Sequence Stratigraphic & Subsurface Interpretation
Led by Kenneth D. Ehman, Ph.D., P.G.
Groundwater & Aquifer Architecture■Seismic Stratigraphy & Geomorphology■Environmental Sequence Stratigraphy■Reservoir Frameworks & Subsurface Modeling
Accurate, actionable understanding of the subsurface.
Ehman Earth Sciences, LLC provides expert stratigraphic and subsurface characterization services for groundwater, environmental, and energy projects.
Through the firm, Kenneth D. Ehman, Ph.D., P.G., applies seismic interpretation, sequence stratigraphy, and geologic analysis to define the architecture of the subsurface, and what that means to the distribution of reservoir and seal in oil and gas, and aquifers and aquitards in groundwater.
40+
Years in groundwater, environmental, and energy geoscience
19+
Countries of subsurface project experience
90+
Publications, reports, and technical presentations
USEPA
Best practice built on his groundwater sequence stratigraphy
What we do
Expertise
Integrating seismic data, well logs, and core into stratigraphic frameworks that answer practical questions about where water, contaminants, and hydrocarbons move and are distributed in the subsurface.
01
Groundwater & Aquifer Architecture
Defining aquifers, freshwater–saltwater boundaries, and stratigraphic controls on flow and transport.
02
Seismic Stratigraphy & Geomorphology
High-resolution interpretation of 2D/3D seismic to evaluate reservoir architecture and stratigraphic traps.
03
Environmental Sequence Stratigraphy
Strengthening conceptual site models (CSMs) and evaluating contaminant pathways for RIs and PSAs.
04
Reservoir Frameworks & Subsurface Modeling
Integrating seismic, logs, and core to build reliable subsurface frameworks.
Principal Geologist
Kenneth D. Ehman, Ph.D., P.G.
Kenn is a leading expert in stratigraphic characterization of groundwater aquifers and the first stratigrapher to apply sequence stratigraphy to groundwater remediation and site characterization, an approach now recognized as a best practice by the USEPA. He retired from Chevron in 2025 as Chevron Fellow in Seismic Stratigraphy and Geomorphology, after nearly two decades evaluating major exploration and development opportunities worldwide.
Industry Recognition
- Retired Chevron Fellow, Seismic Stratigraphy & Geomorphology
- Pioneer of groundwater sequence stratigraphy, now adopted as USEPA best practice
- Visiting Scholar, Texas A&M University, teaching graduate seismic stratigraphy
- Professional Geologist in California (No. 6383) and Texas (No. 15875)
Who we work with
One stratigraphic lens, three industries
Water agencies & districts
Aquifer architecture, basin boundaries, and seawater-intrusion studies that support long-term groundwater management, including multi-year work with the USGS and the Water Replenishment District of Southern California.
Environmental consultants & site owners
Stratigraphic site characterization for remedial investigations and preliminary site assessments at industrial, landfill, and federal research facilities, including national laboratories.
Energy & exploration teams
Seismic stratigraphy and geomorphology for exploration and development, drawing on decades at Exxon Production Research and Chevron across basins on six continents.
A method that became the standard
Kenn was the first stratigrapher to apply sequence stratigraphy to groundwater remediation and site characterization. Today it is a USEPA-recognized best practice.
Co-author, Best Practices for Environmental Site Management: A Practical Guide for Applying Environmental Sequence Stratigraphy to Improve Conceptual Site Models (USEPA, EPA/600/R-17/293, 2017)