岩性油气藏 ›› 2025, Vol. 37 ›› Issue (5): 145154.doi: 10.12108/yxyqc.20250513
• 地质勘探 • 上一篇
刘丽娟1,2, 李军辉1,2, 付秀丽1,2, 白月1,2, 郑强1,2
LIU Lijuan1,2, LI Junhui1,2, FU Xiuli1,2, BAI Yue1,2, ZHENG Qiang1,2
摘要: 通过岩心观察、氩离子抛光-场发射扫描电镜、全岩X射线衍射,锆石U-Pb年龄测试等分析方法,对松辽盆地中央坳陷区白垩系青山口组含火山灰的岩石类型、矿物组分、分布特征及年龄进行了分析,从构造环境、火山喷发期次及全球缺氧事件3个角度对古龙页岩中的有机质富集作用进行了分析。研究结果表明:①松辽盆地青山口组以灰色、灰白色凝灰岩为主,单层厚度为0.5~3.0 cm,矿物成分以黏土(伊蒙混层)为主,质量分数超过50%,其次为菱铁矿、长石和石英,部分可见黄铁矿;凝灰岩与上下岩层呈突变接触或者锯齿状接触关系。②研究区火山灰纵向上主要分布于青一段、青二段,其中青一段火山灰厚度更大,平面上,青一段火山灰厚度表现为“西厚东薄”,青二段火山灰表现为“东厚西薄”;火山灰的平均年龄为93.820 ± 0.240 Ma。③研究区青山口组沉积初期,快速热沉降与拉张应力构造背景的双重作用为火山喷发提供了动力,火山灰的喷发为湖相藻类等生物的繁殖及有机质的富集提供了营养物质;青一段、青二段页岩层系至少发育6期火山灰沉积,代表了6期火山喷发事件,青一段Q1层系的火山灰由盆地西部周缘岩浆喷发而形成,青二段火山灰主要来源于盆地东部火山喷发物质。④研究区青山口组火山灰的形成时间与全球缺氧事件OAE2的时间(93.6~94.3 Ma)一致,火山灰带来的营养物质为随后0.04~0.08 Ma的生物勃发和有机质富集提供了重要保障。
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