曲流河沉积模式及演化规律研究——以渤海湾盆地L油田明下段为例
Sedimentary Model and Evolution Law of Meandering Rivers:A case study from the lower Minghuazhen Formation of L oilfield in Bohai Bay Basin
徐中波 1刘英宪 1林国松 2姚元戎 1甘立琴1
作者信息
- 1. 中海石油(中国)有限公司天津分公司,天津 300452
- 2. 中国海洋石油国际有限公司,北京 100028
- 折叠
摘要
[目的]L油田明下段发育多种曲流河模式,其沉积模式和演化规律尚不明确.[方法]综合利用古生物资料、岩心、壁心、测井、地震等资料,对明下段各时期的曲流河特征、古地质背景进行了系统分析,并进一步总结了明下段曲流河的演化规律.[结果]明下段沉积时期,研究区先后发育了五种曲流河模式;L4油组底部L44小层为辫曲共生模式;L24～L04小层为高弯度曲流河模式;L23小层为限制性曲流河模式;L03小层为串珠状曲流河模式;L2油组主力储层为低弯度入湖曲流河模式.[结论]明下段时期,研究区古地质背景也不断发生演化,受沉积基准面旋回、古气候、古地貌、沉积区水体环境等古地质因素耦合作用影响,形成了不同时期多种类型的曲流河模式.
Abstract
[Objective]There are many meandering river depositional models in the lower Minghuazhen Formation in L oilfield.Their sedimentary models and evolutionary laws are not yet clear.[Methods]The meandering river characteristics and their paleogeological background in different periods are systematically analyzed by using paleo-ntological,core,sidewall core,well logging data,and seismic data.Then,the evolution law is summarized.[Results]The study shows that during the sedimentary period of the lower Minghuazhen Formation,there are 5 types of meandering rivers developing successively in the study area.The river type of the L44 sublayer is a braided-meandering symbiotic model.The river type of the L24-L04 sublayer is a high-curvature meandering river.The river type of the L23 sublayer is a restricted high-curvature meandering river.The river type of the L03 sublayer is a string-beads meandering river.The river type of the L2 oil group is a low-curvature meandering river under lake-level.[Conclusions]During the sedimentary period of the lower Minghuazhen Formation,the paleogeological background of the studied area also evolved continuously.Because of the coupling effect of different paleogeological factors,such as sedimentary base level cycles,paleoclimate,paleogeomorphology,and the water environment in sedimentary area,various types of meandering rivers were formed in the different periods.
关键词
低弯度入湖曲流河/限制性曲流河/高弯度曲流河/串珠状曲流河/辫曲共生Key words
low-curvature meandering river under lake-level/restricted meandering river/high curvature meandering river/beaded meandering river/braided-meandering symbiotic river引用本文复制引用
基金项目
国家科技重大专项(2016ZX05058001)
出版年
2024
国家科技期刊平台
NSTL
万方数据