摘要
为了研究高温高压条件下深部页岩的吸附特性,选取黔北和黔东南牛蹄塘组黑色页岩在压力为0~35 MPa、温度为60~80℃条件下进行等温吸附实验。研究发现:页岩对甲烷的等温吸附曲线在高温高压条件下具有明显的峰值,温度越低峰值出现得越早;峰值出现前,温度越低对吸附的影响越大,曲线符合Ⅰ型吸附曲线特性;峰值出现后,温度越高对吸附的影响越大,吸附量随压力的升高呈缓直线下降趋势,温度越高下降得越快,主要原因是样品孔隙结构的破坏和分子间作用力的变化。研究成果对深部页岩气的评估和开采具有重要的理论和实践指导意义。
To investigate the adsorption characteristics of deep shale under high temperature and high pressure,isothermal adsorption experiments were carried out on Niutitang Formation black shale taken from north and southeast of Guizhou under the pressure of 0-35 MPa and temperature of 60-80 ℃. It is indicated that an obvious peak emerges on the shale-to-methane isothermal adsorption curve under high temperature and high pressure. The lower the temperature is,the earlier the peak emerges. Before the peak emerges,the lower the temperature is,the more it affects the adsorption. This curve is in accordance with the characteristics of type I adsorption curve. After the peak emerges,the higher the temperature is,the more it affects the adsorption. The adsorption volume diminishes linearly with the increasing of pressure. The higher the temperature is,the faster the decline is. The reasons for this phenomenon are the deterioration of pore structures in samples and the change of intermolecular force. The research results are theoretically and practically significant to the evaluation and exploitation of deep shale gas.
作者
李希建
李维维
黄海帆
沈仲辉
Li Xijian Li Weiwei Huang Haifan Shen Zhonghui(Guizhou University, Guiyang, Guizhou 550025, China Engineering Center for Safe Mining under Complex Geologic Condition, Guiyang, Guizhou 550025, China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第3期129-134,共6页
Special Oil & Gas Reservoirs
基金
贵州省重大应用基础研究项目"贵州复杂构造区页岩气赋存与渗透机制研究"( 黔科合 JZ 字[2014]2005)
贵州省教育厅项目"复杂地质矿山开采安全技术中心"( 黔教合KY字(2013)112)
贵州大学矿业学院创新基金"页岩中CH_4
N_2
CO_2及其混合气体吸附特性实验研究"( 院研201606103)
关键词
页岩气
深部页岩
吸附特性
高温高压
等温吸附曲线
曲线峰值
shale gas
deep shale
adsorption characteristic
high temperature and high pressure
isothermal adsorption curve
peak of the curve
