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Development Geologist Jobs in Illinois (NOW HIRING)

TERRACON

Staff Geologist

Lombard, IL

$68K - $82K/yr

Staff Geologist Location: Lombard, IL Salary - $68,420.00 - $82,060.00 Evaluate and interpret ... development, and remediation projects. Lead and oversee field investigations, including soil ...

Brown and Caldwell

Geologist/Hydrogeologist

Chicago, IL · On-site

The Geologist/Hydrogeologist role is tasked with basic foundational work in the fields of geology ... development opportunities. For more information, visit www.brownandcaldwell.com This position is ...

Brown and Caldwell

Geologist/Hydrogeologist

Chicago, IL · On-site +1

The Geologist/Hydrogeologist role istasked with basic foundational work in the fields of geology ... development opportunities. For more information, visit www.brownandcaldwell.com This position is ...

TRC Companies, Inc.

Geologist

Chicago, IL · On-site

$55K - $72K/yr

... training and the development of new skills and certifications. Overview TRC Environmental ... A. in geology (M.S. preferred) with a designated geologic focus. * Valid Driver's License and ...

Rock Valley College

Adjunct - Geology

Rockford, IL · On-site

Adjunct - Geology Department: Physical Science (PHS) Division: Mathematics & Sciences (MAS ... Experience with curriculum development and assessment is preferred. * Interest in involvement in ...

Rock Valley College

Adjunct - Geology

Rockford, IL · On-site

Adjunct - Geology Department: Physical Science (PHS) Division: Mathematics & Sciences (MAS ... Experience with curriculum development and assessment is preferred. * Interest in involvement in ...

LSU AgCenter

Research Associate 3, 4, or 5

Energy, IL · On-site

This position supports the Louisiana Geological Survey's research and mapping mission through cartographic production, geographic information systems (GIS) data development, and spatial data analysis.

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All JobsDevelopment Geologist JobsDevelopment Geologist Jobs in Illinois

Development Geologist information

See Illinois salary details

$23.7K

$89.2K

$144.3K

How much do development geologist jobs pay per year?

As of Aug 11, 2026, the average yearly pay for development geologist in Illinois is $89,234.00, according to ZipRecruiter salary data. Most workers in this role earn between $55,719.00 and $128,550.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a development geologist, and why are they important?

To thrive as a Development Geologist, you generally need a degree in geology or earth sciences, with expertise in sedimentology, stratigraphy, and reservoir characterization. Familiarity with geological modeling software (such as Petrel), seismic interpretation tools, and experience with well log analysis are typically required. Strong analytical thinking, attention to detail, and effective teamwork and communication skills are crucial in this role. These skills are vital for accurately evaluating subsurface formations, optimizing hydrocarbon extraction, and collaborating with multidisciplinary teams to maximize resource development.

How does a development geologist typically collaborate with engineers and other subsurface professionals on oil and gas projects?

Development Geologists work closely with reservoir engineers, drilling engineers, and geophysicists to optimize field development plans. They interpret geological data to create detailed reservoir models, which guide drilling locations and production strategies. Regular cross-disciplinary meetings and data-sharing are common, ensuring that geological insights are integrated with engineering constraints to maximize resource recovery. This collaborative environment helps align project goals and troubleshoot challenges as they arise.

Is there a high demand for development geologists?

Development geologists are in steady demand in the oil and gas industry, especially in regions with active exploration and production. They are valued for their skills in analyzing subsurface data, using tools like seismic interpretation and geological modeling, which are essential for identifying and developing hydrocarbon reservoirs.

What is the difference between Development Geologist vs Exploration Geologist?

AspectDevelopment GeologistExploration Geologist
CredentialsBachelor's or Master's in Geology, often with industry certificationsBachelor's or Master's in Geology, often with certifications
Work EnvironmentOn-site at oil and gas fields, working with drilling and production teamsFieldwork in remote areas, conducting surveys and sampling
Industry UsageFocuses on developing known reservoirs and optimizing productionFocuses on discovering new reserves and exploration activities

Development Geologists primarily work on mature fields to enhance extraction, while Exploration Geologists seek new reserves. Both roles require similar educational backgrounds and certifications but differ in their focus and work environment.

What does a development geologist do?

A development geologist analyzes subsurface rock formations to identify and evaluate hydrocarbon reservoirs, supporting the drilling and production of oil and gas. They interpret geological data, create maps, and collaborate with engineers to optimize extraction processes, often using tools like seismic surveys and geological modeling software.
What are popular job titles related to Development Geologist jobs in Illinois? For Development Geologist jobs in Illinois, the most frequently searched job titles are:
What job categories do people searching Development Geologist jobs in Illinois look for? The top searched job categories for Development Geologist jobs in Illinois are:
What are popular job titles related to Development Geologist jobs in IL? For Development Geologist jobs in IL, the most frequently searched job titles are:
Development Geologist jobs near you
Infographic showing various Development Geologist job openings in Illinois as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $89,234 per year, or $42.9 per hour.

Staff Geologist

TERRACON

Lombard, IL

$68K - $82K/yr

Full-time

Posted 6 days ago

Terracon rating

7.5

Company rating: 7.5 out of 10

Based on 119 frontline employees who took The Breakroom Quiz

49th of 72 rated business consultants

Job description

Staff Geologist

Location: Lombard, IL

Salary - $68,420.00 - $82,060.00


Evaluate and interpret subsurface investigation data, including soil, groundwater, and bedrock conditions, to assess environmental and geologic site characteristics and support engineering design recommendations. Develop detailed subsurface maps, geologic models, and cross-sections while collaborating with multidisciplinary teams of engineers, geologists, and environmental scientists on complex infrastructure, development, and remediation projects.

Lead and oversee field investigations, including soil borings, groundwater monitoring well installation, environmental sampling, and geotechnical testing activities. Analyze soil stratigraphy, groundwater elevations, hydrogeologic conditions, and environmental analytical data to identify site constraints, assess risk, and support regulatory compliance.

Prepare comprehensive technical reports, work plans, and environmental documentation related to site characterization, due diligence, remediation, and construction support activities. Contribute to projects involving earthwork and foundation design, Phase I and Phase II Environmental Site Assessments (ESA), groundwater monitoring and sampling programs, remediation planning, well design, and seismic and geologic hazard evaluations.

  • Bachelor's degree in Geology, Hydrogeology or related field and a minimum of 3 years' related experience.
  • Master's degree preferred.
  • A valid driver's license with acceptable violation history may be required.
  • Preferred Qualifications:
    • Certification in field of expertise
  • Follow safety rules, guidelines and standards for all projects. Participate in pre-task planning. Report any safety issues or concerns to management.
  • Be responsible for maintaining quality standards on all projects.
  • Proficient Geologist/ Hydrogeologist responsible for conducting site testing and making recommendations for systems design on smaller projects of minimal complexity.
  • May assist more senior Geologists on large, more complex projects.
  • Performs site visits, field observations and field data collection or assignments.
  • Implements technical requirements to complete client projects by directing and supervising field staff to sample, test and collect data and/or document site activities.
  • Responsible for developing written proposals to clients for approval by senior level professionals.
  • Evaluates moderately complex laboratory and field data and assembles in written reports.
  • May serve as team member or participate in meetings and communications with client pertaining to specific projects/tasks.
  • May oversee work performed by lower-level Geologists/Hydrogeologists.

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