Organic reserve replacement is an important metric used by energy companies when evaluating their oil and gas reserves. It is a measure of how much new oil and gas supply a company has installed in its portfolio, regardless of whether it is acquired through exploration, development or acquisition. Organic reserve replacement is an indicator of a company's capacity to drill for new reserves and replace declining assets.

Organic reserve replacement is calculated using the following formula:

Replacement = [Exploration + Development + Acquisitions] - (Depletion + Disposals + Revisions)

The first part of the equation represents the addition of new reserves, while the second part subtracts the depletion of existing reserves.

Organic reserve replacement is an indicator of a company's performance in maintaining their reserves and compensating for natural reservoir decline in the field they operate in. It is an important metric in evaluating a company's ability to produce sufficient oil and gas supplies to meet its production goals.

Organic reserve replacement is affected by a company's exploration success, production capabilities, and the opportunities it has for acquisitions. Companies that invest in exploration, research and development, and acquisition of new reserves can be expected to perform better in terms of organic reserve replacement than those that only drill for natural resources. Furthermore, companies that invest in modern technology and infrastructure can achieve higher organic reserve replacement.

Organic reserve replacement provides an important insight into a company's future ability to maintain production and replace its reserves. Companies with high organic reserve replacement are perceived to be more reliable and produce higher financial returns for investors. Therefore, oil and gas investors should rely on organic reserve replacement rates when assessing a company’s performance.