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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

页岩吸附气含量测定的影响因素定量分析

马行陟，柳少波，姜林，田华，郝加庆   

  1. （1.中国石油勘探开发研究院，北京 100083；2.中国石油天然气集团公司盆地构造与油气成藏重点实验室，北京 100083；3.提高石油采收率国家重点实验室，北京 100083）
  • 收稿日期:2015-08-14 修回日期:2016-01-26 出版日期:2016-03-10 发布日期:2016-03-10
  • 作者简介:马行陟（1984-），男，山东济宁人，工程师，博士，主要从事天然气地质和油气成藏机理研究. E-mail:maxingzhi@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份公司“十二五”科技攻关课题(编号：2014A-0214)资助.

Quantitative analysis on affecting factors of gas adsorption capacity measurement on the shale

Ma Xing-zhi，Liu Shao-bo，Jiang Lin，Tian Hua，Hao Jia-qing   

  1. (1.Research Institute of Petroleum Exploration and Development,Beijing 100083,China;2.Key Laboratory of
    Basin Structure and Petroleum Accumulation,China National Petroleum Corporation,Beijing 100083,China;
    3.State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China)
  • Received:2015-08-14 Revised:2016-01-26 Online:2016-03-10 Published:2016-03-10

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摘要：

页岩气是一种重要的非常规天然气资源，页岩吸附气含量的准确测定是正确评价页岩含气量和资源潜力的关键参数。通常采用等温吸附实验的方法确定页岩吸附气含量。但是，现在多数情况下页岩高压时的吸附量出现负值，等温吸附曲线特征也呈现下降形态，与以往在煤层气领域的认识明显不同。为了正确解释此种现象，研究中选取了国际页岩吸附量测定对比的标准样品（Kimmeridge页岩、Posidonia页岩）以及我国四川盆地龙马溪组和塔里木盆地奥陶系页岩等样品，开展了一系列的等温吸附实验和数值计算，对页岩吸附气含量测定的影响因素进行了半定量—定量分析。研究表明，气体状态方程、自由空间体积、压力传感器精度和空白测试等是影响页岩吸附气含量测定的主要因素。气体状态方程中，Se-W方程最适用于页岩的甲烷吸附量计算，其次是S-R-K方程，最差的是P-R方程。自由空间体积与吸附量呈负相关关系，即自由空间体积偏大，吸附量比实际减小；相反，自由空间体积偏小，吸附量结果比实际大，高压条件下对吸附量的影响更为明显。相对于温度传感器，压力传感器精度对页岩甲烷吸附量的影响更为突出，万分之一精度压力传感器的等温吸附实验结果比千分之一精度的更精确。此外，未经过空白测试校正的页岩吸附量通常比实际吸附量低，且会导致吸附量出现负值。因此，开展页岩吸附气含量的测定需要对影响因素进行系统的认识和相应的校正。

关键词: 页岩气, 等温吸附, 含气量, 影响因素, 校正方法

Abstract:

Shale gas,stored in micro-nano pore systems in free state and clay and organic matter in sorption state,is one important type of unconventional natural gas resource.Accurate determination of adsorption gas content is a key parameter to evaluate the gas content and resource potential of shale.Usually the method of isothermal adsorption experiment is adopted to determine the adsorption capacity of the shale.However,obviously different with previous knowledge in the field of coalbed methane,the adsorption capacity of the shale at high pressure is negative,and the curve of isothermal adsorption curve decreases with the increase of pressure in most cases.In order to correctly explain this phenomenon,this study selected various shale samples from standard samples of international inter-laboratory comparison (e.g.Kimmeridge shale,Posidonia shale),Longmaxi Formation in Silurian in Sichuan basin and Ordovician in Tarim Basin.Isothermal adsorption experiments on shale and numerical error analysis are performed.Results show that equation of state (EOS),void volume,pressure sensor accuracy and blank test are identified as major factors to affect the accurate measurement of gas adsorption capacity on shale.In the EOS,the Se-W equation is the most suitable for the calculation of the methane adsorption capacity of the shale,and the second is the S-R-K equation.P-R equation is the worst.Adsorption capacity of shale is negatively related with void volume.The void volume has an error that measurement value is larger than real,which would result in reducing adsorption capacity of the shale.In the condition of high pressure,the effect of void volume error on the adsorption quantity is more serious.Comparison with the temperature sensor,the influence of pressure sensor accuracy on the shale methane adsorption capacity is more prominent.The adsorption capacity test accuracy and stability of measurement system with 10-4 precision pressure sensor superior to that with 10-3 precision pressure sensor.In addition,the test adsorption capacity of the shale which is not corrected by the blank test is usually lower than the actual adsorption capacity,and possibly leads to negative values of adsorption.

Key words: Shale gas, Isotherm sorption, Gas content, Affecting factors, Correction method

中图分类号: 

  • TE132.2

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