Appalachia – Marcellus Play

Marcellus Play Map

Marcellus Horizontal Production


The graphic above presents all Marcellus Shale horizontal wells completed in the Appalachian Basin since 2008.

The Marcellus Shale is the most productive shale gas reservoir in North America, and Energy Information Administration (“EIA”) data indicates that more than 34% of current U.S. dry shale gas production is sourced from this play as of 2021. Strong porosity, high organic content, and significant geopressure help to make this interval a world-class reservoir.

Historically, development has been concentrated in the southwest and northeast areas of Pennsylvania, and also in West Virginia. Development of the Marcellus Shale in New York has been limited due to governmental restrictions.

Methodology Overview

VSO sourced landing bench and production data from IHS to prepare these maps.

Reservoir & Geologic Studies

VSO has completed extensive analysis of well performance and productivity throughout the Appalachian Basin. Additional reservoir and geologic capabilities include:

Assessment of Development Potential and Risks

Type Well Analysis

Evaluation of Well Performance and Interference

Midstream/Supply Studies

Audits/Evaluations of Producing Assets

Key Cross-Sections

Reservoir Quality Maps – Porosity, TOC, OOIP

Upside development Reservoir Quantity Maps – Gross and Net Isopachs

Pressure Trends

Maturity & GOR Impacts