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2024年美国比较好的公立大学有哪些

是丫丫呀3个月前 (06-27)阅读数 3#大学排名
文章标签比较好

美国排名前100的公立大学如下:

1 University of California -Berkeley加州大学伯克利分校 Berkeley, CA

2 University of California -Los Angeles加州大学洛杉矶分校 Los Angeles, CA

2 University of Virginia弗吉尼亚大学  Charlottesville, VA

4 University of Michigan- Ann Arbor密西根大学安娜堡分校Ann Arbor, MI

5 the University of North Carolina-Chapel Hill北卡罗来纳大学教堂山分校Chapel Hill, NC

6 College of William and Mary威廉玛丽学院Williamsburg, VA

7 Georgia Institute of Technology佐治亚理工学院Atlanta, GA

8 Pennsylvania State University宾州州立大学–University Park University Park, PA

9 University of California-Davis加州大学戴维斯分校Davis, CA

9 University of California San Diego加利福尼亚大学圣地亚哥分校学校La Jolla, CA

11 University of California Santa Barbara加州大学圣塔芭芭拉分校学校Santa Barbara, CA

11 University of Illinois-Urbana Champaign伊利诺伊大学香槟分校Champaign, IL

11 University of Wisconsin-Madison威斯康星大学麦迪逊分校Madison, WI

14 University of California Berkeley加州大学欧文分校Irvine, CA

14 University of Florida佛罗里达大学Gainesville, FL

16 The Ohio State University-Columbus俄亥俄州立大学哥伦布分校–Columbus Columbus, OH

16 University of Texas-Austin德克萨斯大学奥斯汀分校Austin, TX

16 University of Washington华盛顿大学Seattle, WA

19 University of Connecticut康涅狄格大学Storrs, CT

20 The University of Georgia佐治亚大学Athens, GA

21 Clemson University克莱姆森大学Clemson, SC

21 University of Maryland -Park马里兰大学帕克分校–College Park College Park, MD

21 The University of Pittsburgh匹兹堡大学Pittsburgh, PA

24 Purdue University-West Lafayette普渡大学西拉法叶校区West Lafayette, IN

25 Rutgers the State University of New Jersey--New Brunswick罗格斯大学新伯朗士威校区Piscataway, NJ

25 Texas A&M University德州A&M大学–College Station College Station, TX

25 University of Minnesota- Twin Cities明尼苏达大学双城Minneapolis, MN

25 Virginia Tech Blacksburg, VA

29 Michigan State University密歇根州立大学East Lansing, MI

29 The University of Iowa爱荷华大学Iowa City, IA

31 Indiana University-Bloomington印地安纳大学伯明顿分校Bloomington, IN

31 Miami University迈阿密大学–Oxford Oxford, OH

31 University of Delaware Newark, DE

34 Stony Brook University-SUNY纽约州立大学石溪分校Stony Brook, NY

34 The University of Vermont佛蒙特大学Burlington, VT

36 SUNY College of Environmental Science and Forestry纽约州立大学环境科学与林业学院Syracuse, NY

36 The University of Alabama阿拉巴马大学Tuscaloosa, AL

36 University of California-Santa Cruz加州大学圣克鲁兹分校Santa Cruz, CA

36 University of Colorado-Boulder科罗拉多大学波尔得分校Boulder, CO

40 Auburn University奥本大学Auburn University奥本大学, AL

40 Colorado School of Mines科罗拉多矿业大学Golden, CO

40 Florida State University佛罗里达州立大学Tallahassee, FL

40 University of Massachusetts-Amherst马萨诸塞大学Amherst校区Amherst, MA

44 Binghamton University-SUNY纽约州立大学宾汉姆顿大学Binghamton, NY

44 University of Missouri密苏里大学Columbia, MO

44 University of New Hampshire新罕布什尔大学Durham, NH

47 Iowa State University爱荷华州立大学Ames, IA

47 North Carolina State University,Raleigh北卡罗来纳州立大学–Raleigh Raleigh, NC

