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1、學(xué)兔兔www.xuetutu.com天乞ta/3.第29卷第5期OIL&GASGE0L0GY2008年10月文章編號(hào):0253—9985(2008)05—0557—08中國海相層系油氣基本特點(diǎn)與潛力祭44-互國,金之鈞,陳孔全,李鐵軍(中國石油化工股份有限公司石油勘探開發(fā)研究院,北京100083)摘要:中國境內(nèi)古生代和中生代的大陸邊緣沉積、地臺(tái)蓋層大多已褶皺成山,因而海相疊合殘留盆地的油氣地質(zhì)條件的特殊性就成為中國石油天然氣地質(zhì)的一大特色。在地質(zhì)歷史發(fā)展過程中,具有最佳的源巖、儲(chǔ)層、蓋層發(fā)育條件,同世界主要油氣富集帶的其他盆地一樣,具有良好的早期資源物質(zhì)基礎(chǔ)與成藏條件。中國
2、海相碳酸鹽巖層系形成時(shí)間早、地層時(shí)代老,勘探目的層埋藏深,尤其是經(jīng)過多期的構(gòu)造運(yùn)動(dòng)的疊加改造,油氣成藏規(guī)律復(fù)雜,造就了中國海相碳酸鹽巖層系油氣勘探的特殊性。近期勘探成果表明,中國海相層系具備發(fā)育大中型油氣田的物質(zhì)基礎(chǔ),在適宜的條件下仍可形成大規(guī)模的油氣聚集。構(gòu)造差異性演化使海相盆地含油氣性及油氣產(chǎn)出規(guī)模等方面,存在明顯差異。四川盆地、鄂爾多斯盆地海相以氣為主,塔里木盆地油氣兼有。主要大中型油氣田的勘探主要應(yīng)聚焦在海相層系發(fā)育的塔里木盆地、四川盆地及周緣、鄂爾多斯盆地。關(guān)鍵詞:構(gòu)造差異性演化;四川盆地;鄂爾多斯盆地;塔里木盆地;疊合盆地;中國海相層系中圖分類號(hào):TEl22.3
3、文獻(xiàn)標(biāo)識(shí)碼:AEssentialFeatureandpotentialofhydrocarbonaccumulationinChinamarinesequencesCaiLiguo,JinZhijun,ChenKongquan,LiTiejun(PetroleumExploration&ProductionResearchInstitute,SINOPEC,Belting100083,China)Abstract:PaleozoicandMesozoicsedimentsofcontinentalmarginsandplatformcoversaremostlyfolded
4、intomountainsinChina,andtheuniquemarinesuperimposed—residualbasinsbecomeasignificantfeatureofChinapetroleumgeology.Duringthegeologicalevolution,theancestorsofthesebasinsoncehadexcellentsource,reser—voirandsealrocks,withtheirconditionsofhydrocarbonresourcesandaccumulationasgoodasthoseofothe
5、rba'sinsinworldpetroleumprovinces.However,themarinecarbonatesequencesinChinaareolderinagedeeperin,explorationtargets,andcomplexinhydrocarbonaccumulationduetomultipleeventsoftectonicsuperimpositionandreworking,resultinginthepeculiarityofpetroleumexplorationinthesemarinecarbonatesequences.Re
6、centexplorationresultshaveshownthatlargehydrocarbonaccumulationsarestil1likelytobeformedundersuitableconditionsinthesemarinesequencesbecauseoftheirfoundationsoforganicmatter.Differentialtectonicevo1u—tionhasmakethemarinebasinsbesignificantlydifferentinhydrocarbonpotentialandproductioncapac
7、ity.Thus,SichuanandOrdosbasinsarepredominatedbygasproduction,andTarimbasinisabletoproducebothoilandgas.Therefore,lookingforgiantandlargefieldsshouldbefocusedonTarimSichuananditsperipheryand,Ordosbasinswithdevelopedmarinesequences.Keywords:differentialtectonice