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Calgary, AB · 2026-09-24

Buying or Selling Oil and Gas Assets in Alberta: How the Deal Fits Together

Oil & Gas Deals: illustrated cover for a LawDB guide about Calgary, Alberta
Blakes describes its Calgary office as home to one of the largest energy law practices in Alberta and says its Oil & Gas group is headquartered there. This guide is our own general overview.

Oil and gas assets in Alberta are not like buying a building. Rights come from Crown leases or freehold titles, wells and facilities carry regulatory licences, and the buyer inherits obligations as well as production. That is why these deals lean heavily on due diligence.

The core documents

Most asset sales run on a purchase and sale agreement that sets the price, the effective date and what is being transferred, with schedules listing leases, wells, facilities and contracts. Buyers and sellers negotiate representations and warranties, conditions to closing and how price adjustments are calculated between the effective date and closing.

Where the assets are held in a company, the deal may instead be a share purchase, which brings different tax and liability consequences.

Due diligence buyers focus on

Title and lease status, the terms of surface and mineral rights, third-party contracts such as processing and gathering agreements, and joint venture or operating agreements. Environmental and abandonment and reclamation liabilities are a central concern in Alberta.

Licensed wells, pipelines and facilities cannot simply change hands. Transfers of regulatory licences generally need the approval of the Alberta Energy Regulator, and the buyer’s ability to meet its liability obligations is part of that review.

Timing and approvals

Closing conditions often include regulatory approvals, consents from counterparties and, in larger deals, competition or foreign-investment clearances. Building in enough time for these is one of the most common practical lessons for first-time buyers of Alberta assets.

Negotiate what happens if an approval is delayed: outside dates, price adjustments and who bears the carrying costs.

Before you sign a letter of intent

Firm spotlight: Blake, Cassels & Graydon LLP

Blake, Cassels & Graydon, known as Blakes, has served Alberta’s business community from Calgary for more than four decades. The firm says the office acts on some of Canada’s largest and most complex transactions, major cross-border deals and “bet-the-company” disputes. See the full Blake, Cassels & Graydon LLP profile. Read more from the Blakes Calgary office page.

Frequently asked questions

Who approves the transfer of oil and gas licences in Alberta?

Licence transfers generally need Alberta Energy Regulator approval, and the buyer’s liability position is part of the review.

What is an effective date?

It is the date from which the buyer takes the economic benefit and burden of the assets, with adjustments made at closing.

Why is reclamation such a big issue?

Wells, pipelines and facilities carry end-of-life abandonment and reclamation obligations, and a buyer takes those on with the assets.

Is a share purchase different from an asset purchase?

Yes. In a share deal the buyer acquires the company with its history and liabilities, while an asset deal transfers specific assets and obligations.

When should a lawyer be involved?

Before signing a letter of intent or term sheet, since early terms often shape the rest of the deal.

Alberta firms to look at

Blake, Cassels & Graydon LLP★ 3.9 (8)Hoare Claxton Criminal Defence★ 5.0 (27)Cuming & Gillespie LLP★ 4.7 (80)McCarthy Tétrault LLP★ 4.6 (12)

See all Calgary law firms · All Alberta law firms

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General information for readers in Alberta, not legal advice for any specific situation. Laws, thresholds and deadlines change, so confirm current rules with a lawyer before relying on anything above. LawDB is an independent directory and is not affiliated with Blake, Cassels & Graydon LLP; firm details come from the firm’s own published descriptions and public listings.