pet system - migration & reservoir

The process of the movement of petroleum from its source rock to its reservoir, until its expulsion unto the Earth’s surface and is not exactly defined how the process occurs.

Migration

Expulsion of petroleum from the source rocks into the permeable carrier beds.

Primary migration

Migration from carrier beds into the reservoir and traps.

Secondary migration

Migration through the leakage and extraction of petroleum unto the Earth’s surface.

Tertiary migration

A rock mass with enough porosity and permeability that has accumulated an economically viable amount of petroleum.

Reservoir

A void space in the rock that’s measured by percent volume.

Porosity

The art of flow of fluids which controls the directional movement of the reservoir fluids.

Permeability

Porosity formed during sediment deposition.

Primary porosity

Pores that developed after deposition.

Secondary porosity

100% saturated rocks with a single fluid phase.

Absolute permeability

The permeability to a particular fluid when the rock’s pore spaces contain more than one fluid.

Effective permeability

The total vertical interval from the top of the reservoir down to the petroleum water boundary.

Gross pay

The portion of the reservoir that can produce economically viable amounts of petroleum with a specific production method.

Net pay

The portion of the reservoir that cannot produce economic amounts of petroleum.

Non pay

The percentage of the potential production of a reservoir.

Net to gross