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;L_(4)油组底部L_(4)^(4)小层为辫曲共生模式;L_(4)^(2)~L_(4)^(0)小层为高弯度曲流河模式;L_(3)^(2)小层为限制性曲流河模式;L_(3)^(0)小层为串珠状曲流河模式;L_(2)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。
[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 paleontological,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 L_(4)^(4) sublayer is a braidedmeandering symbiotic model.The river type of the L_(4)^(2)-L_(4)^(0) sublayer is a high-curvature meandering river.The river type of the L_(3)^(2) sublayer is a restricted high-curvature meandering river.The river type of the L_(3)^(0) sublayer is a string-beads meandering river.The river type of the L_(2) 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.
作者
徐中波
刘英宪
林国松
姚元戎
甘立琴
XU ZhongBo;LIU YingXian;LIN GuoSong;YAO YuanRong;GAN LiQin(Tianjin Branch,CNOOC(China)Co.,Ltd.,Tianjin 300452,China;CNOOC International Ltd.,Beijing 100028,China)
出处
《沉积学报》
CAS
CSCD
北大核心
2024年第3期994-1002,共9页
Acta Sedimentologica Sinica
基金
国家科技重大专项(2016ZX05058001)。
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
low-curvature meandering river under lake-level
restricted meandering river
high curvature meandering river
beaded meandering river
braided-meandering symbiotic river
作者简介
第一作者:徐中波,男,1984年出生,硕士,高级工程师,油气田开发,E-mail:xuzhb2@cnooc.com.cn。
