珠江口盆地西江主洼烃源岩属性、原油分类及成藏主控因素
彭光荣 , 张丽丽 , 许新明 , 邱欣卫 , 何金海 , 刘昭茜
地球科学 ›› 2023, Vol. 48 ›› Issue (06) : 2361 -2375.
珠江口盆地西江主洼烃源岩属性、原油分类及成藏主控因素
Source Rock Attribute, Oil Classification and Hydrocarbon Accumulation Main Control Factors of Xijiang Main Sag in Pearl River Mouth Basin
,
位于珠一坳陷西江凹陷北部的西江主洼具有古地温梯度低、恩平组泥岩厚度大、岩浆作用多等特殊地质特征,导致其主力烃源岩潜力、原油类型和来源、油气聚集规律和成藏主控因素等复杂性.基于烃源岩有机地球化学特征和分布、原油分类、来源及分布规律、原油聚集与岩浆和断裂关系等分析,开展烃源岩分布及潜力、原油成藏规律及主控因素研究.明确了西江主洼发育文昌组下段的文4段和文昌组上段的文3段两种属性差异的中深湖相烃源岩,且改造作用强、供烃能力有差异.成藏原油可分为两种类型,其来源和空间分布存在差异,类型1原油来自于文4段烃源岩,裂陷层和拗陷层均有成藏,横向运移距离远.类型2原油来自于文3段烃源岩,裂陷层成藏,近洼聚集.成藏主控因素为烃源岩和断裂,文昌组烃源岩属性差异、体量控制了原油类型、成藏级别和运移距离.NE向断层因延走向的分段、分时活动速率变化控制烃源岩发育和展布;NWW-近EW向断裂控制文3段烃源岩,且为近洼处裂陷层成藏断层,为远洼处西江中低凸起拗陷层成藏断层.成藏模式可总结为:烃源控聚、断裂控层、岩浆控富.
烃源岩 / 原油分类及来源 / 成藏主控因素 / 西江主洼 / 珠江口盆地 / 石油地质
source rock / oil classification and oil origin / hydrocarbon accumulation main control factor / Xijiang main sag / Pearl River Mouth basin / petroleum geology
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中海油深圳分公司重大生产科研项目(SCKY-2020-SZ-21)
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