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Conditions for the definite solution of hydrodynamic equations
According to the basin model, carrier layer and hydrodynamic model, the definite solution conditions of equation (6-8) can be given.

(1) initial conditions

The initial value of constant water head h0, that is, the ancient water head value of the carrier layer after the deposition of the third member of Shahejie Formation:

Secondary migration and accumulation of oil and gas in fault basin

Where Lx and Ly are the grid boundaries of the simulated (seepage) region (see Figure 6-6).

(2) Boundary conditions

According to the analysis in Chapter 3-5, it can be seen that the groundwater flow in the compacted flow basin is mainly centrifugal flow, which is well sealed, so the recharge of the infiltration water at the edge of the basin (such as the bulge) can be ignored, and its boundary is the water-blocking boundary. When t > 0

Secondary migration and accumulation of oil and gas in fault basin

Where n is the outer normal direction of the boundary.

See Chapter 7 for the source, determination method and principle of each parameter.