Ontario Legacy Well Specialist | Historical Oil & Natural Gas Wells
Development Due Diligence • Private Natural Gas Wells • Historical Well Research • Well Locating & Mapping
Mike Dorland Consulting provides specialized consulting services for identifying, locating, assessing, licensing, and managing legacy wells, historical oil & natural gas wells, private natural gas wells, orphan wells, and abandoned wells across Ontario.
Southern Ontario has a long history of oil and natural gas exploration and production. Thousands of wells were drilled before modern records, accurate mapping, and current plugging standards existed. Many of these wells are poorly documented, inaccurately mapped, buried, overgrown, or completely missing from current digital databases.
For landowners, developers, municipalities, planners, engineers, realtors, and property purchasers, wells can create significant safety, environmental, regulatory, financial, and development risks. The presence of a well can result in substantial costs associated with investigation, licensing, remediation, plugging, regulatory compliance, project redesign, or construction delays. Identifying known and unidentified wells early in the planning or property acquisition process allows these risks and costs to be understood and potentially mitigated.
Legacy Well Services in Ontario
Mike Dorland Consulting assists with:
- Development due diligence for subdivisions and land development projects
- Private natural gas well investigations
- Historical oil & natural gas well research
- Legacy, orphan, and abandoned well assessments
- Petroleum well file and archival research
- Historical Petroleum Well File Review, Including Ontario Oil, Gas & Salt Resources Library and Ministry of Natural Resources Records
- GIS mapping and historical aerial photograph review
- Historical well locating and mapping
- Handheld magnetometer investigations
- Drone magnetic survey planning and interpretation
- Field verification of suspected well locations
- Plugging program design and management
- Regulatory liaison with the Ministry of Natural Resources
Why Legacy Wells Matter
Unplugged, poorly plugged, or deteriorated petroleum wells and water wells can create pathways for oil, natural gas, hydrogen sulfide, groundwater, and other fluids to migrate between geologic formations, into aquifers, and ultimately to the surface. In some cases, leaking oil & natural gas wells can introduce natural gas into shallow aquifers, which may then migrate laterally and reach the surface through nearby water wells, creating significant public safety and environmental risks.
Potential risks include:
- Methane migration
- Hydrogen sulfide concerns
- Explosion hazards
- Asphyxiation hazards
- Groundwater impacts
- Corrosion of well casing
- Unknown subsurface infrastructure
- Construction delays
- Regulatory complications
- Increased costs during development
These risks are particularly important throughout Southern Ontario, where more than a century of oil and natural gas exploration and production has left a legacy of historical oil & natural gas wells that may be undocumented, inaccurately mapped, or improperly decommissioned.
The Problem With Relying Only on Government Well Maps
The Ministry of Natural Resources maintains petroleum well records and digital mapping, but these records should be treated as a starting point only.
Many older wells were drilled before consistent reporting standards existed. Some wells are missing from the database entirely. Others are shown in the wrong location. Historical well descriptions may be vague, incomplete, or based on old lot and concession references that require interpretation.
For proper due diligence, it is often necessary to review original well files, historical maps, microfiche records, aerial photographs, old publications, land records, and other archival sources.
Mike Dorland Consulting brings decades of Ontario petroleum industry experience to this work, including extensive use of the Ontario Oil, Gas & Salt Resources Library and historical petroleum well records.
Legacy Well Locating for Land Development
Historical oil & natural gas wells are a major consideration for residential subdivisions, commercial developments, industrial sites, infrastructure projects, and rural property redevelopment.
Before construction begins, developers and municipalities should understand whether historical oil & natural gas wells or private natural gas wells may exist on or near a property.
Early identification allows project teams to:
- Avoid building over well locations
- Maintain long-term access for future monitoring or remediation
- Plan roads, lots, utilities, and green space around known wells
- Reduce safety and environmental risk
- Avoid costly redesigns
- Prevent construction delays
- Support regulatory compliance
Finding a well during foundation excavation or active construction can create major project disruption. Finding it early allows the issue to be managed properly.
Integrated Well Detection Methods
Mike Dorland Consulting uses a practical, multi-step approach to historical well detection.
1. Historical Records Review
The first step is a detailed desktop review of available historical information, including:
- Ministry of Natural Resources petroleum well files
- Ontario Oil, Gas & Salt Resources Library records
- Ministry of Natural Resources well data
- Historical well cards
- Well logs
- Historical maps
- Aerial photographs
- Land Information Ontario data
- GIS mapping
- Historical reports and publications
This review identifies possible well locations and helps determine whether additional field investigation is required.
2. GIS Mapping and Historical Air Photo Analysis
Historical maps and aerial photographs are georeferenced and compared with modern property boundaries, development plans, and aerial imagery. This helps narrow the search area and identify where wells may have been drilled.
