Saturation exponent n in well log interpretation: Another look at the permissible range

Paulus S. Adisoemarta, George A. Anderson, Scott M Frailey, George B. Asquith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Saturation exponent n in Archie's water saturation equation is the exponent value in water saturation that establishes the relationship between water saturation of the rock to the ratio of fluid filled rock resistivity to the actual rock resistivity. Most theoretical derivations show that there is no exponent or that n is equal to one. However, decades of results from core analyses and openhole log analyses show n greater than one and most often assumed to be two. Most of the literature is in agreement that the saturation exponent is affected by wettability and saturation history (drainage or imbibition). Furthermore, the saturation exponent depends on rock type, primarily the manner in which the conductive water is connected and configured. Several authors quote values of n ranging from as low as 1 to over 20 for strongly oil wet rocks. Too often an assumed value is accepted as correct. This paper reevaluates the relationship between water saturation and rock resistivities in order to determine the significance of n and make recommendations on improving an assumed value for n.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001
PublisherSociety of Petroleum Engineers
ISBN (Print)9781555639280
StatePublished - Jan 1 2001
Externally publishedYes
EventSPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001 - Midland, United States
Duration: May 15 2001May 17 2001

Other

OtherSPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001
CountryUnited States
CityMidland
Period5/15/015/17/01

Fingerprint

Rocks
saturation
well
Saturation (materials composition)
Water
rock
electrical resistivity
water
Drainage
imbibition
Wetting
wettability
Fluids
drainage
fluid
oil
history

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Adisoemarta, P. S., Anderson, G. A., Frailey, S. M., & Asquith, G. B. (2001). Saturation exponent n in well log interpretation: Another look at the permissible range. In Society of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001 Society of Petroleum Engineers.

Saturation exponent n in well log interpretation : Another look at the permissible range. / Adisoemarta, Paulus S.; Anderson, George A.; Frailey, Scott M; Asquith, George B.

Society of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001. Society of Petroleum Engineers, 2001.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Adisoemarta, PS, Anderson, GA, Frailey, SM & Asquith, GB 2001, Saturation exponent n in well log interpretation: Another look at the permissible range. in Society of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001. Society of Petroleum Engineers, SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001, Midland, United States, 5/15/01.
Adisoemarta PS, Anderson GA, Frailey SM, Asquith GB. Saturation exponent n in well log interpretation: Another look at the permissible range. In Society of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001. Society of Petroleum Engineers. 2001
Adisoemarta, Paulus S. ; Anderson, George A. ; Frailey, Scott M ; Asquith, George B. / Saturation exponent n in well log interpretation : Another look at the permissible range. Society of Petroleum Engineers - SPE Permian Basin Oil and Gas Recovery Conference 2001, OGR 2001. Society of Petroleum Engineers, 2001.
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