松辽盆地长岭凹陷青山口组水下重力流混合事件层沉积特征及意义Sedimentary Characteristics and Significance of the Underwater Gravity Flow Hybrid Event Bed(HEB) in the Qingshankou Formation of the Changling Sag in the Songliao Basin
王旭,胡菲,邢济麟,刘招君
摘要(Abstract):
水下重力流沉积具有复杂多变的沉积过程,扮演了将盆地边缘粗碎屑沉积物输送到湖盆中心的重要角色,深刻影响湖盆中心有机质富集、保存及页岩油成藏。通过对松辽盆地长岭凹陷三口不同沉积环境井位中混合事件层(HEB)沉积特征对比和分析,结果显示各种重力流受物源区供给影响明显,湖盆边缘的L1井分布H1和H3的双层结构,L2井则主要发育过渡流体主导的沉积物组合,L3井发育低密度重力流为主的H4和H5沉积组合。低密度重力流形成一系列粉砂级纹层长英质页岩及泥级纹层黏土质页岩互层(H4和H5组合),有效改善了湖盆中心高TOC、差物性的页岩沉积,平均TOC高达2.84%,OSI平均值达到116.79 mg/g,是湖盆中心发育良好的页岩油甜点层。
关键词(KeyWords): 水下重力流;混合事件层;页岩油;松辽盆地
基金项目(Foundation): 吉林省自然科学基金项目(20230101081JC);; 中国石油集团公司科研项目(JS2021-W-13-JZ-8-16);; 吉林大学科技创新研究团队项目(2021TD-05)
作者(Author): 王旭,胡菲,邢济麟,刘招君
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