Abstract:

The water out reservoirs of Changqing Gasfields are mainly distributed in Ma 5₁ submember.The reservoirs could be divided into water producing,water gas producing and gas producing types.The formation water of the reservoirs appeared to be lenticular discontinuous water bodies,but actually there is no boundary between gas and water,no fringe water and bottom water.20 water enriched areas could be found through lateral formation water tracing by using well log and seismic data.It is considered that the water of gas wells in large gas bearing areas would not influence gas producing;in marginal positions of water enriched areas,it is necessary to control producing pressure drop(<3 MPa)or to dewater so as to restart production.

Key words: Ma 5₁ reservoir, relative waterenriched area, flowable formation water, exploitation, Changqing Gasfields