六盘水地区杨梅树向斜煤层气地质特征与有利开发层段优选
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摘要
基于3口煤层气参数井实钻资料及煤岩样品测试数据,分析了六盘水地区杨梅树向斜煤层气地质特征,重新估算了区内煤层气地质资源量,优选了5个有利目标层段,并对杨煤参1井3个有利层段开展了分压合采试验,获得了良好的产气效果。研究表明:区内上二叠统龙潭组薄—中厚煤层群发育,可采煤层累积厚度大且以原生结构为主,煤层含气量、含气饱和度及临储比高,平均渗透率达0.229×10~(-3)μm~2,煤层气富集与开发条件好。结合参数井实测煤层含气性,重新估算区内煤层气地质资源量为365.97×10~8 m~3,可采资源量为208.64×10~8 m~3。综合影响煤层气富集与开发的各项关键参数,认为5~#、7~#、13~#、15~#、23~#为区内煤层气勘探开发有利层段。依据产层优质性与相近性组合原则,优选杨煤参1井5~#、7~#和13~#煤进行分压合采试验,煤层气井排采过程中套压显现早,压降漏斗扩展迅速,未表现出明显的层间干扰,充分发挥了多煤层合采的资源优势,获得了最高日产气量4 656m~3/d、稳定日产气量3 600m~3/d的良好产气效果,创西南地区煤层气直井单井日产气量和稳定产气量新高,实现了区域煤层气勘查重大突破。
Based on the drilling data and coal petrographic test data of three coalbed methane parameter wells,we analyzed the coalbed methane geological characteristic,re-estimated the coalbed methane geological resource and optimized five favorable target intervals of Yangmeishu syncline in Liupanshui area.Simultaneously,the separate pressure production test was performed in the three favorable intervals of Well Yangmeican 1,and finally the productive gas production effect was achieved.The results show that thin and medium-thickness coal seam groups in Longtan Formation of Upper Permian are developed in this area,the recoverable coal seams are dominated by primary structure and possess large accumulation thickness;the gas content,gas saturation and relative reservoir ratio are high enough,the average permeability is 0.229×10~(-3)μm~2,the condition of coalbed methane accumulation and development is favorable.Combined with the key parameters of coalbed methane enrichment and exploitation,5~#,7~#,13~#,15~# and 23~# are regarded as favorable intervals of coalbed methane exploration and development in this area.According to the combination principle of quality and similarity in production layer,we selected 5~#,7~# and 13~# coal seams of Well Yangmeican 1 to conduct separate pressure production test.During the drainage process,the casing pressure appeared early and the pressure drawdown distribution expanded rapidly,interlayer interference did not show in this process.The resource superiority of multi-layer commingled production is fully exerted;the favorable gas production effect of 4 656 m~3/d in maximum daily output and 3 600 m~3/d in steady daily output was acquired.This outcome creates new heights of single-well daily output and stable gas production of coalbed methane vertical well in southwest area,and achieves a major breakthrough of regional coalbed methane exploration.
Based on the drilling data and coal petrographic test data of three coalbed methane parameter wells,we analyzed the coalbed methane geological characteristic,re-estimated the coalbed methane geological resource and optimized five favorable target intervals of Yangmeishu syncline in Liupanshui area.Simultaneously,the separate pressure production test was performed in the three favorable intervals of Well Yangmeican 1,and finally the productive gas production effect was achieved.The results show that thin and medium-thickness coal seam groups in Longtan Formation of Upper Permian are developed in this area,the recoverable coal seams are dominated by primary structure and possess large accumulation thickness;the gas content,gas saturation and relative reservoir ratio are high enough,the average permeability is 0.229×10~(-3)μm~2,the condition of coalbed methane accumulation and development is favorable.Combined with the key parameters of coalbed methane enrichment and exploitation,5~#,7~#,13~#,15~# and 23~# are regarded as favorable intervals of coalbed methane exploration and development in this area.According to the combination principle of quality and similarity in production layer,we selected 5~#,7~# and 13~# coal seams of Well Yangmeican 1 to conduct separate pressure production test.During the drainage process,the casing pressure appeared early and the pressure drawdown distribution expanded rapidly,interlayer interference did not show in this process.The resource superiority of multi-layer commingled production is fully exerted;the favorable gas production effect of 4 656 m~3/d in maximum daily output and 3 600 m~3/d in steady daily output was acquired.This outcome creates new heights of single-well daily output and stable gas production of coalbed methane vertical well in southwest area,and achieves a major breakthrough of regional coalbed methane exploration.
