中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义

doi:10.7623/syxb201908005

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摘要

中扬子宜昌地区下寒武统水井沱组页岩具有良好的气体显示，是四川盆地外页岩气新的勘探区。通过对2口页岩气探井共64块水井沱组页岩的含气性现场解吸，测定了解吸气含量、气体组分、解吸气碳和氢稳定同位素组成，分析了解吸气组分变化、解吸过程中气态烃和二氧化碳同位素的变化，同时探讨了页岩气赋存状态、气体稳定同位素倒转特点及其地质意义。研究结果表明：水井沱组页岩现场解吸气含量为0.32~5.48 m³/t，连续含气量大于2 m³/t的地层厚44.05 m，含气性与TOC有很强的正相关性；解吸气甲烷含量为81.90%~95.48%，乙烷含量为0.78%~3.95%，含微量丙烷，为典型的干气；非烃气体中氮气含量稍高，平均约为6.7%，二氧化碳含量低于1%，不含H₂S；吸附气占50%~60%，游离气占40%~50%。解吸早期吸附性弱的CH₄和N₂先脱附出来，吸附性强的C₂H₆和CO₂后脱附出来，至解吸结束仍有相当量的C₂H₆和CO₂未脱附出来。解吸过程中碳、氢同位素均发生变化，δ¹³C_CH₄变化范围为-39.92 ‰~-25.86 ‰，δ¹³C_C₂H₆为-41.57 ‰~-39.34 ‰，δ¹³C_C₃H₈为-40.89 ‰~-35.46 ‰，δ¹³C_CO₂为-23.42 ‰~-19.23 ‰；δD_CH₄为-136.90 ‰~-128.00 ‰，δD_C₂H₆为-160.45 ‰~-155.30 ‰；由于同位素的质量分馏效应，解吸过程中残留的甲烷碳同位素增大了5.15 ‰~13.33 ‰，甲烷氢同位素增大1.64 ‰~8.90 ‰，乙烷碳、氢同位素和二氧化碳的碳同位素基本不变。气体碳同位素分馏还受页岩物性的影响，大的孔隙体积引起更显著的甲烷碳同位素分馏效果，同时还引起乙烷体积含量的差异。利用解吸半量体积所取气样的同位素值代表全部气体的平均值，δ¹³C_CH₄平均值为-33.19 ‰，δ¹³C_C₂H₆平均值为-40.04 ‰，δ¹³C_C₃H₈平均值为-39.07 ‰，页岩气表现出δ¹³C_CH₄ > δ¹³C_C₂H₆且δ¹³C_C₃H₈ > δ¹³C_C₂H₆、δD_CH₄ > δD_C₂H₆的同位素"倒序"特征。与威远地区下寒武统筇竹寺组类似，宜昌地区水井沱组页岩气同样处于气态烃同位素反转阶段的早期，具有多源复合热成因气的特点。

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	罗胜元
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关键词 ：页岩气, 现场解吸, 气体组分, 碳同位素, 氢同位素, 下寒武统水井沱组, 中扬子地区

