Dedolomitization Potential of Fluids from Gypsum-to-Anhydrite Conversion: Mass Balance Constraints from the Late Permian Zechstein-2-Carbonates in NW Germany

Figure 7

(a) The contour map displays the color coded percentage (0–100%) of dedolomite on the Ca2 bulk sediment within the study area. Values are interpolated from the well data provided by EMPG and annotated at each well. White contour lines represent the distribution of thickness of the Ca2 within the study area. (b + c) The contour maps represent the discrepancy between the dedolomitization potential of the calculated dehydration fluids (b) and fluids released due to pressure solution (c) and the actual observed amount of dedolomite. All contour maps overlie the paleogeography of the Ca2 in northern Germany during late Permian times (modified after Strohmenger et al. [1]). (d) Dedolomite content and dedolomitization potential of dehydration and pressure solution fluids were determined on a well-by-well basis (here Well ) and then interpolated between the wells to create the contour maps in (b) and (c).

(a)

(b)

(c)

(d)