黄陇煤田低煤阶煤储层孔隙特征及吸附储集性能研究
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摘要
为了研究黄陇侏罗纪煤田低煤阶煤煤储层孔隙特征和吸附储集性能,采集了黄陇煤田不同矿区的煤样,利用液氮吸附、扫描电镜和等温吸附试验等测试方法,研究了低煤阶煤储层煤比表面积、孔容特征、孔隙特征、孔径分布特征、微裂隙发育程度及煤样的吸附特征。研究结果表明:黄陇煤田低煤阶煤BET比表面积集中分布在1~5 m~2/g,比表面积较小;BJH孔容分布区间集中在0.003~0.030m L/g,煤孔径分布特征主要以微孔和小孔为主,中孔次之;煤样表面微孔隙发育,Langmuir体积分布在7.95~16.52 m3/t,Langmuir压力分布在1.22~5.77 MPa,吸附能力一般,易解吸。结合以往地勘资料研究认为彬长、焦平及黄陵矿区有利于煤层气的勘探开发。
In order to study the pore features and the adsorption and storage performances of the low rank coal reservoir in Huanglong Jurassic Coalfield,the coal samples were collected from different mining areas in Huanglong Coalfield,and a liquid nitrogen adsorption,scanning electron microscopy,isotherm adsorption test and other test method were applied to study the coal specific surface area,the pore volume features,the pore features,the pore diameter distribution features,micro crack development degree as well as the adsorption features of the coal samples. The study results showed that the specific surface area of the low rank coal BET in Huanglong Coalfield was concentrated and distributed in 1 ~ 5 m~2/g and the specific surface area was small. The interval of the BJH pore volume distribution was concentrated ranging from 0.003 ~ 0.030 m L/g,and the coal pore distribution features mainly were the micro pore and small pore as main and the medium pore would be second. The micro pore on the coal sample surface was developed,the Langmuir volume was distributed in 7.95 ~ 16.52m~3/t,the Langmuir pressure was distributed at 1.22 ~ 5.77 MPa,the adsorption capacity was general and the desorption was easy. In combined with the previous geological survey information,the study held that Binchang,Jiaoping and Huangling Mining Areas would be favorable to the coalbed methane exploration and development.
In order to study the pore features and the adsorption and storage performances of the low rank coal reservoir in Huanglong Jurassic Coalfield,the coal samples were collected from different mining areas in Huanglong Coalfield,and a liquid nitrogen adsorption,scanning electron microscopy,isotherm adsorption test and other test method were applied to study the coal specific surface area,the pore volume features,the pore features,the pore diameter distribution features,micro crack development degree as well as the adsorption features of the coal samples. The study results showed that the specific surface area of the low rank coal BET in Huanglong Coalfield was concentrated and distributed in 1 ~ 5 m~2/g and the specific surface area was small. The interval of the BJH pore volume distribution was concentrated ranging from 0.003 ~ 0.030 m L/g,and the coal pore distribution features mainly were the micro pore and small pore as main and the medium pore would be second. The micro pore on the coal sample surface was developed,the Langmuir volume was distributed in 7.95 ~ 16.52m~3/t,the Langmuir pressure was distributed at 1.22 ~ 5.77 MPa,the adsorption capacity was general and the desorption was easy. In combined with the previous geological survey information,the study held that Binchang,Jiaoping and Huangling Mining Areas would be favorable to the coalbed methane exploration and development.
引文
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[2]孙平,王勃,孙粉锦,等.中国低煤阶煤层气成藏模式研究[J].石油学报,2009,30(5):648-653.Sun Ping,Wang Bo,Sun Fenjin,et al.Research on reservoir patterns of low-rank coalbed methane in China.[J].Acta Petrolei Sinica,2009,30(5):648-653.
[3]王勃,李景明,张义,等.中国低煤阶煤层气地质特征[J].石油勘探与开发,2009,36(1):30-34.Wang Bo,Li Jingming,Zhang Yi,et al.Geological characteristics of low rank coalbed methane,China[J].Petroleum Exploration and Development,2009,36(1):30-34.
