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1、博興洼陷沙四段沉積相及沉積環(huán)境研究摘要博興灃陷是東營凹陷的一個很有潛力的重要勘探地區(qū)。本文以現(xiàn)代沉積學理論指導(dǎo),綜合利用鉆測井、地球化學、地球物理等資料,結(jié)合區(qū)域地質(zhì)資料和前人研究成果,對博興洼陷沙四段沉積相、沉積環(huán)境進行了研究。本文主要根據(jù)碎屑巖的粒度分析,結(jié)合沉積序列和微相分析,在研究區(qū)識別出三角洲、扇三角洲和湖泊幾種沉積相,并詳細描述和歸納了各沉積相及其沉積亞相和微相的特征:如水下扇亞相濁積巖微相、三角洲前緣亞相河口壩微相和濱淺湖亞相灘壩微相等。沙四段沉積時期博興洼陷是一個封閉的斷陷湖盆,從沙四段沉積早期到沙四段沉積晚期,隨著湖盆斷陷,水體逐漸變深,氣
2、候從比較干燥變得比較濕潤,從氧化環(huán)境到還原環(huán)境。研究表明,三角洲前緣、扇三角洲前緣、濱淺湖灘壩、湖底扇等為儲集有利相帶,而且它們明顯受盆地斷裂構(gòu)造控制。關(guān)鍵詞:博興洼陷,沙四段,粒度分析,沉積相,沉積環(huán)境ThestudyofsedimentaryfaciesanddepositionaenvironmentofBoxingDepressionEs4AbstractBoxingDepressionisoneofimportantandpotanyitalexploringareasinDongyingSag,ShandongProvince,easternCh
3、ina.Undertheguidanceofmodernsedimentology,integratingwelllogging,geochemistry,andformerdata,thepaperstudysthasedimentaryfaciesanddepositionalenvironmentofthefouFthmemberoftheShahejieFormation(Es4),Palaeogena.Basedonthegrain—sizeananlysisofdetritalrocks.integratingsediementarysequen
4、ceandmicrofaciesanalysis,thepaperdistinguishesseveraItypesofsedimentaryfaciesofdelta,fanandIacustrine,andcharacterizesvarioussedimentaryfacies,sub-faciesandmicrofacies,suchasturbiditymicrofaicesofbenthalfansub-facies。estuarinebarfaciesofdeltafrontsub-faciesandshoal-barmicrofaciesof
5、fitcoral—shallowfakesub—faciesetc.inEs4stage,BoxingDepressionbelongedtoaclosedlacuslrinebasin,andevolutedfrOmshallowtodeepwaterwithIakedownfaulting。fromdrytohumidinpalaeoclimate.a(chǎn)ndfromoxidationtoreductiveenvironmentfromearlytoendofEs4stage.Thestudyindicatesthatdeltafront.fan—delta
6、front,shore.barandbenthaIfanarepotentialtoreservoir,andtheirdistributioniscontrolledbvfaultactivityinthebasin.Keywords;Boxingdepression,Es4,grain—sizeanalysis,sedimentaryfacies,depositionalenvironment3插圖清單圖2.1博興洼陷構(gòu)造地理位置圖??????.?????..4圖2.2博興洼陷及周邊地區(qū)構(gòu)造區(qū)劃圖??????????7圖2.3高青斷層發(fā)育剖面圖?????
7、????????.9圖2.4搏興洼陷第三系火成巖分布圖??????????.n圖3.1濁流沉積C—M圖????.?????????..17圖3.2牽引流沉積C—M圖?????????????.17圖3.3粒度概率值累積圖及粒度次總體?????????..18圖3.4低斜一段式???????????????..19圖3.5高斜兩段式???????????????..19圖3.7高懸浮三段式???????????????19圖3.8無滾動三段式???????????????19圖3.9四段式?????????????????19圖4.1博興洼陷沙四段沉積構(gòu)造圖(
8、一)?????????28圖4.2博興洼陷沙四段沉積