TEM monitoring technology of CO2 injection and transport in coal seam
Fang-Zhi CUI1,2, Tao ZHOU1,2, Bing ZHANG3
1. Geophysical Survey Party of Henan Coal Geology Bureau,Zhengzhou 450009,China 2. Henan Underground Engineering Exploration Information Engineering Technology Research Center,Zhengzhou 450009,China 3. China United Coalbed Methane Company, Beijing 100015,China
The injection of CO2 into the coal seam changes the CO2 saturation of the coal seam.According to Archie's empirical formula,there are obvious differences in coal seam resistivity before and after CO2 injection,which provides conditions for TEM monitoring.In the development of coalbed methane in Shizhuang North Block,the electrical resistivity changes of coalbed methane before and after CO2 injection were monitored by TEM. The results show that the increase of electrical resistivity of coal seam can be caused by CO2 injection in coal seam, and can be monitored by TEM. At the same time,the induced voltage can directly reflect the change of formation electrical characteristics caused by CO2 injection.The equivalent resistivity from the surface to the coal seam is calculated by using the calculation formula of formation equivalent resistivity,and the transient electromagnetic sampling delay and the corresponding induced voltage of the formation near the coal seam are solved.The variation of induced voltage relative to background value reflects the change of formation electrical properties.The variation and rate of formation induced voltage caused by CO2 injection are analyzed and calculated.Combined with the error range,the range of CO2 migration enrichment zone can be inferred.
崔方智, 周韬, 张兵. 煤层中CO2注入运移瞬变电磁法监测技术探索[J]. 物探与化探, 2020, 44(3): 573-581.
Fang-Zhi CUI, Tao ZHOU, Bing ZHANG. TEM monitoring technology of CO2 injection and transport in coal seam. Geophysical and Geochemical Exploration, 2020, 44(3): 573-581.
Fig.3 1240线反演电阻率断面 a—2011年10月背景值观测;b—2013年11月SX006-1井注入700 t CO2后的观测; c—2015年10月SX006-1井注入1 619 t CO2后闷井10个月,随后SX006井注入1 750 t CO2后的观测。椭圆区域为异常区,下同
Fig.4 1260线反演电阻率断面 2014年11月SX006-1井注入1 460 t CO2后的观测
Fig.5 煤层附近地层感应电压平面对比 a—2011年10月背景值观测; b—2013年11月SX006-1井注入700 t CO2后的观测; c—2015年10月SX006-1井注入1 619 t CO2后闷井10个月,随后SX006井注入1 750 t CO2、SX006-2井注入800 t CO2后的观测
Fig.6 煤层附近地层感应电压相对于背景值的变化量平面(上图)和变化率平面(下图) a—2013年11月SX006-1井注入700 t CO2; b—2015年10月SX006-1井注入1 619 t CO2后闷井10个月,随后SX006井注入1 750 t CO2、SX006-2井注入800 t CO2
Niu Z L. Principle of time domain electromagnetic method [M]. Changsha: Central South University of Technology Press, 2007: 1-6-18-33.
[4]
朴化荣, 电磁测深法原理[M]. 北京: 地质出版社, 1990.
[4]
Pu H R. Principle of electromagnetic sounding [M]. Beijing: Geological Publishing House, 1990.
[5]
考夫曼 A, 凯勒 G V. 频率域和时间域电磁测深[M]. 北京: 地质出版社, 1987.
[5]
Kaufman A, Keller G V. Electromagnetic sounding in frequency domain and time domain [M]. Beijing: Geological Publishing House, 1987.
[6]
范志强, Sam Wong 叶建平, 等. 中国二氧化碳注入提高煤层气采收率先导性试验技术[M]. 北京: 地质出版社, 2008.
[6]
Fan Z Q, Sam W, Ye J P, et al. Pilot test technology for improving coalbed methane recovery by carbon dioxide injection in China [M]. Beijing: Address Press, 2008.
Zhu X A, Wang Y D. The new progress on movement monitoring technique and method research of CO2 in domestic and abroad[J]. China coalbed methane, 2011,(5):3-7.
Tian B Q, Xu P F, Pang Z H, et al. Research progress of carbon dioxide capture and store technique and geophysical monitoring research[J]. Progress in Geophysics, 2014,29(3):1431-1438.
Hao Y J, Yang D H. Research progress of carbon dioxide capture and geological sequestration problem and seismic monitoring research[J]. Progress in Geophysics, 2012,27(6):2369-2383.
Zhang Q, Cui Y J, Bu X P, et al. CCS monitoring technology development status analysis[J]. Shenhua Science and Technolog, 2011,9(2):77-82.
[11]
禹林. 二氧化碳深部盐水层地质封存物理模拟探索性研究[D]. 北京;北京交通大学, 2010.
[11]
Yu L. Exploratory research on technology of physical simulation of carbon dioxide geological storage in deep saline aquifer[D]. Beijing: Beijing jiaotong university, 2010.
[12]
Dana Kiesslinga, et al. Geoelectricl methods for monitoring geological CO2 storage:First results from cross-hole and surface-down hole measurements from the CO2SINK test site at Ketzin (Germany)[D]. International Journal of Greenhouse Gas Control, 2010(4):816-826.
Zhong S, Wang S D. The application of combined ground and underground coal mine transient electromagnetic methods to the exploration of water-rich area[J]. Geophysical and Geochemical Exploration, 2016,40(3):156-157.
Yao W H. The one-dimensional adaptive inversion method for large loop source TEM and its application[J]. Geophysical and Geochemical Exploration, 2019,43(3):584-588.
Yan S, Xue G Q, Chen M S. Review and prospect of transient electromagnetic response theory of large circuit source[J]. Progress in Geophysics, 2011,26(3):941-947.
Liang W G, Zhang B N, Han J J, et al. Experimental study on coal bed methane displacement and recovery by super critical carbon dioxide injection[J]. Journal of China Coal Society, 2014,39(8):1511-1520.
Zhang M H, Wu S Y, Li C T. Mass exchange mechanism of coalbed methane exploitation by CO2 injection in coal measure strata[J]. Journal of China Coal Society, 2013,38(7):1196-1200.
Yang H M, Xu D L, Chen L W. Quantitative study on displacement-replacement of methane in coal through CO2 injection[J]. Journal of Safety Science and Technology, 2016,12(5):38-42.
Zhu X A, Zhou T, Cui F Z. Transient electromagnetic method and its application in carbon dioxide injection and migration monitoring [M]. Beijing: Coal Industry Press, 2016: 183-185.
Cui F Z, Zhou T. Engineering Research Report on transient electromagnetic exploration and active carbon radon measurement after CO2 injection of coalbed methane [R]. Geophysical survey team of Henan Coalfield Geological Bureau, 2015.
Geological and mineral industry standard of the people’s Republic of China. DZ/t0187-1997 Technical code for ground transient electromagnetic method[S]. Beijing: China Standards Press, 1997.
