Development unit division and favorable area evaluation for joint mining coalbed methane
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摘要
Based on the productivity equation of coalbed methane(CBM) well, considering the impact of coal reservoir reformability on gas well productivity, the main production layer optimization index in the "three-step method" of optimal combination of production layers is corrected, and then the CBM production layer potential index is introduced to evaluate favorable areas for commingled multi-coal seam production. Through analysis of the key parameters of coal reservoirs affecting the CBM productivity index, a development unit division method for areas with multi-coal seams is established, and a quantitative grading index system is proposed. On this basis, the evaluation process of CBM development favorable area is developed: the mature 3-D modeling technology is used to characterize the reservoir physical properties of multi-coal seams in full-scale; the production layer potential index of each grid is calculated, and the production layer potential index contour under single-layer or commingled multi-layer production are plotted; according to the distribution of the contour of production layer potential index, the quantitative index of CBM development unit is adopted to outline the grade I, II, III coal reservoir distribution areas, and thus to pick out the favorable development areas. The practical application in the Yuwang block of Laochang in Yunnan proved that the favorable area evaluation process proposed can effectively overcome the defects of selecting favorable development areas only relying on evaluation results of a major coal seam pay, and enhance the accuracy of the evaluation results,meeting the requirements of selecting favorable areas for multi-coal seam commingled CBM production.
Based on the productivity equation of coalbed methane(CBM) well, considering the impact of coal reservoir reformability on gas well productivity, the main production layer optimization index in the "three-step method" of optimal combination of production layers is corrected, and then the CBM production layer potential index is introduced to evaluate favorable areas for commingled multi-coal seam production. Through analysis of the key parameters of coal reservoirs affecting the CBM productivity index, a development unit division method for areas with multi-coal seams is established, and a quantitative grading index system is proposed. On this basis, the evaluation process of CBM development favorable area is developed: the mature 3-D modeling technology is used to characterize the reservoir physical properties of multi-coal seams in full-scale; the production layer potential index of each grid is calculated, and the production layer potential index contour under single-layer or commingled multi-layer production are plotted; according to the distribution of the contour of production layer potential index, the quantitative index of CBM development unit is adopted to outline the grade I, II, III coal reservoir distribution areas, and thus to pick out the favorable development areas. The practical application in the Yuwang block of Laochang in Yunnan proved that the favorable area evaluation process proposed can effectively overcome the defects of selecting favorable development areas only relying on evaluation results of a major coal seam pay, and enhance the accuracy of the evaluation results,meeting the requirements of selecting favorable areas for multi-coal seam commingled CBM production.
Based on the productivity equation of coalbed methane(CBM) well, considering the impact of coal reservoir reformability on gas well productivity, the main production layer optimization index in the "three-step method" of optimal combination of production layers is corrected, and then the CBM production layer potential index is introduced to evaluate favorable areas for commingled multi-coal seam production. Through analysis of the key parameters of coal reservoirs affecting the CBM productivity index, a development unit division method for areas with multi-coal seams is established, and a quantitative grading index system is proposed. On this basis, the evaluation process of CBM development favorable area is developed: the mature 3-D modeling technology is used to characterize the reservoir physical properties of multi-coal seams in full-scale; the production layer potential index of each grid is calculated, and the production layer potential index contour under single-layer or commingled multi-layer production are plotted; according to the distribution of the contour of production layer potential index, the quantitative index of CBM development unit is adopted to outline the grade I, II, III coal reservoir distribution areas, and thus to pick out the favorable development areas. The practical application in the Yuwang block of Laochang in Yunnan proved that the favorable area evaluation process proposed can effectively overcome the defects of selecting favorable development areas only relying on evaluation results of a major coal seam pay, and enhance the accuracy of the evaluation results,meeting the requirements of selecting favorable areas for multi-coal seam commingled CBM production.
引文
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[2]GAO Di,QIN Yong,YI Tongsheng.Geological condition,exploration and exploitation strategy of coal-bed methane resources in Guizhou,China.Coal Geology of China,2009,21(3):20-23.
[3]WU Caifang,LIU Xiaolei,ZHANG Shasha.Construction of index system of“Hierarchical progressive”geological selection of coalbed methane in multiple seam area of eastern Yunnan and western Guizhou.Journal of China Coal Society,2018,43(6):1647-1653.
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[13]RICKMAN R,MULLEN M,PETRE J,et al.A practical use of shale petrophysics for stimulation design optimization:All shale plays are not clones of the Barnett shale.SPE 115258,2008.
[14]TAO S,TANG D Z,XU H,et al.Factors controlling highyield coalbed methane vertical wells in the Fanzhuang Block,Southern Qinshui Basin.International Journal of Coal Geology,2014,134:38-45.
[15]ZHOU Ying.Introduction to coal mining.Beijing:Coal Industry Press,2006.
