General Subsurface Flashcards
What is a subsurface reservoir?
A subsurface reservoir is a porous rock formation underground that stores fluids like oil, gas, or water.
What is a hydrocarbon trap?
A hydrocarbon trap is a geological structure that keeps oil and gas from moving upwards, trapping them in the subsurface. Types include structural traps (formed by folding or faulting) and stratigraphic traps (formed by changes in rock type).
What fluids are found in reservoirs?
Reservoirs usually contain oil, natural gas, and water, each of which is present in different proportions depending on the reservoir type.
What are porosity and permeability?
Porosity is the measure of empty space in a rock that can hold fluids, while permeability is how easily fluids can flow through the rock’s pores.
What is reservoir pressure?
It’s the natural pressure within a reservoir that pushes fluids to the surface. Over time, as fluids are produced, this pressure declines.
What is capillary pressure?
It’s the pressure that helps fluids move through tiny spaces in the rock, affecting how oil, gas, and water are distributed.
What is a reservoir in subsurface engineering?
It’s an underground formation where oil or gas is stored in porous rock.
What is permeability?
It’s how easily fluids like oil or gas can flow through rock pores.
What is capillary pressure in a reservoir?
Capillary pressure is the pressure difference between two fluids in a small space within a rock, which helps determine how oil, water, and gas are distributed in a reservoir.
