1. Porosity: This refers to the volume of open spaces within the rock that can hold fluids (like oil, gas, or water).

* Higher porosity means more space for fluids, making it a better reservoir.

* Types of porosity:

* Interconnected: Open spaces are connected, allowing fluids to flow through.

* Isolated: Open spaces are not connected, so fluids cannot flow.

2. Permeability: This describes the ability of the rock to allow fluids to flow through it.

* Higher permeability means fluids can flow more easily, which is important for extracting resources.

* Factors affecting permeability:

* Size and shape of pores

* Interconnectivity of pores

It's important to note that both porosity and permeability are crucial for a rock to be considered a good reservoir.