Brookside Energy Reserve Growth Delivers 12.52 MMBOE Certification

Brookside Energy Delivers Solid Reserve Growth with 12.52 MMBOE Certification

Brookside Energy Limited (ASX: BRK) has released its year-end 2025 reserves certification, demonstrating continued progress in developing its SWISH play position in Oklahoma's prolific Anadarko Basin. The independently assessed reserves report shows 12.52 MMBOE of Total Proved plus Probable (2P) Net Reserves, with meaningful growth across key producing categories that reflects the quality execution of Brookside's drilling programme.

The results showcase a company successfully converting drilling results into certified reserves whilst maintaining production discipline. With 2.80 MMBOE of Proved Developed Producing reserves and reserves replacement ratios exceeding 100% across all categories, Brookside Energy reserve growth demonstrates the operational consistency that builds long-term value for shareholders.

Key Reserve Metrics Show Steady Growth Trajectory

The reserve certification by Haas & Cobb reveals encouraging trends across Brookside Energy reserve growth metrics. The company has achieved consistent expansion across all key reserve categories, indicating robust operational performance.

The reserve replacement performance tells a compelling story of operational effectiveness. Furthermore, these ratios demonstrate the company's ability to sustain long-term production.

The replacement ratios include:

• 121.7% of FY2025 production replaced on a PDP basis
• 152.6% replacement ratio for Total Proved (1P) reserves
• 126.2% replacement for Total Proved + Probable (2P) reserves

These replacement ratios exceeding 100% across all categories indicate Brookside is successfully converting its drilling activity into certified reserves faster than it's depleting existing reserves through production.

Understanding Reserve Categories: Why PDP Growth Matters

For investors new to oil and gas reserve classifications, Proved Developed Producing (PDP) reserves represent the gold standard. These are reserves from wells currently producing that have demonstrated performance. Think of PDP reserves as the "cash in the bank" of the oil and gas world.

The 5% growth in PDP reserves is particularly significant because these reserves generate immediate cash flow. Moreover, they carry the lowest risk profile of all reserve categories. Growth demonstrates successful well performance exceeding initial estimates.

Total Proved (1P) reserves include PDP plus proved undeveloped locations, whilst 2P reserves add probable undeveloped potential. The steady growth across all categories shows Brookside Energy reserve growth is building a robust reserve base from current producers through to future development opportunities.

Reserve Category Breakdown

Proved Developed Producing (PDP): Wells currently producing that have demonstrated their ability to deliver hydrocarbons. These reserves offer the highest certainty and immediate cash generation.

Proved Undeveloped (PUD): Reserves that require additional capital expenditure (drilling, completion, facilities) but are supported by proven geology and approved development plans. However, they represent lower-risk development opportunities.

Probable Undeveloped: Reserves with lower certainty than proved categories but still economically viable based on geological and engineering analysis. These provide future growth potential for the company's expansion plans.

SWISH Play Position Delivering Consistent Results

Brookside's reserves are concentrated in the Sycamore and Woodford formations within the SWISH play, where the company has established itself as a focused operator. The reserve growth stems from consistent operational excellence and strategic positioning.

Operational Performance:
• Performance of Brookside's operated horizontal wells
• Conversion of drilling results into booked reserves
• Wells performing as expected, supporting development outlook

Strategic Position:
• Substantial inventory of future development locations
• Long runway to convert development locations into producing reserves
• Concentrated acreage position in proven hydrocarbon province

"Our 2025 reserves report shows steady progress in the development of our SWISH acreage position. Our operated wells continue to perform as expected and that performance is now translating into higher proved reserves," said David Prentice, Managing Director & CEO.

"We increased our producing reserves whilst growing our overall reserve base modestly to 12.52 MMBOE. That outcome reflects both the quality of the rock and the disciplined way we are developing it."

Detailed Reserve Breakdown Reveals Asset Quality

The FY2025 reserve composition demonstrates a balanced mix across development stages. This diversification provides stability whilst maintaining growth potential across multiple development phases.

The reserve mix shows 22% oil, 31% NGLs, and 47% natural gas (on a BOE basis). This provides diversified commodity exposure whilst benefiting from premium NGL pricing relative to dry gas.

PDP Reserve Reconciliation Analysis

The Proved Developed Producing reconciliation reveals the mechanics behind Brookside Energy reserve growth. In addition, this analysis demonstrates the effectiveness of the company's drilling and completion strategies.

The 805,936 BOE in additions and adjustments more than offset annual production of 661,964 BOE. Consequently, this delivered net PDP growth of approximately 144,000 BOE year-on-year.

SWISH Play: Understanding Brookside's Strategic Position

The SWISH play (Sycamore, Woodford, Hunton formations) represents a multi-layered hydrocarbon system within Oklahoma's Anadarko Basin. This geological setting offers several advantages for operators like Brookside.

