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1、第35卷第2~3期地質通報Vo1.35.Nos.2~32016年3月GEoLoGICALBULLETINOFCHINAMar..2016柴達木盆地西部古近系干柴溝組頁巖儲層特征張敏,張枝煥,歐光習2,尚長健,黎瓊ZHANGMin,ZHANGZhihuan,OUGuangxi,SHANGChangjian,LIQiong21.中國石油大學油氣資源與探測國家重點實驗室,北京102249;2.核工業(yè)北京地質研究院,北京1000291.StateKeyLaboratoryofPetroleumResourcesandProspecting,ChinaU
2、niversityofPetroleum,Belting102249,China;2.BeifingResearchInstituteofUraniumGeology,Beijing100029,China摘要:巖心觀察和巖石薄片鑒定顯示,柴達木盆地西部古近系干柴溝組存在層狀一非層狀泥頁巖、層狀一非層狀灰質泥頁巖、泥灰?guī)r、層狀一非層狀粉砂質泥巖和泥質粉砂巖5種巖相??傆袡C質含量(TOC)為O.2%~1.4%,有機質以Ⅱ型干酪根為主,普遍處于成熟階段。泥頁巖礦物成分以碎屑石英和粘土礦物為主,并含有不等量的方解石、白云石、長石、黃鐵礦等;發(fā)育原生孔
3、隙、有機質生烴形成的孔隙、次生溶蝕孔隙、粘土礦物伊利石化體積縮小形成的微孔隙及微裂縫5種頁巖氣儲集空間類型。研究表明,儲集空間發(fā)育主要受巖相類型、礦物成分、成巖作用、有機碳含量和有機質成熟度的影響。雖然研究區(qū)泥頁巖中有機質含量普遍較低,但有機質普遍處于成熟階段,儲層中發(fā)育多種儲集空間類型,并富含脆性礦物和富伊利石的粘土礦物。因此,柴達木盆地西部干柴溝組泥頁巖為良好的頁巖氣儲集層,具有一定的頁巖氣勘探前景。關鍵詞:干柴溝組;頁巖氣;儲層特征;柴達木盆地中圖分類號:P534.611文獻標志碼:A文章編號:1671—2552(2016)02/03—0
4、329—10ZhangM,ZhangZH,OuGX,ShangCJ,LiQ.CharacteristicsofshalegasreservoirrocksinPaleogeneGanchaigouFor-mation,westernQaidamBasin.GeologicalBulletinofChina,2016,35(2/3):329—338Abstract:TheobservationofthecoresandthinsectionsofrocksshowsthatthePaleogeneGanchaigouFormationintheQ
5、aidamBa—siniscomposedoffivehthofacies,i.e.,laminatedandnon—laminatedmudstone/shale,laminatedandnon—laminatedhmemudstone/shale,siltlimestone,laminatedandnon—laminatedsiltymudstone/shale,andargilaceoussiltstone.TheGanchaigouFormationcon—rains0.2%~1.4%organiccarbonfTOC).Theorga
6、nicmatterismatureanddominatedbytypeII—kerogen.Themineralcompositionisdominantlyclasticqua~zandclayminerals,togetherwithsuchminorcomponentsascalcite,dolomite,feldsparandpyrite.FiveWpesofreservoirspace,namelyprimarypore,poreofhydrocarbongeneration,secondarydissolutionpore,pore
7、byillitizationandn1i—cro—fracture.Thedevelopmentofreservoirspaceisstronglycontroledbythelithofacies,mineralcomposition,diagenesis,organiccarboncontentandorganicmattermaturity.TheshaleofGanchaigouFormationischaracterizedbyloworganiccarboncontent.However,theorganicmatterisgene
8、rallymature.Severaltypesofreservoirspace,highcontentofbfittlemineralsandill