塔里木板块北部轮南油田中-晚奥陶世之交海进序列的岩相特征TRANSGRESSIONAL SEQUENCES THROUGHOUT THE MIDDLE TO UPPER ORDOVICIAN TRANSITION IN THE LUNNAN OIL FIELD, NORTHERN TARIM BLOCK
张园园,李越
摘要(Abstract):
本文分析轮南油田中奥陶统一间房组-上奥陶统吐木休克组灰岩生物多样性、沉积序列和时空展布,显示水深加大是控制地层分界上下岩相-生物相变化的主要因素。中奥陶统一间房组台地相沉积期,水体深度多在正常浪基面附近,岩性以中-高能滩相的砂屑生屑灰岩、砂屑灰岩为主并伴有小型台缘礁。从一间房组上部到上奥陶统吐木休克组,生物相-岩相有明显变化,总体表现为水体加深。吐木休克组发育深水缓斜坡型灰岩沉积,向南连接满加尔凹陷,红色灰岩岩性变化小,生屑和内碎屑含量少,灰泥含量显著增加。轮南油田中-晚奥陶世经历了一次从浅海台地演变为沉没台地的持续性海进过程,其岩相转换的时间节点基本与塔里木板块西北巴楚露头区一致,均发生在整合接触的中奥陶统一间房组-上奥陶统吐木休克组界线附近。
关键词(KeyWords): 灰岩;海进;奥陶系;轮南油田;塔里木板块
基金项目(Foundation): 自然科学基金青年基金(750100509);; 中国科学院战略性先导科技专项(B类,XDB26000000)联合资助
作者(Author): 张园园,李越
DOI: 10.19839/j.cnki.dcxzz.2020.0002
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