Formation Characteristics:
• Sycamore Formation: Limestone and shale sequence known for oil and NGL production
• Woodford Formation: Organic-rich shale formation with proven hydrocarbon generation
• Multi-zone Potential: Ability to target multiple productive intervals from single well locations

Basin Advantages:
• Established infrastructure reduces development costs
• Proven hydrocarbon system with decades of production history
• Favourable regulatory environment for oil and gas operations
• Access to multiple takeaway capacity options for production

Operational Benefits:
• Predictable drilling and completion techniques
• Known reservoir characteristics reduce technical risk
• Established service provider network
• Existing pipeline and processing infrastructure

Investment Thesis: Quality Execution in Proven Basin

The reserve certification reinforces several key investment themes supporting Brookside Energy reserve growth. Furthermore, these metrics demonstrate the company's strategic approach to asset development.

Operational Excellence: The company consistently converts drilling activity into certified reserves whilst maintaining production discipline. Reserve replacement ratios above 120% across all categories demonstrate effective capital allocation.

Asset Quality: The SWISH play location in Oklahoma's Anadarko Basin provides access to multiple productive formations (Sycamore and Woodford). In addition, it offers established infrastructure and favourable operating conditions.

Growth Runway: With substantial future development locations across its acreage position, Brookside maintains a long-term inventory of drilling opportunities. This positions the company to sustain reserve and production growth over multiple years.

Financial Discipline: The modest 1% growth in 2P reserves whilst achieving strong replacement ratios suggests management is taking a measured approach. For instance, the company prioritises quality over quantity in reserve booking practices.

Reserve Governance and Independent Validation

The reserves assessment was conducted by Haas & Cobb Petroleum Consultants, an independent petroleum engineering consulting firm. Key aspects of the certification process include comprehensive technical evaluation and industry-standard methodologies.

Independence: Haas & Cobb has no financial interest in Brookside Energy and fees are not contingent on reserve outcomes. This ensures objective assessment and reporting standards.

Technical Standards: Reserve estimates conform to guidelines and definitions set forth in the Petroleum Resources Management System (PRMS). These are approved by the Society of Petroleum Engineers (SPE).

Competent Person: The reserves were compiled under supervision of Mr. Tad Fielder, a Licensed Professional Engineer in Texas. He brings over 25 years of industry experience to the assessment process.

Methodology: Standard engineering practices were applied using base oil and gas prices of $65.34 per barrel and $3.39 per MMBTU respectively. These calculations follow U.S. Securities and Exchange Commission methodology.

Why Should Investors Track Brookside Energy?

The 2025 reserves certification positions Brookside as a disciplined operator successfully executing its development strategy. The company operates in one of North America's premier oil and gas basins.

Proven Execution: Three consecutive metrics showing reserve growth (PDP up 5%, 1P up 7%, 2P up 1%) demonstrate operational consistency. This builds investor confidence through demonstrated performance.

Strategic Focus: The concentrated position in the SWISH play provides operational efficiencies and deep geological knowledge. This translates into superior well performance and cost management.

Development Inventory: The substantial future development locations offer years of drilling runway. This provides multiple opportunities to compound Brookside Energy reserve growth over time.

Independent Validation: Certification by experienced petroleum consultants Haas & Cobb provides third-party validation. This includes both reserve estimates and development assumptions.

Commodity Diversification: The balanced mix of oil (22%), NGLs (31%), and natural gas (47%) provides exposure to multiple energy markets. However, it also benefits from premium NGL pricing structures.

What Makes This Reserve Growth Significant?

"Key Investment Takeaway: Brookside Energy has demonstrated the operational discipline and asset quality that drives long-term value in the oil and gas sector. With 12.52 MMBOE of certified reserves, strong replacement ratios, and substantial development inventory, the company is well-positioned to continue building shareholder value through systematic development of its premier SWISH play acreage."

The reserve certification reinforces Brookside's strategy of disciplined development, quality execution, and systematic reserve conversion. For investors seeking exposure to U.S. unconventional oil and gas development, Brookside's consistent execution and strategic focus warrant continued attention.

The company continues building on its foundation of proven reserves and operational excellence. Furthermore, its measured approach to development ensures sustainable growth whilst maintaining financial discipline across all operations.

Ready to Capitalise on the Next Energy Sector Breakthrough?

Discovery Alert's proprietary Discovery IQ model delivers real-time alerts on significant ASX energy and mineral discoveries, instantly empowering subscribers to identify actionable opportunities ahead of the broader market. Begin your 14-day free trial today and secure your market-leading advantage in the dynamic energy and resources sector.