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1、中國(guó)石油大學(xué)(華東)碩士學(xué)位論文六盤山盆地白堊系沉積構(gòu)造演化及原型盆地研究姓名:張磊申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):構(gòu)造地質(zhì)學(xué)指導(dǎo)教師:鐘建華20090501摘要六盤山衙地位于秦祁造山帶、阿拉善地塊和華北板塊交接帶,是青減高原的東北邊界,具有重要的大地構(gòu)造位置和較低的油氣勘探程度,特別是對(duì)于白堊系原型甕地及后期演化問(wèn)題認(rèn)識(shí)不足。本文以沉積學(xué)、構(gòu)造地質(zhì)學(xué)為理論指導(dǎo),綜合運(yùn)用露頭、地震、地球物理和鉆井資料對(duì)白堊系殘留盆地的沉積、構(gòu)造特征進(jìn)行了深入研究,恢復(fù)了六盤山甕地白堊系貧地原型。研究成果對(duì)于六盤山錳地的油氣勘探和鄂爾多斯甕地西緣地質(zhì)資料具有一定的意義。在對(duì)野外露頭詳細(xì)踏勘基礎(chǔ)上,
2、結(jié)合地震、鉆井資料對(duì)六盤山甕地白堊系地層發(fā)育特征、殘留厚度、分布情況及沉積相等特征進(jìn)行了系統(tǒng)的研究,確定了六盤山甕地白堊系沉積充填格局。在地震解釋資料及重磁電特征分析基礎(chǔ)上,結(jié)合區(qū)域地質(zhì)調(diào)查資料,研究了六盤山盆地主要構(gòu)造單元?jiǎng)澐?、斷層發(fā)育情況及盆地發(fā)育分帶性特征:通過(guò)野外露頭及地震資料分析盆地發(fā)育的主要構(gòu)造樣式,通過(guò)對(duì)主要地震測(cè)線的剖面分析,確定了盆地白堊系以來(lái)的構(gòu)造演化特征。在對(duì)殘留盆地沉積、構(gòu)造特征詳細(xì)研究的基礎(chǔ)上,通過(guò)對(duì)野外斜歪背斜及斷層特征分析白堊系以來(lái)翁地應(yīng)力場(chǎng)特征發(fā)生了重要變化;對(duì)甕地周邊沉積記錄對(duì)比確定了原型貧地邊界;采用聲波時(shí)差法和地層趨勢(shì)對(duì)比法恢復(fù)白堊系
3、術(shù)期隆升剝蝕量。綜合上述研究成果,對(duì)六盤山衙地白堊系原型甕地面貌進(jìn)行了恢復(fù),指出了六盤山笳地油氣勘探方向。關(guān)鍵詞:六盤山盆地,白堊系,沉積特征,構(gòu)造演化,原型甕地TheDepositionalEvolutionandTertiaryTectonicandReconstructionoftheCretaceousProto-typeBasininLiupanshanBasinZhangLei(StructuralGeology)DirectedbyProf.ZhongJianhuaAbstractLiupanshanbasinislocatedinthetransferbe
4、ltofQinQibelt,AlashanblockandNorthChinaplate,thenorth-easternborderofQinghai·TibetPlateau,whichisanimportanttectoniclocationandwithlowerextentofoilandgasexploration,especiallyinadequateunderstandingoftheprototypebasinofCretaceousandtheevolution.Inthispaper,withthetheoreticalguidanceofthes
5、edimentary,structuralgeologyandthecomprehensiveuseofoutcrop,seismic,geophysicalanddrillingdata,studyonthesedimentaryandstructuralfeaturesoftheresidualbasinoftheCretaceous,resumetheprototypeoftheLiupanshanBasinofCretaceous.researchresulthascertainsignificancefortheoilandgasexplorationinLiu
6、panshanBasinandthegeologicaldataofwesternOrdosBasin.Basedonthedetailedspotsurveyoftheoutcrop,withthecombinationofseismicanddrillingdata,wecarryonasystematicstudyofthedevelopmentcharacteristics,residualthicknessanddistributionoftheCretaceousformationinLiupanshanbasin.TodeterminetheSediment
7、aryfillingpaUernofCretaceoussedimentaryinLiupanshanbasin.Basedontheanalysisofthegravity·magnetic—electricdata,combinedwithregionalgeologicalsurveys,carryonthestudyofthemaintectonicunits,situationofthedevelopmentoffaultandcharacteristicsofdevelopmentofbasin;Analysist