鄂爾多斯盆地西緣構(gòu)造演化與油氣聚集研究.pdf

1、蘭州大學(xué)碩士學(xué)位論文鄂爾多斯盆地西緣構(gòu)造演化與油氣聚集研究姓名：邊少之申請學(xué)位級別：碩士專業(yè)：礦物學(xué)、巖石學(xué)、礦床學(xué)指導(dǎo)教師：王金榮20050501蘭型查堂堡!：堂些笙莖AbstractAsthetectonicboundarybetweenWestChinaandEastChina，thewestmarginoftheOrdosBasinislocatedintheconvergentcompositejointamongsevera

2、ltectonicunitswithdifferentfeatures：OrdosBlock，AlashanBlock，QinlingQilianfoldbeltDuringthelonggeologicalevolutionhistoryitunderwentdifferenttectonicenvironmentsandmultiphasetectonicmovementBecauseofthese，itsgeologicalcha

3、racteristicsarecomplicatedandtectonicpositionisveryimportantTheexposedstrataintheareaarerelativelycompletewhicharesharplycontrastwiththoseintheproperbasinThewidedistributionoftheNeoarchean—PaleoproterozoicKhondaliteserie

4、sintheareasuggeststhatthecratonizationhadbeenalmostfinishedatthattimeFromProterozoictoPermian，developmentofthewestmarginofthebasinismainlycontrolledbyHelantaphrogenesisandQinling—QilianOceanSOthatamarkeddifferentsediment

5、ationbetweentheinteriorbasinandthewestmarginexistsWiththefinalclosureoftheQinlingOceanandcollisionorogenytheOrdosBasinbegantheevolutionoftheintercontinentalbasinBecausethewestbasinmarginwascontrolledbyvariedtectonicsyste

6、m，thesedimentationandtectonicsinthesouthweredifferentsignificantlyformthoseinthenorthInLateTriassic，thecompressionandupliftingoftheQinlingorogenicbeltproducedthesouthmarginforelandbasin；whileinthewestmargin，Northwardmove

7、mentoftheOrdosBlockresistedbytheAlashanBlockledtoforrnintercontinentalforelandbasinSincelateJurassic，influencedbythecollisionbetweentheEurasiaandIndiaplate，theNorthwestnorthwardsubductionofthePacificplateandtheinteractio

8、nbetweenthem，thewestmarginoftheOrdosBasinexperiencednortheast—southwestcompressionandtheYinchuanGrabenandtheHelanMountainbegantodevelopandcoupleInCenozoic，theslowupliftingoftheOrdosBasinterminatedthebasin’Sevolutionandth

9、eambientgrabenWasextensivelyformed，forexample，YinchuanGraben、vithagreatthickCenozoicstrataBasedonthenatureofthecrust，geothermalevents，geochemicalcharacteristicsoftheCretaceousbasalt，sedimentationandtectonics，anewideainvo