Geochemical characteristics and their origin of CBM in Xingxian area, Ordos basin

Authors

WANG Xiangye, Xi'an Research Institute Co. Ltd., China Coal Technology & Engineering Group Crop., Xi'an 710077, China
SUN Baoping, Xi'an Research Institute Co. Ltd., China Coal Technology & Engineering Group Crop., Xi'an 710077, China

Abstract

The distribution of carbon and hydrogen isotope of methane is of signification in revealing the origin, the distribution of CBM reservoir, and the source evaluation of CBM. To study the origins of coalbed methane and carbon dioxide, the data of the components、carbon and hydrogen isotopes of CBM from the desorption gas of coal core from Xingxian area were analyzed. With the CBM origins chart board, and the geological environment, the geological effect of the formation and the evolution of CBM were analyzed. the ratios of CBM with different origins were estimated. The results show that the δ¹³C, values of CH₄ in coal seams 8 are between -55.1‰ and -44.2‰, with an average of -49.2‰; the δ¹³C₁ values of CH₄ in coal seams 13 are between -65.7‰ and -55.7‰, with an average of -59.8‰. The carbon isotopes of CH₄ of the same coal seam were characterized by increase with the buried depth and decrease with the hydrodynamic conditions. The methane carbon isotope values were obviously lighter and the heavy hydrocarbon component were less, which show the gas was influenced by some factors and secondary transformation. Tectonic-thermal history and geological conditions of coal seams show that the forming conditions of secondary biogenic gas were found, and the biogas was generated by the reduction of CO₂. The δ¹³C values of CO₂ in coal seams 8 are between -17.3‰ and -4.8‰, the δ¹³C values of CO₂ in coal seams 13 are between -26.3‰ and -6.9‰, the CO₂ could be generated from thermal degration or thermal cracking or both at the early stage of coalification or after the latest coal seam uplift. This study provides a theoretical basis for the direction of coalbed methane exploration and development in this area.

Keywords

coalbed methane (CBM), geochemical characteristics, isotope, origin, secondary biogenic gas, north of Hedong coalfield

DOI

10.3969/j.issn.1001-1986.2020.04.022

Recommended Citation

W S. (2020) "Geochemical characteristics and their origin of CBM in Xingxian area, Ordos basin," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 23.
DOI: 10.3969/j.issn.1001-1986.2020.04.022
Available at: https://cge.researchcommons.org/journal/vol48/iss4/23

Reference

[1] 宋岩,张新民,柳少波,等. 中国煤层气地质与开发基础理论[M]. 北京:科学出版社,2012:14-15. SONG Yan,ZHANG Xinmin,LIU Shaobo. et al. Basic theory of coalbed methane geology and development in China[M]. Beijing:Science Press,2012:14-15.

[2] 琚宜文,李清光,颜志丰,等. 煤层气成因类型及其地球化学研究进展[J]. 煤炭学报,2014,39(5):806-815. JU Yiwen,LI Qingguang,YAN Zhifeng,et al. Origin types of CBM and their geochemical research progress[J]. Journal of China Coal Society,2014,39(5):806-815.

[3] LAW B E,RICE D D,Hydrocarbons from coal[C]. Canada:AAPG Special Publication,1993,38:159-184.

[4] SCOTT A R,KAISERW R,AYERS Jr. W B. Thermogenic and secondary biogenic gases,San Juan basin,Colorado and New Mexico-implications for coalbed gas producibility[J]. AAPG Bulletin,1994,78(8):1186-1209.

[5] 秦勇,唐修义,叶建平,等. 中国煤层甲烷稳定碳同位素分布与成因探讨[J]. 中国矿业大学学报,2000,29(2):113-119. QIN Yong,TANG Xiuyi,YE Jianping,et al. Characteristics and origins of stable carbon isotope in coalbed methane of China[J]. Journal of China University of Mining & Technology,2000,29(2):113-119.