[4]张新民,庄军,张遂安.中国煤层气地质与资源评价[M].北京:科学出版社,2003:222-224.
[5]王兴.陕西省煤层气[M].西安:陕西科学技术出版社,2012:223-226.
[6]龙玲,王兴.陕西彬长矿区煤层气赋存特征及资源利用[J].中国煤田地质,2005,17(5):44-46.Long Ling,Wang Xing.CBM hosting feature and resource utilization in Binchang Coal Mining Area[J].China Coal Geology,2005,17(5):44-46.
[7]杨新辉.黄陇煤田煤层气储层特征[J].煤田地质与勘探,2015,43(4):41-45.Yang Xinhui.Characteristics of CBM reservoir in HuanglingLongxian coalfield[J].Coal Geology and Exploration,2015,43(4):41-45.
[8]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):21-23.Liu Huibin,Hu Shaobo,Yin Runsheng,et al.Occurrence features of coalbed methane of Binchang mining area in Ordos basin[J].Coal Geology and Exploration,2011,39(4):21-23.
[9]薛鸣,许敏.焦坪矿区煤层气地面开发实践与思考[J].陕西煤炭,2014,32(4):42-44.Xue Ming,Xu Min.CBM surface development practice and thinking[J].Shaanxi Coal,2014,32(4):42-44.
[10]茹亭.焦平区块煤层气水平井井型优化研究[D].西安:西安石油大学,2013.
[11]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.Lin Baiquan,Li Qingzhao,Yuang Desheng,et al.CBM production character and surface well selection in Binchang low rank coal field[J].Journal of China Coal Society,2015,40(1):135-141.
[12]杜玉娥.煤的孔隙特征对煤层气解吸的影响[D].西安:西安科技大学,2010.
[13]蔺亚兵,贾雪梅,马东民,等.不同变质成因无烟煤孔隙特征及其对瓦斯突出的影响[J].煤炭工程,2013(5):99-102.Lin Yabing,Jia Xuemei,Ma Dongmin,et al.Study on the pore properties of different metamorphic causes anthracite body structure coals and the effects on gas outburst based[J].Coal Engineering,2013(5):99-102.
[14]马东民,张辉,王贵荣,等.胡家河井田煤层气等压吸附/解吸特征研究[J].煤炭科学技术,2016,44(4):119-123.Ma Dongmin,Zhang Hui,Wang Guirong,et al.Study on isobaric adsorption/desorption features of coalbed methane in hujiahe coal field[J].Coal Science and Technology,2016,44(4):119-123.
[15]马东民,李来新,李小平,等.大佛寺井田4号煤CH4与CO2吸附解吸实验比较[J].煤炭学报,2014,39(9):1938-1944.Ma Dongmin,Li Laixin,Li Xiaoping,et al.Contrastive experiment of adsorption-desorption between CH4and CO2in Coal Seam 4 of Dafosi Coal Mine[J].Journal of China Coal Society,2014,39(9):1938-1944.
[16]段利江,唐书恒,刘洪林.煤储层物性对甲烷解吸及采出的影响[J].西安科技大学学报,2008,28(4):680-684.Duan Lijiang,Tang Shuheng,Liu Honglin.Impact of coal reservoir physical property on CBM desorption and production[J].Journal of Xi'an University of Science and Technology,2008,28(4):680-684.
[17]郑德顺,周璐,李明龙,等.煤层气储存富集主控因素简述[J].中州煤炭,2013,34(3):23-26,36.Zheng Deshun,Zhou Lu,Li Minglong,et al.A review on controlling factors of storage and enrichment CBM[J].Zhongzhou Coal,2013,34(3):23-26,36.
[18]蔺亚兵,贾雪梅,马东民.基于液氮吸附法对煤储层孔隙特征研究与应用[J].煤炭科学技术,2016,44(3):135-140.Lin Yabing,Jia Xuemei,Ma Dongmin.Research and application of liquid nitrogen adsorption pore characteristics of coal[J].Coal Science and Technology,2016,44(3):135-140.
[19]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.