断陷盆地继承性斜坡断砂耦合控藏机制——以沧东凹陷南皮斜坡孔二段为例.docx

断陷盆地继承性斜坡断砂耦合控藏机制——以沧东凹陷南皮斜坡孔二段为例
摘要：
沧东凹陷是华北地台东缘大型、复杂的斜坡断陷盆地之一，其南部的南皮斜坡是典型的继承性斜坡断陷。本文在对南皮斜坡孔二段地质特征进行分析的基础上，探究了断陷盆地继承性斜坡断砂耦合控藏机制。结果表明，南皮斜坡孔二段具有单一的断层控制，主断层为南皮断层，次级断层为斜坡内横向侵蚀型断层。断层活动对孔二段砂体分布具有重要影响，沉积物质的主要供应于北部隆起地区，并在南皮、阳店等断层上发生挤压和摩擦作用，从而造成水力断层活动，形成孔二段砂体。综合分析表明，南皮斜坡孔二段的油气藏形成和保存是由构造运动、断层活动及沉积物质来源共同作用的结果。南皮断层的活动导致断层滑移，形成裂隙和小型破碎带，为储层提供了储存空间和流动通道。因此，本次研究成果可为沧东凹陷南皮斜坡地区油气勘探和开发提供科学依据。
关键词：断陷盆地；继承性斜坡断陷；断砂耦合控藏机制；南皮斜坡孔二段
Abstract:
CangdongDepressionisoneofthelargeandcomplexslope-faultedbasinsintheeasternmarginoftheNorthChinaPlatform.ThesouthernNanpiSlopeisatypicalhereditaryslopefault.BasedontheanalysisofthegeologicalcharacteristicsoftheK2intervalintheNanpiSlope,thispaperexploresthecouplingmechanismsbetweenfaultsandsandstonereservoirsininheritingslope-faultedbasins.TheresultsshowthattheK2intervaliscontrolledbyasinglefault―theNanpiFault―withthesecondaryfaultsbeingthetransverseerodedfaultswithintheslope.FaultactivityhasanimportantimpactonthedistributionofsandbodiesintheK2interval.SedimentsupplymainlycomesfromthenorthernupliftedareaandthesqueezingandfrictionalactiontakesplaceontheNanpiandYangdianfaultstocausehydraulicfaultactivityandformsandbodiesintheK2interval.ComprehensiveanalysisshowsthatbothtectonicactivityandsedimentarymaterialsareimportantfactorsintheformationandpreservationofoilandgasreservoirsintheK2intervalontheNanpiSlope.TheactivityoftheNanpiFaultleadstoaslipofthefault,formingfracturesandsmall-scalefragmentationzonesandprovidingstoragespaceandflowchannelsforthereservoir.Therefore,theresultsofthisstudycanprovidescientificbasisforoilandgasexplorationanddevelopmentintheNanpiSlopeareaofCangdongDepression.
Keywords:Faultedbasin;Hereditaryslopefault;Couplingmechanismoffaultandsandreservoir;K2intervalofNanpiSlope.