乌鲁木齐-大黄山地区煤层气地质条件研究
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摘要
针对乌鲁木齐-大黄山地区煤层气开发井产气量差异较大这一问题,在施工工艺和排采制度等外在因素影响大致相同的前提下,地质因素成为影响煤层气井产气量差异较大的主要因素。为此,对研究区煤层气地质条件、含气性特征、储层特征等方面进行了分析研究。结果显示研究区煤层具有厚度大、层数多、变质程度低,区内推覆构造发育,地层变形强烈,煤层倾角较大的特点;主要目标煤层空气干燥基含气量0.76~14.2 m~3/t,平均8.19 m~3/t,CH_4体积分数64.68%~89.65%,平均低于80%;煤储层中大、中孔隙所占比例较高,孔隙充填度较低,连通性较好,不同煤层对CH_4吸附储存能力有所不同,渗透率分布不均,储层压力梯度大部分低于0.95 MPa/hm,属于欠压储层。
According to a big difference between the gas productions of the coalbed methane developed wells in Urumqi-Dahuangshan Area,under the premise of the construction technique and gas drainage system as well as external factors affected as the same,the geological factor became the major factor affected to the high differences to the gas production of the coalbed methane wells. Therefore an analysis study was conducted on the coalbed methane geological conditions,gas content features,reservoir features and others in these area. The study results showed that the seams in the study area had the characteristics of the high thickness,multi seams,low metamorphic grade,the nappe structure developed within the study area,strata deformation serious and the high inclined seam. The air dried basis gas content of the main target seam was 0.76~ 14.2 m~3/t and the average gas content was 8.19 m~3/t. The methane concentration was 64.68% ~ 89.65% and the average concentration was lower than 80%. In coal reservoir,the large and medium pores were taken a high percentage,the pore filled was low,the connection was good,different seam would have a different methane adsorption capacity and the permeability distribution was uneven. The pressure gradient of coal reservoir mostly lower than 0.95 MPa/hm and reservoir was the under pressure reservoir.
According to a big difference between the gas productions of the coalbed methane developed wells in Urumqi-Dahuangshan Area,under the premise of the construction technique and gas drainage system as well as external factors affected as the same,the geological factor became the major factor affected to the high differences to the gas production of the coalbed methane wells. Therefore an analysis study was conducted on the coalbed methane geological conditions,gas content features,reservoir features and others in these area. The study results showed that the seams in the study area had the characteristics of the high thickness,multi seams,low metamorphic grade,the nappe structure developed within the study area,strata deformation serious and the high inclined seam. The air dried basis gas content of the main target seam was 0.76~ 14.2 m~3/t and the average gas content was 8.19 m~3/t. The methane concentration was 64.68% ~ 89.65% and the average concentration was lower than 80%. In coal reservoir,the large and medium pores were taken a high percentage,the pore filled was low,the connection was good,different seam would have a different methane adsorption capacity and the permeability distribution was uneven. The pressure gradient of coal reservoir mostly lower than 0.95 MPa/hm and reservoir was the under pressure reservoir.
引文
[1]陈刚.准噶尔盆地彩南地区深层低阶煤吸附特征及其影响因素[J].煤田地质与勘探,2016,44(2):50-54.CHEN Gang. The adsorption characteristics and affecting factors of deep low-rank coal in Cainan area of Junggar Basin[J]. Coal Geology&Exploration,2016,44(2):50-54.
[2]王德利,李凤义,杨曙光.准南煤田煤储层和围岩对煤层气聚集的影响分析[J].中国煤层气,2013,10(2):7-11.WANG Deli,Li Fengyi,YANG Shuguang. The influence analysis of coal reservoir and surrounding rock on CBM accumulation in Zhunnan Coalfield[J].China Coalbed Methane,2013,10(2):7-11.
[3]张培河,刘钰辉,王正喜,等.基于生产数据分析的沁水盆地南部煤层气井产能控制地质因素研究[J].天然气地球科学,2011,2(5):909-914.ZHANG Peihe,LIU Yuhui,WANG Zhengxi,et al. Geological factors of production control of CBM well in South Qinshui Basin[J].Natural Gas Geoscience,2011,2(5):909-914.
