辽河盆地二界沟洼陷沙三段层序地层划分及沉积相研究
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摘要
本文采用C ross高分辨率层序地层学、测井地质学、沉积学、石油地质学等学科对辽河盆地东部凹陷二界沟洼陷进行层序的划分和沉积相研究。同时结合洼陷的构造地质特征,在层序地层格架内进行沉积体系研究,分析了洼陷内的沉积相带的平面分布规律和纵向演化特点。通过岩心、测井、地震的响应特征分别对短、中、长期旋回进行识别,将目的层沙三段划分为3个三级层序。研究区内发育4种沉积相类型:辫状河三角洲、扇三角洲、近岸水下扇及湖泊相。其中,近岸水下扇,主要发育沿工区东侧荣兴屯背斜带的东缘断崖附近,多呈点状分布;扇三角洲主要发育在工区两侧潜山带附近,多呈裙带状分布;辫状河三角洲主要发育在工区的北侧、东侧,呈连片状分布。滨浅湖、半深湖主要发育于二界沟洼陷中央深陷带。
The paper focus on the study of sequence stratigraphic subdivision and depositional facies to the Er Jie Gou sag in East depression of Liao Her basin with the help of following subjects such as: High Resolution Sequence Stratigraphy,Seismic Stratigraphy,Geophysical Logging Sedimentary,Petroleum Geology.Meanwhile,combining with the characteristic of geologic structure,the research on the depositional system is made in the sequence stratigraphic framework analyzing the plane distribution rule of depositional facies in depression.Through the corresponding feature of cores,logging and seismic,the long-term,middle-term and short-term cycles can be distinguished so as to divide the aimed stratum into three ranks.They are four sedimentary facies types in research area as follows: braided channel delta,fan-deltaic,offshore under-water channel and lake facies,of which the near bank and under-water channel mainly developed in anticline zone distributed in spot shape,fan-deltaic mainly developed in buried hill on the both sides of aimed zone distributed in skirt shape,braided channel delta mainly developed in the north and east of the aimed zone distributed in slice shape,shallow lake and deep lake mainly developed in the center of the Er Jiegou sag
引文
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