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An Image-based Equation for Estimating the Prospective Carbon Dioxide Storage Resource of Organic-rich Shale Formations

Journal Article · · International Journal of Greenhouse Gas Control
; ; ; ;  [1];  [2]; ; ; ;
  1. AECOM
  2. NETL
+ Show Author Affiliations
An image-based volumetric equation for estimating the prospective CO<sub>2</sub> mass storage resource potential for organic-rich shale formations has been developed using data obtained from advanced image analysis of Bakken Formation samples. The equation is a modification of the U.S. Department of Energy (DOE) National Energy Technology Laboratory’s (NETL’s) volumetric equation methodology for estimating the prospective CO<sub>2</sub> mass storage resource for shale formations (Levine and others, 2016). The current equation enhances the volumetric equation methodology by systematically deriving expressions for calculating efficiency factors based on analysis of high-resolution field-emission scanning electron microscopy (FESEM) images obtained from shale formation rock samples. The CO<sub>2</sub> storage resource potential for an organic-rich shale is divided into two major parts: free-phase storage in void spaces (pores and fractures) and CO<sub>2</sub> adsorption onto solid surfaces, primarily organic matter (OM) and clays. High-resolution FESEM images are used to obtain improved nanoscale porosity estimates for the shale matrix and nanoporosity in porous OM. The calculation of the efficiency factors associated with free-phase storage and adsorption onto solid surfaces are based on a ratio of connected-to-nonconnected porosity and the newly-developed shared border analysis (SBA) method, respectively. The image-based equation described herein is structured so that it can be adapted and applied to other formation types different from organic-rich shales by considering the specific mineralogy or matrix characteristics of the given formation reservoir. Preliminary data used to illustrate the newly-developed equation show that the Upper Bakken Shale (UBS) may have a lower prospective CO<sub>2</sub> storage resource potential than the Lower Bakken Shale (LBS) by about 65%. Although these results are neither optimized for each lithofacies nor represent the Bakken formation regional scale, they are encouraging for unfractured shale samples and serve as a useful starting point for future evaluations at the regional scale.
Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
OSTI ID:
1771110
Report Number(s):
NA
Journal Information:
International Journal of Greenhouse Gas Control, Journal Name: International Journal of Greenhouse Gas Control Journal Issue: 103038 Vol. 98; ISSN 1750-5836
Country of Publication:
United States
Language:
English

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