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Webinar: Variations in Produced Water Chemistry and Relation to Regional Geology and Production in the Marcellus Shale, Northcentral West Virginia (60 mins.)

  • August 24, 2021
  • 1:00 PM
  • Webinar
  • 165

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Variations in Produced Water Chemistry and Relation to Regional Geology and Production in the Marcellus Shale, Northcentral West Virginia

Presenter

Jonathan Brady, P.G.

Thrasher Group


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Level: Intermediate

Who should attend:  Geologists interested in the Marcellus Shale, Geochemistry, Water Chemistry, Produced Water Trends

Webinar Overview:  An investigation of 74 Marcellus Shale wells across northcentral West Virginia indicates changes in produced water chemistry and hydrocarbon production can be related to geologic conditions based on well logs and core data. Moving west to east from Harrison County to Taylor County, then north into Monongalia County, gamma-ray logs show increasing intensity, especially in the Middle and Lower Marcellus. Mineralogical X-Ray Diffraction from core data indicates increasing clay content moving west to east with associated decreases in quartz minerals. Produced water analyses show changes in barium, calcium, and strontium concentrations from west to east indicating volume changes in clay and carbonates, potentially in the form of carbonate cement, are occurring across the study area.

The geological differences result in varying produced water behaviors. These behaviors are determined by reviewing multiple produced water analyses for individual wells for periods up to ten years. Total dissolved solids concentrations typically reach their maximum value during the second year of production after which areas in Harrison County show both increasing and decreasing concentrations over time, while areas in Taylor and Monongalia show almost exclusively decreasing concentrations over time. With total dissolved solids concentrations dropping below the maximum values, relative ratios of formation water versus fracturing fluid can be determined to characterize a well’s behavior as it ages. Normalized, cumulative gas production for the wells show that the geologic differences observed in the produced water behavior are reflected in different production rates across the study area.

About our Presenter Jonathan Brady is a Licensed Professional Geologist in Pennsylvania and recently achieved a personal goal of obtaining his Master’s Degree in geology from WVU. He earned his BS in geology from the University of Pittsburgh and spent the majority of his career in the oil and gas industry. Jonathan is the Eastern Section Councilor for the AAPG Division of Professional Affair and the incoming Treasurer for the Pittsburgh Association of Petroelum Geologist. He recently began the next phase of his career as a Project Manager for the Thrasher Group in their Pittsburgh office focusing on geologic and energy related projects.  






 

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