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1、第23卷第7期中國礦業(yè)VoI_23,No.72014年7月CHINAMININGMAGAZINEJu1.2014地質(zhì)找礦我國低煤階煤層氣成因類型及成藏模式研究侯海海,邵龍義,唐躍,王y,王學(xué)天,劉雙(1_中國礦業(yè)大學(xué)(北京)地球科學(xué)與測繪工程學(xué)院,北京100083;2.中國地質(zhì)調(diào)查局油氣資源調(diào)查中心,北京100029)摘要:基于國內(nèi)外低煤階煤層氣的富集特點和成藏理論的追蹤,對我國低煤階煤層氣的成因類型和成藏模式展開了研究。結(jié)果表明,我國低煤階煤層氣藏成因類型有熱成因、生物成因和混合成因;煤儲層特征包括
2、埋藏淺、含氣量低、厚度大、滲透率高且易改造及與其它油氣共生等特點;前人從巖性、構(gòu)造條件及煤儲層所處位置、水文地質(zhì)條件等對低煤階煤層氣的成藏模式進(jìn)行了劃分?;谝陨涎芯?,認(rèn)為應(yīng)以動態(tài)的觀點來認(rèn)識和探討以有利成煤相帶為煤層氣富集的物質(zhì)基礎(chǔ)、以構(gòu)造體為煤層氣運移壓差和以水動力條件為氣源補給和封蓋的條件的低煤階煤層氣成藏模式。以東北依蘭盆地為例,結(jié)合我國低煤階煤層氣盆地的地質(zhì)特征和前人研究成果,建立了我國低煤階煤層氣的成藏富集模式,即原生成因和次生成因疊合下的斜坡區(qū)成煤優(yōu)勢相帶高富水區(qū)的煤層氣富集模式。關(guān)鍵詞
3、:低煤階;煤層氣;成因類型;成藏模式;動態(tài);優(yōu)勢相帶中圖分類號:P571文獻(xiàn)標(biāo)識碼:A文章編號:1004—4051(2014)07—0066—04StudyoncoalbedmethanegenetictypesandformationmodelsoflowrankcoalinChinaHOUHal—hai,SHAOIong—yi,TANGYue,WANGShuai,WANGXue—tian,LIUShuang(1.SchoolofEarthSciencesandSurveyingEngineerin
4、g,ChinaUniversityofMiningandTechnology(Beijing),Beijing100083,China;2.CenterofOil&GasResourceSurvey,ChinaGeologicalSurvey,Beijing100029,China)Abstract:Basedonenrichmentcharacteristicsandformationtheoryabout1OWrankcoa1bedmethane(LCBM)athomeandabroad,nati
5、onalLCBMgenetictypesandformationmodelshavebeenstudied.TheresultsshowthatgenetictypesofLCBMincludethermogenicmethane,biogenicmethaneandmixedmethane.Thecharacteristicsoflowrankcoalreservoirincludeshallowbury,lowcontents,largethickness,highpermeabilityandt
6、ransformedeasily.coexistingwithotheroilgas.Basedonthepreviousresearchresultsofformationmodelsdividingthroughlithology,structureconditions,locationsandhydrogeololgyconditions,synthesizedynamicformationmodelhasbeenproposedinthispaper,includingmaterialbase
7、offavorablesedimentalenvironment,migrationpressuredifferenceofconstructs,methanesupplyandpreserveofhydrogeololgyconditions,discussingnewthoughtofselectingareaofLCBM.TakingYilancoal—bearingbasinforanexample,combinedpreviousresearchresultsandgeologicalcon
8、ditions,reservoirformingandaccumulationmodelofICBMinChinaisproposed,whichisadvantagecoalfacesrichwaterareaaccumulationmodelinslopewithcouplingbetweenprimaryandsecondaryorigin.Keywords:lowrank;coal—bedmethane;genetictypes;formatio