School of Resources and Geosciences,China University of Mining and Technology

从生烃及储存条件2个方面分析了松河井田煤储层异常高压的形成机制,并探讨了其对煤层气开发的影响。研究表明:松河井田较高的煤变质程度有利于煤储层大量生烃;同时,高地应力造成的储层低渗透率,顶底板良好的封盖作用以及龙潭煤系较弱的水动力条件等为煤层气的储存提供了良好的条件,上述因素共同作用导致井田煤储层的异常高压。储层异常高压有利于煤层气的大量保存,增大了煤层气井排水降压的幅度,为煤层气地面开发提供了有利条件,但同时易造成煤储层较强的应力敏感性,因此建议降低煤层气井排采过程中的流压,以缓解应力敏感效应的不利影响。

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.

国家自然科学基金资助项目(51204162；41272154)；贵州省科技重大专项资助项目(黔科合重大专项字[2014]6002)；