Numerical Modeling Method Considering Fault Conductivity

Abstract

Fault can serve as an important channel for hydrocarbon migration and fluid migration, and takes part in sealing oil and gas accumulation. Fault opening has serious pollution to groundwater environment. In most cases, the transition state between fault being completely closed or completely opened, but there is a difference in the sealing ability of its. In reservoir simulation, traditional fault spatial description tool, which leads us to analyze the closure and stability of the faults only as a two-dimensional plane. Then in order to more accurately predict the fluid migration and the stability of fault zones and realize the fault 3D quantitative simulation, we need to new method of fault description to describe and characterize the fault structure more accurately and deformation quantitatively. Based on the traditional modeling technology, we will explicitly consider the method of quantitative evaluation of fault sealing ability in the internal structure of faults. The method can show 3D feature of the fracture zone and the fault will be considered as a deformed rock mass rather than a surface like the anisotropy of permeability and the curvature of fluid channel are clearly represent in the reservoir model. On the scale of simulated grids, the flow and uncertainty between grids on both sides of the fault zone are prior rather than using historical fitting posteriori. And the modeling technology can clearly characterize fault sealing ability and contribute to correctly understand ad predict oil and gas migration, focus, loss process and oil and gas distribution rule.