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1、第36卷第5期石油察劈弛屆Vol_36.No.52014年9月PETRoLEUMGE0LOGY&EXPERIMENTSep.,2014文章編號:1001-6112(2014)05—0583—06doi:10.11781/sysydz2Ol4O5583西非里奧穆尼盆地油氣成藏條件及勘探方向倪春華,周小進,包建平,段鐵軍,程建,裴威。(1.長江大學(xué)地球環(huán)境與水資源學(xué)院,武漢430100;2.中國石化石油勘探開發(fā)研究院無錫石油地質(zhì)研究所,江蘇無錫214126;3.無錫中關(guān)村軟件園發(fā)展有限公司,江蘇無錫214135)摘要:西非里奧穆尼
2、盆地經(jīng)歷了陸內(nèi)裂谷、陸間裂谷和被動大陸邊緣3個構(gòu)造演化階段,發(fā)育多套烴源巖、儲層及泥頁巖(鹽巖)蓋層。以陸間裂谷階段發(fā)育的阿普特鹽巖層為界,主要形成鹽上、鹽下2大含油氣系統(tǒng)。鹽構(gòu)造、有利儲層控制了鹽上含油氣系統(tǒng)的有效成藏,優(yōu)質(zhì)烴源、蓋層則為鹽下含油氣系統(tǒng)的關(guān)鍵成藏要素。綜合分析認為,里奧穆尼盆地的油氣勘探重點為鹽上的白堊系,應(yīng)尋找與鹽構(gòu)造相關(guān)、濁積砂體發(fā)育的構(gòu)造一地層復(fù)合型油氣藏;對鹽下領(lǐng)域,應(yīng)重點探索裂谷洼陷生烴中心、阿普特鹽巖封蓋條件好的地區(qū),并以近源的有利構(gòu)造作為優(yōu)先勘探目標。關(guān)鍵詞:盆地演化;含油氣系統(tǒng);成藏條件;勘探
3、方向;里奧穆尼盆地;西非中圖分類號:TEl22.1文獻標識碼:APetroleumaccumulationconditionsandexplorationdirection0fRioMuniBasin.WestAfricaNiChunhua’,ZhouXiaojin,BaoJianping,DuanTiejun,ChengJian,PeiWei(1.SchoolofEarthEnvironmentandWaterResources,YangtzeUniversity,Wuhan,Hubei430100,China;2.Wuxi
4、ResearchInstituteofPetroleumGeology,SINOPEC,Wuxi,Jiangsu214126,China;3.WuxZhongguancunSoftwareParkDevelopmentCo.,Ltd.,Wuxi,Jiangsu214135,Cina)Abstract:Basedonthebackgroundofregionalstructuralevolution.thetectono—sedimentaryevolutionofRioMuniBasin,WestAfricacanbedivi
5、dedintothreephases:intracontinentalrift,intercontinenta1riftandpassivecontinentalmargin.Ithasbeenprovedbyexplorationandresearchthattherearemultilayersourcerocks,reser-voirsandcapsinthebasin.WiththeAptianSaltdevelopedintheintracontinentalriftphaseastheinterface,there
6、arepre—saltandpost—saltpetroleumsystems.Itisshowedthatsaltstructuresandfavorablereservoirscontroltheeffectivehydrocarbonaccumulationofthepost—saltsystem,whilehigh—qualitysourcerocksandcapsarethekeyreservoirformingfactorsofthepre-saltsystem.Itisrecognizedbycomprehens
7、iveanalysisthatthepetroleumexplorationfocusshouldbetheCretaceousonthesaltandthecomplexhydrocarbonreservoirswithstructurestra-tigraphywiththedevelopmentofsahstructureandturbiditesandbody.Itissuggestedthatthenear—sourcefavor-ablestructuresarepriorityexplorationtargets
8、tothepre·-saltstratainthearealocatedinthehydrocarbongenera·-tioncenterofriftsag.Keywords:basinevolution;petroleumsystem;reservoir-formingc