47 The University of Kansas堪萨斯大学Lawrence, KS

47 University of Nebraska-Lincoln内布拉斯加大学林肯分校Lincoln, NE

47 University of Oklahoma俄克拉荷马大学Norman, OK

47 University of Tennessee田纳西大学Knoxville, TN

53 University at Buffalo-SUNY纽约州立大学水牛城分校学校Buffalo, NY

53 University of Oregon俄勒冈大学Eugene, OR

55 University of California-Riverside加州大学河滨分校Riverside, CA

55 University of South Carolina Columbia南卡罗来纳大学哥伦比亚分校Columbia, SC

57 Michigan Technological University密歇根理工大学Houghton, MI

58 The University of Arizona亚利桑那大学Tucson, AZ

58 University of Kentucky肯塔基大学Lexington, KY

60 Colorado State University科罗拉多州立大学Fort Collins, CO

60 Temple University天普大学Philadelphia, PA

60 The University of Utah犹他大学Salt Lake City, UT

63 Missouri University of Science and Technology密苏里大学理工学院Rolla, MO

63 University at Albany–SUNY Albany, NY

63 University of Arkansas阿肯色大学Fayetteville, AR

63 University of Illinois-Chicago伊利诺大学芝加哥校区Chicago, IL

63 Washington State University华盛顿州立大学Pullman, WA

68 Kansas State University堪萨斯州立大学Manhattan, KS

68 Louisiana State University-Baton Rouge路易斯安那州立大学Baton Rouge, LA

68 Ohio University俄亥俄大学Athens, OH

68 University of Cincinnati辛辛那提大学Cincinnati, OH

72 George Mason University乔治梅森大学Fairfax, VA

73 Arizona State University亚利桑那州立大学Tempe, AZ

73 Mississippi State University Mississippi State, MS

73 Oklahoma State University俄克拉荷马州立大学Stillwater, OK

73 Oregon State University俄勒冈州立大学Corvallis, OR

73 Rutgers,the State University of New Jersey--Newark罗格斯,新泽西州立大学——纽瓦Newark, NJ

73 The University of Texas-Dallas德克萨斯大学达拉斯分校Richardson, TX

79 New Jersey Institute of Technology新泽西理

79 University of Mississippi密西西比大学University, MS

81 Illinois State University Normal, IL

81 San Diego State University圣地亚哥州立大学San Diego, CA

81 The University of Alabama阿拉巴马大学–Birmingham Birmingham, AL

81 University of Rhode Island罗德岛大学Kingston, RI

85 University of Hawaii-Manoa夏威夷马诺大学Honolulu, HI

85 University of Maryland -Park马里兰大学帕克分校–Baltimore County Baltimore, MD

85 University of Massachusetts–Lowell马萨诸塞大学卢维尔分校Lowell, MA

88 Texas Tech University德州理工大学Lubbock, TX

88 University of Idaho爱达荷大学Moscow, ID

88 University of Louisville路易斯维尔大学Louisville, KY

88 University of Wyoming怀俄明大学Laramie, WY

92 University of Maine at Orono缅因大学Orono, ME

92 Virginia Commonwealth University弗吉尼亚联邦大学Richmond, VA

94 University of Central Florida中佛罗里达大学Orlando, FL

94 University of South Florida南佛罗里达大学Tampa, FL

94 West Virginia University西弗吉尼亚大学Morgantown, WV

97 University of North Dakota北达科他大学Grand Forks, ND

98 Indiana University of Pennsylvania宾夕法尼亚大学Indiana, PA

98 Northern Illinois University北伊利诺伊大学DeKalb, IL

98 Southern Illinois University-Carbondale南伊利诺伊卡本代尔大学Carbondale, IL

致密页岩吸附解吸性能评价研究

每个学校的要求不一样的,有的要求作品集,有的要求托福也有的要求雅思。你最好根据自己的需求查一下,因为要去还是要真的学到东西吧,否则太便宜,也没有什么意义。其次,每个学校都有自己的奖学金,你要申请奖学金成功学费不是问题,一般的学校学费我做过调查,全美艺术类排名第一的罗德岛一年3万8美金一年,第二的耶鲁2万6一年。好好准备吧,还是申请个好的学校,有奖学金就不要怕,以下是全美的艺术类大学排名,希望你有用

