辽西低凸起中南段古近系东营组层序地层及地层岩性油气藏勘探意义

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1、学兔兔www.xuetutu.com天气t,-A第33卷第2期OIL&GASGEOLOGY2012年4月文章编号：0253～9985(2012)02—0248—08辽西低凸起中南段古近系东营组层序地层及地层一岩性油气藏勘探意义郭涛，王军，石文龙，郑敬贵，王保全，徐春强[中海石油(中国)有限公司天津分公司，天津300452]摘要：陆相断陷盆地古地貌控砂研究较为成熟，但由同沉积构造的活动及其配置所产生的古地貌动态变化对沉积物砂分散体系控制的研究较少。通过对辽西低凸起中南段东营组构造一层序地层和沉积相开展整体和系统性研究，依据体系域

2、界面和各体系域内三角洲地震反射构型的变化，有效地识别了东二层序的低位、水进和高位3个体系域，建立起研究区高精度层序地层格架。在层序地层单元精细划分对比的基础上，对层序格架内古地貌和沉积体系发育和演化规律进行了研究。研究区主要发育辫状河三角洲、曲流河三角洲、湖底扇和湖泊等沉积体系；辽西低凸起边界断层从北向南依次发育3个调节带，调节带的平面和空间差异活动控制了三角洲朵体的迁移。根据对各体系域砂体特征的描述，在东二层序识别了断层一岩性、上倾尖灭、岩性和地层超覆等4种地层一岩性圈闭类型。关键词：沉积体系；层序地层；地层一岩性圈闭；辽西

3、低凸起中图分类号：TEl22文献标识码：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