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

Table 1

List of wells used for the estimation of the dedolomitization potential of gypsum dehydration within the study area. The amount of dedolomite within each well which is accounted for by the dehydration fluids or pressure solution is expressed as percentage and in absolute values. Values in bold indicate an insufficiency of dedolomitizing fluids while italic values represent overabundance of dedolomitizing fluids.

Well number	Thickness [m]			Dedolomite content (Ca2) [%]/[m]	Dedolomite accounted for, dehydration [%]/[m]	Dedolomite accounted for, pressure solution [%]/[m]
	A2	Ca2	A1
	6.5	71.5	41	43.7/31.2	0.8/0.3	82.8/25.6
	5.5	82	40.8	98/80.4	0.3/0.2	30.3/24.1
	3	89.5	36.5	94.4/84.5	0.2/0.2	24.6/20.5
	3	122	37.5	90.8/110.8	0.2/0.2	19.2/21.1
	4	107.7	26.9	86.5/93.2	0.2/0.2	17.4/16.1
	4	120	38	99/118.8	0.2/0.2	18.6/21.8
	11.5	51.3	284.4	35/17.9	8.6/1.5	100/153.8
	59.5	226.5	146.5	18.4/41.7	2.6/1.1	100/107.1
	5	101.9	42.9	66.1/67.4	0.4/0.2	37.3/24.9
	2.5	100.4	29.9	95.8/96.2	0.2/0.2	17.7/16.8
	38.5	199.8	90.9	9.4/18.8	3.6/0.7	100/67.3
	28.5	29.5	243.7	3.9/1.2	100/1.4	100/141.5
	29.5	30.5	258.7	14.2/4.3	34.6/1.5	100/149.9
	33	26	170	0/0	100/1.1	100/105.6
	77.9	29	254.9	0/0	100/1.7	100/173.1
	92	31	242.8	0/0	100/1.7	100/174.1
	32.5	32.5	265.9	0/0	100/1.5	100/155.2
	26.9	23	213.5	0/0	100/1.2	100/125.0