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《大學(xué)畢業(yè)設(shè)計(jì)---焦作煤田煤儲(chǔ)層物性特征及控氣因素.doc》由會(huì)員上傳分享,免費(fèi)在線(xiàn)閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、摘要煤層氣是一種主要以吸附方式賦存于煤層中的清潔能源,我國(guó)煤炭資源非常豐富,煤層氣資源量也相當(dāng)可觀(guān)。研究煤儲(chǔ)層的物性特征及含氣性,可以為煤層氣的開(kāi)發(fā)利用提供借鑒作用,同時(shí)也可以減少瓦斯事故的發(fā)生。本文利用搜集的資料和實(shí)驗(yàn)測(cè)試結(jié)果,研究了焦作煤田主力煤層二1煤層的儲(chǔ)層結(jié)構(gòu)、滲透性、吸附性等物性特征及分布規(guī)律,采用定性與定量相結(jié)合的方式,對(duì)煤層含氣性的變化規(guī)律及控制因素進(jìn)行了探討。研究認(rèn)為:焦作煤田二1煤層微孔含量最高,其次是過(guò)渡孔,而大中孔含量要低得多,具有很強(qiáng)的吸附能力和較強(qiáng)的擴(kuò)散能力。但滲流或?qū)恿髂芰苋酰簩?/p>
2、滲透率較低,且隨著埋深的增加而減小,但地質(zhì)構(gòu)造對(duì)煤層滲透性具有一定的影響,并且研究區(qū)內(nèi)煤層壓裂處理滲透性可明顯改善;煤層頂、底板巖性為煤層氣體提供了良好的保存條件,而有效埋深、斷裂構(gòu)造對(duì)本區(qū)煤層含氣性具有重要的控制作用。隨著有效埋深的增加,含氣量先是急劇增大,到了一定階段后,增大趨勢(shì)變緩,之間具有對(duì)數(shù)正相關(guān)關(guān)系;向斜軸部煤層氣含量高于兩翼,而背斜則呈現(xiàn)相反的趨勢(shì);區(qū)域大斷裂帶附近以及多組斷裂的交會(huì)部位,煤層含氣量往往較低。關(guān)鍵詞:焦作煤田;煤層氣;儲(chǔ)層物性;含氣性;控制因素IIAbstractCoalbedmet
3、hanemainlyisakindofcleanenergywhichexistsincoalseaminadsorptionmanner.Coalresourcesareveryabundantinourcountry,thecoalbedmethaneresourcesarealsoconsiderable.Researchingoncoalreservoirphysicalcharacteristicsandgas-bearing,canprovidereferenceforthedevelopmentan
4、dutilizationofcoalbedmethane,atthesametimealsocanreducethegasaccidents.Basedonmeasuresoncoalsamplesandthedata,thepropertyoffractureandporestructure,permeabilityandadsorptionoftheⅡ1coalbedmethanereservoirintheJiaozuocoalfieldweresystematicallystudied.Thegas-be
5、aringchangelawandtheinfluencefactorsongas-bearingpropertieswerediscussedusingqualitativeandquantitativeanalyses.Thestudyshows,microporesarethemajorpore,transitionalporesarethesecondandmacroporesarefarlessintheⅡ1coal,thusforthekindofcoal,theadsorptioncapacityi
6、sveryhighthediffusibilityisalittlestrong,butthecapacityofseepageandlaminarflowisveryweak.Thepermeabilitycoefficientislowanddecreaseswiththeburialdepthofthecoalbed,andthepermeabilityalsoisinfluencedbythegeo-structureandcanbeimprovedunderhydraulicfracturing.The
7、roofandflooroftheⅡ1coalbedprovidefavorablegas-preservationconditions,andtheeffectiveburialdepthandfaultsstructurearealsothemajorfactorscausinggas-bearingchangeintheⅡ1coal.Theeffectiveburialdepthandgas-contentisinpositivecorrelation.Thegascontentintheaxialpart
8、ofthesynclineisgreaterthanthatinthewings,andtherelationistheveryoppositeintheanticlines.Thegascontentisoftenlowneartheregionalfaultsorintheintersectionpartoftheregionalfaults.Keywords:Jia