鄂尔多斯盆地南北部侏罗系煤层含气性差异分析
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摘要
为了弄清造成鄂尔多斯盆地南北部侏罗系煤层含气性差异的主要原因,以盆地内煤层含气量与含气饱和度为基础,从煤层的生气能力、构造运动、水文地质条件与煤层顶底板岩性特征等4个方面进行了分析研究。结果表明,侏罗系煤层在盆地北部保存完整但含气性较差、南部保存不完整但含气性较好。南部煤层热演化程度较北部高,生气强度大,盆地南部地层水矿化度较盆地北部高,地下水动力条件较弱,有利于煤层气的富集和保存,而盆地南北部主要煤层顶底板岩性主要以泥岩为主,顶底板岩性对煤层气的富集影响大致相同。综合分析认为,影响鄂尔多斯盆地南北部侏罗系煤层含气性差异的主要因素是水文地质条件、构造运动和生气能力。
In order to find out the main reasons for the difference of gas bearing property of Jurassic coal seam in the northern and southern Ordos Basin,based on the gas content and gas saturation of coal seam in the basin,from the four aspects of the coal seam's gas generating capacity,tectonic movement,hydrogeological conditions and lithologic characteristics of roof and floor of coal seam,the analysis and research are carried out.The results show that Jurassic coal seam is intact in the northern part of the basin,but has poor gas content,the southern part is incomplete but has good gas content.The degree of thermal evolution of the coal seam in the south is higher than that in the north,and the gas intensity is strong,the mineralization degree of formation water in the southern part of the basin is higher than that in the northern part of the basin,and the dynamic condition of groundwater is weak,which is favorable for the enrichment and preservation of coalbed methane.The roof and floor of the main coal seam in the north and south of the basin is mainly mudstone,and the influence of them on coalbed methane is almost the same.The comprehensive analysis shows that the main factors affecting the gas-bearing difference of the Jurassic coal seam in the northern and southern Ordos Basin are hydrogeological conditions,tectonic movement and vitality.
In order to find out the main reasons for the difference of gas bearing property of Jurassic coal seam in the northern and southern Ordos Basin,based on the gas content and gas saturation of coal seam in the basin,from the four aspects of the coal seam's gas generating capacity,tectonic movement,hydrogeological conditions and lithologic characteristics of roof and floor of coal seam,the analysis and research are carried out.The results show that Jurassic coal seam is intact in the northern part of the basin,but has poor gas content,the southern part is incomplete but has good gas content.The degree of thermal evolution of the coal seam in the south is higher than that in the north,and the gas intensity is strong,the mineralization degree of formation water in the southern part of the basin is higher than that in the northern part of the basin,and the dynamic condition of groundwater is weak,which is favorable for the enrichment and preservation of coalbed methane.The roof and floor of the main coal seam in the north and south of the basin is mainly mudstone,and the influence of them on coalbed methane is almost the same.The comprehensive analysis shows that the main factors affecting the gas-bearing difference of the Jurassic coal seam in the northern and southern Ordos Basin are hydrogeological conditions,tectonic movement and vitality.
引文
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[19]黄兴龙.赵官煤田煤层气赋存特征及其控制因素研究[J].煤炭科学技术,2018,46(4):196-201.HUANG Xinglong.Study on occurrence characteristics and controlling factors of coalbed methane in Zhaoguan Coalfield[J].Coal Science and Technology,2018,46(4):196-201.
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[2]王双明.鄂尔多斯盆地叠合演化及构造对成煤作用的控制[J].地学前缘,2017,24(2):54-63.WANG Shuangming.Ordos Basin superposed evolution and structural controls of coal forming activities[J].Earth Science Frontiers,2017,24(2):54-63.
[3]潘新志,叶建平,孙新阳,等.鄂尔多斯盆地神府地区中低阶煤层气勘探潜力分析[J].煤炭科学技术,2015,43(9):65-70.PAN Xinzhi,YE Jianping,SUN Xinyang,et al.Analysis on exploration potential of mid-low rank coalbed methane in Shenfu Area of Ordos Basin[J].Coal Science and Technology,2015,43(9):65-70.
[4]许浩,汤达祯,唐书恒,等.鄂尔多斯盆地西部侏罗系煤储层特征及有利区预测[J].煤田地质与勘探,2010,38(1):26-32.XU Hao,TANG Dazhen,TANG Shuheng,et al.Coal reservoir characteristics and prospective areas for Jurissic CBM exploitation in western Ordos basin[J].Coal Geology and Exploration,2010,38(1):26-32.
