西湖凹陷弱调节型NW向断裂对油气成藏的控制作用

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中图分类号：P542 文献标识码：A 文章编号：2097-5465（2025）04-0049-06

中海石油（中国）有限公司上海分公司，上海200335

Shanghai

Abstract：Thenorthwest（NW）-trendingfaultsintheXihuDepresioncanbecategorizedintothre types：deepandlargefaults dominatedbyjoints，structuraltransformationfaultswithweakregulationand tension-inducedfracturesasociatedwithanticlinal cores.Thisstudyinvestigatesthereservoir-controlingoleofweaklyregulatedNW-trendingfaultsinstructuraltransforation zones.TheresultsdemonstratethatthedeeplayersoftheQ2structurearejointlycontroledbyNE-andNW-trendingfaults， whereastheshallowlayersareprimarilyinfluencedbyNW-trendingfaults.TheNE-trendingfaultsexhibithighdensityandmultiple phasesofactivity.Furthermore，thedevelopmentofupper-layerNW-trendingfaults（F2）iscloselycorelatedwithlower-layer faults（F1）．Weaklyregulatedfaultsfmedarlybutexperiencdlimitedlate-stagereactivation，inderingtheformationofshalow resurfacing faults.HydrocarbonmigrationintheQ2structureoccurspredominantlyalongverticalpathways，withNE-trendingfaults servingastheprimaryconduits.Incontrast，NW-trendingfaultsplayacriticalroleintrapdevelopmentandexhibitstrongsealing capacity，therebycontrolinglocalizedhydrocarbonacumulation.WeaklyregulatedNW-trendingfaultsareommonlydeveloped withinthetranstionzneofthecentralanticlinebelt.Themid-to-deplowamplitudeanticlinesifluencdbythesefultsrepesent apromising target for future hydrocarbon explorationin the Xihu Depression.

Keywords：Xihu Depression；structural reservoir control；weaklyregulatedNW-trending fault

0 引言

在中国东部近海普遍发育的走滑-拉分盆地中，与现今主控断裂近共轭相交的调节断裂带起到了重要的控藏作用，针对该类型的研究也一直是油气勘探的热点[1-2]。（剩余6105字）