資源描述:
《焦作煤田煤儲層物性特征及控氣因素畢業(yè)論文》由會員上傳分享,免費在線閱讀,更多相關內容在學術論文-天天文庫。
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,我國煤炭資源非常豐富,煤層氣資源量也相當可觀。研究煤儲層的物性特征及含氣性,可以為煤層氣的開發(fā)利用提供借鑒作用,同時也可以減少瓦斯事故的發(fā)生。本文利用搜集的資料和實驗測試結果,研究了焦作煤田主力煤層二1煤層的儲層結構、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合的方式,對煤層含氣性的變化規(guī)律及控制因素進行了探討。研究認為:焦作煤田二1煤層微孔含量最高,其次是過渡孔,而大中孔含量要低得多,具有很強的吸附能力和較強的擴散能力。但滲流或層流能力很弱,煤層滲透率較低,且隨著埋深的增加而
2、減小,但地質構造對煤層滲透性具有一定的影響,并且研究區(qū)內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、斷裂構造對本區(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,增大趨勢變緩,之間具有對數(shù)正相關關系;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;區(qū)域大斷裂帶附近以及多組斷裂的交會部位,煤層含氣量往往較低。關鍵詞:焦作煤田;煤層氣;儲層物性;含氣性;控制因素IIAbstractCoalbedmethanemainlyisakindofcleanenergy
3、whichexistsincoalseaminadsorptionmanner.Coalresourcesareveryabundantinourcountry,thecoalbedmethaneresourcesarealsoconsiderable.Researchingoncoalreservoirphysicalcharacteristicsandgas-bearing,canprovidereferenceforthedevelopmentandutilizationofcoalbedmethane,atthesametimeals
4、ocanreducethegasaccidents.Basedonmeasuresoncoalsamplesandthedata,thepropertyoffractureandporestructure,permeabilityandadsorptionoftheⅡ1coalbedmethanereservoirintheJiaozuocoalfieldweresystematicallystudied.Thegas-bearingchangelawandtheinfluencefactorsongas-bearingpropertiesw
5、erediscussedusingqualitativeandquantitativeanalyses.Thestudyshows,microporesarethemajorpore,transitionalporesarethesecondandmacroporesarefarlessintheⅡ1coal,thusforthekindofcoal,theadsorptioncapacityisveryhighthediffusibilityisalittlestrong,butthecapacityofseepageandlaminarf
6、lowisveryweak.Thepermeabilitycoefficientislowanddecreaseswiththeburialdepthofthecoalbed,andthepermeabilityalsoisinfluencedbythegeo-structureandcanbeimprovedunderhydraulicfracturing.TheroofandflooroftheⅡ1coalbedprovidefavorablegas-preservationconditions,andtheeffectiveburial
7、depthandfaultsstructurearealsothemajorfactorscausinggas-bearingchangeintheⅡ1coal.Theeffectiveburialdepthandgas-contentisinpositivecorrelation.Thegascontentintheaxialpartofthesynclineisgreaterthanthatinthewings,andtherelationistheveryoppositeintheanticlines.Thegascontentisof
8、tenlowneartheregionalfaultsorintheintersectionpartoftheregionalfaults.Keywords:Jia