岩性油气藏 ›› 2024, Vol. 36 ›› Issue (1): 121135.doi: 10.12108/yxyqc.20240112
孙汉骁1, 邢凤存1,2, 谢武仁3, 钱红杉4
SUN Hanxiao1, XING Fengcun1,2, XIE Wuren3, QIAN Hongshan4
摘要: 综合利用野外露头、岩心、钻测井等资料,对四川盆地及周缘地区晚奥陶世岩相古地理演化过程进行了描述和对比,并探讨了其主控因素。研究结果表明: ①加里东运动早期拉张—伸展作用导致四川盆地周缘坳陷加深,其后扬子板块和华夏地块碰撞挤压,形成了晚奥陶世以上扬子地区为中心,西北、西部、南部三面环隆的古地理格局。②四川盆地及周缘地区晚奥陶世可划分出(混积)滨岸、碳酸盐缓坡、(混积)陆棚相等沉积相类型。宝塔组—临湘组主要发育碳酸盐缓坡相;五峰组沉积期海侵达到高峰,碳酸盐缓坡被淹没,发育(混积)陆棚相深水黑色页岩;观音桥组沉积期发生的海退导致大部分地区由深水陆棚转为浅海陆棚亚相;各时期古隆起周缘均有(混积)滨岸相发育,受物源影响部分地区具有混合沉积特征。③研究区晚奥陶世岩相古地理格局受构造运动、海平面变化和古气候等因素综合控制,在沉积相平面展布和垂向演化上均有体现。
中图分类号:
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