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1、膠萊盆地萊陽(yáng)期原型盆地格局李凌(構(gòu)造地質(zhì)學(xué))指導(dǎo)教師:昊智平教授摘要膠萊盆地為一受中生代中、晚期斷裂活動(dòng)控制和改造的中生代陸相殘留盆地,萊陽(yáng)組是其油氣勘探的主要目的層系,因此,恢復(fù)萊陽(yáng)組沉積期原型盆地的形態(tài)格局是膠萊盆地油氣勘探要解決的一個(gè)關(guān)鍵問(wèn)題,并且對(duì)于準(zhǔn)確評(píng)價(jià)區(qū)域油氣資源潛力具有重要的現(xiàn)實(shí)意義。本論文在前人研究的基礎(chǔ)上,依據(jù)現(xiàn)代地層學(xué)中多重地層劃分的原則,結(jié)合野外研究結(jié)果,將膠萊盆地萊陽(yáng)組地表出露的地層細(xì)分為逍仙莊段、林寺山段、止鳳莊段、馬耳山段、水南段、龍旺莊段、楊家莊段、曲格莊段、法家塋段、杜村段等巖石地層單位,并分析了各巖
2、石地層單位的時(shí)空展布格局。在此基礎(chǔ)上,通過(guò)對(duì)盆地沉積相、古水流方向以及大野頭凸起、李黨家一馬山凸起和柴溝地壘等正向構(gòu)造單元形成時(shí)期的分析,對(duì)萊陽(yáng)組沉積期的原型盆地格局進(jìn)行了恢復(fù)。研究結(jié)果表明:在萊陽(yáng)組沉積期,膠萊盆地內(nèi)部可劃分為萊陽(yáng)凹陷、平度一夏格莊凹陷、高密一諸城凹陷、海陽(yáng)凹陷等四個(gè)相對(duì)獨(dú)立的沉積單元。原型盆地的沉積格局和油藏的保存條件決定了本區(qū)油氣勘探方向的選擇,石油地質(zhì)條件分析表明:萊陽(yáng)凹陷中西部和平度一夏格莊凹陷是源巖較為發(fā)育的地區(qū),其有機(jī)質(zhì)豐度整體可達(dá)好、較好烴源巖標(biāo)準(zhǔn),有機(jī)質(zhì)類型以I型、Ⅱ.型為主,且已經(jīng)達(dá)到熱演化成熟階段
3、,加之具有較好的油氣保存條件,因此,萊陽(yáng)凹陷中西部、平度一夏格莊凹陷及其周圍的構(gòu)造高部位是膠萊盆地油氣勘探的最有利區(qū)域。關(guān)鍵詞:原型盆地,萊陽(yáng)組,膠萊盆地ThePatternofPrototypeBasinDuringthePeriodofLaiYangFormationinJiaoLaiBasinLiLing(StructuralGeology)DirectedbyProfessorWuZhi-pingAbstractJiaoLaiBasinisacontinentalrelictbasinwhichhadbeencontrolle
4、dandreconstructedbyfaultsdevelopedinthemiddleandlatterperiodofMesozoicandLaiYangformationofJiaoLaiBasinisthetargetstratumoft11eoilandgasexploration.Onthebasesofothers’researches.a(chǎn)ccordingtomultiplestratigraphicdivisionprincipleofmodemstratigraphyandfieldresearches,thepa
5、pernotonlysubdividedLaiYangformationintoXiaoXianzhuangmember,LinSishanmember,ZhiFengzhuangmember,MaErshanmember,ShuiNanmember,LongWangzhuangmember,YangJiazhuangmember,QuOezhuangmember,FaJiayingmemberandDuCurlmember,butalsoanalyzedtheirspacebuilt-uppattern.Onthesebases,b
6、ymeansoftheanalysesofsedimentaryfacies,paleocurrentorientations,combinedwiththeresearchesofpositivetectonicunits,suchasDaYetouuplift,LiDangiia--MaShahupliftandChaiGouhorst,thispaperrebuiltthepatternofprototypebasinduringthedepositingperiodofLaiYangformation.researchresu
7、ltindicatedthattherewerefourrelativeindependentsedimentaryunitsduringthedepositingperiodofLaiYangformation,suchasLaiYangsag,PingDu-XiaGezhuangsag,GaoMi-ZhuChangsagandHaiYangsag.Theselectionofadvangtagcoushydrocarbonreserviorexplorationln'easmainlyreliesonthesedimentaryp
8、atternofprototypebasinandconservationconditions.Petroleumgeologicconditionanalysesresultsareasfollows:Hydrocar