[16]The National Standardization Administration of China.Technical specifications of coalbed methane resources exploration:GP/T 29119-2012.Beijing:China Standard Publishing House,2012.
[17]ZHAO Xianzheng,YANG Yanhui,SUN Fenjin,et al.Enrichment mechanism and exploration and development technologies of high rank coalbed methane in South Qinshui Basin,Shanxi Province.Petroleum Exploration and Development,2016,43(2):303-309.
[18]ZHAO Xin,JIANG Bo,XU Qiang,et al.Well pattern design and deployment for coalbed methane development.Petroleum Exploration and Development,2016,43(1):84-90.
[19]SONG Yan,LI Zhuo,JIANG Zhenxue,et al.Progress and development trend of unconventional oil and gas geological research.Petroleum Exploration and Development,2017,44(4):638-648.
[20]The Ministry of Land and Resources of China.Specifications for coalbed methane resources/reserves:DZ/T 0216-2010.Beijing:China Standard Publishing House,2011.
[21]XIONG Bin.Analysis on geological factors of single CBMwell productivity in Zhijin block.Reservoir Evaluation and Development,2014,4(4):58-62.
[22]SHAN Yansheng,BI Caiqin,CHI Huanpeng,et al.Geologcial characteristics of coalbed methane and optimization for favorable productive intervals of Yangmeishu syncline in Liupanshui area.Natural Gas Geoscience,2018,29(1):122-129.
[23]LI Wuzhong,TIAN Wenguang,CHEN Gang,et al.Research and application of appraisal variables for the prioritizing of coalbed methane area featured by different coal ranks.Natural Gas Industry,2010,30(6):45-47.
[24]FU Xuehai,QIN Yong,WEI Chongtao.Coalbed methane geology.Xuzhou:China University of Mining and Technology Press,2007.
[25]XIAO Gang,TANG Ying.Shale gas and its exploration and development.Beijing:Advanced Education Press,2012.
[26]NI Xiaoming,CHEN Peng,LI Guangsheng,et al.Relations between productivity of CBM vertical wells and coal structure in Encun mine field.Natural Gas Geoscience,2010,21(3):508-512.
[27]HU Qi,WANG Shengwei,ZHANG Chen,et al.Coal structure affected to coalbed methane development in Qinnan region.Coal Science and Technology,2014,42(8):65-68.
[28]TAO Chuanqi,WANG Yanbin,NI Xiaoming,et al.Prediction model of coal-body structure and spatial distribution law based on logging parameters.Coal Science and Technology,2017,45(2):173-177.
[29]YANG Z B,QIN Y,WANG G X,et al.Investigation on coal seam gas formation of multi-coalbed reservoir in Bide-Santang Basin Southwest China.Arabian Journal of Geosciences,2015,8(8):5439-5448.
[30]QIN Y,MOORE T A,SHEN J,et al.Resources and geology of coalbed methane in China:A review.International Geology Review,2018,60(5/6):777-812.
[31]YANG Zhaobiao,QIN Yong,ZHANG Zhengguang,et al.Production layer combination selection for coalbed methane development in multicoalseams based on cluster analysis.Journal of China Coal Society,2018,43(6):1641-1646.
[32]QIN Yong,YANG Zhaobiao.Development methods and development geological unit for superposed CBM-bearing system.Chengdu:Annual Report of National Science and Technology Major Projects,2018.
[2]GAO Di,QIN Yong,YI Tongsheng.Geological condition,exploration and exploitation strategy of coal-bed methane resources in Guizhou,China.Coal Geology of China,2009,21(3):20-23.
[3]WU Caifang,LIU Xiaolei,ZHANG Shasha.Construction of index system of“Hierarchical progressive”geological selection of coalbed methane in multiple seam area of eastern Yunnan and western Guizhou.Journal of China Coal Society,2018,43(6):1647-1653.
[4]MAO Fengjun,JIANG Hong,OU Yafei,et al.3D structural modeling and its application in the Termit Basin,Niger.Earth Science Frontiers,2018,25(2):62-71.
[5]HU Wenrui,WEI Yi,BAO Jingwei.Development of the theory and technology for low permeability reservoirs in China.Petroleum Exploration and Development,2018,45(4):646-656.
[6]PAN M,LI Z L,GAO Z B,et al.3-D geological modeling concept,methods and key techniques.Acta Geologica Sinica(English Edition),2012,86(4):1031-1036.
[7]YANG Zhaobiao,ZHANG Zhengguang,QIN Yong,et al.Optimized combination method of production layer for coalbed methane development in multi-coal seams.Petroleum Exploration and Development,2018,45(1):297-304.
[8]ZOU Caineng,ZHANG Guosheng,YANG Zhi,et al.Geological concepts,characteristics,resource potential and key techniques of unconventional hydrocarbon:On unconventional petroleum geology.Petroleum Exploration and Development,2013,40(4):385-399.
