西南石油大学学报（自然科学版）2025，Vol.47Issue(1)：147-162,16.DOI:10.11885/j.issn.1674-5086.2024.08.28.04
曾母盆地古拉让三角洲发育演化定量表征及其控制因素分析
Quantitative Characterization of Evolution and Controlling Factors of Paleo-Rajang Delta in the Zengmu Basin
摘要
Abstract
To clarify the development and evolutionary processes of the large delta complex and slope system on the southern margin of the South China Sea,this paper,based on the interpretation of 2D seismic profile from the region,quantitatively describes the evolution of the Paleo-Rajang Delta in the Zengmu Basin.Key parameters such as the clinoform migration angleα,clinoform accretion thickness to clinoform accretion distance ratio o-,pro-delta width l and pro-delta slope angle β are selected to describe the evolution process of the delta.The study explores the controlling effects of various factors on this process.The main body of the delta has undergone five stages of evolution:1)the early stage of continental shelf delta,forming an oblique prograding clinoforms;2)the rapid advance stage.when the delta evolved to the marginal shelf delta,and the inflection point trajectory of the prograding clinoforms rose at a medium-high angle while l was small but β was large;3)the stable accretion stage.when the depositional center moved to the slope,and the inflection point of the prograding clinoforms rose at a medium angle while the front of l and β were unchanged;4)the stage of slow progradation.when the inflection point of the prograding clinoforms presented a low angle of progradation while l and β gradually decreased;5)late stage of shelf delta progradation.when climatic conditions coupled with source supply and sea level change affected the rate of change of accommodation A and the rate of sediment supply S and ultimately jointly controled the evolution of the deltaic system and its slope migration.关键词
南海/曾母盆地/古拉让三角洲/三角洲复合体/沉积特征/发育模式/控制因素Key words
South China Sea/Zengmu Basin/Paleo-Rajang Delta/delta complex/sedimentary characteristics/development pattern/controlling factors分类
能源科技引用本文复制引用
汤智逸,解习农,徐俊杰,吴佳男,陈北辰..曾母盆地古拉让三角洲发育演化定量表征及其控制因素分析[J].西南石油大学学报（自然科学版）,2025,47(1):147-162,16.基金项目
国家自然科学基金重点项目(42130408) （42130408）
