Audit Committee Questions on Oil & Gas Reserves

TL;DR

• Ask who prepared the reserve case, what was reviewed, and what was outside scope.
• Focus on PUD conversion, technical revisions, price and cost sensitivity, and internal-control evidence.
• Confirm the reserve report, 10-K disclosure, MD&A, impairment analysis, and capital plan tell the same story.
• Require management to explain sustained trends, not just year-end numbers.

Why reserves belong on the audit committee agenda

Oil and gas reserves are among the most judgment-heavy estimates in upstream financial reporting. SEC Rule 4-10 defines proved reserves using geoscience and engineering data, reasonable certainty, existing economic conditions, operating methods, and regulations (17 CFR 210.4-10). Those estimates feed depletion, impairment, standardized measure, reserve disclosures, and investor messaging.

PCAOB AS 1301 requires auditors to communicate with audit committees about significant risks, critical accounting estimates, management assumptions, qualitative aspects of accounting practices, and significant difficulties encountered during the audit (PCAOB AS 1301). For oil and gas issuers, reserves often sit squarely in that zone.

Questions about scope and independence

Start with scope. What properties were covered by the third-party evaluator, by value and by volume? Were nonoperated assets reviewed differently from operated assets? Were minor properties rolled forward internally? Were acquisitions, divestitures, shut-in wells, and inactive wells included?

Then ask independence and tenure questions. Who selected the evaluator? What non-reserve services did the evaluator provide? How long has the same firm or lead technical team been involved? What changed in scope or methodology from the prior year? SEC Item 1202 requires specific third-party report disclosures when a third party prepares or audits reserves, including purpose, scope, assumptions, methods, limitations, and conclusions (17 CFR Part 229 Subpart 1200).

Questions about assumptions

The committee should ask management to walk through the assumptions that changed value most: price basis, differentials, LOE, capital costs, abandonment costs, timing, decline curves, well spacing, type curves, and operating constraints. SEC pricing for proved reserves uses the 12-month average of first-day-of-month prices unless contractual pricing applies (17 CFR 210.4-10). That price basis may differ from budget, impairment, bank, or acquisition cases.

Good governance requires clear bridges. If the capital plan assumes a different price deck, if impairment testing uses different assumptions, or if lender cases use more conservative curves, the committee should understand why.

Questions about PUDs

PUDs are the committee’s execution checkpoint. Ask what percentage of total proved reserves and standardized measure comes from PUDs. Ask how many PUDs were converted to developed reserves, how much capital was spent, and how actual wells performed versus booking assumptions.

SEC rules generally require PUD locations to be scheduled for drilling within five years under an adopted development plan unless specific circumstances justify a longer period (17 CFR 210.4-10). Item 1203 requires disclosure of PUD changes, conversion progress, investments, and reasons material PUDs remain undeveloped for five years or more (17 CFR Part 229 Subpart 1200).

Questions about revisions and red flags

Ask for a three- to five-year reserve bridge by category. Separate price revisions, technical revisions, extensions, discoveries, purchases, sales, and production. Repeated negative technical revisions can indicate type-curve optimism, spacing degradation, cost pressure, mechanical issues, or weak controls. Repeated large positive revisions can also deserve scrutiny if they are unsupported by new data or consistent development success.

Ask which wells, fields, or benches drove the revisions. Ask whether management compensation metrics create pressure around reserve replacement, production growth, or proved inventory. AS 1301 requires auditors to communicate potential management bias in significant accounting estimates when relevant to financial reporting (PCAOB AS 1301).

Questions about controls and disclosure alignment

The committee should ask how reserve data moves from field systems to the reserve database, financial statements, and 10-K. Who approves ownership, production, LOE, capital, and price inputs? What controls exist over manual changes? What reconciliations are performed between the reserve report, production accounting, land records, and general ledger?

Then test alignment. Do MD&A, risk factors, impairment disclosures, standardized measure, PUD disclosures, and investor presentations tell a consistent story? SEC Subpart 1200 requires oil and gas disclosures to be included when oil and gas producing activities are material (17 CFR Part 229 Subpart 1200).

When this comes up

Audit committees confront reserve questions at year-end reserve review, auditor planning, impairment assessment, annual report approval, acquisition review, debt refinancing, covenant stress, and restatement or comment-letter response. Reserve-audit liaisons and internal audit teams encounter the same issues when documenting controls over engineering inputs and disclosures.

The committee’s role is not to become the reservoir engineer. It is to require a disciplined explanation of assumptions, changes, evidence, uncertainty, and disclosure consequences.

Common misreadings

The first misreading is treating third-party involvement as full assurance. A reserves audit or evaluation has a defined scope and limitations; the committee must understand what was reviewed and what was not.

The second is focusing only on total proved reserves. Mix matters. PDP-heavy reserves and PUD-heavy reserves carry different execution risk.

The third is treating reserve review as annual paperwork. The reserve case should be linked to capital allocation, operational performance, internal controls, and external disclosure throughout the cycle.

Bottom line

A good audit committee reserve discussion ends with clear answers: what changed, why it changed, what evidence supports it, what assumptions matter most, what could be wrong, and whether the financial statements and disclosures reflect that uncertainty.