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1、第46卷第1期地球物理學(xué)報(bào)Vol.46,No.12003年1月CHINESEJOURNALOFGEOPHYSICSJan.,2003遼河盆地古近紀(jì)二期構(gòu)造演化特征的研究1221單家增孫紅軍肖乾華汪道京2222許坤劉曉峰申大媛孫素青1中國(guó)科學(xué)院地質(zhì)與地球物理研究所,北京1000292中國(guó)石油遼河油田分公司勘探開(kāi)發(fā)研究院,盤(pán)錦124010摘要遼河盆地新的地球物理證據(jù)和構(gòu)造物理模擬實(shí)驗(yàn)結(jié)果表明,遼河盆地古近紀(jì)的構(gòu)造史由二期組成,即大陸裂谷期和右行走滑構(gòu)造運(yùn)動(dòng)期.大陸裂谷的演化受古近紀(jì)古新世至始新世房身泡期至沙河街期(Ef~Es,大約63.0~37.0Ma)地幔上
2、涌派生拉張應(yīng)力的驅(qū)動(dòng):右行走滑構(gòu)造運(yùn)動(dòng)發(fā)生在古近紀(jì)漸新世東營(yíng)期(Ed,大約36.9~24.5Ma).二期構(gòu)造運(yùn)動(dòng)導(dǎo)致了遼河盆地復(fù)雜斷裂體系的形成和演化.裂谷后的右行走滑構(gòu)造運(yùn)動(dòng)使得早期斷層再活動(dòng)和生成新的斷層.基于物理模擬實(shí)驗(yàn)結(jié)果和地球物理資料分析,古近紀(jì)東營(yíng)期右行走滑構(gòu)造運(yùn)動(dòng)引起的水平位移大約為4~8km.遼河盆地復(fù)雜的斷裂體系不僅受到早期拉張應(yīng)力的強(qiáng)烈控制,而且,還受到后期右行走滑構(gòu)造運(yùn)動(dòng)的影響.與此同時(shí),二期構(gòu)造運(yùn)動(dòng)導(dǎo)致了該區(qū)油氣的運(yùn)移和聚集.關(guān)鍵詞遼河盆地古近紀(jì)二期構(gòu)造演化新的地球物理證據(jù)物理模擬實(shí)驗(yàn)結(jié)果文章編號(hào)0001-5733(2003)01-
3、73-06中圖分類號(hào)P313收稿日期2002-02-01,2002-08-13收修定稿.STUDYONCHARACTERSOFTWOPHASESSTRUCTURALEVOLUTIONATTHELIAOHEBASIN,CHINADURINGPALEOGENETIMES12212SHANJIAZENGSUNHONGJUNXIAOQIANHUAWANGDAOJINGXUKUN222LIUXIAOFENGSHENDAYUANSUNSUQING1InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beij
4、ing100029,China2ExplorationandDevelopmentResearchInstituteofLiaoheOilField.Panjin124010.ChinaAbstractNewgeophysicalevidenceandtheresultsofthemodelingexperimentindicatethatthestructuralhistoryoftheLiaohebasin,ChinaduringthePaleogenetimesconsistsoftwophases,acontinentalriftphaseanda
5、dextralstrike)slipphase.ThecontinentalriftisdrivenbyextensionalstressesfromupwellingofthemantleduringtheFangshenpaoandShahejiephasesofPaleoceneandEocene,Paleogenetimes(Ef-Esl,about63.0~37.0Ma).Thedextralstrike-slipmovementoccurredduringtheDongyingphaseofOligocene,Paleogenetimes(Ed
6、,about36.9~24.5Ma).TwophasesofthestructuralmovementleadtoformingandevolutionofcomplexfaultsystemintheLiaohebasin.Itissuggestedthatdextralstrike-slipmovementofpost-riftreactivatedolderextensionalfaultsandproducednewfaults.Onthebasisofresultsfrommodelingexperimentsandanalysisofgeoph
7、ysicalinformation,thedisplacementmagnitudescausedbydextralstrikemovementduringtheDongyingphaseofPaleogenetimes(Ed)isabout4~8km.NewstudiesprovethatcomplexfaultsystemsoftheLiaohebasinarenotonlystronglycontrolledbyolderextensionalstresses,butalsoinfluencedbyyoungerdextralstrike)slipm
8、ovement.Twophasestructuralmovemen
