Abstract

The methods of Brunauer, Emmett and Teller are used to measure the internal surface area by isothermal nitrogen adsorption. The success of the surface area measurement is evaluated in terms of the criteria set up by these early experimenters. It is concluded that the methods used in the study are satisfactory for the measurement of the internal surface of the sandstone cores under observation.

A sufficient number of sandstone samples are tested to determine that there is a trend of permeability with porosity divided by the square of the surface area. The fact that the trend follows about a 45 degree angle on a log-log scale indicates that the exponents of the variables are approximately correct.

Introduction

The study of the surface properties of a substance is a relatively new concept in the field of chemico-physics, and the explanations for surface behavior are still in an unproved, conjectural stage. An understanding of many of the basic principles of surface chemistry, however, has been developed to the point where scientific applications can be made with considerable confidence. In the industrial field, dye adsorption and color removal, catalytic cracking of complex hydrocarbons, and other organic segregational processes are all phenomena of surface properties. The mechanics of fluid flow often involve the surface effects of conducting media, because resistance to flow is largely dependent on surface area. A particular branch of surface chemistry [or surface physics] which is especially pertinent is the adsorption of gases on solids. This paper is particularly concerned with that branch, and the following discussion deals with the adsorption of gases on solids for the purpose of measuring surface area.

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