鄂尔多斯盆地神府地区中低阶煤层气勘探潜力分析
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摘要
为了分析鄂尔多斯盆地东缘神木-府谷地区中低阶煤层气的勘探潜力,通过煤岩工业分析,显微组分、Ro,max、热模拟等试验数据的统计、对比,发现8+9号煤生烃能力强于4+5号煤;通过解吸试验可知,研究区东部抬升区煤层气含量低,以吸附气为主,且由于煤层及地下水条件不利于生物气生成,勘探潜力不足;而西部地层缓坡区,特别是背斜发育区,由于中低煤阶煤孔渗相对发育,游离气含量增高,甚至可能超过吸附气。高煤阶煤储层→低煤阶煤储层→常规气藏储层,其含气形式存在以吸附气→吸附气、游离气→游离气为主的变化规律,结合其他煤层气赋存条件,"构造高点"或圈闭是该地区煤层气勘探的有利方向。
In order to analyze the exploration potential of mid-low rank coalbed methane in Shenmu-Fugu Area at east edge of Ordos Basin,though coal and rock proximate analysis,maceral,Ro,max,heat simulation and other experimental data statistics and contrastive,it was found that the hydrocarbon generation capacity of No. 8 + 9 seam was higher than No. 4 + 5 seam. The result of desorption experiments showed that,the coalbed methane content of upraised area at east part of study area was low and was adsorption gas mainly due to the seam and underground water conditions were not suitable to biogas generation and the exploration potential was insufficient. The strata in west of the area were in gentle slope area. Especially in anticline development area,due to the pore permeability of medium and mid-low rank coal relatively developed,free gas content could be increased and could be over the adsorption gas. Based on high rank coal reservoir → low rank coal reservoir → normal gas formation reservoir,and the gas-bearing variation law was adsorbed gas → adsorbed gas and free gas → free gas,in combination with other coalbed methane deposition conditions,the " structure highs" or trap would be favorable direction to coalbed methane exploration in the area.
In order to analyze the exploration potential of mid-low rank coalbed methane in Shenmu-Fugu Area at east edge of Ordos Basin,though coal and rock proximate analysis,maceral,Ro,max,heat simulation and other experimental data statistics and contrastive,it was found that the hydrocarbon generation capacity of No. 8 + 9 seam was higher than No. 4 + 5 seam. The result of desorption experiments showed that,the coalbed methane content of upraised area at east part of study area was low and was adsorption gas mainly due to the seam and underground water conditions were not suitable to biogas generation and the exploration potential was insufficient. The strata in west of the area were in gentle slope area. Especially in anticline development area,due to the pore permeability of medium and mid-low rank coal relatively developed,free gas content could be increased and could be over the adsorption gas. Based on high rank coal reservoir → low rank coal reservoir → normal gas formation reservoir,and the gas-bearing variation law was adsorbed gas → adsorbed gas and free gas → free gas,in combination with other coalbed methane deposition conditions,the " structure highs" or trap would be favorable direction to coalbed methane exploration in the area.
引文
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[13]刘大锰,杨起,汤达祯.鄂尔多斯盆地煤成烃潜力与成气热模拟实验[J].现代地质,1997,11(3):322-329.Liu Dameng,Yangqi,Tang Dazhen.Coal-derived hydrocarbon potential and thermal stimulating experiment on coal-derived gas from Ordos Basin[J].Geoscience,1997,11(3):322-329.
[14]敖卫华,黄文辉,姚艳斌.鄂尔多斯盆地北部煤系有机显微组分特征与生烃潜力[J].吉林大学学报:地球科学版,2011,41(S1):91-97.Ao Weihua,Huang Wenhui,Yao Yanbin.Macerals’characteristics and hydrocarbon generation potential of coal-bearing seris in the northern Ordos basin[J].Journal of Jilin University:Earth Science Edition,2011,41(S1):91-97.
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[16]刘爱华,傅雪海,梁文庆,等.不同煤阶煤孔隙分布特征及对煤层气开发的影响[J].煤炭科学技术,2013,41(4):104-108.Liu Aihua,Fu Xuehai,Liang Wenqing,et al.Pore distribution features of different rank coal and influences to coal bed methane development[J].Coal Science and Technology,2013,41(4):104-108.
[17]傅雪海,邢雪,刘爱华,等.华北地区各类煤储层孔隙、吸附特征及试井成果分析[J].天然气工业,2011,31(12):72-75.Fu Xuehai,Xing Xue,Liu Aihua,et al.Analysis of porosity,adsorption characteristics and well test results of coal beds with different ranks in North China[J].Natural Gas Industry,2011,31(12):72-75.