引文
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[13]Wang Wanhong,Zheng Yuzhu.Analysis of adaptation conditions for CBM separate layer fracturing and multi-layer drainage technologies:A case study of Wubu mining area[J].Coal Geology&Exlortion,2014,42(4):36-38.汪万红,郑玉柱.煤层气分压合排技术适应条件分析[J].煤田地质与勘探,2014,42(4):36-38.
[14]Peng Longshi,Qiao Lan,Gong Min,et al.Factors affecting the roduction performance of coalbed methane wells with multiplezone[J].Journal of China Coal Society,2014,39(10):2060-2067.彭龙仕,乔兰,龚敏,等.煤层气井多层合采产能影响因素[J].煤炭学报,2014,39(10):2060-2067.
[15]Ao Xianshu,Cao Liwen,Jia Jinlong,et al.Study on optimization method of coalbed methane commingled development layer section in Songhe mine field,west Guizhou[J].Coal Science and Technology,2016,44(2):68-72.敖显书,曹丽文,贾金龙,等.黔西松河井田煤层气合层开发层段优选方法研究[J].煤炭科学技术,2016,44(2):68-72.
[16]Zhou Xiaozhi,Sang Shuxun,Yi Tongsheng,et al.Damage mechanism of upper exposed producing layers during CBM multi-coal seam development[J].Natural Gas Industry,2016,36(6):52-59.周效志,桑树勋,易同生,等.煤层气合层开发上部产层暴露的伤害机理[J].天然气工业,2016,36(6):52-59.
[2]Cui Yuchao,Teng Zijun,Wang Huaihong,et al.Distribution,development and utilization of CBM from Loangchang Coal mine in Qianxi county,Guizhou Province[J].Natural Gas Geoscience,2011,22(2):367-372.崔玉朝,滕子军,王怀洪,等.贵州黔西龙场煤矿煤层气资源及开发利用价值[J].天然气地球科学,2011,22(2):367-372.
[3]Qin Yong,Gao Di,Wu Caifang,et al.The Potential and Evalulation of Coalbed Methane in Guizhou Province[M].Xuzhou:China of University Mining and Technology Press,2012:150-192.秦勇,高弟,吴财芳,等.贵州省煤层气资源潜力预测与评价[M].徐州:中国矿业大学出版社,2012:150-192.
[4]Guo Chen,Xia Yucheng,Lu Lingling,et al.Development features and mechanism of multilayer superimposed independent CBM systems in Bide-Santang Basin,western Guizhou,south China[J].Natural Gas Geoscience,2017,28(4):622-632.郭晨,夏玉成,卢玲玲,等.黔西比德—三塘盆地多层叠置独立含煤层气系统发育规律与控制机理[J].天然气地球科学,2017,28(4):622-632.
[5]Gui Baolin.Geological characteris and enrichment controlling factors of coalbed methane in Liupanshui region[J].Acta Petrolei Sinica,1999,20(3):31-37.桂宝林.六盘水地区煤层气地质特征及富集高产控制因素[J].石油学报,1999,20(3):31-37.
