THE RESEARCH METHOD AND ITS GEOLOGICAL SIGNIFICANCE OF MICROPOROUS GEOMETRY IN THE CAPPING—BEDS OF NATURAL GAS

On the basis of the principles of existance of adsorption and condensation on the sur-face of micropores,the authors obtain the adsorption and desorption isotherms of microp-orosity through the measurements by using the ST-03 type specific surface pore diame-ter.By use of their geometry and the research results of adsorbed capacity of microporosi-ty,they decide the microporous geometry in the capping-beds of natural gas and make adistinction between pores and cracks in order to lay foundation for studying the primaryand post-primary migrations of oil and gas.