3. Field Investigation
Field investigation may include:
- Visual inspection
- GPS navigation
- Handheld magnetic locator survey
- Shallow probing or excavation
- Investigation of metallic anomalies
- Confirmation of well casing or related debris
Some wells have visible surface expression. Others are buried, overgrown, cut off below grade, or obscured by agricultural, industrial, or construction debris.
4. Drone Magnetic Surveys
For large or complex properties, a high-resolution drone magnetic survey can be an effective tool for detecting buried metallic objects, including well casings.
Drone magnetic surveys are especially useful where:
- The property is large
- Vegetation is dense
- Ground access is difficult
- There is extensive historical industrial activity
- Well locations are uncertain
- Multiple wells may be present
- Development planning requires a higher level of confidence
Drone magnetic data can identify “bullseye” magnetic anomalies consistent with vertical steel well casings. These anomalies can then be investigated and verified in the field using GPS, handheld magnetic equipment, and excavation where necessary. While drone magnetic surveys are highly effective for locating wells that retain steel casing, historical well locations may also be identified through the investigation of well-related metallic debris where casings have been removed.
Private Natural Gas Wells in Ontario
Private natural gas wells are still present on many properties in Ontario. These wells may supply gas to homes, farms, shops, greenhouses, or other buildings.
Mike Dorland Consulting assists property owners, purchasers, realtors, and inspectors with private natural gas well matters, including:
- Well inspections
- Historical research
- Pressure observations
- Licensing questions
- Regulatory review
- Gas well integrity concerns
- Well ownership and responsibility questions
- Plugging and abandonment planning
- Due diligence before purchasing property
A private natural gas well can be an asset, but it can also create safety, regulatory, maintenance, and financial responsibilities. Before purchasing a property with a private natural gas well, it is important to understand the condition, history, licensing status, ownership obligations, and potential risks associated with the well. In some circumstances, significant costs may be incurred for investigation, licensing, repairs, monitoring, remediation, or plugging, making proper due diligence essential before completing a property purchase.
Legacy, Abandoned, and Orphaned Wells
The terminology surrounding old wells can be confusing.
An abandoned well is typically a well that has been formally plugged or decommissioned, although older plugging work may not meet modern standards.
An orphaned well is a well with no identifiable or responsible owner or operator.
A legacy well is a broader term used to describe older inactive wells associated with Ontario’s historical oil and gas industry. This includes wells that may be abandoned, orphaned, poorly documented, inaccurately mapped, or unknown.
Regardless of terminology, the key question is whether the well has been properly located, assessed, and managed.
Why Work With Mike Dorland Consulting
Mike Dorland, P.Geo., C.E.T., has more than 30 years of experience in Ontario’s oil and natural gas exploration and production industry.
His experience includes:
- Historical oil & natural gas well research
- Development due diligence
- Private natural gas wells
- Ministry of Natural Resources-recognized Examiner or Qualified Person
- Legacy, abandoned, and orphan well investigations
- Oil and natural gas exploration
- Well locating and field verification
- Plugging program design and management
- Petroleum well records analysis
- Regulatory liaison
- Ontario Oil, Gas & Salt Resources Library research
Mike has mapped, researched, and investigated hundreds of historical oil & natural gas wells across Ontario using well files, historical maps, aerial imagery, landowner information, handheld magnetic tools, and high-resolution magnetic surveys. His work has assisted landowners, developers, municipalities, planners, engineers, and property purchasers in identifying and managing well-related risks, supporting regulatory compliance, and reducing the potential for costly project delays and unexpected liabilities.
Who Should Call
You should consider a legacy well assessment if you are:
- Buying a property in a historically drilled area
- Selling property with a private gas well
- Developing land in a historically drilled area
- Planning a residential subdivision
- Reviewing a property for municipal approval
- Investigating a suspected old well
- Concerned about methane or hydrogen sulfide
- Trying to locate a historical gas well
- Managing a known private natural gas well
- Dealing with an old well shown on government mapping
- Unsure whether a well exists on your property
Service Area
Mike Dorland Consulting provides legacy well, private natural gas well, historical oil & natural gas well, well locating, and development due diligence consulting services throughout Southern Ontario.
Contact Mike Dorland Consulting
If you are dealing with a private natural gas well, historical oil well, legacy well, orphan well, abandoned well, or a property where old petroleum wells may be present, contact Mike Dorland Consulting before construction, purchase, sale, or redevelopment proceeds.
Early investigation can reduce risk, avoid delays, and provide the information needed to make informed decisions.
Mike Dorland, P.Geo., C.E.T.
President | Mike Dorland Consulting
Professional Geoscientist Ontario | Certified Engineering Technologist
MNR-Recognized Examiner
Phone: 519-532-3469
Email: mikegeo@rogers.com
Website: www.mikedorlandconsulting.com