恢复古水动力场定量研究油气运聚

摘要

为了更好地对油气二次运移进行定量研究，探讨重建古水动力场方法。以压实为机制，建立了适用于深埋环境的上下供水的层流动方程，提出边界确定方法，采用盆地模拟技术，利用有限单元法求各地质时期古水头的数值解，重现古水动力场演化。以此为基础，可编制盆地各地质历史时期反映油气运移的油、气、水势等值线图，以此直观判断油气运移方向。应用这一方法，对四川盆地阳新统进行了以46个节点为基础的实际模拟评价，获得各地质历史时期油气聚集分区图，为优选勘探区带提供依据。%This paper uses the method of restoring paleo-hydrodynamic field to carry out a simulation and evaluation of Yangxin series in Sichuan Basin based on 46 nodes.A distribution map of oil and gas accumulation is obtained for different geologic periods,which provides an important evidence for optimizing some exploration plays.An embedded flow equation of the water supply is established for the up and low parts of some environments with larger burial depth,which may help determining boundary.Practically,the technology of basin simulation and the Finite-element method are adopted to calculate numerical solutions of paleo-waterhead during different geological periods and to reconstruct the evolution of paleo-hydrodynamic field.Finally,a contour map of oil,gas,and water potentials in different geologic periods reflecting oil and gas migration may be worked out.This process becomes an intuitive method to judge the migration direction of oil and gas.This paper presents and discusses a method to restore the paleo-hydrodynamic field in order to better implement a quantitative study on secondary migration of oil and gas.