排名 学校名称 所在地 1 Rhode Island School of Design Providence, RI 2 Yale University New Haven, CT 3 School of the Art Institute of Chicago Chicago, IL 4 Cranbrook Academy of Art Bloomfield Hills, MI 4 Maryland Institute College of Art Baltimore, MD 4 Virginia Commonwealth University Richmond, VA 7 California Institute of the Arts Valencia, CA 7 Carnegie Mellon University Pittsburgh, PA 7 University of California--Los Angeles Los Angeles, CA 10 Alfred University--New York State College of Ceramics Alfred, NY 11 Art Center College of Design Pasadena, CA 11 California College of the Arts San Francisco, CA 11 Columbia University New York, NY 14 Temple University Elkins Park, PA 15 Bard College Annandale-on-Hudson, NY 15 Pratt Institute Brooklyn, NY 15 School of Visual Arts New York, NY 15 University of California--San Diego La Jolla, CA 15 University of Texas--Austin Austin, TX 15 Washington University in St. Louis Saint Louis, MO 21 CUNY--Hunter College New York, NY 21 New School--Parsons School of Design New York, NY 21 Ohio State University Columbus, OH 21 Otis College of Art and Design Los Angeles, CA 21 Rochester Institute of Technology Rochester, NY 21 University of California--Davis Davis, CA 21 University of Illinois--Urbana-Champaign Champaign, IL 21 University of Iowa Iowa City, IA 21 University of Wisconsin--Madison Madison, WI 30 Arizona State University Tempe, AZ 30 Indiana University--Bloomington (Hope) Bloomington, IN 30 Massachusetts College of Art Boston, MA 30 New York University New York, NY 30 Rutgers, the State University of New Jersey--New Brunswick New Brunswick, NJ 30 San Francisco Art Institute San Francisco, CA 30 University of California--Berkeley Berkeley, CA 37 Minneapolis College of Art and Design Minneapolis, MN 37 Tufts University/School of the Museum of Fine Arts--Boston Boston, MA 37 University of Georgia Athens, GA 37 University of Illinois--Chicago Chicago, IL 37 University of Michigan Ann Arbor, MI 37 University of Southern California Los Angeles, CA 37 University of Washington Seattle, WA 37 University of the Arts Philadelphia, PA 45 Herron School of Art & Design Indianapolis, IN 45 Stanford University Stanford, CA 45 University of Arizona Tucson, AZ 45 University of Cincinnati Cincinnati, OH 45 University of Pennsylvania Philadelphia, PA 50 Claremont Graduate University Claremont, CA 50 Cleveland Institute of Art Cleveland, OH 50 Cornell University Ithaca, NY 50 Syracuse University Syracuse, NY 50 University of Minnesota--Twin Cities Minneapolis, MN 50 University of New Mexico Albuquerque, NM 50 University of Tennessee--Knoxville Knoxville, TN 58 Boston University Boston, MA 58 California State University--Long Beach Long Beach, CA 58 California State University--Los Angeles Los Angeles, CA 58 Mills College Oakland, CA 58 Ohio University Athens, OH 58 Pennsylvania Academy of the Fine Arts Philadelphia, PA 58 Rensselaer Polytechnic Institute Troy, NY 58 SUNY--Purchase College Purchase, NY 58 San Diego State University San Diego, CA 58 Southern Illinois University--Carbondale Carbondale, IL 58 University of California--Irvine Irvine, CA 58 University of California--Santa Barbara Santa Barbara, CA 58 University of Chicago Chicago, IL 58 University of Colorado--Boulder Boulder, CO 58 University of Florida Gainesville, FL 58 University of Kansas