Effect of Clay Content Upon Some Physical Properties of Sandstone Reservoirs

  1. Richard H. Worden2 and
  2. Sadoon Morad3
  1. P. F. Worthington

Published Online: 17 MAR 2009

DOI: 10.1002/9781444304336.ch10

Clay Mineral Cements in Sandstones

Clay Mineral Cements in Sandstones

How to Cite

Worthington, P. F. (1999) Effect of Clay Content Upon Some Physical Properties of Sandstone Reservoirs, in Clay Mineral Cements in Sandstones (eds R. H. Worden and S. Morad), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304336.ch10

Editor Information

  1. 2

    Department of Earth Sciences, University of Liverpool, Brownlow Street, Liverpool L69 3GP, UK

  2. 3

    Department of Earth Sciences, Uppsala University, Villa vägen 16, S-752 36 Uppsala, Sweden

Author Information

  1. Gaffney, Cline & Associates, Bentley Hall, Blacknest, Alton, Hants GU34 4PU, UK

Publication History

  1. Published Online: 17 MAR 2009
  2. Published Print: 7 OCT 1999

ISBN Information

Print ISBN: 9781405105873

Online ISBN: 9781444304336



  • effect of clay content on physical properties of sandstone reservoirs;
  • petrophysical terminology;
  • petrophysical models;
  • total porosity model;
  • conjunctive use of petrophysical models;
  • deterministic interpretation within total porosity system;
  • effect of clay minerals on measured physical properties;
  • clay geometry


The presence of clays and clay minerals within a petroleum reservoir has an impact upon reservoir properties such as porosity and permeability, upon those measured physical data that are used to evaluate reservoir properties, and upon the forms of the petrophysical relationships between subsets of these parameters. Under these conditions, deterministic petrophysical interpretation takes place within either the effective porosity system or the total porosity system, one of which usually is adopted exclusively for interpretation purposes according to contemporary petroleum industry culture. A collation of some pertinent physical properties of clay minerals demonstrates their variability and emphasizes that each sandstone reservoir must be studied separately and thoroughly. The physical manifestation of clay minerals in measured physical data primarily is the result of their composition and internal structure. On the other hand, the manifestation of clays and clay minerals in the context of reservoir properties is principally morphological, as exemplified by microporosity, capillarity and sand–shale laminations. All these manifestations have an impact upon the interpretative petrophysical process itself. Future investigations should be directed at the quantitative incorporation of clay and clay-mineral effects within an overall continuum of reservoir behavioural characteristics.