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The influence of water level changes on sand bodies at river-dominated delta fronts:The Gubei Sag,Bohai Bay Basin

Petroleum Science 2022年第1期19卷 58-73页

作者： Yang Zhang Zheng Shi Ji Li Jun-Wei Wang Bao-Liang Yang Ji-Guo Jiang Faculty of Petroleum China University of Petroleum(Beijing)Karamay CampusKaramayXinjiang834000China College of Resources and Environmental Engineering Guizhou Institute of TechnologyGuiyangGuizhou550003China Experiment Testing Institute PetroChina Xinjiang Oilfield CompanyKaramayXinjiang834000China Research Institute of Exploration and Development PetroChina Xinjiang Oilfield CompanyKaramayXinjiang834000China School of Geosciences China University of PetroleumQingdaoShandong266580China Zhuangxi Oil Production Plant Sinopec Shengli Oilfield CompanyDongyingShandong257000China

changes in water level are one of the important factors controlling the constructive characteristics of *** paper studies the influence of water level changes on sand bodies in the third member of the Shahejie Formation(Es3)on the gentle southern slope of the Gubei Sag,Bohai Bay Basin and draw some conclusions that,for complex sand bodies,with the increase in water level the distributary channels bifurcate frequently,from a simple branching shape to a network shape along with the increase in the development of crevasse splays,mouth bars and sheet *** single sand bodies,with an increase in water level in the slope zone of the lake basin close to the source area,the superimposition style transitioned from vertical cutting-stacking and lateral isolation to vertical stitching,isolation and lateral ***,in the central zone of the lake basin far from the source area,the superimposition style transitioned from vertical stitching and lateral stitching to vertical isolation and lateral *** water level stays stable,the greater the distance from the source area the greater the disaggregation ratio of a single sand *** the same distance from the source area,higher water level tends to result in greater disaggregation ratio of a single sand body.

关键词： water level changes River-dominated delta Delta front sandbodies Paleogene Shahejie Formation Gubei Sag of Bohai Bay Basin

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Relationship Between changes of River-lake Networks and water levels in Typical Regions of Taihu Lake Basin,China

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Chinese Geographical Science 2012年第6期22卷 673-682页

作者： YIN Yixing XU Youpeng CHEN Ying Applied Hydrometeorological Research Institute Nanjing University of Information Science and Technology Nanjing 210044 China School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China College of Geographic Sciences Fujian Normal University Fuzhou 350007 China

The typical regions of the Taihu Lake Basin,China,were selected to analyze the variation characteristics of river-lake networks under intensive human *** characteristics of the fractal dimension of river networks and lakes for different periods were investigated and the influences of river system evolution on water level changes were further explored through the comparison of their fractal *** results are as follows:1) River network development of the study area is becoming more monotonous and more simple;the number of lakes is reducing significantly,and the water surface ratio has dropped significantly since the 1980s.2) The box dimension of the river networks in all the cities of the study area decreased slowly from the 1960s to the 1980s,while the decrease was significant from the 1980s to the *** variations of lake correlation dimension are similar to those of the river network box *** is unfavorable for the storage capacity of the river networks and lakes.3) The Hurst exponents of water levels were all between 0.5 and 1.0 from the 1960s to the 1980s,while decreased in the 2000s,indicating the decline in persistence and increase in the complexity of water level *** paper draws a conclusion that the relationship between the fractal dimension of river-lake networks and the Hurst exponents of the water level series can reveal the impacts of river system changes on flood disasters to some extent:the disappearance of river networks and lakes will increase the possibility of flood occurrence.

关键词： river network lake water level changes fractal Taihu Lake Basin

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