Shale Porosity Determination Methods and Their Influencing Factors

The pore structure of shale gas reservoir is of important research significance to the development and exploitation of shale gas and domestic scholars have done massive researches on the pore structure of shale. To better study the porosity features of shale gas reservoir, the common porosity determination methods and their influencing factors are analyzed in this paper and the following conclusions are made: the domestic common porosity determination methods are nitrogen adsorption method, mercury intrusion method, acoustic logging method and nuclear magnetic resonance method and all of them have the factors that may affect the porosity test results. Adsorbent is of important significance to the accuracy of nitrogen adsorption method; material hardness, sample preparation and contact angle pose great influences on mercury intrusion method; the interval transit time is a decisive influencing factor in the acoustic wave test; the instrument parameter, micro pore of sample and paramagnetic substance are the main factors that affect the experimental results of nuclear magnetic resonance. I hope that this research can provide certain reference to the domestic and foreign peers.