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1、石油勘探與開(kāi)發(fā)5382011年10月PETR0LEUMEXPL0Rr10NANDDEVELOPMENT、,o1.38NO.5文章編號(hào):1000-0747(2011)05.0538—14川西坳陷復(fù)合一聯(lián)合構(gòu)造及其對(duì)油氣的控制李智武,劉樹(shù)根,陳洪德,孫東,林杰,湯聰(成都理工大學(xué)“油氣藏地質(zhì)及開(kāi)發(fā)工程”國(guó)家重點(diǎn)實(shí)驗(yàn)室)基金項(xiàng)目:國(guó)家自然科學(xué)基金項(xiàng)目(40739901;40802049);四川省教育廳自然科學(xué)青年基金項(xiàng)目(08ZB062)摘要:據(jù)不整合和巖相記錄及古構(gòu)造分析,川西坳陷中新生代陸相地層中至
2、少存在11個(gè)構(gòu)造運(yùn)動(dòng)界面。受西緣龍門(mén)山?jīng)_斷帶、北緣米倉(cāng)山構(gòu)造帶和西南緣川滇構(gòu)造帶影響,JJ『西坳陷發(fā)育北東向、近東西向和近南北向3組主要構(gòu)造,其中北東向構(gòu)造在多數(shù)構(gòu)造活動(dòng)中都有不同程度發(fā)育,而近東西向和近南北向構(gòu)造則分別形成于燕山期和喜馬拉雅期。同時(shí),3組構(gòu)造在多期次構(gòu)造活動(dòng)中相互疊加,形成了同軸復(fù)合、橫跨復(fù)合、斜接復(fù)合、多向復(fù)合和聯(lián)合等5種主要形式的疊加構(gòu)造川西坳陷構(gòu)造對(duì)油氣的控制表現(xiàn)在構(gòu)造適時(shí)性、構(gòu)造控位和構(gòu)造改造3個(gè)方面,原生氣藏形成及油氣分布主要受控于早期構(gòu)造(印支一燕山期),而晚期構(gòu)造(
3、主要是喜馬拉雅期)僅對(duì)早期氣藏起改造作用,表現(xiàn)為早期構(gòu)造變位、儲(chǔ)集層改善、原生氣藏破壞或次生氣藏形成。印支一燕山期古構(gòu)造的精確恢復(fù)以及多期、多組構(gòu)造疊加過(guò)程中裂縫活動(dòng)特征是該區(qū)今后油氣勘探應(yīng)重點(diǎn)關(guān)注的兩個(gè)方面。圖10表1參58關(guān)鍵詞:川西坳陷;構(gòu)造期次;構(gòu)造疊加;油氣聚集中圖分類號(hào):TEl22.1文獻(xiàn)標(biāo)識(shí)碼:AStructuralsuperimpositionandCOnjunctionanditseffectsonhydrocarbonaccumulationintheWesternSichua
4、nDepressionLiZhiwu,LiuShugen,ChenHongde,SunDong,LinJie,TangCong(StatekeyLaboratoryofOilandGasReservoirGeologyandExploration,ChengduUniversityofTechnology,Chengdu610059,China)Abstract:Recordsofunconformitiesandlithologicfaciesandanalysisofpaleo-structu
5、reshowthatatleasteleventectonicboundariesexistintheMeso-CenozoiccontinentalstrataintheWesternSichuanDepression.AfectedbytheLongmenshanthrustbeltonthewestside,MicangshanstructuralbeltonthenorthsideandChuandianstructuralbeltonthesouthwestside,NE—trendin
6、g,sub-EW-trendingandsub—NS-trendingstructuresweredevelopedcorrespondinglyintheWesternSichuanDepression.TheNE—trendingstructuresweredevelopedinvaryingdegreesinmosttectonicmovements,whilethesub-EW-trendingandsub-NS—trendingstructureswereformedintheYansh
7、anianandHimalayan,respectively.Thethreegroupsofstructuresweresuperimposedbyoneanotherinmulti—stagetectonicmovements,producingmainlyfivetypesofstructuralcomplexes,i.e.coaxialsuperimposition,orthogonalsuperimposition,obliquesuperimposition,multi—directi
8、onsuperimposition,andstructuralconjunction.StructuralcontrolsonhydrocarbonaccumulationintheWesternSichuanDepressionCanbeexpressedasthefollowingthreeaspects,i.e.timing,locationandmodification.Hydrocarbondistributionandtheformationofprimarygaspo