Abstract
Abstract A new general correlation for estimating coal adsorption isotherms using log data has been developed. The "Langmuir Rank Equation," developed with the same dataset used for deriving Kim’s1 equation, provides an improved fit with the measurements. The Langmuir constants are derived from a coal rank indicator and adjusted for temperature. At elevated pressures, such as those in the San Juan basin, this approach may offer a substantial improvement in gas content estimates, as indicated in tests with a limited number of isotherms. The new correlation, adjusted for the effect of moisture, could be used with well logs alone in estimating gas content (saturated conditions) in coalbeds where no core samples are available. Since the equation provides the entire isotherm, it could also be used in the estimation of reserves. It could also be used when quality checking isotherms. It is important to note that both log-based models (Kim and Langmuir Rank) were developed based on isotherm data, and as such, assume the coal is saturated and cannot be used to identify undersaturated coals.
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