渤海西部沙西北斜坡带下古生界潜山储层特征及成藏主控因素
李慧勇 , 肖述光 , 李飞 , 刘凯 , 黄志
地球科学 ›› 2023, Vol. 48 ›› Issue (01) : 329 -341.
渤海西部沙西北斜坡带下古生界潜山储层特征及成藏主控因素
Reservoir Characteristics and Main Controlling Factors of Hydrocarbon Accumulation of Lower Paleozoic Buried-Hill in Northwestern Shaleitian Slope of Western Bohai Sea
,
渤海规模性潜山油气发现集中在山头的太古宇变质岩,而下古生界碳酸盐岩发育在斜坡带,已有地质模式难以解释其成藏规律.运用岩心、薄片、地震、成像测井及分析化验等资料,开展了沙西北下古生界储层特征和成藏主控因素研究.结果表明,该区下古生界碳酸盐岩发育 “缝‒洞”型储层,储集空间受裂缝和岩溶两大因素控制;印支期以来的3期断裂活动形成了连排式构造‒地层圈闭;北侧南堡凹陷生烃灶的超压为成藏提供了强劲的充注条件,新生界披覆式泥岩提供了区域性封盖条件,断块上倾端的致密灰岩为油气在斜坡带成藏提供了遮挡条件.由此建立了 “古储古堵‒超压强注”的斜坡带碳酸盐岩潜山成藏模式,为潜山油气勘探提供了新思路.
渤海湾盆地 / 碳酸盐岩储层 / 多期裂缝 / 成藏条件 / 成藏模式 / 海洋地质学
Bohai Bay Basin / carbonate reservoir / multistage fracture / reservoir forming condition / reservoir forming model / marine geology
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