Comparison of void volume for volumetric adsorption studies on shales from India

Correct determination of void volume is essential for carrying out adsorption isotherm experiments accurately. This paper presents the void volume data of two as-received shales, namely Salanpur and KG shales, India. Void volume experiments are conducted using helium and argon at 40 °C and up to a pressure of ∼9.2 MPa. Difference in void volumes measured using helium and argon are lying in the range of 0.4–1.2 % and 0.2–1.6 % for KG and Salanpur shale respectively. The standard deviation percentage of argon is twice of helium, suggesting void volume estimation using helium to be more accurate than argon.