页岩吸附能力与温度的关系及吸附模型比较
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摘要
页岩的吸附能力是评价页岩储层的关键参数。选取渝东南地区龙马溪组的页岩样品,利用磁悬浮称重法测量其甲烷吸附能力;使用非线性拟合方法模拟页岩的等温吸附曲线,得到不同温度下页岩的吸附差异;利用扫描电镜观察页岩的孔隙结构特征,综合分析温度对孔隙结构与页岩吸附能力的影响。测试结果发现,页岩的吸附能力受温度影响较大,随着温度的增加,页岩的吸附量下降明显。对比拟合结果表明,考虑了温度影响的指数模型比经典的Langmuir模型有更好的拟合效果。计算页岩吸附能力时应当考虑温度的影响。
The adsorption capacity of shale is the key parameter for evaluating shale reservoirs. Taking the shale samples of Longmaxi Formation in the southeastern Chongqing as an example,the adsorption capacity of shale is measured by magnetic suspension weighing method. The isotherm adsorption curve of shale is simulated by nonlinear fitting method to obtain the adsorption difference of shale at different temperatures. The pore structure characteristics of shale are observed by scanning electron microscopy( SEM) and the effects of temperature on pore structure and shale adsorption capacity are analyzed. The experiments show that the adsorption capacity of shale is greatly affected by temperature and as the temperature increases,the amount of adsorbed gas decreases obviously. Comparative fitting results show that the improved exponential model has a better fitting result than the classical Langmuir isotherm,indicating that the temperature influence needs to be considered when calculating the shale adsorption capacity.
The adsorption capacity of shale is the key parameter for evaluating shale reservoirs. Taking the shale samples of Longmaxi Formation in the southeastern Chongqing as an example,the adsorption capacity of shale is measured by magnetic suspension weighing method. The isotherm adsorption curve of shale is simulated by nonlinear fitting method to obtain the adsorption difference of shale at different temperatures. The pore structure characteristics of shale are observed by scanning electron microscopy( SEM) and the effects of temperature on pore structure and shale adsorption capacity are analyzed. The experiments show that the adsorption capacity of shale is greatly affected by temperature and as the temperature increases,the amount of adsorbed gas decreases obviously. Comparative fitting results show that the improved exponential model has a better fitting result than the classical Langmuir isotherm,indicating that the temperature influence needs to be considered when calculating the shale adsorption capacity.
引文
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[2]寇雨,周文,赵毅楠,等.鄂尔多斯盆地长7油层组页岩吸附特征与类型及吸附气量影响因素[J].岩性油气藏,2016,28(6):52-57.
[3] HAO F,ZOU H Y,LU Y C. Mechanisms of Shale Gas Storage:Implications for Shale Gas Exploration in China[J]. AAPG Bulletin,2013,97(8):1325-1346.
[4]熊伟,郭为,刘洪林,等.页岩的储层特征以及等温吸附特征[J].天然气工业,2012,32(1):113-116.
[5]郭为,熊伟,高树生,等.温度对页岩等温吸附/解吸特征影响[J].石油勘探与开发,2013,40(4):481-485.
[6]周尚文,薛华庆,郭伟,等.页岩气超临界吸附研究进展[J].科技导报,2017,35(15):63-69.
[7] LU X,LI F,WATSON A T. Adsorption Studies of Natural Gas Storage in Devonian Shales[J]. SPE Formation Evaluation,1995,10(2):109-113.
[8] YE Z H,CHEN D,PAN Z J,et al. An Improved Langmuir Model for Evaluating Methane Adsorption Capacity in Shale Under Various Pressures and Temperatures[J]. Journal of Natural Gas Science and Engineering,2016,31:658-680.
[9] JI L M,ZHANG T W,MILLIKEN K L,et al. Experimental Investigation of Main Controls to Methane Adsorption in Clay-Rich Rocks[J]. Applied Geochemistry,2012,27(12):2533-2545.
[10]周文,徐浩,余谦,等.四川盆地及其周缘五峰组-龙马溪组与筇竹寺组页岩含气性差异及成因[J].岩性油气藏,2016(5):18-25.
[11] CAO Q,ZHOU W,DENG H C,et al. Classification and Controlling Factors of Organic Pores in Continental Shale Gas Reservoirs Based on Laboratory Experimental Results[J]. Journal of Natural Gas Science and Engineering,2015,27:1381-1388.