Exploitation Geology Types and Development Technology Modes of Coalbed Methane in Fanzhuang Block

The No.3 coal seam of Fanzhuang block was divided into four types of groundwater replenishment and six exploitation geology types. Then correspondi ng development modes of No.3 coalbed reservoir in Fanzhuang Block were put forward. The results showed that the non-desorbing reservoir with supply type hydrodyn amic conditions of groundwater had leakage recharge and high permeability. It was fitted for large space well pattern, small-scale fracture and high production system. The non-desorbing reservoir with replenishment type hydrodynamic conditions of groundwater had low ground water fluid potential and was ftted for large space well p attern, large-scale fracture and high production system. The non-desorbing reservoir with semi-open hydrodynamic conditions of groundwater had small but persistent s upplemental water and was fitted for small-scale fracture and high production system. The desorbing reservoir with semi-open hydrodynamic conditions of groundwater had small and poor supplemental water. It was ftted for large-scale fracture and high production system. The desorbing reservoir with enclosed type hydrodynamic con ditions of groundwater had high ground water fluid potential and fitted for large-scale fracture and low production system. The non-desorbing reservoir with enclosed typ e hydrodynamic conditions of groundwater had lowest permeability and was ftted for large-scale fracture, small space well pattern and low production system.