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天然气地球科学

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页岩气解析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

孟强，王晓锋，王香增，张丽霞，姜呈馥，李孝甫，史宝光   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室，甘肃 兰州 730000；2.中国科学院大学，北京 100049；
    3.陕西延长石油(集团)有限责任公司，陕西省页岩气勘探开发工程技术研究中心，陕西 西安 710075
  • 收稿日期:2014-04-08 修回日期:2014-05-23 出版日期:2015-02-10 发布日期:2015-02-10
  • 通讯作者: 王晓锋(1979-)，男，陕西岐山人，副研究员，博士，主要从事天然气地球化学研究. E-mail:wangxf@lzb.ac.cn.
  • 作者简介:孟强(1989-)，男，甘肃武都人，博士研究生，主要从事页岩气地球化学、同位素气体地球化学研究.E-mail：371424086@qq.com.
  • 基金资助:
    国家自然科学基金项目(编号：41372156)；国家科技重大专项(编号：2011ZX05008-004)联合资助.
     
     

Variation of Carbon Isotopic Composition of Alkanes During the Shale Gas Desorption Process and Its Geological Significance: A Case Study of Chang7 Shale ofYanchang Formation in Yishan Slope Southeast of Ordos Basin

MENG Qiang，WANG Xiao-feng，WANG Xiang-zeng，ZHANG Li-xia，JIANG Cheng-fu，LI Xiao-fu，SHI Bao-guang   

  1. 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China； 2.University of Chinese Academy of Sciences,Beijing 100049,China； 3.Shaanxi Yanchang Petroleum (Group) Co.,Ltd.,Xi′an 710075,China
  • Received:2014-04-08 Revised:2014-05-23 Online:2015-02-10 Published:2015-02-10

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摘要：

以鄂尔多斯盆地伊陕斜坡东南部延长组长7页岩为例，通过30余块页岩样品的解析实验研究了页岩气解析过程中烷烃碳同位素组成的变化规律，同时探讨了可能导致这种现象的原因及其地质意义。研究发现，页岩气在解析过程中甲烷碳同位素值增大了9.2‰(从-50.1‰~-40.9‰)，乙烷碳同位素值增大了2.8‰(从-35.5‰~-32.7‰)，丙烷碳同位素值几乎不发生变化。在常温或恒温加热条件下，页岩气解析过程中甲烷、乙烷碳同位素值持续增大，当升高温度时甲烷、乙烷碳同位素值先突然减小，然后慢慢变大。造成这种现象的原因可能主要是页岩气的吸附/解吸作用和同位素的扩散运移分馏作用。此外，页岩气的甲烷、乙烷碳同位素组成的这种变化特性，可能是页岩气甲烷碳同位素值相对于源岩热演化程度较小的重要原因，同时可以应用于压裂效果的评价和页岩气剩余资源量的评价中。
 

关键词: 页岩气, 解析, 碳同位素组成, 长7页岩, 地质意义

Abstract:

Taking the Yishan slope southeast Chang7 shale of Yanchang Formation in the Ordos Basin as an example,with  desorption experiments of more than 30 shale samples,this paper studied the variation of carbon isotopic composition of alkanes during the shale gas desorption process,also discussed the possible causes of this phenomenon and its geological significance.The study found that carbon isotopic composition become higher by 9.2‰ ( from -50.1‰ to -40.9‰) for methane of desorbed gas (δ13C1),become higher by 2.8‰ ( from -35.5‰ to -32.7‰) for ethane (δ13C2 ),and nearly no change for propane during the desorption process.At room temperature or constant temperature,carbon isotopic composition of methane and ethane (δ13C1 & δ13C2) continuously increases.When the temperature rises,δ13C1 & & δ13C2 values suddenly become low first and then slowly become high during the desorption process of shale gas.The reason for this phenomenon is probably due to the main adsorption/desorption of shale gas and diffusion migration fractionation of isotope.In addition,these variation characteristics of methane and ethane carbon isotope composition of shale gas may be the important reason for the low carbon isotopic composition of methane relative to the thermal evolution degree of source rock,and it can be applied to evaluate the amount of remaining resources of shale gas and the fracturing effect.
 

Key words: Shale gas, Carbon isotopic composition, Desorption, Chang 7 shale of Yanchang Formation, Geological significance

中图分类号: 

  • TE122.1+13

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