幕式裂陷控洼背景下的烃源岩分布及岩浆改造——以珠一坳陷番禺4洼为例
Marine Geology & Quaternary Geology（2021）
Abstract
经历裂陷I幕a期强烈裂陷,a期末北部的抬升和岩浆活动,至裂陷I幕b期北洼萎缩、南洼扩大、新形成北西洼,洼陷整体走向从NE-SW转变为NEE-SSW,珠琼运动II幕整体接受抬升剥蚀.在裂陷I幕演化过程中,半深湖-深湖亚相自下而上呈现自NE向SW迁移特征.上文昌组烃源岩面积较大,但仅南部厚度较大,本身湖相有机质含量较高;下文昌组半深湖-深湖亚相烃源岩面积相对较小,北部在I幕a期末被剥蚀后厚度仍较大,南部厚度较小,岩浆活动从某种程度上起到了促进下文昌组有机质成熟、加速成烃的作用.上、下文昌组半深湖-深湖亚相烃源岩具有差异分布的特征,下文昌组的生烃强度优于上文昌组.
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