赵健,张洁,赵俊峰,任康绪,王朝锋,郭渊

• 1:中国石油国际勘探开发公司
• 2:中国石油勘探开发研究院
• 3:中国石油杭州地质研究院

摘要(Abstract)：

桑托斯盆地盐下碳酸盐储层中火成岩分布广泛，以盆地C区块为解剖区，通过对区内火成岩岩石学、年代学以及CO_2气体同位素测试分析等，明确了区内火成岩发育特征，剖析了其对油气成藏的影响。C区块至少经历了阿普特期和圣通-坎潘期2期岩浆活动，其中阿普特期岩浆以喷发岩为主，经历了多次喷发，并伴有多次侵入；圣通-坎潘期岩浆规模较小，侵入比较随机。阿普特期岩浆多次喷发改造古地形，形成局部凸起，促成并控制了Itapema组介壳灰岩的沉积发育，形成了巨厚的火山岩-介壳灰岩复合体，不仅造成了局部构造反转和圈闭高点迁移，而且也促成了Barra Velha组优质微生物灰岩的发育。区块北翼属早期古隆，Barra Velha组也发育一定规模微生物灰岩滩体。圣通-坎潘期及之后岩浆活动伴生的CO_2大规模侵入，对烃类流体进行萃取和抽提改造，形成含凝析油的CO_2气藏。

关键词(KeyWords)： 桑托斯盆地;C区块;火成岩;构造反转;碳酸盐沉积;CO_2含量;成藏模式;巴西

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究”(2016ZX05029005)

作者(Author): 赵健,张洁,赵俊峰,任康绪,王朝锋,郭渊

DOI: 10.19509/j.cnki.dzkq.tb20210489

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