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Fine-grained mudrocks are enriched and/or depleted in a variety of major and trace elements, and the enrichment or depletion of these elements corresponds to specific depositional environments, sedimentary facies, mineralogy, and provenance. Chemostratigraphy employs major and trace elemental data to understand geochemical variability within sedimentary sequences. The results and interpretations of this type of analysis can aid in the identification of ideal acreage positions and/or defining horizontal well target zones when integrated with other datasets to determine reservoir quality. Major elements are used to calculate the brittle mineral fraction while redox-sensitive trace elements are used as paleodepositional proxies to...

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