Lawrence, KS 58 University of North Carolina--Chapel Hill Chapel Hill, NC 58 University of North Texas Denton, TX 76 Columbia College Chicago, IL 76 Florida State University Tallahassee, FL 76 Louisiana State University Baton Rouge, LA 76 Northwestern University Evanston, IL 76 University at Buffalo--SUNY Buffalo, NY 81 CUNY--Brooklyn College Brooklyn, NY 81 Maine College of Art Portland, ME 81 New York Studio School New York, NY 81 Northern Illinois University DeKalb, IL 81 SUNY--Stony Brook Stony Brook, NY 81 San Jose State University San Jose, CA 81 University of Delaware Newark, DE 81 University of Maryland--College Park College Park, MD 81 University of Massachusetts--Amherst Amherst, MA 81 University of Nevada--Las Vegas Las Vegas, NV 81 University of Oregon Eugene, OR 81 University of South Florida Tampa, FL 93 CUNY--City College New York, NY 93 CUNY--Queens College Flushing, NY 93 Clemson University Clemson, SC 93 George Mason University Fairfax, VA 93 Iowa State University Ames, IA 93 SUNY--New Paltz New Paltz, NY 93 San Francisco State University San Francisco, CA 93 Southern Methodist University Dallas, TX 93 University of Connecticut Storrs, CT 93 University of Houston Houston, TX 93 University of Nebraska--Lincoln Lincoln, NE 93 University of Wisconsin--Milwaukee Milwaukee, WI 93 West Virginia University Morgantown, WV 106 American University Washington, DC 106 Kent State University Kent, OH 106 Memphis College of Art Memphis, TN 106 Miami University--Oxford Oxford, OH 106 New York Academy of Art New York, NY 106 SUNY--Albany Albany, NY 106 Tulane University New Orleans, LA 106 University of Massachusetts--Dartmouth North Dartmouth, MA 106 University of Montana Missoula, MT 106 University of Notre Dame Notre Dame, IN 106 University of Texas--San Antonio San Antonio, TX 106 University of Utah Salt Lake City, UT 106 Wayne State University Detroit, MI 119 California State University--Fullerton Fullerton, CA 119 California State University--Northridge Northridge, CA 119 George Washington University Washington, DC 119 Georgia State University Atlanta, GA 119 Kansas State University Manhattan, KS 119 Michigan State University East Lansing, MI 119 Montana State University Bozeman, MT 119 Texas Tech University Lubbock, TX 119 University of Hawaii--Manoa Honolulu, HI 119 University of Maryland--Baltimore County Baltimore, MD 119 University of Miami Coral Gables, FL 119 University of North Carolina--Greensboro Greensboro, NC 119 Utah State University Logan, UT 119 Vermont College of Fine Arts/Union Institute and University Montpelier, VT 119 Washington State University Pullman, WA 134 Bowling Green State University Bowling Green, OH 134 Bradley University Peoria, IL 134 Brigham Young University Provo, UT 134 Colorado State University Fort Collins, CO 134 East Carolina University Greenville, NC 134 Illinois State University Normal, IL 134 Indiana State University Terre Haute, IN 134 James Madison University Harrisonburg, VA 134 Lesley University Cambridge, MA 134 New York School of Interior Design New York, NY 134 Portland State University Portland, OR 134 Purdue University West Lafayette, IN 134 Savannah College of Art and Design Savannah, GA 134 University of Missouri--Columbia Columbia, MO 134 University of Oklahoma Norman, OK 134 University of South Carolina Columbia, SC