[4]李臣臣,刘大锰,蔡益栋,等.新疆准南地区煤储层显微裂隙特征及矿物控因分析[J].煤炭科学技术,2015,43(12):144-151.LI Chenchen,LIU Dameng,CAI Yidong,et al. Analysis on microfracture characteristics and control action of mineral genesis of coal reservoir in south margin of Junggar Basin,Xinjiang[J].Coal Science and Technology 2015,43(12):144-151.
[5]李小彦,钟铃文,李瑞明,等.乌鲁木齐河东河西矿区煤层气储层特征[J].中国煤田地质,2003,15(5):19-21.LI Xiaoyan,ZHONG Lingwen,LI Ruiming,et al. Characteristics of coalbed methane reservoir in Hedong-Hexi Area,Urumqi[J].Coal Geology of China,2003,15(5):19-21.
[6]孙钦平,孙斌,孙粉锦,等.准噶尔盆地东南部低煤阶煤层气富集条件及主控因素[J].高校地质学报,2012,18(3):460-464.SUN Qinping,SUN Bin,SUN Fenjin,et al. Accumulation and geological controls of low-rank coalbed methane in southeastern Junggar Basin[J]. Geological Journal of China Universities,2012,18(3):460-464.
[7]王屿涛,谢姝,刘全艳,等.准噶尔盆地低阶煤煤层气资源及勘探潜力分析[J].新疆石油学院学报,2002,14(3):5-7.WANG Yutao,XIE Shu,LIU Quanyan,et al. Low-rank coalbed methane resources and exploration potential in Junggar Basin[J].Journal of Xinjiang Petroleum Institute,2002,14(3):5-7.
[8]尹淮新,谈红梅,坛俊颖,等.新疆低煤阶煤层气勘探选区评价标准的探讨[J].中国煤层气,2009,6(6):9-13.YIN Huaixin,TAN Hongmei,TAN Junying,et al. Discussion on criteria for evaluation of selected target areas in prospecting CBM in low-rank coal in Xingjiang[J]. China Coalbed Methane,2009,6(6):9-13.
[9]尹淮新.新疆阜康煤矿区煤层气资源勘探前景及开发建议[J].中国煤层气,2009,6(2):16-18.YIN Huaixin. Prospect of exploration of CBM resources in Fukang Coal Mining Area in Xinjiang and recommendations on its development[J]. China Coalbed Methane,2009,6(2):16-18.
[10]李忠权,陈更生,张寿庭.新疆准噶尔盆地南缘拉张伸展动力学环境的探讨[J].高校地质学报,1998,4(1):73-78.LI Zhongquan,CHEN Gengsheng,ZHANG Shouting. Discussion on the extensional dynamic setting in the south margin of Junggar Basin,Xinjiang,China[J].Geological Journal of China Universities,1998,4(1):73-78.
[11]崔思华,刘洪林,王勃,等.准噶尔盆地低煤级煤层气成藏地质特征[J].现代地质,2007,21(4):719-724.CUI Sihua,LIU Honglin,WANG Bo,et al. Trapping characteristics of coalbed methane in low-rank coal of Junggar Basin[J].Geoscience,2007,21(4):719-724.
[12]田继军,杨曙光.准噶尔盆地南缘下-中侏罗统层序地层格架与聚煤规律[J].煤炭学报,2011,36(1):58-64.TIAN Jijun,YANG Shuguang. Sequence strata and coal accumulation of lower and middle Jurassic formation from southern margin of zhunggar Basin[J]. Journal of China Coal Society,2011,36(1):58-64.
[13]林海飞,程博,李树刚,等.新疆阜康矿区煤层孔隙结构特征的氮吸附实验研究[J].西安科技大学学报,2015,35(6):721-726.LIN Haifei,CHENG Bo,LI Shugang,et al. Nitrogen adsorption experimental study on pore structure characteristics of coal seams in Xinjiang Fukang Mining Area[J]. Journal of Xi’an University of Science and Technology,2015,35(6):721-726.
[14]薛喜成,高雅翠.淮南煤田煤体结构分布特征及其控制因素探讨[J].西安科技大学学报,2006,26(2):193-195.XUE Xicheng,GAO Yacui. Distribution characteristics and controlling factors of coal in Huainan Coalfield[J]. Journal of Xi'an University of Science and Technology,2006,26(2):193-195.
