考虑有机质含量的页岩吸附气含量计算模型及其应用
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中国石油大学(北京) 石油工程学院,中国石油大学(北京) 石油工程学院,中国石油大学(北京) 石油工程学院,中国石油大学(北京) 石油工程学院

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TE155

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中国石油大学(北京)科研基金资助(基金编号为KYJJ2012-02-28)


The calculation model for shale absorption gas content considering the organic content and its application
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    摘要:

    为了对压力、有机质含量对页岩吸附气含量的影响规律进行研究,更准确地对吸附气含量进行估算,基于对吸附类型的讨论,通过在储层温度条件下的等温吸附实验,获得不同有机质含量下的等温吸附特征曲线,并根据Langmuir等温吸附理论得到Langmuir体积和Langmuir压力,分析有机质含量(TOC)对吸附气含量影响特征。在此基础上,利用球状模型和反正切函数形式拟合等温吸附特征以及TOC与吸附气含量的线性关系,建立吸附气含量计算模型,并以四川盆地下志留统龙马溪组3口井的多组岩心样本数据为例,对比岩心刻度后的模型计算结果与解吸气量,对模型的准确性进行验证,结果表明该模型精度较高,相关系数达到93%以上,对页岩吸附气量和含气量评价具有一定的现实指导价值。

    Abstract:

    In order to find out the effect law of pressure and organic content acting on the shale absorption gas content, and estimate the absortption gas content more accuratly, it is essential to conduct isothermal experiment under reservoir temperature to abtain the isothermal absorption characteristic curves with various organic content, and figure up the Langumir volume and Langumir pressure, and analyze the effect law based on the discussion on the absorption type. Then on this basis, absorption gas content calculation model could be estimated by using the spherical model and arctan function form, which can describe the isothermal absorption characteristic well, and the linear relation between TOC and absorption gas content. Finally, the model accuracy can be verified by comparing the model’s calculaiton results after core calibration with desorption content, by using a few core sample data of 3 wells in Longmaxi Formation, Lower Silurian series, Sichuan Basin. It turns out that the correaltion coefficient would be more than 93%, which indicates the model accuracy is relatively high. The research would have a certain practical guiding gignificance for shale absorption content and total gas content estimation.

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王建国,李忠刚,朱智,等. 考虑有机质含量的页岩吸附气含量计算模型及其应用[J]. 科学技术与工程, 2014, 14(22): .
Wang Jian-guo, Li Zhong-gang, Zhu Zhi, et al. The calculation model for shale absorption gas content considering the organic content and its application[J]. Science Technology and Engineering,2014,14(22).

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  • 收稿日期:2014-03-24
  • 最后修改日期:2014-05-08
  • 录用日期:2014-04-18
  • 在线发布日期: 2014-08-15
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