岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 612.doi: 10.3969/j.issn.1673-8926.2015.05.002
李凤杰,屈雪林,杜凌春,荆锡贵,成晓雨
Li Fengjie, Qu Xuelin, Du Lingchun, Jing Xigui, Cheng Xiaoyu
摘要:
依据野外实测剖面资料,对龙门山甘溪剖面上泥盆统土桥子组沉积相进行了分析,认为土桥子组以碳酸盐缓坡沉积为背景,该组沉积中期,随着海平面的短暂下降,碳酸盐缓坡发生短暂的台地化,其最直接的识别标志是生物礁前的角砾岩及塌积岩沉积的出现。 该剖面土桥子组碳酸盐缓坡包括浅水缓坡和深水缓坡 2 种亚相类型;碳酸盐台地包括台地边缘礁滩和前缘斜坡 2 种亚相类型。 土桥子组碳酸盐岩发育 2 个完整的沉积旋回,这 2 个旋回随着海平面的升降变化,表现出不同的沉积特征。 龙门山上泥盆统甘溪剖面土桥子组碳酸盐缓坡沉积以微晶灰岩—泥灰岩组成的韵律层为特征。
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