An oil reservoir is a natural underground formation that contains oil and gas. These reservoirs are typically found in porous rock layers, where oil accumulates over millions of years. The oil is trapped beneath impermeable rock layers, preventing it from escaping to the surface. To extract oil from a reservoir, companies use drilling techniques to reach the oil deposits. Once accessed, the oil can be pumped to the surface for processing and distribution. Understanding the characteristics of an oil reservoir is crucial for efficient extraction and management of this valuable resource.