[18]戚灵灵,王兆丰,杨宏民,等.基于低温氮吸附法和压汞法的煤样孔隙研究[J].煤炭科学技术,2012,40(8):36-39.Qi Lingling,Wang Zhaofeng,Yang Hongmin,et al.Study on porosity of coal samples based on low temperature nitrogen adsorption method and mercury porosimetry[J].Coal Science and Technology,2012,40(8):36-39.
[19]周龙刚,吴财芳.黔西比德-三塘盆地主采煤层孔隙特征[J].煤炭学报,2012,37(12):1878-1884.Zhou Longgang,Wu Caifang.Pore characteristics of the main coal seams in Bide-Santang Basin in western Guizhou Province[J].Journal of China Coal Society,2012,37(12):1878-1884.
[20]申建,杜磊,秦勇,等.深部低煤阶三相态含气量建模及勘探启示[J].天然气工业,2014,35(3):1-6.Shen Jian,Du Lei,Qin Yong,et al.Three-phase gas content model of deep low-rank coals and its implication for CBM exploration:A case study from the Jurassic coal in the Junggar Basin[J].Natural Gas Industry,2014,35(3):1-6.
[21]田文广,邵龙义,孙斌,等.保德地区煤层气井产出水化学特征及其控气作用[J].天然气工业,2014,34(8):15-19.Tian Wenguang,Shao Longyi,Sun Bin,et al.Chemical behaviors of produced water from CBM wells in the Baode area,Shanxi,China,and their control on gas accumulation[J].Natural Gas Industry,2014,34(8):15-19.
[22]李金平,汤达祯,许浩,等.低煤阶煤层气井抽采特征及影响因素分析[J].煤炭科学技术,2013,41(12):53-56.Li Jinping,Tang Dazhen,Xu Hao,et al.Analysis on gas drainage features and influence factors of low rank coalbed methane well[J].Coal Science and Technology,2013,41(12):53-56.
[2]张先敏,冯其红,汪旭升,等.低煤阶煤层气藏物质平衡方程建立及应用[J].天然气地球科学,2013,24(6):1311-1315.Zhang Xianmin,Feng Qihong,Wang Xusheng,et al.Establishment and application of material balance equations for low-rank coalbed methane reservoirs[J].Natural Gas Geosciences,2013,24(6):1311-1315.
[3]雷怀玉,孙钦平,孙斌,等.二连盆地霍林河地区低煤阶煤层气成藏条件及主控因素[J].天然气工业,2010,30(6):26-30.Lei Huaiyu,Sun Qinping,Sun Bin,et al.Conditions and major controllong factors of coalbed methane accumulation in coal reservoirs with low coal rank in the Huolinhe area,Erlian basin[J].Natural Gas Industry,2010,30(6):26-30.
[4]李志军,李新宁,梁辉,等.吐哈和三塘湖盆地水文地质条件对低煤阶煤层气的影响[J].新疆石油地质,2013,34(2):158-161.Li Zhijun,Li Xinning,Liang Hui,et al.Effect of hydrogeological conditions on low-rank coalbed methane in Tuha basin and Santanghu Basins[J].Xinjiang Petroleum Geology,2013,34(2):158-161.
[5]叶欣,陈纯芳,姜文利,等.我国低煤阶煤层气地质特征及最新进展[J].煤炭科学技术,2009,37(8):111-115.Ye Xin,Chen Chunfang,Jiang Wenli,et al.Geological characteristics and new development progress of low rank seam coal bed methane in China[J].Coal Science and Technology,2009,37(8):111-115.
[6]秦勇,袁亮,胡千庭,等.我国煤层气勘探与开发技术现状及发展方向[J].煤炭科学技术,2012,40(10):1-6.Qin Yong,Yuan Liang,Hu Qianting,et al.Status and development orientation of coal bed methane exploration and development technology in China[J].Coal Science and Technology,2012,40(10):1-6.
[7]季伟,吴国光,孟献梁,等.神府煤孔隙特征及活性结构对自燃的影响研究[J].煤炭技术,2011,30(4):87-89.Ji Wei,Wu Guoguang,Meng Xianliang,et al.Effect of Shenfu coal pore characteristic and active structure on spontaneous combustion[J].Coal Technology,2011,30(4):87-89.
[8]彭少涛,刘川庆,朱卫平,等.保德区块中低阶煤压裂存在的问题及技术对策[C]//2011年煤层气学术研讨会论文集-中国煤层气技术进展.北京:地质出版社,2011:303-309.
[9]屈晓荣.河东煤田杨家湾勘查区主煤储层特征分析及意义[J].中国煤炭地质,2012,24(11):29-29.Qu Xiaorong.Main coal reservoir characteristic analysis and its significance[J].Coal Geology of China,2012,24(11):29-29.
[10]张文正,徐正球.低阶煤热演化生烃的模拟试验研究[J].天然气工业,1986,6(2):1-7.Zhang Wenzheng,Xu Zhengqiu.Modeling experimental research of hydrocarbon generation from the thermal evolution of low grade coal[J].Natural Gas Industry,1986,6(2):1-7.
