Vertical grain-size trend of mouth bar in lacustrine fan delta:Flume experiments

作     者：Ke Zhang Sheng-He Wu Jun-Jie Wang Yun-Jie Xu Zhen-Hua Xu Jia-Jia Zhang 

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing102249China College of GeosciencesChina University of Petroleum(Beijing)Beijing102249China School of GeosciencesYangtze UniversityWuhanHubei 430100China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第5期

页      面：1964-1977页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Science Foundation of China(No.41772101) 

主　　题：Mouth bar Vertical grain-size trend Effluent behavior Inertia Bed friction 

摘      要：Field observational previously indicated a mouth bar of a fan delta could exhibit a fining-or coarseningupward trend,which bring a new challenge to the identification of mouth bar in subsurface studies due to the lack of morphological *** studies have indicated that effluent behavior in rivermouth system can affect the vertical grain-size trend of mouth bar,but the drivers and magnitude of this phenomenon are not *** conducted flume experiments to investigate the mechanism and controlling factors of vertical grain-size trend of mouth *** with a steeper slope of the substrate layer,greater discharge,higher sediment/water ratio,and coarser sediment induced a finingupward trend of mouth bar,because the effluent was dominated by strong *** bar in the experiment with a gentler slope of the substrate layer,smaller discharge,lower sediment/water ratio,and finer sediment exhibited a coarsening-upward trend dominated by the friction-dominated *** relationship between the vertical grain-size trend of mouth bar and the gradients of foreset bedding in small-scale flume models and the cut-off of 15°-18°are applicable in natural *** depositional setting to infer depositional process in river-mouth system and analyzing the plane geometry of sandbodies are two steps in the interpretation of ancient fan deltaic rock record.