[6] KOTARBA M J. Isotopic geochemistry and habitat of the natural gases from the Upper Carboniferous Zacler coal-bearing formation in the Nowa Ruda coal district(Lower Silesia,Poland[J]. Organic Geochemistry,1990,16(1/2/3):549-560.

[7] 陶明信. 煤层气地球化学研究现状与发展趋势[J]. 自然科学进展,2005,15(6):648-652. TAO Mingxin. Present situation and development of coalbed methane geochemical research[J]. Progress in Natural Science,2005,15(6):648-652.

[8] 宋岩,秦胜飞,赵孟军. 中国煤层气成藏的两大关键地质因素[J]. 天然气地球科学,2007,18(4):545-553. SONG Yan,QIN Shengfei,ZHAO Mengjun. Two key geological factors controlling the coalbed methane reservoirs in China[J]. Natural Gas Geoscience,2007,18(4):545-553.

[9] GOLDING S D,BORRHAM C J,FESTERLE J S. Stable isotope geochemistry of coalbed and shale gas and related production waters:A review[J]. International Journal of Coal Geology,2013,120:24-40.

[10] SONG Yan,LIU Shaobo,ZHANG Qun,et al. Coalbed methane genesis,occurrence and accumulation in China[J]. Petroleum Science,2012,9(3):269-280.

[11] FAIZ M,SAGHAFI A,SHERWOOD N,et al. The influence of petrological properties and burial history on coal seam methane reservoir characterization,Sydney basin,Australia[J]. International Journal of Coal Geology,2007,70(1/2/3):193-208.

[12] 段毅,吴应忠,赵阳,等. 不同成煤母质热解烃类气体氢碳同位素组成特征[J]. 天然气地球科学,2015,26(12):2365-2371. DUAN Yi,WU Yingzhong,ZHAO Yang,et al. Characteristics of hydrogen and carbon isotopic composition of pyrolysis hydrocarbon gases from different coal forming parent materials[J]. Natural Gas Geoscience,2015,26(12):2365-2371.

[13] 刘超,冯国瑞,曾凡桂. 沁水盆地南部潘庄区块废弃矿井煤层气地球化学特征及成因[J]. 煤田地质与勘探,2019,47(6):67-72. LIU Chao,FENG Guorui,ZENG Fangui. Origin and geochemical characteristics of coalbed methane in abandoned coal mines,Panzhuang block,southern Qinshui basin[J]. Coal Geology & Exploration,2019,47(6):67-72.

[14] 刘会虎,兰天贺,胡宝林,等. 淮南潘集外围深部煤层气地球化学特征及成因[J]. 煤炭学报,2018,43(2):498-506. LIU Huihu,LAN Tianhe,HU Baolin,et al. Geochemical characteristics and its origins of CBM in deep-seated coal seam around Panji mining area of Huainan[J]. Journal of China Coal Society,2018,43(2):498-506.

[15] 李建军,白培康,毛虎平,等. 郑庄-胡底煤层气地球化学特征及成因探讨[J]. 煤炭学报,2014,39(9):1802-1811. LI Jianjun,BAI Peikang,MAO Huping,et al. Analysis of geochemistry characteristics and its origin of CBM in Zhengzhuang and Hudi blocks[J]. Journal of China Coal Society,2014,39(9):1802-1811.

[16] 徐占杰,刘钦甫,郑启明,等. 沁水盆地北部太原组煤层气碳同位素特征及成因探讨[J]. 煤炭学报,2016,41(6):1467-1475. XU Zhanjie,LIU Qinfu,ZHENG Qiming,et al. Origins and carbon isotopic composition of coalbed methane and carbon dioxide from Taiyuan Formation,northern Qinshui basin,China[J]. Journal of China Coal Society,2016,41(6):1467-1475.

[17] 陶明信. 中国煤层气同位素地球化学初步研究[J]. 地质学报,2015,89(增刊1):185-186. TAO Mingxin. Preliminary study on the isotope geochemistry of coalbed methane in China[J]. Acta Geologica Sinica,2015,89(Sup.1):185-186.

