Petroleum Terms Explained - 2

Fracture
When a rock is subjected to external forces or internal stresses, it is called a crack that loses its bond strength and causes cracks but no displacement.
Reservoir reservoir
Rocks that can store and permeate fluids are called reservoirs.
Cover caprock
Located above the reservoir, the reservoir can be sealed off, so that the oil and gas in it can be avoided by the rock capping layer that escapes upwards.
Sealing layer seal rock
The rock layer on the side of the reservoir that can block oil and gas lateral migration and escape is called the sealing layer.
Storage space
The space in the reservoir that can store fluids is called the reservoir space. It is generally divided into three categories: pores, caverns and cracks.
Primary pores
The reservoir space in the reservoir rock formation is formed during the time when the rock is formed. For example, the pores between the sandstone particles are formed when the sandstone is deposited, and are called primary pores.
Secondary pores secondary pore
The reservoir space in the reservoir rock formation is formed after rock diagenesis, such as cracks, dissolved pores, and holes.
Reservoir properties petrophysical property
Mainly refers to the porosity and permeability of reservoir rock. These two properties determine the oil and gas production capacity of the reservoir.
Total porosity
The ratio of the volume of all pore space in a rock sample to the total volume of the rock sample. The total or absolute porosity of the sample is reported as a percentage.
Effective porosity
The ratio of the pore volume to the total volume of the rock in the rock samples that are interconnected and under certain pressure conditions where the fluid can flow is expressed as a percentage.