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1、學(xué)兔兔www.xuetutu.com--5天然乞此第33卷第5期OIL&GASGEOLOGY2012年10月文章編號:0253—9985(2012)05—0705—08巴西坎普斯盆地油氣地質(zhì)特征與隱蔽油氣藏張申,郭莉,林衛(wèi)東(中國中化石油勘探開發(fā)有限公司,北京100031)摘要:近年來,巴西海上已成為中外油公司投資和關(guān)注的熱點地區(qū)。為降低地質(zhì)風(fēng)險,根據(jù)物探和鉆井資料,系統(tǒng)分析了巴西坎普斯盆地的烴源巖、儲集層、蓋層及圈閉等基本石油地質(zhì)條件,剖析了盆地已發(fā)現(xiàn)的4類典型隱蔽油氣藏。在此基礎(chǔ)上,提出了隱蔽油氣藏在盆地油氣勘探中的巨大潛力。研究表明,坎普斯
2、盆地自早白堊世形成以來,經(jīng)歷了裂谷期、漂移早期和漂移后期3個發(fā)展階段,沉積了非海相、過渡相和海相三大巨層序??财账古璧貜南掳讏捉y(tǒng)到新近系具備3套可能的烴源巖,但最重要的烴源巖是早白堊世的LagoaFeia組烴源巖,目前盆地中發(fā)現(xiàn)的所有油氣都是來自該套烴源巖??财账古璧貜南掳讏捉y(tǒng)到中新統(tǒng)都發(fā)現(xiàn)了油氣藏,有多種類型的儲層,包括裂縫玄武巖儲層、LagoaFeia組生物碎屑灰?guī)r儲層、Maca6組灰?guī)r、砂巖儲層和上白堊統(tǒng)一漸新統(tǒng)海相濁積砂巖儲層。隱蔽油氣藏在盆地中占據(jù)重要地位,主要類型是地層油氣藏,包括地層超覆油氣藏、潛山油氣藏和不整合遮擋油氣藏。要繼續(xù)加
3、強對隱蔽油氣藏的勘探,特別要重視巖性油氣藏和裂縫油氣藏的勘探。關(guān)鍵詞:隱蔽油氣藏;勘探潛力;油氣地質(zhì);坎普斯盆地;巴西中圖分類號:TEl21文獻標(biāo)識碼:APetroleumgeologyandsubtletrapsinCamposBasin,BraziloffshoreZhangShen,GuoLiandLinWeidong(SinochemPetroleumExplorationandProductionLtd.,Beijing100031,China)Abstract:Inrecentyears,Braziloffshorehasbecome
4、oneofthehotareasatractinginternationalinvestments.Inordertolowerexplorationrisk,westudiedthebasicelementsoftotalpetroleumsysteminCamposBasin,inclu-dingsoHreerocks,reservoirrocks,trapsandsealsbyintegratinggeophysicalprospectingandwelldata,analyzedfourkindsoftypicalsubtletrapsd
5、iscoveredinthisbasin,andproposedthatsubtletrapshavelargeexplorationpotentialsinthisbasin.SincetheformationofthebasinintheEarlyCretaceous,ithasexperiencedthreeevolu-tionstages,includingtifing,earlydriftingandlatedriftingstages,anddevelopedthreemegasequencesofnon-marine,transit
6、ionalandmarinefaciesrespectively.ThreesetsofsourcerockspossiblyoccurinthestratafromtheLowerCretaceoustotheNeogeneinCamposBasinandthemostimportantsourcerocksistheLowerCreta-ceousLagoaFeiaFormation,fromwhichallthediscoveredoil/gasinthebasinweresourced.Variousoil/gasreservoirsha
7、vebeendiscoveredinalltheformationsfromtheLowerCretaceoustotheMiocene,includingfrac-turedbasaltinthebasement,bioclasticsintheLagoaFeiaFormation,carbonatesintheMaca6Formation,clasticreservoirsandmarineturbiditesintheUpperCretaceous-Oligocene.Subtletrapsareveryimportantintheba-s
8、inandaredominatedbystratigraphictrapsincludingoverlaptraps,buried—hi