吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (2): 542-552.doi: 10.13278/j.cnki.jjuese.20190104
吴景峰1,2, 蒙启安2, 付晓飞1
Wu Jingfeng1,2, Meng Qi'an2, Fu Xiaofei1
摘要: 汤原断陷构造复杂,后期改造强烈,原型盆地认识不清,导致原始沉积沉降中心不明确,制约了油气勘探的进展。本文从剥蚀量计算入手,分别采用镜质体反射率(Ro)法和地层趋势法,对宝泉岭组、达连河组及新安村组的地层剥蚀量进行计算,结合地震及构造特征,并利用地质建模技术恢复了不同时期的原型盆地形态,通过计算恢复认为:新安村组时期,原始厚度最厚发育在东部边界断裂下降盘,沉积沉降中心被断陷中部低凸起分为南北两个部分,此时期沉积沉降中心位于断陷东部边界断裂中段;达连河组时期,早期的两个沉积沉降中心逐渐合并为一个,断陷西部、南部出现规模较小的沉降带,最厚处依然位于东部断裂带下降盘,而沉积沉降中心迁移至东部边界断裂北段;宝泉岭组时期,早期的两个沉积沉降中心完全合并为一个,断陷西部的沉降带规模扩大,形成一东一西的两个主要沉积沉降中心,沉积沉降中心由一个变为两个。在此基础上,明确了原型盆地格局形态及不同时期沉积沉降中心分布及迁移过程。
中图分类号:
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