What do you understand by reservoir rock?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Reservoir Rock**: Reservoir rocks are geological formations that have the capacity to store fluids, such as water, oil, and gas, within their pore spaces.

2. **Storage Capacity**: The key characteristic of reservoir rocks is their ability to accumulate these fluids. This is due to their porous nature, which allows them to hold significant amounts of liquids and gases.

3. **Role in Petroleum Geology**: In the context of petroleum geology, reservoir rocks are crucial components of the petroleum system. They serve as the locations where hydrocarbons (oil and gas) can accumulate.

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