Abstract：

As displaying good gas reserves, the Lower Cambrian Shuijingtuo Formation shale in Yichang area, Middle Yangtze region is a new exploration area of shale gas in Sichuan Basin. Based on the onsite analysis of gas-bearing property for 64 pieces of Shuijingtuo Formation gas shale from two shale gas exploration wells, this paper determines the analytical gas content, gas composition, carbon and hydrogen stable isotopic composition of analytical gas, analyzes the changes in the analytical gas composition and the gaseous hydrocarbon and carbon dioxide isotope during analytical process, and explores the occurrence state of shale gas, inversion characteristics and geological significance of gas stable isotope. The results show that Shuijingtuo Formation shale contains the analytical gas of 0.32-5.48 m³/t, and the formation with continuous gas content greater than 2 m³/t is 44.05 m thick, demonstrating a strong positive correlation between gas content and TOC. The analytical gas contains methane and ethane of 81.90% -95.48% and 0.78% -3.95%, respectively and also a trace of propane, classified as a typical dry gas; the content of nitrogen is a bit high in non-hydrocarbon gases, with an average of about 6.7%, and the carbon dioxide content is less than 1%, free of H₂S. The adsorption gas and free gas accounts for 50% -60% and 40% -50% respectively. In the early stage of adsorption, CH₄ and N₂, with weak adsorbability, are first desorbed, followed by C₂H₆ and CO₂, with strong adsorbability; until the end of gas analysis, a considerable amount of C₂H₆ and CO₂ still has not been desorbed. During the analytical process, the carbon and hydrogen isotopes have changed, the variation range of δ¹³CH₄, δ¹³C₂H₆, δ¹³C₃H₈, δ¹³CO₂, δD_CH₄ and δD_C₂H₆ is -39.92 ‰--25.86 ‰, -41.57 ‰--39.34 ‰, -40.89 ‰--35.46 ‰, -23.42 ‰--19.23 ‰, -136.90 ‰--128.00 ‰ and -160.45 ‰--155.30 ‰, respectively. Due to the mass fractionation effect of isotope, the methane carbon isotope and methane hydrogen isotope remained in the analytical process is increased by 5.15 ‰ -13.33 ‰ and 1.64 ‰ -8.90 ‰ respectively; the ethane carbon, hydrogen isotope and carbon isotope of carbon dioxide is basically unchanged. The gaseous carbon isotope fractionation is also affected by the physical properties of shale, and the larger pore volume will lead to a more significant methane carbon isotope fractionation effect, as well as a difference in the volume content of ethane. The isotope value of the gas sample taken by desorbing the half volume represents the average value of all gases; the average value of δ¹³CH₄, δ¹³C₂H₆ and δ¹³C₃H₈ is -33.19 ‰, -40.04 ‰ and -39.07 ‰, respectively; the shale gas shows the "reverse order" feature of isotope:δ¹³CH₄ > δ¹³C₂H₆,δ¹³C₂H₆ < δ¹³C₃H₈, δD_CH₄ > δD_C₂H₆. Similar to the Lower Cambrian Qizhusi Formation in Weiyuan, Shuijingtuo Formation shale gas in Yichang area is also in the early stage of reversal of gaseous hydrocarbon isotope, and has the characteristics of multi-source composite thermogenic gas.

Key words： shale gas canister desorption gas component carbon isotope hydrogen isotope Lower Cambrian Shuijingtuo Formation Middle Yangtze region

收稿日期: 2018-04-26

中图分类号:

TE132.2

基金资助:

国家科技重大专项"中扬子高演化页岩气赋存机理与富集规律研究"（2016ZX05034-001-002）及中国地质调查局"宜昌斜坡页岩气有利区战略调查"项目（DD20179615）资助。

通讯作者: 罗胜元,男,1986年11月生,2009年获中国地质大学(武汉)学士学位,2014年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国地质调查局武汉地质调查中心工程师,主要从事页岩气、油气地质调查与研究工作。Email:loshyv@163.com E-mail: loshyv@163.com

作者简介: 罗胜元,男,1986年11月生,2009年获中国地质大学(武汉)学士学位,2014年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国地质调查局武汉地质调查中心工程师,主要从事页岩气、油气地质调查与研究工作。Email:loshyv@163.com

引用本文:

罗胜元, 陈孝红, 刘安, 李海, 孙冲. 中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义[J]. 石油学报, 2019, 40(8): 941-955.
Luo Shengyuan, Chen Xiaohong, Liu An, Li Hai, Sun Chong. Characteristics and geological significance of canister desorption gas from the Lower Cambrian Shuijingtuo Formation shale in Yichang area,Middle Yangtze region[J]. Acta Petrolei Sinica, 2019, 40(8): 941-955.

