High pressure formation mechanism of reservoir in Songhe Mine Field and its impact to coalbed methane development

from the aspeots of the hydrocaron generaton and storage con tions ,the paper analzed the abnormal high pressure formation mechanism of the reservoir in Songhe Mine Field and discussed the formation mechanism affected tothe coalbed methane development The study showed that the high coal metamorphismn degree of Songhe Mie Field could be favorablefor the cal reservoir to have great hydrocaroon generations.Meanwi e,the low permeability of the coalreservoir caused by the igh geostress.a good seaig role ofrof nd f r wealk water dynamic condtions of Longtan coal measures and others could provide good conditions to the storage of the c aled methane and thus the joint roles of the above factors caused abnormal high pressure of the coal reservoir in the mine fea.The abnomal igh pressure of the coal reservoir would be favorable for the great storage of the coalbed methane,could ighly increase the water d ischarging and pressurereleased ofthecoalbed nethane well would provide favorable contitions for the surace development of the coaled nethane and would cause a high stress senstviy of the coal esenoi.Therefore,the paper proposed to ighly reduce the fiow pressure in the drainage pro.ess of the coalbed methane wel. in orer to release the unfavorable nfutencesof the stress sensitivity effect.