黄骅坳陷下古生界深潜山油气聚集条件及成藏因素分析

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1、学兔兔www.xuetutu.com中国石油勘探第l8卷第4期CHINAPETR0LEUMEXPLORATION2013年7月DOI：10．3969／j．issn．1672-7703．2013．04．002黄骅坳陷下古生界深潜山油气聚集条件及成藏因素分析球方杰吴小洲王居峰(中国石油勘探开发研究院地质所，北京100083)摘要：黄骅坳陷各洼槽区断裂发育，深潜山带构造类型多，分布面积广，且沙二一三段和石炭系一二叠系两套烃源岩热演化程度高，成藏条件有利；下古生界储集岩受潜山上覆地层分布范围及受剥蚀程度差异、断裂发育程度和潜流带发育程度这3种因素影响，其部分深潜山构造带上碳酸盐

2、岩岩溶带也比较发育，故下古生界深潜山带具备了油气聚集有利条件。尤其是深潜山还具备5个有利成藏因素：即油气充注期较早，油气运移距离近，多期捕获油气，深层气多、储集条件要求较低，油气后期保存条件优越；但该区深潜山形成油气富集的关键因素取决于“供油窗”的存在或发育程度。南大港和港东两个深潜山带是重点目标区，但要解决的关键问题为：前者是南大港断裂和歧北断裂一侧下古生界碳酸盐岩地层是否存在“供油窗”；后者是奥陶系潜山圈闭是否落实。关键词：油气聚集条件，成藏因素；深潜山；下古生界；黄骅坳陷；渤海湾盆地中图分类号：TEl12．2文献标识码：AAccumulationCondition

3、sandReservoiringFactorsofDeepBuriedHillsofLowerPaleozoicinHuanghuaDepressionFangJie，WuXiaozhou，WangJufengesearchInstituteofPetroleumExploration＆Development,Beijing10008Abstract：FaultsdevelopedinalltroughsinHuanghuaDepression，andtherearemanytypesofstructuresindeepburiedhills．Moreover,twos

4、etsofsourcerocksfromtheSecondtothethirdmemberofShahejieFormationorCarboniferous—Permianhavehigherthermalevolutiondegreeandgoodreservoiringconditions．TheLowerPaleozoicreservoirrocksareafectedbythreefactorsastheburied—hilloverlyingstratadistributionrangeanddiferentdenudationdegree，thefault

5、sdevelopmentdegree，andtheunderflowzonedevelopmentdegree．Alsocarbonatepalaeokarstdevelopedinsomedeeplyburiedhills．SodeeplyburiedhillsinLowerPaleozoicarefavorableforhydrocarbonaccumulation．Especially,therearefivefactorsfavorableforreservoiring，thatis，theearlierhydrocarbonchargestages，thesm

6、allermigrationdistance，themultiphasesofoil／gas~apping，thegreatamountofgasinthedeepandlowerdemandforaccumulationconditions，andthesuperioroil／gaspreservationconditionsinlaterstage．Howeve~thekeyfactorofoil／gasenrichmentintheareadependsonthepresenceorgrowthdegreeof“oil—supplying”window．Twode

7、eplyburiedhillstructuresofNandagangandGangdongarethemajortargetsofoilandgasexploration，butthekeyproblemstobesolvedare：thereisanoil-supplyingwindowinLowerPaleozoiccarbonatestratainNandagangfaultandonesideofQibeifaultornot；whetherthetrapsinOrdovicianburiedhillsarefulfilledo