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1、第42卷第4期中國地質(zhì)、,o1.42.NO.42015年8月GE0L0GYINCHINAAug.,2015陳文彬,付修根,譚富文,等.藏北羌塘盆地上三疊統(tǒng)典型剖面烴源巖地球化學(xué)特征研究[J]_中國地質(zhì),2015,42(4):1151-1160.ChenWenbin,F(xiàn)uXiugen,TanFuwen,eta1.GeochemicalcharacteristicsofUpperTriassicsourcerocksfromtypicalsectionsinQiangtangBasinnorthernTibet[J].GeologyinChina,2015,42(4):
2、1151—1160(inChinesewithEnglishabs~act).藏北羌塘盆地上三疊統(tǒng)典型剖面烴源巖地球化學(xué)特征研究陳文彬付修根譚富文馮興雷曾勝強(中國地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心,四川成都610081)提要:依據(jù)露頭樣品和測試數(shù)據(jù),從有機質(zhì)豐度、有機質(zhì)類型及成熟度方面對羌塘盆地上三疊統(tǒng)烴源巖特征進行了評價。結(jié)果表明:沃若山和扎那隴巴剖面有機質(zhì)豐度較高,為中等一好烴源巖,有機質(zhì)類型以Ⅱ型為主,處在高成熟階段,以生成凝析油和濕氣為主;而藏夏河剖面和肖茶卡剖面有機質(zhì)豐度低,生烴能力較差,有機質(zhì)類型為Ⅱ:型,處在過成熟階段,主要生成干氣??傮w來看,羌塘盆地上三疊
3、統(tǒng)存在中等一好烴源巖,尤其是盆地凹陷區(qū),可能存在好的烴(氣1源巖,這對于羌塘盆地以后的油氣勘查具有重要意義。關(guān)鍵詞:羌塘盆地;上三疊統(tǒng);烴源巖;地球化學(xué)特征中圖分類號:TEl22.r13文獻標(biāo)志碼:A文章編號:1000—3657(2015)04-1151—10GeochemicalcharacteristicsofUpperTriassicsourcerocksfromtypicalsectionsinQiangtangBasin,northernTibetCHENWen—bin,F(xiàn)UXiu—gen,TANFu—wen,F(xiàn)ENGXin—lei,ZENGSheng—q
4、iang(ChengduInstituteofGeologyandMineralResources,Chengdu610081,Sichuan,China)Abstract:AccordingtotheoutcropsamplesandanalyticaldataofUpperTriassicsourcerocksfromQiangtangBasin,theauthorsevaluatedthehydrocarbongenerationcapacitybasedontheabundanceoforganicmatter,thetypeoforganicmattera
5、ndmaturityoforganicmater.TheresultrevealsthattheabundanceoforganicmaterishighinWoruoshansectionandZanalongbasection,andtherocksaremedium—goodsourcerocks,thetypeoftheorganicmaterisII2,thematurityishighanditmainlygeneratescondensateandmoisture.TheabundanceoforganicmaterislowinDuoseliangz
6、isectionandXiaochakasection,andithaspoorgenerationcapacity,thetypeoforganicmaterisI12,thematurityisover—maturityanditmainlygeneratesdrygas.Overall,theUpperTriassicsourcerocksinQiangtangBasinhavegoodhydrocarbongenerationcapacity,especiallyinthedepressionarea.Theresultsachievedbytheautho
7、rshaveimportantsignificanceforthefutureexplorationinQiangtangBasin.Keywords:QiangtangBasin;UpperTriassic;sourcerocks;geochemicalcharacteristics收稿日期:2014—07-17;改回日期:2014-1卜18基金項目:國家油氣專項“青藏高原重點盆地油氣資源戰(zhàn)略選區(qū)”項目()(Q一2009—1)、天然氣水合物試采專項“羌塘盆地天然氣水合物資源勘查(形成條件及控礦因素研究)”(GZHL20110309)及國家自然科學(xué)基金(4117