What are petroleum reservoirs? Name any two petroleum reservoirs found in India.

Explanation

**Step-by-Step Solution:**

1. **Definition of Petroleum Reservoirs:**
- Petroleum reservoirs are natural formations in the Earth that contain accumulations of hydrocarbons, primarily oil and gas. These reservoirs are typically composed of permeable and porous rock formations that allow for the storage and movement of these natural resources.

2. **Characteristics of Petroleum Reservoirs:**
- The key characteristics of petroleum reservoirs include:
- **Porosity:** This refers to the amount of empty space within the rock that can hold oil and gas.
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