(736f) CO2 Sequestration Capacity Estimations for Jacksonburg-Stringtown Oil Field, West Virginia, USA

In order to control or reduce the emissions of carbon dioxide (CO₂), the main component of greenhouse gas, geological capture, utilization and storage (CCUS) of CO₂ in depleted oil and gas reservoirs is considered a favorable near-term approach with potential economic benefits. Coupled CCUS with enhanced oil recovery (EOR) is regarded as a cost-effective and environmentally safe method for long-term storage of anthropogenic CO₂.  Several critical issues impact evaluation and deployment of an integrated system of CO₂ capture, and coupled CO₂ storage and EOR. These include source-sink matching, storage capacity, injection and breakthrough rates, recycling costs, oil recovery factors, and project duration.

The Upper Devonian fluvial sandstone reservoirs in Jacksonburg-Stringtown oil field, which has produced over 22 million barrels of oil since 1895, is an ideal candidate for CO₂ sequestration coupled with EOR because of supercritical depth (>2500 feet), low minimum miscible pressure (941 psi), favorable API gravity (46.5°) and good water flood response. Moreover, Jacksonburg-Stringtown oil field is adjacent to a large concentration of CO₂ sources located along the Ohio River, which potentially supports enough CO₂ to sequestration and EOR without constructing major long-distance new pipelines.

This work provides a more detailed and comprehensive approach to construct a 3-D geological model to estimate CO₂ sequestration capacity. A detailed geological characterization was performed incorporating abundant legacy data with limited modern data including well log and core data using artificial neural network and support vector regression. Depending on the proposed 3-D geological model, the best regions for coupled CCUS-EOR are located in southern portions of the field, and the estimated CO₂storage capacity for Jacksonburg-Stringtown oil field vary between 24 to 383 million metric tons.