Umudike, Nigeria

    Okechukwu E. Agbasi, Magnus U. Igboekwe & Godwil U. Chukwu

  2. Department of Physics, University of Uyo, Uyo, Nigeria

    Sunday E. Etuk

Authors
  1. Okechukwu E. Agbasi
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  2. Magnus U. Igboekwe
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  3. Godwil U. Chukwu
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  4. Sunday E. Etuk
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Correspondence to Okechukwu E. Agbasi.

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Agbasi, O.E., Igboekwe, M.U., Chukwu, G.U. et al. Formation evaluation of reservoirs in Eocene, Niger Delta Nigeria using modified formation factor from Pickett’s plot. Model. Earth Syst. Environ. 7, 331–339 (2021). https://doi.org/10.1007/s40808-020-01009-z

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