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1、第37卷第4期石油察囂沾屆Vo1.37,No.42015年7月PETROLEUMGEoLOGY&EXPER耵ENTJu1.,2015文章編號(hào):1001-6112(2015)00-0500-06doi:10.11781/sysydz201504500建南氣田志留系天然氣地球化學(xué)特征及氣源探討-李愛(ài)榮,李凈紅。,張金功。,宋立軍(1.西安石油大學(xué)地球科學(xué)與士程學(xué)院,西安710065;2.西北大學(xué)大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室/地質(zhì)學(xué)系,西安710069;3.武漢工程科技學(xué)院地質(zhì)科學(xué)與工程學(xué)部,武漢430200)摘要:根據(jù)建南氣田及鄰區(qū)的天然氣組分、烷烴碳同位素等資料
2、,結(jié)合區(qū)域烴源巖研究資料,研究了該區(qū)志留系天然氣的地球化學(xué)特征及其氣源特征。結(jié)果表明,建南氣田志留系天然氣為干氣,非烴氣體總含量低且無(wú)H,S氣體;烷烴氣碳同位素均小于一40%o,屬于油型氣成因,其母源為腐泥型于酪根。ln(c/C2)-In(C/C)相關(guān)性表明現(xiàn)今的志留系氣藏以原油二次裂解貢獻(xiàn)為主。結(jié)合該氣藏地質(zhì)特征綜合分析認(rèn)為,建南氣田志留系天然氣來(lái)源于志留系龍馬溪組碳質(zhì)頁(yè)巖,烷烴氣碳同位素局部倒轉(zhuǎn)為同源不同期的天然氣混合所致,即晚期原油裂解氣與早期干酪根降解氣混合。中上揚(yáng)子區(qū)廣泛分布且已成熟的志留系龍馬溪組頁(yè)巖預(yù)示志留系和石炭系的天然氣勘探前景良好。關(guān)鍵
3、詞:天然氣;地球化學(xué)特征;氣源;志留系;建南氣田;川I東地區(qū)中圈分類號(hào):TEl22.1文獻(xiàn)標(biāo)志碼:AGeochemicalcharacteristicsandoriginofnaturalgasfromtheSilurianinJiannangasfieldLiAirong,LiJinghong,ZhangJingong,SongLijun(1.SchoolofEarthScienceandEngtneering,Xi’anShiyouUnive~iq,’alz,Shaanxi710065,China;2.StateKeyLaboratoryofConti
4、nentalDynamics~DepartmentofGeology,NorthwestUniversity,Xi’an,Shaanxi710069,China;3.GeologyScienceandEngineeringDepartment,WuhanUnive~i@ofEngineeringScience,Wuhan,be430200,M)Abstract:ThegeochemicalcharacteristicsandoriginofthegasarestudiedaccordingtogascompositionandCar-bonisotoped
5、atafromtheJiannanandadjacentareasandcombinedwithregionalhydrocarbonsourcerockdata.ResultsshowthattheSiluriannaturalgasintheJiannangasfieldisdry.Thecontentofnon—hydrocarbongasislow,andnoH2Sexists.Thecarbonisotopesofn-alkanesarelowerthan一40‰,indicatingapetroliferousgasoriginfromsapr
6、opelkerogens.ThecorrelationbetweenIn(Cl/C2)andIn(C2/C3)showsthatthepresentdaySiluriangasmainlycomesfromthesecondarycrackingofcrudeoil.TheanalysesofgeologicfeaturesindicatethattheSiluriangasintheJiannangasfieldsourcefromthecarbonateshaleintheLongmaxiFormation.Thelocalreversalofalka
7、necarbonisotopescanbeexplainedbythemixingoflatestagecrudeoilcrackinggasandearlystagekerogendegradationgas.TheLongmaxishaleismatureandwidespreadinthemiddleandupperYangtzeregion,indicatingitisagoodprospectfornaturalgasexplorationinSilurianandCarboniferous.Keywords:naturalgas;geochem
8、icalcharacteristics;gassource;Sil