ISO/NP 26651-1

Natural gas upstream area — Determination of shale gas content — Part 1: Determination of total gas content using desorption method

Scope

The proposed international standard specifies a method for determining desorbed shale gas content at drilling sites. The principle of this method is to heat the core after being extracted from the drilling site to the temperature of the formation fluid and the bottom of the well, obtain the desorbed gas volume using a measuring device, regress the loss gas volume of the core from the bottom of the well to the wellhead through the relationship curve between desorption gas volume and time, then crush the sample to obtain the residual gas volume at the bottom of the well temperature, and finally add up the loss gas volume, desorption gas volume, and residual gas volume to obtain the shale gas content of the reservoir.