摘要
东营凹陷沙三中亚段广泛发育三角洲-浊积体系沉积。根据砂层组沉积的垂向变化特征,将沙三中亚段沉积时期东营三角洲自上而下划分为1～9期次,自东向西向湖盆中心进积。与三角洲有关的前缘浊积体包括滑动浊积岩、滑塌浊积岩及远源浊积岩3种类型,其中滑塌浊积岩发育的规模、数目最为稳定,是前缘浊积体定量研究的重要类型。笔者采用控制变量的方法对单因素关系进行探讨,进而分析多因素综合关系,对沙三段中亚段沉积时期东营三角洲前缘浊积体进行定量研究,从而探讨三角洲沉积结构与前缘滑塌浊积体发育的定量关系。研究发现,三角洲沉积结构特征(三角洲前缘地层厚度H、砂岩百分含量x等)、浊积岩滑移距离s以及三角洲前缘斜坡坡角的大小α,可以定量地确定,并且三角洲前缘滑塌浊积体发育的厚度h与前缘厚度H、前缘砂岩百分含量x成正相关,与浊积体滑移距离s呈负相关,并且得到预测三角洲前缘浊积体厚度h的数学模型。
Delta-turbidite depositional system is extensively developed in the Dongying Sag in the middle Es3,according to the vertical variation of the sand formation.Dongying delta in the middle Es3is divided from top to the bottom into 1-9different stages they are progressively deposited into the the center of the lake basin from east to west;there are three types of sandbodies.associated with delta front turbidites,they are：sliding turbidite,slump turbidite and distal turbidite.Among them the slump turbidite is the most stable one both in scale and in number,it is the important type for quantitative research of the front turbidites.The author used the method of control variables to explore the relationship between single factors,and then analyzes the relationship between multiple factors,and quantitatively researched the front turbidite of Dongying delta in the middle Es3to explore the quantitative relationship between the structure of deltaic sediments and the front slump turbidites.The study found that the structural characteristics of delta deposition（the thickness of the front delta strata H,sandstone percentage content x,etc.）,the distance of turbidite slip s and the size of slope angle of the front deltaα,can be quantitatively determined,and the thickness of the slump turbidite of front delta hand the thickness of the front delta strata H,the front sandstone percentage content x are positively correlated and it＇s negatively related with the distance of turbidite slip s,and has probed into and achieved the mathematical model for prediction of the thickness hof slump turbidite of the delta front.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2012年第1期146-155,共10页
Earth Science Frontiers
基金
胜利油田地质科学研究院合作项目"东营三角洲-浊积体系地质结构特征及预测模型研究"(2008-2010)
关键词
东营三角洲
滑塌浊积岩
数学模型
Dongying Delta slump turbidite rock mathematical model