[15]吕闰生,彭苏萍,徐延勇.含瓦斯煤体渗透率与煤体结构关系的实验[J].重庆大学学报,2012,35(7):114-118.LYU Runsheng,PENG Suping,XU Yanyong. Experiments on the relationship between permeability of gas-bearing coal and coal body structure[J]. Journal of Chongqing University,2012,35(7):114-118.
[16]郭红玉,苏现波,夏大平,等.煤储层渗透率与地质强度指标的关系研究及意义[J].煤炭学报,2010,35(8):1319-1322.GUO Hongyu,SU Xianbo,XIA Daping,et al. Relationship of the permeability and geological strength index(GSI)of coal reservoir and its significance[J]. Journal of China Coal Society 2010,35(8):1319-1322.
[17]王维旭,贺满江,王希友,等.筠连区块煤层气产能主控因素分析及综合评价[J].煤炭科学技术,2017,45(9):194-200.WANG Weixu,HE Manjiang,WANG Xiyou,et al. Analysis on main controlling factors and comprehensive evaluation ofcoalbed methane production capacity of Junlian Block[J]. Coal Science and Technology,2017,45(9):194-200.
[18]张超,黄华州,徐德林,等.基于测井曲线的煤体结构判识[J].煤炭科学技术,2017,45(9):47-51.ZHANG Chao,HUANG Huazhou,XU Delin,et al.Coal structure identified based on logging curve[J].Coal Science and Technology,2017,45(9):47-51.
[19]蔚远江.准噶尔盆地低煤级煤储层及煤层气成藏初步研究[D].北京:中国地质大学(北京),2002.
[20]张群,桑树勋,钟玲文,等.煤层吸附特征及储气机理[M].北京:科学出版社,2010.
[2]王德利,李凤义,杨曙光.准南煤田煤储层和围岩对煤层气聚集的影响分析[J].中国煤层气,2013,10(2):7-11.WANG Deli,Li Fengyi,YANG Shuguang. The influence analysis of coal reservoir and surrounding rock on CBM accumulation in Zhunnan Coalfield[J].China Coalbed Methane,2013,10(2):7-11.
[3]张培河,刘钰辉,王正喜,等.基于生产数据分析的沁水盆地南部煤层气井产能控制地质因素研究[J].天然气地球科学,2011,2(5):909-914.ZHANG Peihe,LIU Yuhui,WANG Zhengxi,et al. Geological factors of production control of CBM well in South Qinshui Basin[J].Natural Gas Geoscience,2011,2(5):909-914.
[4]李臣臣,刘大锰,蔡益栋,等.新疆准南地区煤储层显微裂隙特征及矿物控因分析[J].煤炭科学技术,2015,43(12):144-151.LI Chenchen,LIU Dameng,CAI Yidong,et al. Analysis on microfracture characteristics and control action of mineral genesis of coal reservoir in south margin of Junggar Basin,Xinjiang[J].Coal Science and Technology 2015,43(12):144-151.
[5]李小彦,钟铃文,李瑞明,等.乌鲁木齐河东河西矿区煤层气储层特征[J].中国煤田地质,2003,15(5):19-21.LI Xiaoyan,ZHONG Lingwen,LI Ruiming,et al. Characteristics of coalbed methane reservoir in Hedong-Hexi Area,Urumqi[J].Coal Geology of China,2003,15(5):19-21.
[6]孙钦平,孙斌,孙粉锦,等.准噶尔盆地东南部低煤阶煤层气富集条件及主控因素[J].高校地质学报,2012,18(3):460-464.SUN Qinping,SUN Bin,SUN Fenjin,et al. Accumulation and geological controls of low-rank coalbed methane in southeastern Junggar Basin[J]. Geological Journal of China Universities,2012,18(3):460-464.
[7]王屿涛,谢姝,刘全艳,等.准噶尔盆地低阶煤煤层气资源及勘探潜力分析[J].新疆石油学院学报,2002,14(3):5-7.WANG Yutao,XIE Shu,LIU Quanyan,et al. Low-rank coalbed methane resources and exploration potential in Junggar Basin[J].Journal of Xinjiang Petroleum Institute,2002,14(3):5-7.