[9]MENG Zhaoping,CHENG Langhong,LEI Zhiyong.Characters of in-situ stress field in Huainan mine area and its influence on stability of coal roof and floor.Coal Geology&Exploration,2007,35(1):21-25.
[10]CAI Lu,YAO Yanbin,ZHANG Yongping,et al.Hydraulic fracturing curve types of coal reservoirs in Zhengzhuang block,Qinshui basin and their geological influence factors.Acta Petrolei Sinica,2015,36(S1):83-90.
[11]SUN Liangzhong,KANG Yongshang,WANG Jin,et al.Vertical transformation of in-situ stress types and its control on coalbed reservoir permeability.Geological Journal of China Universities,2017,23(1):148-156.
[12]LI H,LAU H C,HUANG S.Coalbed methane development in China:Engineering challenges and opportunities.SPE186289-MS,2017.
[13]RICKMAN R,MULLEN M,PETRE J,et al.A practical use of shale petrophysics for stimulation design optimization:All shale plays are not clones of the Barnett shale.SPE 115258,2008.
[14]TAO S,TANG D Z,XU H,et al.Factors controlling highyield coalbed methane vertical wells in the Fanzhuang Block,Southern Qinshui Basin.International Journal of Coal Geology,2014,134:38-45.
[15]ZHOU Ying.Introduction to coal mining.Beijing:Coal Industry Press,2006.
[16]The National Standardization Administration of China.Technical specifications of coalbed methane resources exploration:GP/T 29119-2012.Beijing:China Standard Publishing House,2012.
[17]ZHAO Xianzheng,YANG Yanhui,SUN Fenjin,et al.Enrichment mechanism and exploration and development technologies of high rank coalbed methane in South Qinshui Basin,Shanxi Province.Petroleum Exploration and Development,2016,43(2):303-309.
[18]ZHAO Xin,JIANG Bo,XU Qiang,et al.Well pattern design and deployment for coalbed methane development.Petroleum Exploration and Development,2016,43(1):84-90.
[19]SONG Yan,LI Zhuo,JIANG Zhenxue,et al.Progress and development trend of unconventional oil and gas geological research.Petroleum Exploration and Development,2017,44(4):638-648.
[20]The Ministry of Land and Resources of China.Specifications for coalbed methane resources/reserves:DZ/T 0216-2010.Beijing:China Standard Publishing House,2011.
[21]XIONG Bin.Analysis on geological factors of single CBMwell productivity in Zhijin block.Reservoir Evaluation and Development,2014,4(4):58-62.
[22]SHAN Yansheng,BI Caiqin,CHI Huanpeng,et al.Geologcial characteristics of coalbed methane and optimization for favorable productive intervals of Yangmeishu syncline in Liupanshui area.Natural Gas Geoscience,2018,29(1):122-129.
[23]LI Wuzhong,TIAN Wenguang,CHEN Gang,et al.Research and application of appraisal variables for the prioritizing of coalbed methane area featured by different coal ranks.Natural Gas Industry,2010,30(6):45-47.
[24]FU Xuehai,QIN Yong,WEI Chongtao.Coalbed methane geology.Xuzhou:China University of Mining and Technology Press,2007.
[25]XIAO Gang,TANG Ying.Shale gas and its exploration and development.Beijing:Advanced Education Press,2012.
[26]NI Xiaoming,CHEN Peng,LI Guangsheng,et al.Relations between productivity of CBM vertical wells and coal structure in Encun mine field.Natural Gas Geoscience,2010,21(3):508-512.
[27]HU Qi,WANG Shengwei,ZHANG Chen,et al.Coal structure affected to coalbed methane development in Qinnan region.Coal Science and Technology,2014,42(8):65-68.
[28]TAO Chuanqi,WANG Yanbin,NI Xiaoming,et al.Prediction model of coal-body structure and spatial distribution law based on logging parameters.Coal Science and Technology,2017,45(2):173-177.
[29]YANG Z B,QIN Y,WANG G X,et al.Investigation on coal seam gas formation of multi-coalbed reservoir in Bide-Santang Basin Southwest China.Arabian Journal of Geosciences,2015,8(8):5439-5448.
[30]QIN Y,MOORE T A,SHEN J,et al.Resources and geology of coalbed methane in China:A review.International Geology Review,2018,60(5/6):777-812.
[31]YANG Zhaobiao,QIN Yong,ZHANG Zhengguang,et al.Production layer combination selection for coalbed methane development in multicoalseams based on cluster analysis.Journal of China Coal Society,2018,43(6):1641-1646.
[32]QIN Yong,YANG Zhaobiao.Development methods and development geological unit for superposed CBM-bearing system.Chengdu:Annual Report of National Science and Technology Major Projects,2018.