[11]汤达祯,王激流,张君峰,等.鄂尔多斯盆地东缘煤的二次生烃作用与煤层气的富集[J].石油实验地质,2000,22(2):140-145.Tang Dazhen,Wang Jiliu,Zhang Junfeng,et al.Secondary hydrocarbon generation of coal and accumulation of coalbed methane in the east margin of the Ordos Basin[J].Experimental Petroleum Geology,2000,22(2):140-145.
[12]李小彦,司胜利.鄂尔多斯盆地煤的热解生烃潜力与成烃母质[J].煤田地质与勘探,2008,36(3):1-11.Li Xiaoyan,Si Shengli.The hydrocarbon potential and precursor types of coal pyrogenation in Ordos Basin[J].Coal Geology&Exploration,2008,36(3):1-11.
[13]刘大锰,杨起,汤达祯.鄂尔多斯盆地煤成烃潜力与成气热模拟实验[J].现代地质,1997,11(3):322-329.Liu Dameng,Yangqi,Tang Dazhen.Coal-derived hydrocarbon potential and thermal stimulating experiment on coal-derived gas from Ordos Basin[J].Geoscience,1997,11(3):322-329.
[14]敖卫华,黄文辉,姚艳斌.鄂尔多斯盆地北部煤系有机显微组分特征与生烃潜力[J].吉林大学学报:地球科学版,2011,41(S1):91-97.Ao Weihua,Huang Wenhui,Yao Yanbin.Macerals’characteristics and hydrocarbon generation potential of coal-bearing seris in the northern Ordos basin[J].Journal of Jilin University:Earth Science Edition,2011,41(S1):91-97.
[15]王可新.低煤阶储层三相态含气量物理模拟与数值模拟研究[D].徐州:中国矿业大学,2010:72-73.Wang Kexin.Physical simulation and numerical simulation of adsorbed state,solubel state and free state gas volume in low rank coal reservoir[D].Xuzhou:China University of Mining&Technology,2010:72-73.
[16]刘爱华,傅雪海,梁文庆,等.不同煤阶煤孔隙分布特征及对煤层气开发的影响[J].煤炭科学技术,2013,41(4):104-108.Liu Aihua,Fu Xuehai,Liang Wenqing,et al.Pore distribution features of different rank coal and influences to coal bed methane development[J].Coal Science and Technology,2013,41(4):104-108.
[17]傅雪海,邢雪,刘爱华,等.华北地区各类煤储层孔隙、吸附特征及试井成果分析[J].天然气工业,2011,31(12):72-75.Fu Xuehai,Xing Xue,Liu Aihua,et al.Analysis of porosity,adsorption characteristics and well test results of coal beds with different ranks in North China[J].Natural Gas Industry,2011,31(12):72-75.
[18]戚灵灵,王兆丰,杨宏民,等.基于低温氮吸附法和压汞法的煤样孔隙研究[J].煤炭科学技术,2012,40(8):36-39.Qi Lingling,Wang Zhaofeng,Yang Hongmin,et al.Study on porosity of coal samples based on low temperature nitrogen adsorption method and mercury porosimetry[J].Coal Science and Technology,2012,40(8):36-39.
[19]周龙刚,吴财芳.黔西比德-三塘盆地主采煤层孔隙特征[J].煤炭学报,2012,37(12):1878-1884.Zhou Longgang,Wu Caifang.Pore characteristics of the main coal seams in Bide-Santang Basin in western Guizhou Province[J].Journal of China Coal Society,2012,37(12):1878-1884.
[20]申建,杜磊,秦勇,等.深部低煤阶三相态含气量建模及勘探启示[J].天然气工业,2014,35(3):1-6.Shen Jian,Du Lei,Qin Yong,et al.Three-phase gas content model of deep low-rank coals and its implication for CBM exploration:A case study from the Jurassic coal in the Junggar Basin[J].Natural Gas Industry,2014,35(3):1-6.
[21]田文广,邵龙义,孙斌,等.保德地区煤层气井产出水化学特征及其控气作用[J].天然气工业,2014,34(8):15-19.Tian Wenguang,Shao Longyi,Sun Bin,et al.Chemical behaviors of produced water from CBM wells in the Baode area,Shanxi,China,and their control on gas accumulation[J].Natural Gas Industry,2014,34(8):15-19.
[22]李金平,汤达祯,许浩,等.低煤阶煤层气井抽采特征及影响因素分析[J].煤炭科学技术,2013,41(12):53-56.Li Jinping,Tang Dazhen,Xu Hao,et al.Analysis on gas drainage features and influence factors of low rank coalbed methane well[J].Coal Science and Technology,2013,41(12):53-56.