涪陵焦石坝地区页岩气吸附规律研究
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摘要
为研究礁石坝页岩气在产层超临界条件下的吸附规律,利用页岩气等温吸附仪,以礁石坝露头页岩及产层页岩为吸附剂,以甲烷气模拟页岩气作吸附质,测试了不同温度(60℃、70℃、80℃)时,甲烷气吸附量随其压力(2~30 MPa)的变化规律。以过剩吸附量修正亚临界吸附模型(Langmuir、Freundlich、Expand-Langmuir,Langmuir-Freundlich,Toth,B-BET,T-BET,D-R,D-A)为超临界吸附模型,并利用相关系数法优选甲烷气超临界等温吸附最佳模型,阐述了页岩气吸附特征及温度、页岩类型对超临界吸附量的影响。实验结果显示,超临界条件下(温度:60℃~80℃、压力2~30 MPa),产层及露头页岩对甲烷气吸附规律均可用超临界D-A方程进行描述,在实验温度范围60℃~80℃,甲烷气在页岩上的超临界饱和吸附量随温度增高而下降,随页岩中黏土、斜长石含量升高而增大。可知,采用超临界D-A模型描述涪陵礁石坝地区页岩气吸附规律具有较好的准确性。
In order to study the rules of shale gas adsorption under supercritical conditions at JSB area,the shale gas isothermal adsorption apparatus was used for testing,the production shale and the shale outcrop at JSB were used as adsorbents,and methane gas was used as absorbing medium to simulate shale gas,the methane adsorption was tested to find how it changed with pressure( 2 ~ 30 MPa) when at different temperatures( 60℃ 、70℃ 、80℃). Taking the excess adsorption modified subcritical adsorption model( Langmuir、Freundlich、Expand-Langmuir,Langmuir-Freundlich,Toth,B-BET,T-BET,D-R,D-A) as the supercritical adsorption model,and the optimization method of correlation coefficient was used to decide the optimal model of supercritical methane gas adsorption,the effects of methane gas adsorption characteristic,temperature,shale type on supercritical adsorption were expounded. The experimental results show that,under supercritical conditions( temperature: 60℃ ~ 80℃ 、pressure 2 ~ 30 MPa),the rules of methane gas adsorption in the production layer and outcrop shale can be described by the supercritical D-A equation,R2 is greater than 0. 99,and the physical meaning of all parameters in the equation is obvious.And within the experimental temperature range( 60 ~ 80℃),the methane adsorption on the shale will decrease with the increase of temperature,and increase when the clay content and plagioclase content increased. It can be concluded that the supercritical D-A model is rather accurate when describing the rules of shale gas adsorption at JSB area.
In order to study the rules of shale gas adsorption under supercritical conditions at JSB area,the shale gas isothermal adsorption apparatus was used for testing,the production shale and the shale outcrop at JSB were used as adsorbents,and methane gas was used as absorbing medium to simulate shale gas,the methane adsorption was tested to find how it changed with pressure( 2 ~ 30 MPa) when at different temperatures( 60℃ 、70℃ 、80℃). Taking the excess adsorption modified subcritical adsorption model( Langmuir、Freundlich、Expand-Langmuir,Langmuir-Freundlich,Toth,B-BET,T-BET,D-R,D-A) as the supercritical adsorption model,and the optimization method of correlation coefficient was used to decide the optimal model of supercritical methane gas adsorption,the effects of methane gas adsorption characteristic,temperature,shale type on supercritical adsorption were expounded. The experimental results show that,under supercritical conditions( temperature: 60℃ ~ 80℃ 、pressure 2 ~ 30 MPa),the rules of methane gas adsorption in the production layer and outcrop shale can be described by the supercritical D-A equation,R2 is greater than 0. 99,and the physical meaning of all parameters in the equation is obvious.And within the experimental temperature range( 60 ~ 80℃),the methane adsorption on the shale will decrease with the increase of temperature,and increase when the clay content and plagioclase content increased. It can be concluded that the supercritical D-A model is rather accurate when describing the rules of shale gas adsorption at JSB area.
引文
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[2]徐国盛,徐志星,段亮,等.页岩气研究现状及发展趋势[J].成都理工大学学报(自然科学版),2011,14(6):75-76.
[3]Ross D J K,Bustin R M.The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J].Marine and Petroleum Geology,2009,26(6):916-927.
[4]Gasparik M,Ghanizadeh A,Bertier P,et al.High-pressure methane sorption isotherms of blacks form the Netherlands[J].Energy and Fuels,2012,26(8):4995-5004.
[5]Zhang T W,Ellis G S,Ruppel S C,et al.Effect of organicmatter type and thermal maturity on methane adsorption in shale-gas systems[J].Organic Geochemistry,2012,47(6):120-131.
[6]刘圣鑫,钟建华,马寅生,等.页岩中气体的超临界等温吸附研究[J].煤田地质与勘探,2015,43(3):45-50.
[7]张志英,杨盛波.页岩气吸附解吸规律研究[J].实验力学,2012,27(4):492-497.
[8]周理,吕昌忠,王怡林,等.述评超临界温度气体在多孔固体上的物理吸附[J].化学进展,1991,111(3):221-226.
[9]张庆玲,曹利戈.煤的等温吸附测试中数据处理问题研究[J].煤炭学报,2003,28(2):131-135.
[10]熊健,刘向君,梁利喜.页岩中超临界甲烷等温吸附模型研究[J].石油钻探技术,2015,43(3):96-102.
[11]Amankwah K A G,Schwarz J A.A modified approach for estimating pseudo-vapor pressures in the application of the Dubinin-Astakhov equation[J].Carbon,1995,33(9):1313-1319.
[12]Ozawa S,Kusumi S,Ogino Y.Physical adsorption of gases at high pressure,Ⅳ:an improvement of the DubininAstakhov adsorption equation[J].Journal of Colloid and Interface Science,1976,56(1):83-91.
[13]赵龙,秦勇,杨兆彪,等.煤中超临界甲烷等温吸附模型研究[J].天然气地球科学,2014,25(05):753-760.
[14]李笑天,潘仁芳,鄢杰,等.四川盆地长宁—威远页岩气示范区下志留统龙马溪组泥页岩吸附特征及影响因素分析[J].海相油气地质,2016,25(04):60-66.