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1、學(xué)兔兔www.xuetutu.com天氣t,-A第33卷第2期OIL&GASGEOLOGY2012年4月文章編號:0253~9985(2012)02—0248—08遼西低凸起中南段古近系東營組層序地層及地層一巖性油氣藏勘探意義郭濤,王軍,石文龍,鄭敬貴,王保全,徐春強(qiáng)[中海石油(中國)有限公司天津分公司,天津300452]摘要:陸相斷陷盆地古地貌控砂研究較為成熟,但由同沉積構(gòu)造的活動及其配置所產(chǎn)生的古地貌動態(tài)變化對沉積物砂分散體系控制的研究較少。通過對遼西低凸起中南段東營組構(gòu)造一層序地層和沉積相開展整體和系統(tǒng)性研究,依據(jù)體系域
2、界面和各體系域內(nèi)三角洲地震反射構(gòu)型的變化,有效地識別了東二層序的低位、水進(jìn)和高位3個體系域,建立起研究區(qū)高精度層序地層格架。在層序地層單元精細(xì)劃分對比的基礎(chǔ)上,對層序格架內(nèi)古地貌和沉積體系發(fā)育和演化規(guī)律進(jìn)行了研究。研究區(qū)主要發(fā)育辮狀河三角洲、曲流河三角洲、湖底扇和湖泊等沉積體系;遼西低凸起邊界斷層從北向南依次發(fā)育3個調(diào)節(jié)帶,調(diào)節(jié)帶的平面和空間差異活動控制了三角洲朵體的遷移。根據(jù)對各體系域砂體特征的描述,在東二層序識別了斷層一巖性、上傾尖滅、巖性和地層超覆等4種地層一巖性圈閉類型。關(guān)鍵詞:沉積體系;層序地層;地層一巖性圈閉;遼西
3、低凸起中圖分類號:TEl22文獻(xiàn)標(biāo)識碼:ASequencestratigraphyofthePaleogeneDongyingFormationanditssignificanceforstratigraphic—lithologicreservoirsexplorationinthecentra1.southLiaoxisalientGuoTao,WangJun,ShiWenlong,ZhengJinggui,WangBaoquanandXuChunqiang(CNOOC0nCompany,Tianfin300452,Chi
4、na)Abstract:Thecontrolofpalaeotopographyonthedistributionofsandbodieshasbeenwellstudiedincontinentalriftedbasin,whilethecontrolofpalaeotopographydynamicchangescausedbysyndepositionalstructuremove—mentonthesanddistributionislessstudied.Throughthesystematicstudyoftect
5、onic-sequencestratigraphyandsedimentaryfaciesofthePaleogeneDongyingFormationinthecentral—southLiaoxisalient。theLST.TandHSTarerecognizedinthe2“memberoftheDongyingFormationaccordingtosystemtractboundariesandtheseismicreflectionfeaturesofdeltas.Ahighresolutionsequences
6、tratigraphyframeworkisestablished.Ontheba-sisofthefinedivisionandcorrelationofsequencestratigraphyunit,thepaperstudiedthepalae0top0graphyandthedevelopmentandevolutionofdepositionalsystem.Thestudyrevealsthatbraidedriverdelta,meanderingriverdelta,sublacustrinefanandla
7、kearewelldevelopedinthestudyarea.Therearethreetransformbeltsalongtheboundaryfaultinthesalientfromnoahtosouth.Thearealandspatialvariationofactivityofthetransformbeltsisthekeyfactorcontrollingthemigrationofdeltalobes.Fourtypesofstratigraphic—lithologictraps,includingf
8、ault—lithologictrap,sandstoneupdippinchouttrap,lithologictrapandstratigraphicoverlaptrap,arerecognizedinthe2memberoftheDongyingFormationba