Study on pore features and adsorption storage performances of low rank coal reservoir in Huanglong Coalfield

In order to study the pore features and the adsorption and storage performances of the low rank coal reservoir in Huanglong Jurassic Coalfield, the coal samples were collected from different mining areas in Huanglong Coalfield, and a liquid nitrogen adsorption, scanning electron microscopy, isotherm adsorption test and other test method were applied to study the coal specific surface area, the pore volume features, the pore features, the pore diameter distribution features, micro crack development degree as well as the adsorption features of the coal samples. The study results showed that the specific surface area of the low rank coal BET in Huangl ong Coalfield was concentrated and distributed in 1 ~ 5 m2/g and the specific surface area was small. The interval of the BJH pore volume distribution was concentrate d ranging from 0.003 ~ 0.030 m L/g, and the coal pore distribution features mainly were the micro pore and small pore as main and the medium pore would be second. The micro pore on the coal sample surface was developed, the Langmuir volume was distributed in 7.95 ~ 16.52m3/t, the Langmuir pressure was distributed at 1.22 ~ 5. 77 MPa, the adsorption capacity was general and the desorption was easy. In combined with the previous geological survey information, the study held that Binchang, J iaoping and Huangling Mining Areas would be favorable to the coalbed methane exploration and development.