[5]田文广,邵龙义,张继东,等.鄂尔多斯盆地南部侏罗系煤层气成因探究[J].中国矿业,2015,24(5):81-85.TIAN Wenguang,SHAO Longyi,ZHANG Jidong,et al.Analysis of genetic type of the coalbed methane of Jurassic formation[J].China Mining Magazine,2015,24(5):81-85.
[6]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.
[7]孙斌,孙粉锦,田文广,等.鄂尔多斯盆地乌审旗地区煤层气富集主控因素及其勘探方向[J].天然气工业,2011,31(2):34-38.SUN Bin,SUN Fenjin,TIAN Wenguang,et al.Controlling factors of coalbed methane enrichment in the Wushenqi Area,Ordos Basin[J].Nature Gas Industry,2011,31(2):34-38.
[8]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,YUAN 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.
[9]马财林,张铭记,权海奇,等.鄂尔多斯盆地侏罗系煤层气勘探开发潜力评价[C]//2010年全国煤层气学术研讨会论文集,2010:157-166.
[10]晋香兰,张泓.鄂尔多斯盆地侏罗系低煤阶煤层气系统演化[J].煤田地质与勘探,2014,42(5):17-24.JIN Xianglan,ZHANG Hong.Evolution of Jurassic low rank coal CBM system in Ordos Basin[J].Coal Geology and Exploration,2014,42(5):17-24.
[11]蔺亚兵,宋一民,蒋同昌,等.黄陇煤田永陇矿区煤层气成藏条件及主控因素研究[J].煤炭科学技术,2018,46(3):168-175.LIN Yabing,SONG Yimin,JIANG Tongchang,et al.Study on forming conditions and main controlling factors of CBM reservoirs in Yonglong Mining Area of Huanglong Coalfield[J].Coal Science and Technology,2018,46(3):168-175.
[12]王双明.鄂尔多斯盆地构造演化和构造控煤作用[J].地质通报,2011,30(4):544-552.WANG Shuangming.Ordos basin tectonic evolution and structural control of coal[J].Geological Bulletin of China,2011,30(4):544-552.
[13]晋香兰,张泓.鄂尔多斯盆地侏罗系成煤系统[J].煤炭学报,2014,39(S1):191-197.JIN Xianglan,ZHANG Hong.Jurassic coal system in the Ordos Basin[J].Journal of China Coal Society,2014,39(S1):191-197.
[14]张岳桥,廖昌珍,施炜,等.论鄂尔多斯盆地及其周缘侏罗纪变形[J].地学前缘,2007,14(2):182-196.ZHANG Yueqiao,LIAO Changzhen,SHI Wei,et al.On the Jurassic deformation in and around the Ordos basin,north China[J].Earth Science Frontiers,2007,14(2):182-196.
[15]刘池洋,赵红格,桂小军,等.鄂尔多斯盆地演化-改造的时空坐标及其成藏(矿)响应[J].地质学报,2006,80(5):617-638.LIU Chiyang,ZHAO Hongge,GUI Xiaojun,et al.Space-time coordinate of the evolution and reformation and mineralization response in Ordos basin[J].Acta Geologica Sinica,2006,80(5):617-638.
[16]朱亚茹,孙蓓蕾,曾凡桂,等.西山煤田古交矿区煤层气藏水文地质特征及其控气作用[J].煤炭学报,2018,43(3):759-769.ZHU Yaru,SUN Beilei,ZENG Fangui,et al.Hydrogeological characteristics of CBM reservoirs and their controlling effects in Gujiao Mining Area,Xishan Coalfield[J].Journal of China Coal Society,2018,43(3):759-769.
[17]楼章华,程军蕊,金爱民.沉积盆地地下水动力场特征研究-以松辽盆地为例[J].沉积学报,2006,24(2):193-201.LOU Zhanghua,CHENG Junrui,JIN Aimin.Origin and evolution of the hydrodynamics in sedimentary basins-A case study of the Songliao Basin[J].Acta Sedimentologica Sinica,2006,24(2):193-201.
[18]魏迎春,张强,王安民,等.准噶尔盆地南缘煤系水矿化度对低煤阶煤层气的影响[J].煤田地质与勘探,2016,44(1):31-37.WEI Yingchun,ZHANG Qiang,WANG Anmin,et al.The influence of the salinity of ground water in coal measures on low rank coalbed methane in the south margin of Junggar basin[J].Coal Geology and Exploration,2016,44(1):31-37.
[19]黄兴龙.赵官煤田煤层气赋存特征及其控制因素研究[J].煤炭科学技术,2018,46(4):196-201.HUANG Xinglong.Study on occurrence characteristics and controlling factors of coalbed methane in Zhaoguan Coalfield[J].Coal Science and Technology,2018,46(4):196-201.
[20]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.