Approximate formula for the volume of oil-storing space of a reservoir (Q1196479)

In the prospecting and exploiting of oil, to estimate the reserves and boundaries of a reservoir has a great significance. Therefore, we propose approximate formulas to estimate the volume of oil-storing space of a reservoir. In regard to the complexity of oil storage in an underground penetration flow, we have to make a simple assumption so that we can establish an appropriate mathematical model. We assume that the reservoir system is homogeneous and isotropic and it has a constant thickness, the fluid flowing into the wellbore is slightly compressible, and the stratigraphic parameters are known.