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- W2294173025 abstract "Abstract The Haynesville Shale, an Upper Jurassic (Kimmeridgian) age calcareous and locally organic-rich mudrock, is one of many prominent shale gas plays in North America. As shale plays increase in importance, the ability to define basin-wide, robust, and stable stratigraphic frameworks using data derived from well-bores becomes increasingly critical. Here, the technique of chemostratigraphy is used to define a stratigraphic framework that extends through ten wells ranging from eastern Texas to northwestern Louisiana. Stratigraphic variations in inorganic geochemistry allow clear differentiation of Haynesville Shale from the underlying Smackover Formation, the Gilmer Lime, and the overlying Bossier Formation. More importantly, however, interpretation of the results allows two chemostratigraphic packages and four geochemically distinct units to be defined and correlated within the Haynesville Shale. The lithostratigraphic units are geochemically differentiated using variations in SiO2, Al2O3, MgO, Zr, and Nb, whereas the units within the Haynesville Shale are defined using changes in CaO, Al2O3, MgO, Fe2O3, Rb/K2O and Th/U values, and V enrichments. By integrating the geochemistry with x-ray diffraction and total organic carbon (TOC) results, it becomes apparent that the driving forces behind the changing geochemistry within the Haynesville Shale are the amounts of anoxia in the lower portion of the Haynesville Shale and of CaO input in the upper portion. Cyclical fluctuations in the relative abundances of Zr and Nb are interpreted to represent transgressive—regressive cycles—and provide enhanced correlation within the Haynesville Shale. By combining stratigraphic changes in Zr/Nb values with V enrichments, it is shown that the most severe period of anoxia is associated with the transgressive portion of the oldest cycle. Importantly, this suggests that this stratigraphic horizon is where maximum TOC can be expected. Lateral changes in geochemistry within the Haynesville Shale demonstrate that terrigenous input was highest in the northwest sector of the basin, primarily in East Texas, and anoxia was greatest in the east of the basin, primarily in Louisiana." @default.
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- W2294173025 date "2013-01-01" @default.
- W2294173025 modified "2023-09-27" @default.
- W2294173025 title "Chapter 7: Chemostratigraphy of the Haynesville Shale" @default.
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