海拉尔盆地旧桥凹陷低煤阶煤层气资源潜力分析
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摘要
海拉尔盆地旧桥凹陷是典型的低煤阶区,煤层气勘探程度较低,缺乏煤层气地质和资源潜力的相关研究。基于煤层气参数井地质和实验测试资料,并结合国内外低煤阶区相关研究,对旧桥凹陷煤层的厚度、含气量和等温吸附特征进行了对比分析,估算了该凹陷煤层气的资源丰度、理论采收率和单井最终可采储量,提出了未来煤层气勘探建议。研究表明:旧桥凹陷煤系伊敏组和大磨拐河组发育多套厚煤层,但因煤层生气和吸附能力有限,平均含气量仅为0. 00～3. 23 m~3/t,单煤层的资源丰度不满足煤层气单层开发的需求;相比之下,多煤层累计资源丰度较高,在煤层气理论采收率超过60%的情况下,单井开采尽可能多的厚煤层,仍然具有较高的最终可采储量和经济效益,资源潜力较大;旧桥凹陷未来煤层气勘探的重点在于地下水活跃的潜在次生生物气富集区和煤层埋深较大、气体保存条件较好的地区。研究结果对于旧桥凹陷煤层气开发具有一定的指导意义。
Jiuqiao sag in the Hailar Basin is a typical low coal rank area with low exploration maturity and lack of relevant research on coalbed methane geology and resource potential. Based on the geological and experimental data of coalbed methane parameter wells,combined with the relative research of low coal rank areas at home and abroad,the thickness,gas content and isothermal adsorption characteristics of coal beds in Jiuqiao sag were compared and analyzed,the resource abundance and theoretical recovery factor of coalbed methane as well as ultimate recoverable reserves of single well in the sag were estimated,and the future coalbed methane exploration proposals were put forward. The study results show that several sets of thick coals are developed in Yinmin Formation and Damoguaihe Formation of coal series in Jiuqiao sag,but the average gas content is only 0.00-3.23 m~3/t due to the limited gas generation and adsorption capacity of the coal beds,the resource abundance of single coal bed does not meet the single layer development demand of coalbed methane; in contrast,the accumulative resource abundance of multiple coal beds is high,when the theoretical recovery factor of coalbed methane exceeds 60%,and the single well exploits as many thick coal beds as possible,it still has higher ultimate recoverable reserves and economic benefits,and the resource potential is large; the key points of future coalbed methane exploration in Jiuqiao sag are the potential secondary biogas enrichment areas where groundwater is active and the areas where the coal bed is buried deeply and the gas preservation conditions are better. The study results are very instructive in the development of coal bed methane in Jiuqiao sag.
Jiuqiao sag in the Hailar Basin is a typical low coal rank area with low exploration maturity and lack of relevant research on coalbed methane geology and resource potential. Based on the geological and experimental data of coalbed methane parameter wells,combined with the relative research of low coal rank areas at home and abroad,the thickness,gas content and isothermal adsorption characteristics of coal beds in Jiuqiao sag were compared and analyzed,the resource abundance and theoretical recovery factor of coalbed methane as well as ultimate recoverable reserves of single well in the sag were estimated,and the future coalbed methane exploration proposals were put forward. The study results show that several sets of thick coals are developed in Yinmin Formation and Damoguaihe Formation of coal series in Jiuqiao sag,but the average gas content is only 0.00-3.23 m~3/t due to the limited gas generation and adsorption capacity of the coal beds,the resource abundance of single coal bed does not meet the single layer development demand of coalbed methane; in contrast,the accumulative resource abundance of multiple coal beds is high,when the theoretical recovery factor of coalbed methane exceeds 60%,and the single well exploits as many thick coal beds as possible,it still has higher ultimate recoverable reserves and economic benefits,and the resource potential is large; the key points of future coalbed methane exploration in Jiuqiao sag are the potential secondary biogas enrichment areas where groundwater is active and the areas where the coal bed is buried deeply and the gas preservation conditions are better. The study results are very instructive in the development of coal bed methane in Jiuqiao sag.
引文
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[12]孙斌,邵龙义,赵庆波,等.二连盆地煤层气勘探目标评价[J].煤田地质与勘探,2008,36(1):22-26.
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[15]康永尚,王金,姜杉钰,等.量化指标在煤层气开发潜力定量评价中的应用[J].石油学报2017,38(6):18-25.
[16]张群,杨锡禄.平衡水分条件下煤对甲烷的等温吸附特性研究[J].煤炭学报,1999,24(6):566-570.
[17]王金,康永尚,姜杉钰,等.沁水盆地寿阳区块和柿庄区块煤层气开发条件对比[J].煤田地质与勘探,2017,45(4):56-62.
[18]李五忠,田文广,陈刚.等.不同煤阶煤层气选区评价参数的研究与应用[J].天然气工业,2010,30(6):45-47,63.
