eprintid: 16811
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/68/11
datestamp: 2023-12-19 03:23:19
lastmod: 2023-12-19 03:23:19
status_changed: 2023-12-19 03:06:56
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: Japperi, N.S.
creators_name: Ahmad Fuad, M.F.I.
title: Improved water saturation estimation in shaly sandstone through variable cementation factor
ispublished: pub
keywords: Cementing (shafts); Electrolytes; Reservoirs (water), Arctangent; Electrolyte conduction; Formation factor; Percentage error; Pore space; Shaly sandstone; Surface conduction; Variable cementation factor; Water saturation modeling; Water saturations, Sandstone
note: cited By 1
abstract: Estimation of water saturation, Sw, in shaly sandstone is an intricate process. The surface conduction of clay minerals adds up to the electrolyte conduction in the pore spaces, thus generating high formation conductivity that overshadows the hydrocarbon effect. In each resistivity-based water saturation model, the key parameter is formation factor, F, which is typically derived from Archie�s Law. Referring to a log�log plot between formation factor and porosity, cementation factor reflects the slope of the straight line abiding Archie�s Law. In the case of shaly sandstone, derivation based on Archie�s Law in combination with Waxman�Smits equation leads to higher cementation factor, m*. In the shaly parts of the reservoir, high m* is counterbalanced by clay conductivity. Nonetheless, high m* used in clean parts increases Sw estimation. In this study, the variable cementation factor equation is introduced into the standard correlation of Sw versus Resistivity Index, RI, to develop a water saturation model with shaly sandstone parameters. Data retrieved from two fields that yielded mean arctangent absolute percentage error (MAAPE) were analysed to determine the difference between calculated and measured data within the 0.01�0.15 range for variable cementation factor method. The conventional method yielded maximum MAAPE at 0.46. © 2021, The Author(s).
date: 2022
publisher: Springer Science and Business Media Deutschland GmbH
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120306013&doi=10.1007%2fs13202-021-01391-z&partnerID=40&md5=0b9aa3587cce01b97876cfedcd9c6b7f
id_number: 10.1007/s13202-021-01391-z
full_text_status: none
publication: Journal of Petroleum Exploration and Production Technology
volume: 12
number: 5
pagerange: 1329-1339
refereed: TRUE
issn: 21900558
citation:   Wan Bakar, W.Z. and Mohd Saaid, I. and Ahmad, M.R. and Amir, Z. and Japperi, N.S. and Ahmad Fuad, M.F.I.  (2022) Improved water saturation estimation in shaly sandstone through variable cementation factor.  Journal of Petroleum Exploration and Production Technology, 12 (5).  pp. 1329-1339.  ISSN 21900558