孙仁远1,2 张召召1 熊启勇3 胡新玉4 李泌5 傅钺1

(1.中国石油大学(华东)石油工程学院,山东青岛 266555; 2.中国石油大学(北京)石油工程学院,北京昌平 102249; 3.新疆油田公司采油工艺研究院 新疆克拉玛依 834000; 4.新疆油田公司风城油田作业区 新疆克拉玛依 834001; 5.新疆油田公司石西油田作业区,新疆克拉玛依 834001)

摘 要:页岩气是一种非常规天然气能源,主体上以吸附态和游离相同时赋存于具有生烃能力的泥页岩 地层中。美国在页岩气开发上取得巨大成功,使人们有理由相信页岩气将成为未来常规油气资源的重要接替 者。页岩气的吸附性是页岩的特性之一,页岩的吸附解吸性能评价对页岩气的开发十分重要。采用自行设计 的页岩等温吸附解吸实验装置,研究了页岩中甲烷、二氧化碳、氮气等气体的吸附解吸特性。结果表明,随 压力的增加,气体在页岩中的吸附量增加。25℃时,甲烷在1MPa的平衡压力下吸附量是0.85cm3/g,平衡压 力增加到10MPa时,吸附量增加到4.85cm3/g;不同气体在页岩中的吸附能力不同。甲烷、二氧化碳、氮气 在页岩中的吸附性强弱依次是二氧化碳大于甲烷,甲烷大于氮气。采用同一个页岩样品,在25℃、平衡压力 为5MPa时,氮气,甲烷、二氧化碳的吸附量依次是0.45cm3/g、1.40cm3/g、6.14cm3/g。甲烷和二氧化碳在 页岩中甲烷、二氧化碳在页岩中吸附规律基本符合Langmuir方程,可以用Langmuir模型预测页岩气在页岩中 的吸附;随压力降低,甲烷解吸量增大,在压力较低时,解吸曲线变化较为平缓,压力较高时,曲线下降 变陡,解吸量较低压下增幅变大,气体在页岩中的解吸存在一定的解吸滞后效应;不同的页岩样品吸附性 不同。

关键词:页岩气;吸附;解吸

Adsorption and Desorption Property Evaluations of Gases in Tight Shales

Sun Renyuan1,2,Zhang Zhaozhao1,Xiong Qiyong3,Hu Xinyu4,Li Mi5,Fu Yue1

(1.School of Petroleum Engineering,China University of Petroleum,Qingdao 266555,China; 2.College of Petroleum Engineering,China University of Petroleum,Changping 102249,China; 3.Institute of Oil Production Technology,Xinjiang Oilfield Company,Kelamayi 834000,China; 4.Fengcheng Oil Production Zone,Xinjiang Oilfield Company,Kelamayi 834001,China; 5.Shixi Oil Production Zone,Xinjiang Oilfield Company,Kelamayi 834001,China)

Abstract:Shale gas is an unconventional natural gas,mainly stored as a condensed phase on the shale matrix and organic materials.as well as free gas in the porous space.The great success on shale gas development make people believe that shale gas will offset the deficiency of conventional oil and gas.The adsorption of shale gas on shale is one of properties of shale.Adsorption and desorption property evaluations in Shales is very important for shale gas development.A self-designed laboratory apparatus was used for determining the adsorption and desorption properties of CH4,CO2,N2 in shales.Experiments show that gas can be absorbed in shales.The adsorption increases with the increasing of equilibrium pressure.When the temperature is 25℃and the equilibrium pressure is 1MPa,the adsorption of methane is 0.85cm3/g.As the pressure increases to 10MPa,the adsorption become to 4.85cm3/g.The adsorption is different with different gas.The adsorption ability of CO2 in shales is larger than CH4,and the adsorption ability of CH4 is greater than N2.When the temperature is 25℃and the equilibrium pressure is 5MPa,the adsorption of methane,nitrogen and carbon dioxide is 0.45cm3/g,1.4cm3/g and 6.14cm3/g,respectively.The adsorption of CH4 and CO2 can be described by Langmuir model.The desorption increases with the reducing of equilibrium pressure.When the pressure is relatively low,the desorption is small.On the contrast,The desorption become faster when the pressure is relatively high.There are hysteresis effect when gas begin to be desorpted.The adsorption ability of gas in shales is different with different samples.

