古地理学报Issue(5)：569-580,12.DOI:10.7605/gdlxb.2014.05.046
三角洲沉积模式存在的问题与讨论
Problems and discussions about delta depositional models
金振奎 1高白水 1李桂仔 1刁丽颖 1闫伟 1李燕 1张淼2
作者信息
- 1. 中国石油大学 北京 中石油储集层重点研究室，北京 102249
- 2. 中国石油新疆油田分公司彩南油田作业区，新疆阜康 831511
- 折叠
摘要
Abstract
Deltas are an important type of sedimentary facies,and are also good reservoirs for oil and gas.A reliable depositional model of deltas is an essential guide for oil and gas exploration and develop-ment.However,few people have ever queried the classical delta model and relevant concepts in textbooks. But through our study,it is found that there exist many problems about the depositional model and relevant concepts.For example,definitions of delta plain,delta front and prodelta are vague,while the bounda-ries between them are not well defined and hard to determine.The boundary between delta plain and delta front is sea (or lake) level,but the level fluctuates frequently due to tide (or alternating raining and dr-ying seasons),so which level should be the boundary?Similarly,the boundaries between delta plain and fluvial plain,delta front and prodelta, as well as prodelta and normal sea (lake ) are also inexplicit. Their characteristics and distinctions have not been systematically summarized.Thus different researchers may give different interpretations as to sedimentary environments for the same strata.There are various types of deltas,and each type should have its own depositional model.However,many researchers have tried to apply the meandering delta model to all deltas.In the classical model,delta front develops suba-queous distributary channels and subaqueous levees,but this is proved to be wrong by the authors'work in this paper.On delta plain,some new types of sandbodies,branch-mouth bars and branch-coalesce bars are found,but they are not mentioned in the classical delta model.In this paper,the problems within del-ta models are discussed in depth,and especially the distinction characteristics for subfacies and microfa-cies of deltas are summarized on the basis of modern deltas study.关键词
三角洲/沉积模式/三角洲上平原/三角洲下平原/三角洲内前缘/三角洲外前缘/水下分支河道Key words
delta/depositional model/upper delta plain/lower delta plain/delta inner front/delta outer front/subaqueous distributary channel分类
天文与地球科学引用本文复制引用
金振奎,高白水,李桂仔,刁丽颖,闫伟,李燕,张淼..三角洲沉积模式存在的问题与讨论[J].古地理学报,2014,(5):569-580,12.
