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低階煤孔隙特征與解吸規(guī)律研究

發(fā)布時間:2017-01-02 15:07

  本文關(guān)鍵詞:低階煤孔隙特征與解吸規(guī)律研究,由筆耕文化傳播整理發(fā)布。


西安科技大學

碩士學位論文

低階煤孔隙特征與解吸規(guī)律研究

姓名:喬軍偉

申請學位級別:碩士

專業(yè):礦產(chǎn)普查與勘探

指導教師:馬東民

20090513

論文題目:低階煤孔隙特征與解吸規(guī)律研究

專業(yè):礦產(chǎn)普查與勘探

碩士生:喬軍偉

指導教師:馬東民(簽名)盎墾經(jīng)(簽名)坦型

摘要

目前我國煤層氣勘探開發(fā)主要集中在中、高階煤地區(qū),低階煤煤層氣的勘探和開發(fā)技術(shù)及相應的研究十分薄弱。我國的低階煤(RoS0.65%)分布十分廣泛,以新疆、內(nèi)蒙、陜西、青海、寧夏為主。由于低階煤的孔隙結(jié)構(gòu)與中、高階煤有較大的差異,煤層氣的吸附和解吸特性具有不同于中、高階煤的特點,同時由于采煤活動頻度增強,礦井瓦斯成為這些礦區(qū)最大的安全隱患,有必要對現(xiàn)階段我國低階煤煤層氣開發(fā)區(qū)進行解吸特性的深入認識。

對低階煤煤層氣勘探開發(fā)區(qū)煤層氣解吸特性的認識,要從煤層氣儲層的物性特征分析入手,進行工業(yè)分析、煤巖組分鑒定與煤巖類型劃分、孔隙度測定、掃描電鏡觀察、孔隙分布與孔喉特征的壓汞實驗、比表面積測定與孔容測定的液氮吸附實驗、等溫吸附實驗,在物理性質(zhì)分析的基礎(chǔ)上進行等溫降壓解吸實驗與升溫解吸實驗,揭示煤層氣解吸規(guī)律并歸納數(shù)學模型,為擴散、滲流的深入研究奠定基礎(chǔ)。

通過系統(tǒng)的實驗和分析總結(jié),筆者認為:我國低階煤的孔隙主要由大孔和中孔構(gòu)成,總體上反映出半封閉孔隙和細瓶頸孔隙形態(tài),部分反映出半封閉孔隙的特征,比表面積在5"--'6nm和50"--'60nm兩處顯著分布:低階煤的吸附能力總體低于中、高階煤,,褐煤的吸附能力低于長焰煤,Weibull函數(shù)對低階煤吸附曲線的擬合度最高;低階煤中甲烷的解吸率大多高于中、高階煤,Weibull函數(shù)對低階煤解吸曲線的擬合度最高。最后,分析和總結(jié)了低階煤煤層氣吸附/解吸的影響因素。

關(guān)鍵詞:低階煤:吸附;解吸;Weibull函數(shù)研究類型:理論研究

Subject:ResearchontheLowRankCoalofPoreCharacteristicsand

DesorptionLaws

Specialty:MineralSurvey

:QiaoJunweiandExplorationName(signature)Qi趾j叢△絲}

(signature)Instructor:MaDongrain

ABSTRACT

T11eexplorationandexploitationofcoal—bedmethane(CBM)mainlyconcentratedinmediumrankand11ighrankcoalareapresentlyinChina.It’SveryweaktheexplorationanddevelopmentoflowrankCBMandthecorrespondingresearchtechnique.Lowrankcoal(Ro<O.65%)isveryextensiveinchina,suchasxinjiang,InnerMongolia,shaanxi,ningxia,

differentofmiddleandhigh.ordercoal。The

coalbedqinghai.Theporeadsorptionandstructureoflowrankcoalisdesorption

tocharacteristicsofmethanealsohavedifferentcharacteristics.Due

hiddenminingactivitiesoffrequency,minegasbecamethebiggestsecuritydangerarea.Therefore,itiSnecessarytolow.1eveldesorptioncharacteristicsofcoalin—depthstudy.

InordertostudytheCBMdesorptioncharacteristicsoflowrankcoal,shouldbestudyreservoircharacteristicsfirst.Experimentmainlyincludescoal

typesindustryanalysis,coalrockofcomponents,porositydetermination,scanningelectronmicroscope,mercuryinjectionexperiments(pore

experiment(specificstructureandporecharacteristic),theliquidnitrogenadsorptioncharacteristic),theisothermaladsorptionsurfaceareaandporevolume

experiments.Thenwehavetoanalyzetheexperimentaldataanddotheisothermaldesorptionexperimentandvariabletemperaturedesorptionexperiment,analyzelawsofdesorptionmathematicalmodel.ThisiSthebasic

Throughtheexperimentstoandfurtherstudycharacteristicsofdiffusionandseepage.authorsummarizedtheconclusion.Theporeandanalysis,the

oflowrankcoalismainlyconstitutebybigpore

reflectsemi?closedporeandfineandsecondarypore.Poreformsoverallbottleneckpore,partlyreflectthecharacteristicsofsemi-closedpore.SurfaceiSmainlydistributedinthe5-6nm

abilityoflowrankcoaloverallbelowthemediumrankand50~60nm.Theadsorptionadsorptionandhigtlrankcoal,andthe

aabilityoflignitebelowlong—flamecoal.WbibuUfunctionisfittingfunctionforthe

adsorptioncurvefittingoflowrankcoal.TheCBMdesorptionrateoflowrankcoalishigher

fittingdegreeofthanthemediumrankandhighrankcoal.ThecurveWeibullfunctionisthe

highestforlowrankcoaldesorption.Finally,thepaperanalyzesandsummarizestheCBMadsorption/desorptioninfluencingfactorsofthelowrankcoal.

Keywords:LowrankcoalAdsorptionDesorptionWeibullfunction

Thesis:TheoreticalResearch


  本文關(guān)鍵詞:低階煤孔隙特征與解吸規(guī)律研究,由筆耕文化傳播整理發(fā)布。



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