Key words:shale gas;adsorption;desorption

引言

页岩气是从页岩层中生产出来的一种非常规天然气[1~3]。气体在页岩中主要以溶解态、游离 态、吸附态存在,页岩中吸附气的含量约占总含气量的50%[4~9]。H.S Lane等[10]从试井数据中 分析页岩气藏中气体解吸参数、监测和估算气体解吸量。E.Shtepani,等[11]研究了解吸罐测定吸 附气含量、气体组成和总的解吸时间,提出了一种精确估算损失气量,从而估算原始地质储量的 方法。Daniel J.K.等[12]研究了页岩组成和孔隙结构对气体吸附的影响,得出甲烷吸附量随TOC 及微孔体积的增加而增大的结论。Ross等[13]研究得出页岩中甲烷吸附量与TOC正相关,页岩中 硅铝酸盐中存在纳米级孔隙[14~18],对甲烷的吸附能力有重要影响。Chamelers[17]研究得出了白 垩系页岩甲烷吸附量随微孔体积的增加而增大。Xiao-chun Lu等[19]研究了泥盆系页岩吸附影响 因素,得出有机质、粘土含量、压力温度是影响页岩吸附的主要因素,但没有研究气体在页岩 中的解吸性质。页岩气的吸附解吸性质对页岩气的压裂增产和产量预测等具有重要的意义[10]。

采用自行设计的实验装置,测定了高压和室温下甲烷、二氧化碳、氮气在页岩中的等温吸附曲线。应用朗格缪尔方程[19]对曲线进行拟合,并分析了影响页岩吸附解吸性能的因素,为进一步研究页岩气 吸附解吸机理鉴定了基础。

1 实验材料及设备

1.1 实验材料

页岩样品(粉碎、过筛,颗粒直径为60~230目)。甲烷气体(瓶装,纯度为99.99%);二氧 化碳气体(瓶装,纯度为99.99%);氮气气体(瓶装,纯度99.99%);氦气(瓶装,纯度 为99.99%)。

1.2 实验设备

自行研制的页岩吸附解吸性能评价装置如图1、图2所示。它主要包括真空泵、样品室、标准室、 高压气瓶等。

图1 页岩吸附性能评价系统示意图

图2 页岩解吸性能评价系统示意图

2 实验方法与步骤

2.1 模型制备

将现场取心得到的页岩样品粉碎、筛分、烘干、填装、压实,即得到实验用的页岩样品,其基本参 数见表1。

2.2 气体吸附性能评价步骤

(1)连接仪器,检查气密性。

(2)打开真空泵对系统抽真空。

(3)关闭样品室阀门7,打开阀门3、5,向标准室充入实验气体,关闭阀门3,记录压力 为P1(1)。

(4)打开阀门5,待标准室和样品室压力平衡后记录平衡压力之值P2(1)。

(5)关闭阀门7,打开阀门3,向标准室继续充入气体至P1(2),关闭阀门3,重复步骤4。

(6)重复步骤5直至实验压力P1(n)。

表1 页岩样品基本参数

2.3 气体解吸性能评价步骤

(1)连接好仪器,将气体最后一次吸附平衡的压力记为P2(1)。

(2)关闭样品室阀门5,降低标准室压力,记录此时的标准室压力P1(1)。

(3)待压力稳定后打开样品室阀门5,待样品室和标准室压力平衡后记录平衡压力值P2(2)。

(4)重复步骤2和3,直至标准室压力降为大气压。

3 实验结果及讨论

3.1 气体吸附、解吸量计算公式

应用真实气体状态方程,将吸附平衡后的体积换算到标准状态下的气体体积。可以得到气体吸附 量。第一个吸附平衡压力P2所对应的吸附气体积为:

