2024 06 v.54 1078-1090
鄂尔多斯盆地三叠系延长组长10—长8段沉积演化特征
基金项目(Foundation):
国家科技重大专项(2017ZX05001)
邮箱(Email):
DOI:
10.16152/j.cnki.xdxbzr.2024-06-012
中文作者单位:
低渗透油气田勘探开发国家工程实验室/中国石油长庆油田分公司勘探开发研究院;
摘要(Abstract):
通过分析鄂尔多斯盆地延长组长10—长8段沉积期地层发育特征、碎屑充填结构变化、沉积相展布，并结合岩石学、元素地球化学分析，提出受秦岭造山作用的影响，长10—长8段沉积期为鄂尔多斯盆地强烈沉降成盆期、台-盆发展转换期、气候环境转折期：(1)明确长10段沉积期发生了显著的沉降作用，沉降中心位于盆地西南环县—镇原—正宁一带，不对称性显著，粗碎屑快速充填，厚度巨大，长9段、长8段沉积期是构造平稳阶段气候控制为主的沉积，沉积物粒度相对较细；(2)提出长10期沉降作用结束了晚古生代稳定的地台性质的沉积，开始了内陆盆地演化阶段，在碎屑沉积物的成熟度、供屑原岩特征等方面均留下了造山带构造活动影响下的台-盆转化与盆地演化的示踪信息；(3)长10段沉积期结束了晚二叠世以来长期的干旱炎热的气候，经历了半干旱、半潮湿向温暖湿润气候转变；(4)长10—长8段构成了延长组下部沉降-充填旋回，该旋回在沉降中心厚1 000～1 550 m,具有粗碎屑快速充填、颗粒向上变细的特点。本研究深化了鄂尔多斯盆地形成、演化的认识。
关键词(KeyWords):
长10—长8段;长10沉降作用;台-盆转化;气候转折;鄂尔多斯盆地演化
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基本信息:
DOI：10.16152/j.cnki.xdxbzr.2024-06-012
中图分类号:P618.13
引用信息:
[1]邓秀芹,庞锦莲,孙勃.鄂尔多斯盆地三叠系延长组长10—长8段沉积演化特征[J].西北大学学报(自然科学版),2024,54(06):1078-1090.DOI:10.16152/j.cnki.xdxbzr.2024-06-012.
基金信息:
国家科技重大专项(2017ZX05001)