Aquifers

ThermoGIS v2.2 shows the geothermal potential of 29 water-bearing layers or aquifers (reservoirs), five aggregate layers that consist of two or more aquifers ('period') and an overview layer covering all aquifers (see table below). The Nomenclature of the Deep Subsurface on the DinoLoket website provides more geological background on the aquifers.

Table 1 Designation of layers in ThermoGIS and DGM-Deep, and numbers of calibration wells used.

ThermoGIS ‘Period’

ThermoGIS ‘Aquifer’ (Formation/Member)

ThermoGIS code

wells (TG 2.1)

wells (TG 2.2)

wells (DGM Deep v5)

DGM Deep v5 unit (Group)

noThermoGIS aquifers

1641

Upper North Sea Group

Paleogene

Someren Memgber

NMVESO

19

3539

Middle North Sea Group

Voort Member

NMVEVO

58

Steensel Member

NMRUST

14

Berg Member

NMRUBE

421

Brussels Sand Member

NLDOBR

697

-

Lower North Sea Group

Oosteind Member

NLDOO

269

Reusel Member

NLLARE

6

Orp Member

NLLAOR

123

no ThermoGIS aquifers

2683

Chalk Group

Cretaceous

Holland and Spijkenisse Greensand Members

KNGLG and KNGLS

475

524

2740

Rijnland Group

Gildehaus Sandstone Member

KNNSG

362

389

De Lier Member

KNNSL

448

476

IJsselmonde Sandstone Member

KNNSY

197

204

Berkel Sandstone Member

KNNSB

67

100

Rijswijk Member

KNNSR

212

243

Friesland and Bentheim Members

KNNSF and KNNSP

392/736

370/749

Jurassic

Delft Sandstone Member

SLDND

136

84

778

Schieland Group

Alblasserdam Memeber

SLDNA

125

298

noThermoGIS aquifers

-

Posidonia Shale Formation

no ThermoGIS aquifers

588

Altena Group

Triassic

Röt Fringe Member

RNROF

84

94

1016

Upper Germanic Trias Group

Basal Solling Sandstone Member

RNSOB

419

477

Hardegsen Formation

RBMH

87

100

1518

Lower Germanic Trias Group

Upper Detfurth Sandstone Member

RBMDU

50

57

Lower Detfurth Sandstone Member

RBMDL

263

280

Upper Volpriehausen Sandstone Member

RBMVU

72

78

Lower Volpriehausen Sandstone Member

RBMVL

525

607

Nederweert Sandstone Formation

RBSHN

22

23

noThermoGIS aquifers

1830

Zechstein Group

Permian

Slochteren Formation and Upper Slochteren Member

ROSL and ROSLU

782/194

822/255

-

Upper Rotliegend Group

Lower Slochteren Member

ROSLL

127

163

Carboniferous

Hunze Subgroup (Strijen and De Lutte Formations)

DCH (DCHS and DCHL Formations)

21/82

-

-

Limburg Group

Dinkel Subgroup (Hellevoetsluis and Tubbergen Formations)

DCD (DCDH and DCDT Formations)

16/131

-

-

Zeeland Formation

CLZL

-

-

-

-