Population genetics. Population genetics is a subfield of genetics that deals with genetic differences within and between populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure.
In the fluid-filled case, the wellbore is presumed to be full of either all liquid or gas which gets compressed as afterflow continues into the wellbore. The wellbore storage constant (C) is a function of the wellbore volume (Vw) and the wellbore fluid compressibility (cwb) as shown below: For a fluid-filled wellbore:
It depends on the fluid and its viscosity. The number ranges from 500 - 600 for water but there is a wide range of numbers possible:. Water is a relatively viscous fluid (i.e. a thick and sticky fluid) compared to light spirits so three will be fewer drops of water in a fluid ounce than if the fluid was a spirit. Compare water with a thick heavy oil.