Method for quantitatively characterizing content of open holes in coal

The invention discloses a method for quantitatively characterizing the content of open holes in coa. The method comprises the following steps of 1, carrying out mercury intrusion method test on a collected coal sample to obtain a corresponding mercury intrusion method hysteresis loop area and mercury injection and removal curves; 2, synchronously carrying out a low-temperature liquid nitrogen absorption/desorption test on the collected coal sample to obtain a corresponding low-temperature liquid nitrogen absorption/desorption hysteresis loop area and an absorption/desorption curve; 3, distinguishing an open hole type coal sample or an ink bottle hole type coal sample according to the hysteresis loop type of the low-temperature liquid nitrogen absorption/desorption curve obtained in the step 2; and 4, characterizing the open hole content of the coal with the corresponding hole diameter according to the hole type distinguishing result of the coal sample in the step 3 and the corresponding hole diameter. The met