Essential use of multi-component p – T diagram:

Question 1

The ratio of pore space volume, to the bulk volume of the rock

Answer 1

Porosity

Question 2

Porosity = pore space volume / Bulk Volume

Answer 2

Porosity

Question 3

Is a part of Porosity that contain Hydrocarbon

Answer 3

Hydrocarbon Porosity

Question 4

Two distinct types of Porosity

Answer 4

Absolute Porosity
Effective Porosity

Question 5

the ration of the total pore space in the rock to the bulk volume

Answer 5

Absolute Porosity

Question 6

Porosity = Total pore space / bulk volume

Porosity = total pore space - grain volume / bulk volume

Answer 6

Absolute Porosity

Question 7

Percentage of the interconnected pore space with respect to the bulk volume

Answer 7

Effective Porosity

Question 8

Porosity = interconnected pore space / bulk volume

Answer 8

Effective Porosity

Question 9

Use in determining the original hydrocarbon volume in place

Answer 9

Important application

Question 10

Fraction, or percent, of the pore volume occupied by a particular fluid (oil, gas, or wate)

Answer 10

Saturation

Question 11

fluid saturation = total volume of the fluid/ pore volume

So = Volume of oil / pore volume

Sg = volume of gas/pore volume

Sw = volume of water/pore volume

Sg + So + Sw = 1.0

Answer 11

Saturation

Question 12

The tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids

Answer 12

Wettability

Question 13

Capillary Pressure = pressure of non-wetting phase - pressure of wetting phase

Answer 13

Capillary Pressure

Question 14

The pressure difference across the curved interface formed by two immiscible fluids in a small capillary tube.

Answer 14

Capillary Pressure

Question 15

Three types of Capillary Pressure

Answer 15

Water-oil capillary, Pcwo
Gas-Oil capillary, Pcgo
Gas-water capillary, Pcgw

Question 16

A property of the porous medium that pressure the capacity and ability of the formation to transmit fluids

Answer 16

Permeability, K

Question 17

The ability of a rock to transmit a single fluid when it is 100% saturated with that fluid

Answer 17

Absolute Permeability

Question 18

Refers to the presence of two fluids in a rock, and is the ability of the rock to transmit fluid in the presence of another fluid when the two fluids are immiscible.

Answer 18

Effective Permeability

Question 19

The ratio between the effective permeability of fluid at partial saturation, and the permeability at 100% saturation (absolute permeability)

Answer 19

Relative Permeability

Question 20

Geertsma (1957) points out that there are three different types of compressibility that must be distinguished in rocks

Answer 20

Rock Compressibility

Question 21

The fractional change in volume of the solid rock material (grains) with a unit change in pressure

Answer 21

Rock-matrix Compressibility, Cr

Question 22

The fractional change in volume of the bulk volume of the rock with a unit change in pressure.

Answer 22

Rock-bulk compressibility, Cb

Question 23

The fractional change in pore volume of the rock with a unit change in pressure

Answer 23

Pore Compressibility, Cp