Final answer:
Depleted oil reservoirs are used for oil and natural gas storage by utilizing their empty cavities. The remaining space in the reservoirs can be filled with oil or natural gas, providing a cost-effective solution for storage.
Step-by-step explanation:
Depleted oil reservoirs can be used for oil and natural gas storage due to their geological characteristics. These reservoirs have already produced a significant amount of oil and gas, which has resulted in a decrease in their pressure. To utilize these reservoirs for storage, the remaining space can be filled with oil or natural gas, effectively utilizing the empty cavities.
For example, depleted oil reservoirs can be utilized for storing natural gas by compressing the gas into liquid form and injecting it into the reservoir. The natural gas is then stored in the reservoir under high pressure and low temperature conditions.
This method is beneficial as it provides an efficient and cost-effective solution for storing oil and gas, utilizing existing infrastructure and reducing the need for constructing new storage facilities.