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1、學(xué)兔兔www.xuetutu.com天然氣比第35卷第6期OIL&GASGE0L0GY2014年12月文章編號(hào):0253—9985(2014)06—0820—07doi:10.11743/ogg20140609塔河油田天然氣特征對(duì)比與成因分析顧憶,黃繼文(中國(guó)石化石油勘探開發(fā)研究院無錫石油地質(zhì)研究所,江蘇無錫214151)摘要:塔河油田東西部奧陶系天然氣地球化學(xué)特征存在明顯的差異。依靠多年勘探開發(fā)及研究積累的大量天然氣分析測(cè)試數(shù)據(jù),結(jié)合塔河油田油氣成藏地質(zhì)條件與主要油氣成藏期次,從天然氣組分特征及碳、氫同位素特征等方面進(jìn)行研究,認(rèn)為塔河油田西部地區(qū)奧
2、陶系儲(chǔ)層天然氣以溶解氣或伴生氣為主,以甲烷碳同位素較輕為特征,其成因主要為原油初期裂解。塔河中部主體區(qū)奧陶系儲(chǔ)層天然氣主要以伴生氣為主,部分是凝析氣,為與原油同期次充注的成熟一高成熟天然氣。塔河?xùn)|部地區(qū)奧陶系儲(chǔ)層天然氣具有高干燥系數(shù)和甲烷碳、氫同位素較重的特征,成熟度高于塔河中、西部地區(qū),部分天然氣出現(xiàn)甲烷、乙烷碳同位素倒轉(zhuǎn),表明天然氣具兩期充注成藏特征。第一期天然氣充注成藏時(shí)間與塔河中部主體區(qū)油氣成藏時(shí)間一致;第二期充注以過成熟裂解氣為主,為原油裂解氣與干酪根裂解氣的混合氣,充注成藏期為喜馬拉雅期晚期。不同成因的天然氣及不同期次天然氣的混合疊加,是
3、形成塔河油田不同地區(qū)天然氣特征差異的主要因素。關(guān)鍵詞:地球化學(xué)特征;成因類型;天然氣;奧陶系;塔河油田中圖分類號(hào):TEl22.1文獻(xiàn)標(biāo)識(shí)碼:ACharacteristicscomparisonandoriginofnaturalgasinTaheoilfieldGuYi,HuangJiwen(WuxiResearchInstituteofPetroleumGeology,PetroleumExploration&ProductionResearchInstitute,SINOPEC,Wuxi,Jiangsu214151,China)Abstract:
4、ThegeochemicalfeaturesofnaturalgasintheOrdovicianvaryobviouslyfromeasttowestinTaheoilfield.Afteryearsofexploration,alargeamountoftestingdatafornaturalgasaccumulated.IncombinationwithanalysesofthegeologicconditionsandstagesfornaturalgasaccumulationsinTaheoilfield,studiesofnatura
5、lgascompositionsandC/Hisotopicfeatures,ledtothefollowingconclusions.InthewesternpartofTaheoilfield,thenaturalgasintheOrdovicianreservoirswasmainlydissolvedorassociatedgas,featuringinlightermethanecarbonisotopes,andmainlyoriginatedfromtheinitialcrackingofcrudeoils.Inthecentralpa
6、rtofTaheoilfield,thenaturalgasintheOrdovicianreservoirswasmain—lyassociatedgasandpartiallycondensategas,andwasmature/high—maturegaswhichwaschargedatthesametimeascrudeoils.IntheeasternpartofTaheoilfield,thenaturalgasintheOrdovicianreservoirsfeatureinhighlydrycoeficientandheavyme
7、thaneC/Hisotopes,withhighermaturitythanthosesamplesfromboththewesternandthecentralTaheoil-field.Forsomenaturalgassamples,8”C1>8”C2indicatingthatthenaturalgaswerechargedandaccumulatedinsta—,ges.Thefirststageofnaturalgaschargingandaccumulationtookplacewhenhydrocarbonaccumulatedin
8、thecentralpartofTaheoilfield.Inthesecondstageofnatural