[19]员争荣,韩玉芹,李建武,等.中外低煤阶盆地煤层气成藏及资源开发潜力对比分析---以中国吐哈盆地和保德河盆地为例[J].煤田地质与勘探,2003,31(5):27-29.
[20]张群,降文萍.我国低煤阶煤层气地面开发产气潜力研究[J].煤炭科学技术,2016,44(6):211-215.
[21]刘刚,孙建博,尹锦涛.改造瑞利模型在沁水煤层气产量预测中的应用[J].特种油气藏,2017,24(2):145-148.
[22]RICE C A,FLORES R M,STRICKER G D,et al.Chemical and stable isotopic evidence for water/rock interaction and biogenic origin of coalbed methane,Fort Union Formation,Powder River basin,Wyoming and Montana USA[J].International Journal of Coal Geology,2008,76(1/2):76-85.
[23]孙斌,孙粉锦,陈刚,等.潮水盆地红沙岗地区低煤阶煤层气勘探前景[J].天然气工业,2010,20(11):17-21.
[2]叶建平,陆小霞.我国煤层气产业发展现状和技术进展[J].煤炭科学技术,2016,44(1):24-28.
[3]许婷,伏海蛟,马英哲,等.准噶尔盆地东南缘煤层气勘探目标优选[J].特种油气藏,2017,24(2):18-23.
[4]孙粉锦,李五忠,孙钦平,等.二连盆地吉尔嘎朗图凹陷低煤阶煤层气勘探[J].石油学报,2017,38(5):485-492.
[5]卢双舫,申家年,王振平,等.海拉尔盆地煤层气资源评价及潜力分析[J].煤田地质与勘探,2003,31(6):28-31.
[6]孙斌,邵龙义,赵庆波,等.海拉尔盆地煤层气成藏机理及勘探方向[J].天然气工业,2007,27(7):12-15,130.
[7]杨子荣,张艳飞,姚远.海拉尔盆地呼和湖凹陷煤层气资源潜力分析[J].煤田地质与勘探,2008,36(2):15-18.
[8]谢春临,关晓巍,张广颖,等.海拉尔盆地呼和湖凹陷煤层气预测方法[J].石油地球物理勘探,2013,48(增刊1):58-63.
[9]王培俊,钟建华,牛永斌.海拉尔盆地呼和湖凹陷构造特征与演化[J].特种油气藏,2009,16(5):25-27,105.
[10]郭万良,池海,牛丽.红花尔基含煤盆地沉积环境分析[J].西部资源,2011,38(6):36-37.
[11]王帅,邵龙义,孙钦平,等.二连盆地吉尔嘎郎图凹陷煤层气储层特征及勘探潜力[J].煤田地质与勘探,2017,45(4):63-69.
[12]孙斌,邵龙义,赵庆波,等.二连盆地煤层气勘探目标评价[J].煤田地质与勘探,2008,36(1):22-26.
[13]傅雪海,张万红,范炳恒,等.吐哈盆地与粉河盆地煤储层物性对比分析[J].天然气工业,2005,25(4):38-39.
[14]康永尚,姜杉钰,张兵等.煤层气资源可动用性定性/半定量评价方法研究[J].煤炭学报,2017,42(11):2914-2924.
[15]康永尚,王金,姜杉钰,等.量化指标在煤层气开发潜力定量评价中的应用[J].石油学报2017,38(6):18-25.
[16]张群,杨锡禄.平衡水分条件下煤对甲烷的等温吸附特性研究[J].煤炭学报,1999,24(6):566-570.
[17]王金,康永尚,姜杉钰,等.沁水盆地寿阳区块和柿庄区块煤层气开发条件对比[J].煤田地质与勘探,2017,45(4):56-62.
[18]李五忠,田文广,陈刚.等.不同煤阶煤层气选区评价参数的研究与应用[J].天然气工业,2010,30(6):45-47,63.
[19]员争荣,韩玉芹,李建武,等.中外低煤阶盆地煤层气成藏及资源开发潜力对比分析---以中国吐哈盆地和保德河盆地为例[J].煤田地质与勘探,2003,31(5):27-29.
[20]张群,降文萍.我国低煤阶煤层气地面开发产气潜力研究[J].煤炭科学技术,2016,44(6):211-215.
[21]刘刚,孙建博,尹锦涛.改造瑞利模型在沁水煤层气产量预测中的应用[J].特种油气藏,2017,24(2):145-148.
[22]RICE C A,FLORES R M,STRICKER G D,et al.Chemical and stable isotopic evidence for water/rock interaction and biogenic origin of coalbed methane,Fort Union Formation,Powder River basin,Wyoming and Montana USA[J].International Journal of Coal Geology,2008,76(1/2):76-85.
[23]孙斌,孙粉锦,陈刚,等.潮水盆地红沙岗地区低煤阶煤层气勘探前景[J].天然气工业,2010,20(11):17-21.
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