二维沉积层序计算机模拟研究

本项研究建立了综合性的二维沉积层序模拟系统SSMS。该模拟系统由盆地的沉降过程模拟与盆地充填过程模拟两个子系统构成。盆地的沉降模拟结合了反演的沉降回剥和盆地形成的正演模型；盆地充填过程模拟综合考虑了盆地沉降、重力均衡作用、海（湖）平面升降、沉积物供给、侵蚀作用、沉积物分布和压实等因素。结合实例分析表明，该模拟系统可用于定量分析盆地构造、海（湖）平面、沉积物供给等变化对沉积层序的形成过程、几何形态及其沉积体系分布的控制作用，检验地质模型和进行预测。

Tow Dimensional Depositional Sequence Simulation

A quantitative tow dimensional depositional sequence model has been formulated to simulate the filling process of sedimentary basins.The system consists of two subsystems:basin subsidence modelling and basin filling simulation,taking into account sea level change,tectonic subsidence,compaction of sediments,flexural isostatic compensation,erosion and sedimentation.Input basin subsidence rate can be derived by backstripping technique,or be calculated by quantitative forward basin models.Geometric models,combined with diffusion models,have been used in the system to determine depositional surfaces and facies geometry.The system can be used to analysis the controlling processes of sedimentary basins and to predict sequence architecture and facies distribution within basins.The model has been alogrumthed to simulate the sedimentary filling of continental margin basins and shown that the tectonic subsidence rate variation and the amplitude of sea level change have a strong influence on the geometry and depositional style of basin fills.