链接本文:

http://www.syxb-cps.com.cn/CN/10.7623/syxb201908005 或 http://www.syxb-cps.com.cn/CN/Y2019/V40/I8/941

[1]	魏国齐,杨威,谢武仁,等.四川盆地震旦系-寒武系天然气成藏模式与勘探领域[J].石油学报,2018,39(12):1317-1327.
	WEI Guoqi,YANG Wei,XIE Wuren,et al.Accumulation modes and exploration domains of Sinian-Cambrian natural gas in Sichuan Basin[J].Acta Petrolei Sinica,2018,39(12):1317-1327.
[2]	邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.
	ZOU Caineng,DONG Dazhong,WANG Shejiao,et al.Geological characteristics,formation mechanism and resource potential of shale gas in China[J].Petroleum Exploration and Development,2010,37(6):641-653.
[3]	聂海宽,张金川,李玉喜.四川盆地及其周缘下寒武统页岩气聚集条件[J].石油学报,2011,32(6):959-967.
	NIE Haikuan,ZHANG Jinchuan,LI Yuxi.Accumulation conditions of the Lower Cambrian shale gas in the Sichuan Basin and its periphery[J].Acta Petrolei Sinica,2011,32(6):959-967.
[4]	王朋飞,姜振学,韩波,等.中国南方下寒武统牛蹄塘组页岩气高效勘探开发储层地质参数[J].石油学报,2018,39(2):152-162.
	WANG Pengfei,JIANG Zhenxue,HAN Bo,et al.Reservoir geological parameters for efficient exploration and development of Lower Cambrian Niutitang Formation shale gas in South China[J].Acta Petrolei Sinica,2018,39(2):152-162.
[5]	郭彤楼.中国式页岩气关键地质问题与成藏富集主控因素[J].石油勘探与开发,2016,43(3):317-326.
	GUO Tonglou.Key geological issues and main controls on accumulation and enrichment of Chinese shale gas[J].Petroleum Exploration and Development,2016,43(3):317-326.
[6]	程克明,王世谦,董大忠,等.上扬子区下寒武统筇竹寺组页岩气成藏条件[J].天然气工业,2009,29(5):40-44.
	CHENG Keming,WANG Shiqian,DONG Dazhong,et al.Accumulation conditions of shale gas reservoirs in the Lower Cambrian Qiongzhusi Formation,the upper Yangtze region[J].Natural Gas Industry,2009,29(5):40-44.
[7]	李昂,丁文龙,张国良,等.滇东地区马龙区块筇竹寺组海相页岩储层特征及对比研究[J].地学前缘,2016,23(2):176-189.
	LI Ang,DING Wenlong,ZHANG Guoliang,et al.Reservoir characteristics of marine shale in the Malong block of eastern Yunnan province and comparison analysis[J].Earth Science Frontiers,2016,23(2):176-189.
[8]	王淑芳,张子亚,董大忠,等.四川盆地下寒武统筇竹寺组页岩孔隙特征及物性变差机制探讨[J].天然气地球科学,2016,27(9):1619-1628.
	WANG Shufang,ZHANG Ziya,DONG Dazhong,et al.Microscopic pore structure and reasons making reservoir property weaker of Lower Cambrian Qiongzhusi shale,Sichuan Basin,China[J].Natural Gas Geoscience,2016,27(9):1619-1628.
[9]	聂海宽,包书景,高波,等.四川盆地及其周缘下古生界页岩气保存条件研究[J].地学前缘,2012,19(3):280-294.
	NIE Haikuan,BAO Shujing,GAO Bo,et al.A study of shale gas preservation conditions for the Lower Paleozoic in Sichuan Basin and its periphery[J].Earth Science Frontiers,2012,19(3):280-294.
[10]	刘忠宝,高波,张钰莹,等.上扬子地区下寒武统页岩沉积相类型及分布特征[J].石油勘探与开发,2017,44(1):21-31.
	LIU Zhongbao,GAO Bo,ZHANG Yuying,et al.Types and distribution of the shale sedimentary facies of the Lower Cambrian in Upper Yangtze area,South China[J].Petroleum Exploration and Development,2017,44(1):21-31.
