分期异向分层伸展断裂系统叠加过程模拟研究—以渤海湾盆地南堡凹陷为例

项目名称： 分期异向分层伸展断裂系统叠加过程模拟研究—以渤海湾盆地南堡凹陷为例

项目编号： No.41472116

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 于福生

作者单位： 中国石油大学（北京）

项目金额： 100万元

中文摘要： 分期异向伸展叠加构造是裂陷盆地演化过程中因应力场改变而导致的叠加变形现象；两期伸展断裂系统之间是否存在韧性滑脱层(泥岩层和膏岩层)是分层叠加变形的主控物质因素；构造物理模拟和离散元数值模拟技术是再现伸展断裂系统叠加过程的有效手段。渤海湾盆地南堡凹陷古近纪沙河街期断裂和东营期断裂组成典型的分期异向分层伸展叠加断裂系统。本项目拟通过多组分期异向伸展基础实验模拟研究，建立有无滑脱层分期伸展叠加断裂系统演化的定量化模型。通过对渤海湾盆地南堡凹陷三维地震资料精细解释，建立古近纪沙河街期、东营期伸展断裂几何学和运动学模型，应用基础模拟实验结果和南堡凹陷构造背景及边界条件开展物理模拟和数值模拟研究，建立南堡凹陷伸展叠加断裂系统三维动力学模型，分析不同期次断裂演化过程对生、储、盖组合的控制规律。进而分析渤海湾盆地成因机制，为深入探讨太平洋板块、印度板块向欧亚板块俯冲、碰撞产生的区域应力场效应提供依据。

中文关键词： 物理模拟；离散元模拟；伸展断裂系统；南堡凹陷；渤海湾盆地

英文摘要： Superimposed structure of multiphase extension from different orientation is the dominant deformation styles occure during the evolution of extensional basins resulting from stress changes.Ductile layers (mudstone and salt)between brittle layers is the main rock property factors to generate superimposed fault systems.Analogue modeling and descrete element method are effective techniques to simulate extensional faults in rift basins.Fault systems localising in Dongying Formation superimpsoed above fault systems developed in the Eocene Shahejie Formation in Nanpu sag of Bohai Bay Basin.On the base of fundamental simulation results,quantitative models of superimposed fault systems with or without decollements between two brittle layers will be built by the research.According to detailed interpretation of 3D seismic data of Nanpu sag,geometric and kinametic models for the Eocene Shahejie formation and Dongying formation will be established.Physical and numerical simulation will be carried out according to tectonic setting and basic modeling results in order to build visial dynamic models for Nanpu sag.Distribution charateristics of hydrocabon ,reservoir and caprock controlled by multiphase fault systems will be concluded,and then to analyse the genetic evolution of Bohai Bay basin in order to give the evidence to discuss the effect of stress field caused by subduction and collision of Pacific plate and Indian plate to Eurasia Plate.

英文关键词： Analogue simulation;Descrete element method simulation;Extensional fault systems;Nanpu sag;Bohai Bay Basin