Gas Content: analytical method
The Analytical method is known as a simple method of indirectly estimating the gas content of a coal seam, as it
requires a small number of input parameters.
The formula used in the Analytical method is as follows:
The value of k varies from 5.7 to 20cm3/g and the n value ranges from 0.31 to
0.12 as shown in the following graph. The values of k & n can be obtained by using the ratio of fixed carbon
to volatile matter of coal in the seam. It can be seen that the estimate for the gas content using this method
is largely based on the saturation value for the coal and therefore while this method is valid for large depths,
it breaks down when it is applied to seams lying at shallow depths.
Direct Estimation
Indirect Estimation
Probability Estimation
