Reservoir Engineering: Rock Properties

Porosity is defined as the ratio of void space, or ______ volume, to the total bulk volume of the rock.

Hydrocarbon porosity is part of the porosity that contains ______.

Absolute porosity is the ratio of the total ______ space in the rock to that of the bulk volume.

Effective porosity is the percentage of ______ pore space with respect to the bulk volume.

Saturation is the fraction, or percent, of the ______ volume occupied by a particular fluid.

______ porosity ranges from 10% to 40% for sandstone type reservoirs.

Two distinct types of porosity are ______ porosity and effective porosity.

The ______ of a fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids is called wettability.

Changing the type of ______ or fluid can change IFT and hence the wettability of the system.

Adding a chemical such as ______ can alter wettability.

The wettability of a rock-fluid system depends on ______.

The total volume of the fluid is the sum of the volume of ______, oil, and water.

The equation Sg + So + Sw = 1.0 represents the total ______ of the fluid.

Wettability is measured by ______ angle, which is always measured through the denser phase and is related to interfacial energies.

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

Capillary pressure is equal to the pressure of ______ wetting phase minus the pressure of non-wetting phase.

There are three types of capillary pressure: water-oil capillary pressure, gas-oil capillary pressure, and gas-______ capillary pressure.

Permeability is a property of the porous medium that measures the capacity and ability of the formation to transmit ______.

The ______ between oil and solid is represented by the symbol σos.

The ______ is the angle at the oil-water-solid interface measured through the water phase.

The interfacial energy between oil and water is represented by the symbol ______.

Absolute permeability is the ability of a rock to transmit a single fluid when it is 100% saturated with that ______.

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

Relative permeability is the ratio between effective permeability of a ______ at partial saturation, and the permeability at 100% saturation.

Rock-matrix compressibility is the fractional change in volume of the solid ______ material with a unit change in pressure.

Rock-bulk compressibility is the fractional change in volume of the ______ volume of the rock with a unit change in pressure.

Pore compressibility is the fractional change in volume of the ______ space with a unit change in pressure.

Rock-matrix compressibility is denoted by the symbol ______.

Rock-bulk compressibility is denoted by the symbol ______.