Estimating Volume of Shale in a Clastic Niger Delta Reservoir from Well Logs: A Comparative Study - International Journal of Geosciences

IJG > Vol.12 No.10, October 2021

International Journal of Geosciences

Volume 12, Issue 10 (October 2021)

ISSN Print: 2156-8359 ISSN Online: 2156-8367

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Estimating Volume of Shale in a Clastic Niger Delta Reservoir from Well Logs: A Comparative Study ()

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DOI: 10.4236/ijg.2021.1210049 252 Downloads 1,223 Views Citations

Author(s)

Vianney M. Kamayou^1*, Chukwuemeka N. Ehirim², Sunday S. Ikiensikimama³

Affiliation(s)

¹Africa Centre of Excellence, Centre for Oilfield Chemicals Research (ACE-CEFOR), University of Port Harcourt, Choba, Port Har-court, Rivers State, Nigeria.
²Department of Physics, University of Port Harcourt, Choba, Port Harcourt, Rivers State, Nigeria.
³Department of Petroleum and Gas Engineering, University of Port Harcourt, Choba, Port Harcourt, Rivers State, Nigeria.

ABSTRACT

The volume of shale (V_sh) is a critical parameter in petrophysical analysis that enables the accurate estimation of other petrophysical parameters like effective porosity, saturation and Net-to-Gross. This is an important step in characterization of reservoirs as well as valuation of hydrocarbon potentials. GR (Gamma Ray), Neutron and Density as well as Potassium, Uranium and Thorium logs were adopted to estimate and analyze V_sh for sand 4 reservoir interval across five wells using the empirical (GR-linear and non-linear) and Neutron-Density methods. Results show that V_sh estimated by the different methods varied from 0.24 - 0.39 for the GR linear method (highest), 0.12 - 0.24 for the Larionov method (intermediate), and 0.04 - 0.28 for the Neutron-Density method (lowest). Although the Neutron-Density method gives the lowest values of volume of shale, this does not translate to the most accurate and reliable results. This may be attributed to the non-singularity in measurements and varying sensitivities of the well logs used in this method as well as the complexities of the wellbore condition. The GR non-linear (Larionov) method provides consistent and comparable volume of shale estimations with the neutron-density method than the linear GR method and consequently, the non-linear GR method is recommended for estimation of V_sh in the studied field.

KEYWORDS

Volume of Shale, GRI, GR Method, Neutron-Density Method

Share and Cite:

Kamayou, V. , Ehirim, C. and Ikiensikimama, S. (2021) Estimating Volume of Shale in a Clastic Niger Delta Reservoir from Well Logs: A Comparative Study. International Journal of Geosciences, 12, 949-959. doi: 10.4236/ijg.2021.1210049.

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