岩性油气藏 ›› 2015, Vol. 27 ›› Issue (1): 95101.doi: 10.3969/j.issn.1673-8926.2015.01.014
杨雪飞 1,2,3,王兴志 1,2,3,代林呈 1,2,3,杨跃明 4,谢继荣 4,罗文军 4
YANG Xuefei 1,2,3,WANG Xingzhi 1,2,3,DAI Lincheng 1,2,3,YANG Yueming 4,XIE Jirong 4,LUO Wenjun 4
摘要:
结合四川盆地下寒武统龙王庙组区域地质资料,以及川中地区录井、测井及岩心等资料,探讨了研究区龙王庙组的沉积特征及沉积相展布。 研究认为:川中地区在早寒武世龙王庙组沉积期位于陆表海碳酸盐局限—蒸发台地内,包括局限泻湖、台内滩、台坪和混积潮坪等 4 种亚相。 龙王庙组沉积期经历了 2 次海侵—海退旋回,纵向上发育了 2 套完整的泻湖—台内滩—台坪—混积潮坪沉积组合,分别对应于龙王庙组上段和下段。 泻湖亚相发育于各段底部,具有水体局限和能量弱的沉积特征;台内滩亚相发育于各段中部,分别沉积了一套厚层砂屑白云岩和鲕粒白云岩,在研究区分布稳定;台坪亚相发育于各段中上部,沉积物以浅色细晶粒白云岩为主,具有沉积水体浅且易暴露的沉积环境特征;混积潮坪亚相仅发育于各段顶部,为海退最晚期的沉积产物。受龙王庙组沉积期乐山—龙女寺水下古隆起的影响,川中地区位于水下隆起斜坡部位,水动力整体较强,其沉积相分布与水下古隆起密切相关。
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