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摘要: 【研究意义】 东海陆架盆地西湖凹陷平湖斜坡带南部火成岩发育，岩浆活动导致的局部地温升高对烃源岩热演化和砂岩储层次生孔隙形成具有重要影响，同时也是区域构造运动的一个重要指示，对于理解区域地质历史具有重要意义。【目的和方法】 为明确西湖凹陷平湖斜坡带南部盖层火成岩形成期次和分布规律，综合前人研究成果和邻区数据，利用三维地震数据及相关属性，结合钻井、录井和测井资料，分析了火山岩类型、分布地层和范围；通过地层年代学、火山机构形态及其与围岩的接触关系，探讨了火成岩的形成期次。【结果和结论】 研究结果表明：(1) 平南地区火成岩地震相可分为火山通道相、爆发相、溢流相和侵入相，其中盾状火山机构和丘状火山机构最为发育。(2) 岩浆活动可分为三期，中新世末期区域性龙井运动岩浆活动最为强烈，影响范围最广；玉泉组沉积晚期和三潭组沉积早期为局部小规模构造运动，岩浆活动较弱，影响较小。(3) 研究区发育5个与岩浆活动有关的岩性、低幅度披覆背斜和断裂复合圈闭。研究成果为后续西湖凹陷平湖斜坡带南部油气勘探开发提供参考。Abstract: [Research Significance] Cenozoic igneous rocks are well developed in the southern pinghu slope zone of Xihu Depression. Local warming caused by magmatic activity has an important influence on the thermal evolution of source rocks and the formation of secondary pores in sandstone reservoirs, and magmatic activity is also the "pointer" of regional tectonic movement. [Purpose and methods] Based on 3d seismic data, seismic facies, volcanic mechanism and distribution horizon of igneous rocks in Pingnan area were identified and characterized. [Results and conclusions] The following three understandings were obtained in combination with previous studies on regional tectonic evolution: 1) Seismic facies of igneous rocks in the study area can be divided into volcanic channel facies, eruptive facies, overflow facies and intrusive facies. Shield volcanic mechanism and mound volcanic mechanism are mainly developed, and longjing movement accompanied by volcanic activity in the late Miocene. 2) The local warming of magmatic activity is favorable to the thermal evolution of source rocks and the formation of secondary pores in deep consolidated sandstone reservoirs; 3) There are five lithologic traps related to magmatic activity, low amplitude drape anticline and fault compound traps in the study area.
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