[6]Xu Fang,Guo Lijun,Hu Haibo,et al.Sequence stratigraphy and sedimentary environment of the Upper Permian in Liupanshui Coalfield of Guizhou[J].Journal of Beijing Polytechnic College,2012,2(11):7-13.徐方,郭立君,胡海博,等.贵州六盘水煤田上二叠统沉积环境与层序地层研究[J].北京工业职业技术学院学报,2012,2(11):7-13.
[7]Gao Di,Qin Yong,Yi Tongsheng.Geological condition,exploration and exploitation strategy of coalbed methane resources in Guizhou,China[J].Coal Gelogy of China,2009,21(3):20-23.高弟,秦勇,易同生.论贵州煤层气地质特点与勘探开发战略[J].中国煤炭地质,2009,21(3):20-23.
[8]Xiong Menghui,Qin Yong,Yi Tongsheng.Sedimentary patterns and structural controls of Late Permian coal-bearing strata in Guizhou,China[J].Journal of China University of Mining and Technology,2006,35(6):778-782.熊孟辉,秦勇,易同生.贵州晚二叠世含煤地层沉积格局及其构造控制[J].中国矿业大学学报,2006,35(6):778-782.
[9]Luo Desheng.Coal-forming environments of Late Permian Coal-Bearing strata in Guizhou[J].Coal of China,2000,26(9):2-24.罗德生.贵州省晚二世含煤建造成煤环境的研究[J].中国煤炭,2000,26(9):2-24.
[10]Xu Binbin,He Mingde.Coal Field Geology in Guizhou Province[M].Xuzhou:China University of Mining and Technology Press,2003.徐彬彬,何明德.贵州煤田地质[M].徐州:中国矿业大学出版社,2003.
[11]Liu Yijun,Zeng Xiangzhou,Hu Gang,et al.Characteristics and technical measures of exploration and development of coalbed methane reservoir in Guizhou Province:A case of Bide-Santang area[J].Coal Geology&Exploration,2017,45(1):71-74.刘贻军,曾祥洲,胡刚,等.贵州煤层气储层特征及勘探开发技术对策——以比德—三塘盆地为例[J].煤田地质与勘探,2017,45(1)71-74.
[12]Luo Kaiyan,Jin Jun,Zhao Lingyun,et al.Feasibility study on combined seam gas drainage under condition of seam group in Songhe mine field[J].Coal Science and Technology,2016,44(2):73-77,103.罗开艳,金军,赵凌云,等.松河井田煤层群条件下合层排采煤层气可行性研究[J].煤炭科学技术,2016,44(2):73-77,103.
[13]Wang Wanhong,Zheng Yuzhu.Analysis of adaptation conditions for CBM separate layer fracturing and multi-layer drainage technologies:A case study of Wubu mining area[J].Coal Geology&Exlortion,2014,42(4):36-38.汪万红,郑玉柱.煤层气分压合排技术适应条件分析[J].煤田地质与勘探,2014,42(4):36-38.
[14]Peng Longshi,Qiao Lan,Gong Min,et al.Factors affecting the roduction performance of coalbed methane wells with multiplezone[J].Journal of China Coal Society,2014,39(10):2060-2067.彭龙仕,乔兰,龚敏,等.煤层气井多层合采产能影响因素[J].煤炭学报,2014,39(10):2060-2067.
[15]Ao Xianshu,Cao Liwen,Jia Jinlong,et al.Study on optimization method of coalbed methane commingled development layer section in Songhe mine field,west Guizhou[J].Coal Science and Technology,2016,44(2):68-72.敖显书,曹丽文,贾金龙,等.黔西松河井田煤层气合层开发层段优选方法研究[J].煤炭科学技术,2016,44(2):68-72.
[16]Zhou Xiaozhi,Sang Shuxun,Yi Tongsheng,et al.Damage mechanism of upper exposed producing layers during CBM multi-coal seam development[J].Natural Gas Industry,2016,36(6):52-59.周效志,桑树勋,易同生,等.煤层气合层开发上部产层暴露的伤害机理[J].天然气工业,2016,36(6):52-59.