软沉积物滑塌变形物理模拟及变形机理分析

发布时间：2018-05-17 23:01

本文选题：软沉积物滑塌变形 + 重力驱动　；参考：《古地理学报》2017年01期

【摘要】：软沉积物滑塌变形是一种地质现象,对于分析区域地质发展史和指导油气勘探具有重要的意义,近年来越来越受到地学界的重视。但大多数的研究是基于野外现象的定性观察描述,对其形成过程和成因机制的定量探究较少。笔者建立了一套斜坡背景下重力驱动的软沉积物滑塌变形物理模拟实验装置,并设计了完整的实验程序,利用具有不同黏滞系数的材料模拟地层,通过多次实验改变沉积箱坡度模拟不同的地层倾角,总结了软沉积物滑塌变形的演化模式:滑塌开始,模拟地层逐渐隆起;随着地形坡度变大,滑塌褶皱依次发展成圆弧褶皱、紧密等斜褶皱,断裂产生后形成类似无根等斜褶皱和鞘褶皱的变形构造,直到地层趋于平稳。分析了软沉积物滑塌变形的机理:软沉积物受到自身沿斜坡重力的驱动,发生滑塌,层与层之间的剪切效应导致软沉积物发生变形。
[Abstract]:The collapse deformation of soft sediment is a kind of geological phenomenon, which is of great significance for the analysis of regional geological history and the guidance of oil and gas exploration. In recent years, more and more attention has been paid by the geosciences. However, most of the studies are based on the qualitative observation and description of field phenomena. In this paper, a set of gravity driven physical simulation device of soft sediment sloughing deformation under the background of slope is established, and a complete experimental program is designed to simulate the formation with different viscous coefficient materials. By changing the slope of sedimentary box to simulate different dip angles, the evolution model of slide deformation of soft sediment is summarized: the landslide begins, the simulated strata gradually uplift, and the slide fold develops into circular arc fold with the increase of topographic slope. After the occurrence of the faults, the deformed structures are similar to the rootless isoclinal folds and sheath folds, until the strata become stable. The mechanism of collapse deformation of soft sediment is analyzed: soft sediment is driven by its own gravity along the slope and collapses occur, and the shear effect between layers leads to deformation of soft sediment.
【作者单位】：中国地质大学(北京)海洋学院;长江大学地球科学学院;成都理工大学能源学院;成都理工大学油气藏地质及开发工程国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(编号:41402098)资助~~
【分类号】：P618.13;P542

【参考文献】