[11]	黄金亮,邹才能,李建忠,等.川南下寒武统筇竹寺组页岩气形成条件及资源潜力[J].石油勘探与开发,2012,39(1):69-75.
	HUANG Jinliang,ZOU Caineng,LI Jianzhong,et al.Shale gas generation and potential of the Lower Cambrian Qiongzhusi Formation in Southern Sichuan Basin,China[J].Petroleum Exploration and Development,2012,39(1):69-75.
[12]	董大忠,高世葵,黄金亮,等.论四川盆地页岩气资源勘探开发前景[J].天然气工业,2014,34(12):1-15.
	DONG Dazhong,GAO Shikui,HUANG Jinliang,et al.A discussion on the shale gas exploration & development prospect in the Sichuan Basin[J].Natural Gas Industry,2014,34(12):1-15.
[13]	孟宪武,田景春,张翔,等.川西南井研地区筇竹寺组页岩气特征[J].矿物岩石,2014,34(2):96-105.
	MENG Xianwu,TIAN Jingchun,ZHANG Xiang,et al.Characteristics of shale gas of the Qiongzhusi Formation in Jingyan area of Southwest Sichuan[J].Journal of Mineralogy and Petrology,2014,34(2):96-105.
[14]	曾义金,陈作,卞晓冰.川东南深层页岩气分段压裂技术的突破与认识[J].天然气工业,2016,36(1):61-67.
	ZENG Yijin,CHEN Zuo,BIAN Xiaobing.Breakthrough in staged fracturing technology for deep shale gas reservoirs in SE Sichuan Basin and its implications[J].Natural Gas Industry,2016,36(1):61-67.
[15]	赵文智,李建忠,杨涛,等.中国南方海相页岩气成藏差异性比较与意义[J].石油勘探与开发,2016,43(4):499-510.
	ZHAO Wenzhi,LI Jianzhong,YANG Tao,et al.Geological difference and its significance of marine shale gases in South China[J].Petroleum Exploration and Development,2016,43(4):499-510.
[16]	朱汉卿,贾爱林,位云生,等.蜀南地区富有机质页岩孔隙结构及超临界甲烷吸附能力[J].石油学报,2018,39(4):391-401.
	ZHU Hanqing,JIA Ailin,WEI Yunsheng,et al.Pore structure and supercritical methane sorption capacity of organic-rich shales in southern Sichuan Basin[J].Acta Petrolei Sinica,2018,39(4):391-401.
[17]	聂海宽,金之钧,马鑫,等.四川盆地及邻区上奥陶统五峰组-下志留统龙马溪组底部笔石带及沉积特征[J].石油学报,2017,38(2):160-174.
	NIE Haikuan,JIN Zhijun,MA Xin,et al.Graptolites zone and sedimentary characteristics of Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in Sichuan Basin and its adjacent areas[J].Acta Petrolei Sinica,2017,38(2):160-174.
[18]	孟强,王晓锋,王香增,等.页岩气解吸过程中烷烃碳同位素组成变化及其地质意义——以鄂尔多斯盆地伊陕斜坡东南部长7页岩为例[J].天然气地球科学,2015,26(2):333-340.
	MENG Qiang,WANG Xiaofeng,WANG Xiangzeng,et al.Variation of carbon isotopic composition of alkanes during the shale gas desorption process and its geological significance:a case study of Chang 7 shale of Yanchang Formation in Yishan slope southeast of Ordos Basin[J].Natural Gas Geoscience,2015,26(2):333-340.
[19]	唐颖,李乐忠,蒋时馨.页岩储层含气量测井解释方法及其应用研究[J].天然气工业,2014,34(12):46-54.
	TANG Ying,LI Lezhong,JIANG Shixin.A logging interpretation methodology of gas content in shale reservoirs and its application[J].Natural Gas Industry,2014,34(12):46-54.
[20]	吴庆红,李晓波,刘洪林,等.页岩气测井解释和岩心测试技术——以四川盆地页岩气勘探开发为例[J].石油学报,2011,32(3):484-488.
	WU Qinghong,LI Xiaobo,LIU Honglin,et al.Log interpretations and the application of core testing technology in the shale-gas:taking the exploration and development of the Sichuan Basin as an example[J].Acta Petrolei Sinica,2011,32(3):484-488.