[18] 曹代勇,聂敬,王安民,等. 鄂尔多斯盆地东缘临兴地区煤系气富集的构造-热作用控制[J]. 煤炭学报,2018,43(6):1526-1532. CAO Daiyong,NIE Jing,WANG Anmin,et al. Structural and thermal control of enrichment conditions of coal measure gases in Linxing block of eastern Ordos basin[J]. Journal of China Coal Society,2018,43(6):1526-1532.

[19] 谢英刚,孟尚志,万欢,等. 临兴地区煤系地层多类型天然气储层地质条件分析[J]. 煤炭科学技术,2015,43(9):71-75. XIE Yinggang,MENG Shangzhi,WAN Huan,et al. Analysis on geological conditions of multi type natural gas reservoirs in coal measures strata of Linxing area[J]. Coal Science and Technology,2015,43(9):71-75.

[20] 李贵红,张泓. 鄂尔多斯盆地东缘煤层气成因机制[J]. 中国科学:地球科学,2013,43(8):1359-1364. LI Guihong,ZHNG Hong. The origin mechanism of coalbed methane in the eastern edge of Ordos basin[J]. Science China:Earth Sciences,2013,43(8):1359-1364.

[21] 田文广,汤达祯,王志丽,等. 鄂尔多斯盆地东北缘保德地区煤层气成因[J]. 高校地质学报,2012,18(3):479-484. TIAN Wenguang,TANG Dazhen,WANG Zhili,et al. Origin of coalbed methane in Baode,northeastern of Ordos basin[J]. Geological Journal of China Universities,2012,18(3):479-484.

[22] 汪岗,秦勇,解奕炜,等. 古交区块煤层气地球化学特征及其成因[J]. 煤炭学报,2016,41(5):1180-1187. WANG Gang,QIN Yong,XIE Yiwei,et al. Geochemical characteristics and its origin of CBM in Gujiao blocks[J]. Journal of China Coal Society,2016,41(5):1180-1187.

[23] 张星星. 山西省河东煤田北部聚煤规律及控气作用研究[J]. 中国煤层气,2013,10(2):16-19. ZHANG Xingxing. Research on regularity of coal accumulation and role of coalbed methane control in the north of Hedong coalfield in Shanxi Province[J]. China Coalbed Methane,2013,10(2):16-19.

[24] 薛良喜,沈玉林,顾娇杨,等. 临兴地区煤系泥岩微量元素特征及其地质意义[J]. 煤田地质与勘探,2017,45(3):18-24. XUE Liangxi,SHEN Yulin,GU Jiaoyang,et al. Characteristic and geological significance of trace element in mudstone of Upper Carboniferous-Lower Permian in Linxing area[J]. Coal Geology & Exploration,2017,45(3):18-24.

[25] 李明潮,张五侪. 中国主要煤田的浅成煤成气[M]. 北京:科学出版社,1990. LI Mingchao,ZHANG Wuchai. Gas from shallow coal in main coalfields of China[M]. Beijing:Science Press,1990.

[26] 陶明信,王万春,段毅,等. 煤层气的成因和类型及其资源贡献[M]. 北京:科学出版社,2014. TAO Mingxin,WANG Wanchun,DUAN Yi,et al. Genesis,types and resource contribution of coalbed methane[M]. Beijing:Science Press,2014.

[27] 赵承锦. 鄂尔多斯盆地临兴地区上古生界天然气成藏机理与成藏模式研究[D]. 青岛:山东科技大学,2017:26-29. ZHAO Chengjin. Natural gas accumulation mechanism and models in the Upper Paleozoic of Linxing area,Ordos basin[D]. Qingdao:Shandong University of Science and Technology,2017:26-29.

[28] 谢英刚,秦勇,叶建平,等. 临兴地区上古生界煤系致密砂岩气成藏条件分析[J]. 煤炭学报,2016,41(1):181-191. XIE Yinggang,QIN Yong,YE Jianping,et al. Accumulation conditions of tight gas in the Upper Paleozoic of Linxing block[J]. Journal of China Coal Society,2016,41(1):181-191.

