大佛寺井田煤储层孔隙特征研究
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摘要
为了研究大佛寺井田煤样孔隙特征,采集大佛寺井田4#上煤层煤样,选取4#上煤层宏观煤样组分中的镜煤和暗煤,分别利用压汞试验、扫描电镜和低温吸附等方法对其进行测试。结果表明:大佛寺井田4#上暗煤以微孔和小孔为主,4#上镜煤以小孔和中孔为主,4#上镜煤和4#上暗煤都具有比较强的煤层气吸附能力,4#上镜煤的孔隙连通性较好,以开放型孔为主,4#上暗煤则主要以半封闭型的孔隙为主。扫描电镜结果表明大佛寺井田4#上暗煤可观察到煤表面存在一定数量的次生孔隙,但是整体孔隙的连通性较差。但4#上镜煤相比于4#上暗煤孔隙发育较好,清晰可见煤中出现了多道微裂隙和碎屑状的镜质体。综合来看,大佛寺井田4#上暗煤有助于煤层气的聚集,相对于暗煤而言,4#上镜煤利于煤层气的解吸和开发。
In order to research the pore characteristics of the coal sample in Dafosi coal mine,we selected vitrain and durain samples of Dafosi No.4 upper coal,and made the mercury injection,scanning electron microscopy and low-temperature liquid nitrogen adsorption experiments.The results show that components of No.4 upper durain and No.4 upper vitrain mainly consist of the micropores and transition pores at Dafosi mine field,the No.4 upper durain and No.4 upper vitrain are all conducive forcoal bed methane adsorption and accumulation.The No.4 upper vitrain is mainly dominated by the open hole,while the No.4 upper durain is mainly dominated by a semi closed pores,so the pore connectivity of No.4 upper vitrain is better than No.4 upper durain.The scanning electron microscopy test results No.4 upper durain develops a small number of secondary porosity,but the connectivity of overall pores is poor,which indicates the good adsorption capacity of coalbed methane.Compared with No.4 upper durain,the pores of No.4 upper vitrain well developed,a large number of clastic vitrinite materials and fractures exist on the surface of No.4 upper vitrain'parallel beddings,which indicates No.4 upper vitrain is favorable to the desorption and development of the coalbed methane.
In order to research the pore characteristics of the coal sample in Dafosi coal mine,we selected vitrain and durain samples of Dafosi No.4 upper coal,and made the mercury injection,scanning electron microscopy and low-temperature liquid nitrogen adsorption experiments.The results show that components of No.4 upper durain and No.4 upper vitrain mainly consist of the micropores and transition pores at Dafosi mine field,the No.4 upper durain and No.4 upper vitrain are all conducive forcoal bed methane adsorption and accumulation.The No.4 upper vitrain is mainly dominated by the open hole,while the No.4 upper durain is mainly dominated by a semi closed pores,so the pore connectivity of No.4 upper vitrain is better than No.4 upper durain.The scanning electron microscopy test results No.4 upper durain develops a small number of secondary porosity,but the connectivity of overall pores is poor,which indicates the good adsorption capacity of coalbed methane.Compared with No.4 upper durain,the pores of No.4 upper vitrain well developed,a large number of clastic vitrinite materials and fractures exist on the surface of No.4 upper vitrain'parallel beddings,which indicates No.4 upper vitrain is favorable to the desorption and development of the coalbed methane.
引文
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[2]YAO Yanbin,LIU Dameng,CAI Yidong,et al.Advanced characterization of pores and fractures in coals by nuclear magnetic resonance and X-ray computed tomography[J].Science China Earth Science,2010,53:854-862.
[3]李希建,林柏泉,施天虎.贵州典型矿区突出煤孔隙结构及其吸附特性实验研究[J].采矿与安全工程学报,2013,30(3):415-420.
[4]刘大锰,李振涛,蔡益栋.煤储层孔-裂隙非均质性及其地质影响因素研究进展[J].煤炭科学技术,2015,43(2):10-15.
[5]许满贵,孟然,韩金子,等.软煤体孔隙结构影响瓦斯吸附特性的试验研究[J].中国煤炭,2015,41(10):108-113.
[6]刘会彬,胡少博,尹润生,等.鄂尔多斯盆地彬长矿区煤层气赋存特征[J].煤田地质与勘探,2011,39(4):20-23.
[7]林柏泉,李庆钊,原德胜,等.彬长矿区低煤阶煤层气井的排采特征与井型优化[J].煤炭学报,2015,40(1):135-141.
[8]姜玮,吴财芳,赵凯,等.多煤层区煤储层孔隙特征及煤层气可采性研究[J].煤炭科学技术,2015,43(8):135-139.
[9]XOДOT B B.煤与瓦斯地质[M].宋士钊,译.北京:中国工业出版社,1966:19-28.
[10]吴建国,汤达祯,李松,等.云南恩洪地区煤储层孔裂隙特征及孔渗性分析[J].煤田地质与勘探,2012,40(4):29-33.
[11]路娜.黄骅坳陷长芦油田沙三段储层特征及控制因素[J].中国矿业,2018,27(S1):119-124.
[12]傅雪海,秦勇,薛秀谦,等.煤储层孔、裂隙系统分形研究[J].中国矿业大学学报,2001(3):11-14.
[13]张慧.中国煤的扫描电子显微镜研究[M].西安:地质出版社,2003:4-6.