[21]	王飞宇,关晶,冯伟平,等.过成熟海相页岩孔隙度演化特征和游离气量[J].石油勘探与开发,2013,40(6):764-768.
	WANG Feiyu,GUAN Jing,FENG Weiping,et al.Evolution of overmature marine shale porosity and implication to the free gas volume[J].Petroleum Exploration and Development,2013,40(6):764-768.
[22]	ROSS D J K,BUSTIN R M.Shale gas potential of the Lower Jurassic Gordondale Member,northeastern British Columbia,Canada[J].Bulletin of Canadian Petroleum Geology,2007,55(1):51-75.
[23]	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.
	SONG Yan,ZHANG Xinmin,LIU Shaobo,et al.Basic geological and development theory of CBM in China[M].Beijing:Science Press,2012.
[24]	聂百胜,段三明.煤吸附瓦斯的本质[J].太原理工大学学报,1998,29(4):417-421.
	NIE Baisheng,DUAN Sanming.The adsorption essence of gas on coal surface[J].Journal of Taiyuan University of Technology,1998,29(6):417-421.
[25]	戴金星.我国有机烷烃气的氢同位素的若干特征[J].石油勘探与开发,1990,17(5):27-32.
	DAI Jinxing.Characteristics of hydrogen isotopes of paraffinic gas in China[J].Petroleum Exploration and Development,1990,17(5):27-32.
[26]	王大锐,杨家建.有机物中氢同位素分析及在石油勘探中的应用[J].石油勘探与开发,1991,18(1):31-37.
	WANG Darui,YANG Jiajian.Analysis of hydrogen isotopes in organic matters and its application in petroleum exploration[J].Petroleum Exploration and Development,1991,18(1):31-37.
[27]	SCHIMMELMANN A,SESSIONS A L,BOREHAM C J,et al.D/H ratios in terrestrially sourced petroleum systems[J].Organic Geochemistry,2004,35(10):1169-1195.
[28]	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.Characteristics of carbon and hydrogen isotopes of natural gas and its identification[J].Natural Gas Geoscience,1993,4(2/3):1-40.
[29]	SCHLOEMER S,KROOSS B M.Molecular transport of methane,ethane and nitrogen and the influence of diffusion on the chemical and isotopic composition of natural gas accumulations[J].Geofluids,2004,4(1):81-108.
[30]	XIA Xinyu,TANG Yongchun.Isotope fractionation of methane during natural gas flow with coupled diffusion and adsorption/desorption[J].Geochimica et Cosmochimica Acta,2012,77:489-503.
[31]	段利江,唐书恒,刘洪林,等.煤储层物性对甲烷碳同位素分馏的影响[J].地质学报,2008,82(10):1330-1334.
	DUAN Lijiang,TANG Shuheng,LIU Honglin,et al.The impact of coal reservoir physical properties on carbon isotope fractionation of coalbed methane[J].Acta Geologica Sinica,2008,82(10):1330-1334.
[32]	HARPALANI S,CHEN Guoliang.Influence of gas production induced volumetric strain on permeability of coal[J].Geotechnical & Geological Engineering,1997,15(4):303-325.
[33]	柳广弟,赵忠英,孙明亮,等.天然气在岩石中扩散系数的新认识[J].石油勘探与开发,2012,39(5):559-565.
	LIU Guangdi,ZHAO Zhongying,SUN Mingliang,et al.New insights into natural gas diffusion coefficient in rocks[J].Petroleum Exploration and Development,2012,39(5):559-565.
[34]	陈强,康毅力,游利军,等.页岩微孔结构及其对气体传质方式影响[J].天然气地球科学,2013,24(6):1298-1304.
