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ABSTRACT Nuclear 1 o g gi ng is not new to the oil industry. In the last few years this method of reservoir analysis has been applied to evaluating potash deposits in the United States and Canada. The purpose of this paper is to report results fromdeposits in the Paradox Basin in the United States and the Prairie Evaporite sectionin Saskatchewan, Canada. In order to pro p e r 1 y evaluate results of interpretation procedures as developed through field use it is necessary to briefly explain the principles of o p e r a t ion, the type of equipment available for field use, interpretation principles as a result of laboratory and field experience, actual f i e 1 d results in various areas and recommended operating procedures. INTRODUCTION The greater part of today's world supply of potash is o b t a ined from deposits of soluble potassium salts associated with other evaporite minerals as found in Saskatchewan and Utah in North America.
The problem of solving for the fraction of sylvite, carnallite, halite andinsoluble material in the Prairie Evaporite formation can be performed by asuitable interpretation program based on Gamma Ray, Sonic, Neutron and Caliperlogs. Empirical relations were established between the log values and theformation parameters, the result being a set of four simultaneous equationswhich may be reduced to obtain the desired fractions. Tedious hand calculationcan be eliminated by using computer techniques and automatic log digitizingmachines. Correlation between core and log analysis is good, and the speed andefficiency of the method is valuable in initial formation studies.
We1 logs are generally run to determine the presence or absence of hydrocarbons for correlation purposes and for determining reservoir properties. However, the mining industry has found that a proper suite of logs can aid in locating and evaluation a certain desired mineral or minerals. One such mineral being actively sought is potassium, or potash, which is used primarily in the manufacture of fertilizer. There are many potash minerals (see the 1949 AIME publication, "Industrial Minerals and Rocks"), but the five most commonly found are shown in Figure 1. They are usually found in the form of evaporite deposits, having been deposited during the evaporation of sea water.