eprintid: 11183
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/11/83
datestamp: 2023-11-10 03:25:42
lastmod: 2023-11-10 03:25:42
status_changed: 2023-11-10 01:14:39
type: article
metadata_visibility: show
creators_name: Wan Bakar, W.Z.
creators_name: Mohd Saaid, I.
creators_name: Ahmad, M.R.
creators_name: Amir, Z.
creators_name: Mahat, S.Q.
title: Derivation of formation factor in shaly sandstone with geometry and clay conductivity effects
ispublished: pub
keywords: Core analysis; Geometry; Porosity; Sandstone; Uncertainty analysis; Well logging, Archie's Law; Formation factor; Geometric effects; Log-log plots; Mathematical equations; Resistivity logs; Water saturations; Well log data, Salinity measurement, clay; conductivity; core analysis; equation; geometry; numerical model; porosity; sandstone; well logging
note: cited By 9
abstract: The use of Archie's Law to estimate formation factor in low porosity and high shaliness formation is associated with high uncertainties. The core analysis data in this type of formation is normally scattered and shows deviation from the Archie's straight line on the log-log plot of formation factor vs. porosity. The same deviation has also been observed in resistivity log data. Using Archie's Law for this type of formation generates inaccurate petrophysical constant i.e cementation factor, m that might consequently give inexact prediction of water saturation. Recently established mathematical equations modelled the deviation to geometric effect without considering the effect of clay conductivity. In this paper we established an improved mathematical equation to relate this phenomenon to both geometric and clay conductivity effect. This equation was derived from the original theory on excess clay conductivity and is easy to be applied using parameters from well log data. This equation had shown good match with our experimental work data as well as core analysis data from three (3) different regions. © 2019 Elsevier B.V.
date: 2019
publisher: Elsevier B.V.
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070985623&doi=10.1016%2fj.petrol.2019.106359&partnerID=40&md5=0ef9e3981a318af524e24c7ee83457ff
id_number: 10.1016/j.petrol.2019.106359
full_text_status: none
publication: Journal of Petroleum Science and Engineering
volume: 182
refereed: TRUE
issn: 09204105
citation:   Wan Bakar, W.Z. and Mohd Saaid, I. and Ahmad, M.R. and Amir, Z. and Mahat, S.Q.  (2019) Derivation of formation factor in shaly sandstone with geometry and clay conductivity effects.  Journal of Petroleum Science and Engineering, 182.   ISSN 09204105