One of the primary challenges for industry participants when valuing and pricing oil and gas reserves is addressing proven undeveloped reserves (PUDs) and unproven reserves. While the market approach can sometimes be used to understand the value of PUDs and unproven reserves, every transaction is unique. Additionally, many transactions that we see today are still a result of the crash in oil prices in 2014; and in some sales of non-core assets, PUDs and unproven reserves have been deemed worthless. Why then, and under what circumstances, might the PUDs and unproven reserves have significant value?