济阳坳陷沾化凹陷异常高压与油气成藏模式

济阳坳陷沾化凹陷异常高压与油气成藏模式

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学兔兔www.xuetutu.com-5天然气北第32卷第4期OIL&GASGE0L0GY2011年8月文章编号:0253—9985(2011)04—0601—05济阳坳陷沾化凹陷异常高压与油气成藏模式徐东锋,赵红佳,刘见宝(1.中国石油大庆油田有限责任公司装备制造研究院,黑龙江大庆163311;2.中国科学院广州地球化学研究所,广东广州510640;3.中国科学院研究生院,北京100049)摘要:渤海湾盆地济阳坳陷沾化凹陷沙河街组二段及其以上层段,圈闭类型以构造为主;沙河街组三段及其以下地层,主要发育岩性、构造一岩性等隐蔽圈闭。地层压力的分布与油气分布特征存在一定的对应关系,即正常压力带发育构造油气藏,而异常高压带多发育岩性等油气藏。异常高压为深层岩性油气藏油气的运移提供了动力。凡压力系数曲线呈现“3”字形,则相对低压油层含油性较好。根据压力与油气成藏的关系,建立了“源外断裂输导成藏”和“源内高压充注成藏”两种成藏模式。油源断层是浅部源外常压油气成藏的主控因素,沙河街组三段中、下亚段及沙河街组一段生成的油气,主要沿断层经垂向输导进入沙河街组二段及其以上地层,直接在断块、滚动背斜等构造圈闭中充注成藏,或经横向运移在构造圈闭中充注成藏。油气成藏动力是深部源内高压成藏的主控因素,沙河街组三段中、下亚段生成的油气,在异常高压的驱动下直接向其紧邻的砂岩体及构造一岩性圈闭中充注成藏。关键词:异常高压;圈闭;油气成藏;成藏模式;沾化凹陷;渤海湾盆地中图分类号:TE122.3文献标识码:AAbnormalpressureandhydrocarbonreservoiringpatternoftheZhanhuasaginJiyangDepressionXuDongfeng.ZhaoHongjiaandLiuJianbao,(1.InstituteofEquipmentManufacturing,CNPCDaqingOilfieldBranchCorporation,Daqing,Heilongfiang163311,China;2.GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou,Guangdong510640,China;3.GraduateUniversityofChinaAcademyofSciences,Being100049,China)Abstract:InZhanhuasagofJiyangDepressioninBohaiBayBasin,structuraltrapsarepredominantinthesecondmemberoftheShahejieFormationandthestrataaboveit,whilesubtletrapssuchaslithologicandstruc-tural-lithologictrapsdominatethethirdmemberoftheShahejieFormationandthestratabelowit.Thereisacertaincorrelationbetweenformationpressuredistributionandhydrocarbondistributioninthearea,i.e.,struc—turalreservoirsoecu~inginareaswithnormalpressurewhilelithologicreservoirsbeingdevelopedinareaswithabnormalhighpressure.Abnormalhighpressureprovidesimpetusforthemigrationofhydrocarbonsindeepli-thologicreservoirs.Whenthepressurecoefficientcurvepresentsa“3”一shape.reservoirswithrelativelylow-pressurehavehigheroilpotentials.Basedontherelationshipbetweenformationpressureandhydrocarbonaccu—mulation.wesetuptwoaccumulationmodels:“external—sourcedhydrocarbonsaccumulatingviacarrierfaults”and“internal—sourcedhydrocarbonaccumulatingviahigh-pressureinjection”.Shallowexternal-sourcedhydro—carbonaccumulationswithnormalpressurearemainlycontrolledbysourcerock—rootedfaults.Forexample,thehydrocarbongeneratedfromthelowerandmidpartsofthethirdmemberoftheShahejieFormationmigratesver-ticallyalongthefaultsandaccumulatesinthestructuraltrapssuchasfaultblockandrollinganticlinesinthesecondmemberoftheShah~ieFormaitonandstrataaboveit,ormigrateslaterallytoandaccumulatesinstrue—turaltraps.Thecontrollingfactorforthesecondpoolingmodelisabnormalhighpressure.Hydrocarbonsgenera-tedfromthelowerandmidpartsofthethirdmemberoftheShah~ieFormationmaybechargedintoadjacentsandbodiesandstructural—lithologictrapsunderthedriveoftheabnormalhighpressure.收稿日期:2011—05—23。第一作者简介:徐东锋(1979一),男,工程师,石油地质。 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