	CHEN Qiang,KANG Yili,YOU Lijun,et al.Micro-pore structure of gas shale and its effect on gas mass transfer[J].Natural Gas Geoscience,2013,24(6):1298-1304.
[35]	ROONEY M A,CLAYPOOL G E,CHUNG H M.Modeling thermogenic gas generation using carbon isotope ratios of natural gas hydrocarbons[J].Chemical Geology,1995,126(3/4):219-232.
[36]	戴金星,宋岩,戴春林,等.中国东部无机成因气及其气藏形成条件[M].北京:科学出版社,1995.
	DAI Jinxing,SONG Yan,DAI Chunlin,et al.Inorganic gas and its gas reservoir forming conditions in eastern China[M].Beijing:Science Press,1995.
[37]	ISHIKAWA T,UENO Y,KOMIYA T,et al.Carbon isotope chemostratigraphy of a Precambrian/Cambrian boundary section in the Three Gorge area,South China:prominent global-scale isotope excursions just before the Cambrian explosion[J].Gondwana Research,2008,14(1/2):193-208.
[38]	BURRUSS R C,LAUGHREY C D.Carbon and hydrogen isotopic reversals in deep basin gas:evidence for limits to the stability of hydrocarbons[J].Organic Geochemistry,2010,41(12):1285-1296.
[39]	STRAPO? D,SCHIMMELMANN A,MASTALERZ M.Carbon isotopic fractionation of CH4 and CO2 during canister desorption of coal[J].Organic Geochemistry,2006,37(2):152-164.
[40]	盖海峰,肖贤明.页岩气碳同位素倒转:机理与应用[J].煤炭学报,2013,38(5):827-833.
	GAI Haifeng,XIAO Xianming.Mechanism and application of carbon isotope reversal of shale gas[J].Journal of China Coal Society,2013,38(5):827-833.
[41]	何江林,王剑,余谦,等.外源补给型页岩气的发现及油气地质意义[J].石油学报,2018,39(1):12-22.
	HE Jianglin,WANG Jian,YU Qian,et al.Discovery of exogenous type shale gas and its geological significance to hydrocarbon exploration[J].Acta Petrolei Sinica,2018,39(1):12-22.
[42]	TILLEY B,MUEHLENBACHS K.Isotope reversals and universal stages and trends of gas maturation in sealed,self-contained petroleum systems[J].Chemical Geology,2013,339:194-204.
[43]	RODRIGUEZ N D,PHILP R P.Geochemical characterization of gases from the Mississippian Barnett Shale,Fort Worth Basin,Texas[J].AAPG Bulletin,2010,94(11):1641-1656.
[44]	ZUMBERGE J,FERWORN K,BROWN S.Isotopic reversal (‘rollover’-in shale gases produced from the Mississippian Barnett and Fayetteville formations[J]. Marine and Petroleum Geology,2012,31(1):43-52.
[45]	DAI Jinxing,ZOU Caineng,DONG Dazhong,et al.Geochemical characteristics of marine and terrestrial shale gas in China[J].Marine and Petroleum Geology,2016,76:444-463.
[46]	YANG Rui,HE Sheng,HU Qinhong,et al.Geochemical characteristics and origin of natural gas from Wufeng-Longmaxi shales of the Fuling gas field,Sichuan Basin (China)[J].International Journal of Coal Geology,2017,171:1-11.
[47]	吴伟,房忱琛,董大忠,等.页岩气地球化学异常与气源识别[J].石油学报,2015,36(11):1332-1340,1366.
	WU Wei,FANG Chenchen,DONG Dazhong,et al.Shale gas geochemical anomalies and gas source identification[J].Acta Petrolei Sinica,2015,36(11):1332-1340,1366.