摘要
古地貌是控制古水系、沉积体系的关键因素之一.以渤海湾盆地渤中坳陷东部的辽东东地区中新世馆陶组为例,对馆陶组的沉积区和剥蚀区分别开展了基于残余地层厚度法和印模法的古地貌恢复,以增进对研究区古水系、源-汇系统的整体认识,为其物源体系、沉积环境、砂体分布的预测提供科学依据.两种方法的古地貌及古水系恢复结果对比研究表明,基于残余地层厚度法的沉积区古地貌恢复结果适用于目的层沉积区古水系的恢复;而基于印模法的沉积区-剥蚀区一体化的古地貌恢复结果实现了剥蚀区、沉积区古水系的统一解释.沉积区-剥蚀区一体化的古地貌恢复弥补了基于沉积区古地貌的古水系恢复中难以判断"源-汇体系"中源区古水系分布及从源到汇古水系派生关系的局限性.
Paleo-geomorphology is one of key controls on paleo-drainage and depositional systemson.In order to better understand the paleo-drainage system and Source-to-Sink system to provide scientific evidences for predictions of provenance system,deposition system and sand stone distribution,the paleo-geomorphology of the Guantao Formation in East Liaodong area,East Bozhong depression of Bohai bay basin are reconstructed using two methods in this paper.Comparison of paleo-morphological reconstruction and paleo-drainage interpretation with different methods shows that paleo-morphology restoration of deposition area using residual thickness may be used in understanding of paleo-drainage outlines for deposition area only.However,paleogeomorphology restoration for depositional area and erosional areas provides a comprehensive paleo-drainage interpretation for depositional and erosional areas taken as a whole.The integrated paleo-morphology restoration can facilitate the prediction of paleo-drainage distribution in source area of＂Source-to-Sink system＂,and establishment of relationship of paleo-drainage systems from source area to sink area.
出处
《地球科学（中国地质大学学报）》
EI
CSCD
北大核心
2017年第11期1922-1935,共14页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(Nos.41172104
41372117
41702104)
国家油气重大专项(Nos.2017ZX05009002
2016ZX05026007)
关键词
古地貌
古水系
物源体系
源-汇系统
辽东东地区
石油地质.
paleo-geomorphology
paleo-drainage system
provenance system
Source-to-Sink system
East Liaodong
petroleum geology.