国际非常规油气勘探开发(青岛)大会论文集

式中:P1为第一次向标准室中注入气体的压力,MPa;P2为样品室第一个吸附平衡压力,MPa;Psc为 标准大气压,MPa;Vh为标准室体积,m3 ;Vφ为样品室孔隙体积,m3 ;Z1、Z2分别为压力P1和P2 对应的真实气体压缩系数。

第n个吸附平衡压力点P2(n)对应的气体吸附体积:

国际非常规油气勘探开发(青岛)大会论文集

气体吸附量:

国际非常规油气勘探开发(青岛)大会论文集

式中,m为样品质量,kg。

气体解吸量:

国际非常规油气勘探开发(青岛)大会论文集

式中,Q解为甲烷解吸量,m3/kg;V为甲烷解吸体积,m3。

3.2 页岩吸附等温线测定

在25℃条件下,测量了甲烷气体在页岩样品SN121中的 吸附等温线,实验结果如图3所示。从图3中可以看出,甲 烷的吸附量随压力升高而增大,压力影响气体吸附能力。在 平衡压力为10.99MPa时,岩样品的吸附量可达4.85cm3/g。

3.3 不同气体在页岩中的吸附实验结果及讨论

图3 25℃时SN121页岩样品 甲烷吸附等温线

实验分别测定了25℃条件下,甲烷、二氧化碳在同一种 页岩样品中的吸附性能,实验结果如图4所示。由图可见,在25℃和5.08MPa下,CH4、CO2在页岩SN121中的吸附气 量分别是3.39cm3/g、10.65cm3/g,二氧化碳在页岩中的吸附能力大约是甲烷的3倍,表明二氧化碳对 页岩的吸附能力大于甲烷。而且,甲烷和二氧化碳吸附规律都基本符合Langmuir等温吸附方程。Langmuir方程的拟合参数如表2所示。

表2 Langmuir方程拟合参数

图4 25℃条件下SN121页岩甲烷、二氧化碳等温 吸附线及Langmuir拟合曲线

3.4 页岩吸附解吸曲线测量结果及讨论

选取两种不同的页岩样品SN3、SN121进行 了甲烷吸附解吸等温实验,结果如图5和图6 所示。

由图5可见,甲烷在页岩样品中的吸附曲线 和解吸曲线并不重合,说明气体在页岩中吸附和 解吸在机理上存在明显差异,存在一定的滞后 效应。

由图6可见,随着压力的降低,甲烷的解吸 量增大,在压力较高时,曲线下降变陡,解吸量 较低压下增幅变大,压力越低,解吸量变化变 缓。当压力从11.46MPa降低到8.32MPa,解吸 量是2.46cm3/g;压力从3.24MPa降低到 0.14MPa,解吸量是1.17cm3/g。高压下解吸量较大,说明快速降低地层压力有利于促进甲烷在页岩中 的解吸。

图5 25℃条件下,SN3、SN121页岩样品 甲烷吸附解吸等温线

图6 25℃条件下SN3页岩样品 甲烷解吸等温线

4 结论

(1)在等温条件下,页岩吸附甲烷的量随压力增加而增大,在低压时吸附量随压力增加较快,当压 力增大到一定值后,吸附量增加变缓。

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(2)二氧化碳在页岩中吸附能力大于甲烷。

(3)甲烷、二氧化碳在页岩中吸附规律基本符合Langmuir方程,因而可以用Langmuir模型预测页 岩气在页岩中的吸附。

(4)随压力降低,甲烷解吸量增大,在压力较低时,解吸曲线变化较为平缓;压力较高时,曲线下 降变陡,解吸量较低压下增幅变大。甲烷解吸曲线与其吸附曲线不重合。

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