Characteristics of dissolved inorganic carbon in produced water from coalbed methane wells and its geological significance

YANG Zhaobiao,QIN Yong,QIN Zonghao,YI Tongsheng,LI Cunlei,ZHANG Zhengguang

Table 1 Basic development parameters and stable carbon isotope test results of CBM wells in the study area.

Well number Syncline Ro,max/ % Developedcoal seam Depth/ m Daily pro- duction/m3 δ13CDIC/ ‰ δ13C1/ ‰ Starting time of produc- tion (year-month) GP-1 Tucheng 1.4-1.69 6/9/12/13/15/16/29 847.00 337 -0.82 -42.90 2014-01 GP-2 1.4-1.69 1+3/5/9/10/11/13/15/16 764.00 408 11.27 unsampled 2014-01 GP-3 1.4-1.69 6/9/12/13/15/29 610.00 607 4.50 -43.60 2015-01 GP-4 1.4-1.69 6/9/13/15/16/29 564.50 464 6.64 unsampled 2015-01 GP-5 1.4-1.69 1+3/4/5/6/9/13/15/29 654.00 213 -2.73 -43.50 2015-01 GP-6 1.4-1.69 1+3/4/5/6/9/15/16/26/27/29 617.00 570 3.93 -41.90 2015-01 GP-7 1.4-1.69 1+3/4/5/12/15/27/29 902.00 277 0.19 unsampled 2015-01 GP-8 1.4-1.69 1+3/4/5/12/13/15/26/27/29 977.08 341 7.49 -42.30 2015-01 ZH1 Dahebian 1.09 C406/C409 852.35 1070 2.73 -44.10 2016-06 N1 Bide 2.39 30/32 876.00 111 27.156 -34.80* 2016-02 N3 2.20 30/32 918.00 674 -2.15 -34.30 2016-02 B1 2.19 2/3/6 596.70 882 -2.13 -34.50 2015-04 F2 Changgang 3.66 4/7/10 692.70 264 0.98 -33.70 2015-11 D2 Huangnitang 3.11 6/7/10 542.00 1152 -1.22 -34.80 2015-09 ZP1 Zhuzang 3.60 23 1105.00 3146 1.71 -34.40 2015-10 Z2 3.60 20/23/27/30 739.80 887 0.11 -34.00 2015-02 Z3 3.60 20/23/27/30 567.10 993 -1.07 -34.90 2015-05 Z4 3.60 20/23/27/30 561.50 1271 -6.68 -35.20 2015-02 Z5 3.60 20/23/27/30 689.40 1348 -1.84 -34.60 2015-05 Z6 3.60 20/23/27/30 759.00 1059 4.91 unsampled 2015-02