Define the following, and explain how are determined. $(5$ Marks$)$

a$.$ Pore pressure

b$.$ Fracture pressure

c$.$ Pressure gradient

d$.$ Mud gradient

e$.$ Safe mud window

Then support your answer with a plot that shows relation between the mentioned pressures.

$2.$ Based on gathered information shown in table $1\mathrm{.}1,$

a$.$ construct a plot of Pressure vs$.$ depth. $(2$ Marks$)$

b$.$ Calculate mud weight $($ppg$,$ SG$)$ and hydrostatic pressure for each depth. $(3$Marks$)$

Note: Here you can use Excel software.

Table $1.$ Pore pressure and fracture pressure gradients vs$.$ depth

$\backslash$table$[[$Depth $($ft$),$Pore pressure gradient $($psi$/$ft$),$Fracture gradient $($psi$/$ft$)],[1000,0\mathrm{.}449,0\mathrm{.}692],[2000,0\mathrm{.}449,0\mathrm{.}691],[3000,0\mathrm{.}449,0\mathrm{.}691],[4000,0\mathrm{.}449,0\mathrm{.}691],[5000,0\mathrm{.}449,0\mathrm{.}691],[6000,0\mathrm{.}449,0\mathrm{.}691],[7000,0\mathrm{.}591,0\mathrm{.}909],[8000,0\mathrm{.}669,1\mathrm{.}031],[8500,0\mathrm{.}702,1\mathrm{.}081],[8700,0\mathrm{.}702,1\mathrm{.}081],[9000,0\mathrm{.}731,1\mathrm{.}125],[9500,0\mathrm{.}751,1\mathrm{.}156],[10000,0\mathrm{.}769,1\mathrm{.}183],[11000,0\mathrm{.}790,1\mathrm{.}216],[12000,0\mathrm{.}784,1\mathrm{.}207]]$