id	keyword
esrj-58000	coal
esrj-58000	reservoir
esrj-58000	methane
esrj-58000	permeability
esrj-58000	production
esrj-58000	coalbed
esrj-58000	et al
esrj-58000	gas
esrj-58000	coal reservoir
esrj-58000	type
esrj-58000	pressure
esrj-58000	methane production
esrj-58000	stress
esrj-58000	structure
esrj-58000	thickness