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Potential Alternative to Rock-Eval or Wireline Calculations of Toc? Case Study from the Norwegian Continental Shelf
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 83rd EAGE Annual Conference & Exhibition, Jun 2022, Volume 2022, p.1 - 5
Abstract
A potential alternative approach to the Rock-Eval or wireline log calculations of TOC is presented. Rock-Eval analysis was first carried out on 11 samples from 4 wells along the Norwegian Continental Shelf (3 North Sea, 1 Barents Sea). The source rock of interest is the Kimmeridge Formation (local names: Draupne Formation, Formation, Hekkingen Formation). An image analysis technique was then developed and carried out, utilizing SEM on the rock of the same depth for each sample. The data were compared to one another to confirm the accuracy of the technique. Afterward, the technique’s accuracy was compared to the original TOC estimation results for Passey et al. (1990) and Schmoker and Hester (1983) . Additionally, the data was compared to estimations of TOC utilizing these techniques from well logs available for these wells. Results from the current, and other studies, indicate that this alternative avoids potential limitations of the techniques it is compared to (i.e., Rock-Eval). With the dawn of machine learning and increased interest in image analysis, this technique offers a way to characterize the TOC (wt. %) content of organic-rich shales.