[29] LI Qingguang,JU Yiwen,BAO Yuan,et al. Composition,origin,and distribution of coalbed methane in the Huaibei coalfield,China[J]. Energy and Fuels,2015,29(2):546-555.

[30] 王越,陈世悦,梁绘媛,等. 鄂尔多斯盆地保德地区上古生界沉积相与沉积演化特征[J]. 沉积学报,2016,34(4):775-784. WANG Yue,CHEN Shiyue,LIANG Huiyuan,et al. Sedimentary facies and their evolution in the Upper Paleozoic of Baode area,Ordos basin[J]. Acta Sedimentologica Sinica,2016,34(4):775-784.

[31] KOTARBA M J,LEWAN M D. Characterizing thermogenic coalbed gas from Polish coals of different ranks by hydrous pyrolysis[J]. Organic Geochemistry,2004,35(5):615-646.

[32] 戴金星,石昕,卫延召. 无机成因油气论和无机成因的气田(藏)概略[J]. 石油学报,2001,22(6):5-10. DAI Jinxing,SHI Xin,WEI Yanzhao. Summary of the inorganic origin theory and the biogenic gas pools(fields)[J]. Acta Petrolei Sinica,2001,22(6):5-10.

[33] 宋岩,柳少波,洪峰,等. 中国煤层气地球化学特征及成因[J]. 石油学报,2012,33(增刊1):99-106. SONG Yan,LIU Shaobo,HONG Feng,et al. Geochemical characteristics and genesis of coalbed methane in China[J]. Acta Petrolei Sinica,2012,33(Sup.1):99-106.

[34] 巢海燕,王延斌. 鄂尔多斯盆地东南缘临汾区块煤层气成因及其影响[J]. 煤炭学报,2016,41(7):1769-1777. CHAO Haiyan,WANG Yanbin. Origin of coalbed methane and its influence in Linfen,southeastern Ordos basin[J]. Journal of China Coal Society,2016,41(7):1769-1777.

[35] SMITH J W,PALLASSER R J. Microbial origin of Australian coalbed methane[J]. AAPG Bulletin,80(6):891-897.

[36] TAO Mingxin,LI Jing,LI Xiaobin,et al. New approaches and markets for identifying secondary biogenic coalbed gas[J]. Acta Geologica Sinica,86(1):199-208.

[37] KOTARBA M J. Composition and origin of coalbed gases in the Upper Silesian and Lublin basins,Poland[J]. Organic Geochemistry,2001,32(1):163-180.

[38] WHITICAR M J. Stable isotope geochemistry of coals,humic kerogens and related natural gas[J]. International Journal of Coal Geology,1996,32(1/2/3/4):191-215.

[39] 孙泽飞. 临兴区块煤系非常规天然气共采可行性地质评价[D]. 徐州:中国矿业大学, 2016. SUN Zefei. Geological evaluation for co-mining feasibility of unconventional natural gases in coal series from Linxing block[D]. Xuzhou:China Mining University, 2016.

[40] 苏现波,徐影,吴昱,等. 盐度、pH对低煤阶煤层生物甲烷生成的影响[J]. 煤炭学报, 2011, 36(8):1302-1306. SU Xianbo, XU Ying, WU Yu, et al. Effect of salinity and pH on biogenic methane production of low-rank coal[J]. Journal of China Coal Society, 2011, 36(8):1302-1306.

[41] 刘洪林,李景明,王红岩,等. 水文地质条件对低煤阶煤层气成藏的控制作用[J]. 天然气工业, 2008, 28(7):20-22. LIU Honglin, LI Jingming, WANG Hongyan, et al. Control of hydrogeological conditions on accumulation of coalbed methane in low-rank coal[J]. Natural Gas Industry, 2008, 28(7):20-22.

[42] 戴金星. 天然气碳氢同位素特征和各类天然气鉴别[J]. 天然气地球科学, 1993, 4(2/3):1-40. DAI Jinxing. Hydrocarbon isotopic characteristics and identification of natural gas[J]. Natural Gas Geoscience, 1993, 4(2/3):1-40.