[8]尹淮新,谈红梅,坛俊颖,等.新疆低煤阶煤层气勘探选区评价标准的探讨[J].中国煤层气,2009,6(6):9-13.YIN Huaixin,TAN Hongmei,TAN Junying,et al. Discussion on criteria for evaluation of selected target areas in prospecting CBM in low-rank coal in Xingjiang[J]. China Coalbed Methane,2009,6(6):9-13.
[9]尹淮新.新疆阜康煤矿区煤层气资源勘探前景及开发建议[J].中国煤层气,2009,6(2):16-18.YIN Huaixin. Prospect of exploration of CBM resources in Fukang Coal Mining Area in Xinjiang and recommendations on its development[J]. China Coalbed Methane,2009,6(2):16-18.
[10]李忠权,陈更生,张寿庭.新疆准噶尔盆地南缘拉张伸展动力学环境的探讨[J].高校地质学报,1998,4(1):73-78.LI Zhongquan,CHEN Gengsheng,ZHANG Shouting. Discussion on the extensional dynamic setting in the south margin of Junggar Basin,Xinjiang,China[J].Geological Journal of China Universities,1998,4(1):73-78.
[11]崔思华,刘洪林,王勃,等.准噶尔盆地低煤级煤层气成藏地质特征[J].现代地质,2007,21(4):719-724.CUI Sihua,LIU Honglin,WANG Bo,et al. Trapping characteristics of coalbed methane in low-rank coal of Junggar Basin[J].Geoscience,2007,21(4):719-724.
[12]田继军,杨曙光.准噶尔盆地南缘下-中侏罗统层序地层格架与聚煤规律[J].煤炭学报,2011,36(1):58-64.TIAN Jijun,YANG Shuguang. Sequence strata and coal accumulation of lower and middle Jurassic formation from southern margin of zhunggar Basin[J]. Journal of China Coal Society,2011,36(1):58-64.
[13]林海飞,程博,李树刚,等.新疆阜康矿区煤层孔隙结构特征的氮吸附实验研究[J].西安科技大学学报,2015,35(6):721-726.LIN Haifei,CHENG Bo,LI Shugang,et al. Nitrogen adsorption experimental study on pore structure characteristics of coal seams in Xinjiang Fukang Mining Area[J]. Journal of Xi’an University of Science and Technology,2015,35(6):721-726.
[14]薛喜成,高雅翠.淮南煤田煤体结构分布特征及其控制因素探讨[J].西安科技大学学报,2006,26(2):193-195.XUE Xicheng,GAO Yacui. Distribution characteristics and controlling factors of coal in Huainan Coalfield[J]. Journal of Xi'an University of Science and Technology,2006,26(2):193-195.
[15]吕闰生,彭苏萍,徐延勇.含瓦斯煤体渗透率与煤体结构关系的实验[J].重庆大学学报,2012,35(7):114-118.LYU Runsheng,PENG Suping,XU Yanyong. Experiments on the relationship between permeability of gas-bearing coal and coal body structure[J]. Journal of Chongqing University,2012,35(7):114-118.
[16]郭红玉,苏现波,夏大平,等.煤储层渗透率与地质强度指标的关系研究及意义[J].煤炭学报,2010,35(8):1319-1322.GUO Hongyu,SU Xianbo,XIA Daping,et al. Relationship of the permeability and geological strength index(GSI)of coal reservoir and its significance[J]. Journal of China Coal Society 2010,35(8):1319-1322.
[17]王维旭,贺满江,王希友,等.筠连区块煤层气产能主控因素分析及综合评价[J].煤炭科学技术,2017,45(9):194-200.WANG Weixu,HE Manjiang,WANG Xiyou,et al. Analysis on main controlling factors and comprehensive evaluation ofcoalbed methane production capacity of Junlian Block[J]. Coal Science and Technology,2017,45(9):194-200.
[18]张超,黄华州,徐德林,等.基于测井曲线的煤体结构判识[J].煤炭科学技术,2017,45(9):47-51.ZHANG Chao,HUANG Huazhou,XU Delin,et al.Coal structure identified based on logging curve[J].Coal Science and Technology,2017,45(9):47-51.
[19]蔚远江.准噶尔盆地低煤级煤储层及煤层气成藏初步研究[D].北京:中国地质大学(北京),2002.
[20]张群,桑树勋,钟玲文,等.煤层吸附特征及储气机理[M].北京:科学出版社,2010.