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ADMINISTRATIEVE & TECHNISCHE GEGEVENS
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Kaart-Nr: 16E
PLAAT: OOSTMALLE
Nr: 234 (III, c)
Type Boring: Verkenningsboring & peilput S44 (peilbuizen b & c)
Topografische kaart: 8/6
Uitgevoerd te: RIJKEVORSEL
Postnr: 2310
Adres boorplaats: Vrouwkensblok: platform Distrigas DZH 18
Opdrachtgever: SCK voor regionaal hydrogeologisch model*
Boorfirma: n.v. SMET GWT
Boordatum: 1996
Topografie: opgetekend ter plaatse
Stalen door: werfgeologen van Lie Sun Fan
Boringsmethode: spoelboring
Lengte & doormeters: PE peilbuis b: 0-269.05m + 269.05-316.7m + 328.55-340.5
filter 90mm; peilb. c: 0-356.6m + 10.9m filter.
Grondwaterstanden:
1ste maal:
Bij rust :
Tijdens pompen:
Debiet:
Waterzaaknr:
totale diepte: 420 m
Stalen bewaard: ja
Maaiveld/ref. peil: +28.0 m
X: 175790
Y: 225910
NIS-code: 13037
* gesubsidieerd door NIRAS/ONDRAF
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BOORBESCHRIJVING (from Lie Sun Fan et al. 1996)
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van * tot * AARD DER GRONDLAGEN
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0 Dark grey coarse sand with shell fragments and gravel
6.0 Dark grey coarse sand with gravel
8.6 Dark grey coarse sand with gravel
13.0 Dark grey fine clayey sand with mica
17.4 Dark grey very fine sand with mica
21.7 Light grey coarse sand with lignite
26.0 Light grey coarse sand with lignite
27.9 Light grey coarse sand with lignite
33.0 Grey coarse sand with mica and lignite
36.8 Dark grey sand and clay with lignite
37.8 Dark grey coarse sand with lignite
41.8 Dark grey coarse sand
45.8 Dark grey brown coarse sand with lignite and mica
49.6 Dark grey brown coarse sand with lignite and a few shell fragments
53.6 Dark grey fine clayey sand with glauconite, lignite and abundant
shell fragments
57.6 Light brown coarse sand with glauconite and shell fragments
61.5 Dark grey fine clayey sand with glauconite and a few shell fragments
65.5 Dark grey fine clayey sand with glauconite and a few shell fragments
69.5 Dark grey fine clayey sand with glauconite and a few shell fragments
73.5 Dark grey fine clayey sand with glauconite and a few shell fragments
77.5 Dark grey coarse sand with glauconite
81.4 Dark grey coarse sand with glauconite
85.3 Dark grey coarse sand with glauconite
89.3 Dark grey fine clayey sand with glauconite and mica
93.3 Dark grey fine clayey sand with glauconite and mica
97.3 Dark grey medium - coarse sand with glauconite and mica
101.3 Dark grey fine clayey sand with glauconite and mica
105.2 Dark grey fine clayey sand with glauconite and mica
109.1 Dark grey-green fine clayey sand with glauconite and a few shell
fragments
113.4 Dark grey-green clayey sand with glauconite
117.1 Dark grey-green clayey sand with glauconite
121.0 Dark grey-green clayey sand with glauconite
125.0 Dark grey-green clayey sand with glauconite
128.9 Dark grey-green clayey sand with glauconite
132.9 Dark grey-green clayey sand with glauconite and a few shell
fragments
136.9 Black clayey fine sand with glauconite and shell fragments
140.8 Black clayey fine sand with glauconite and shell fragments
144.7 Black clayey fine sand with glauconite and shell fragments
148.7 Black clayey fine sand with glauconite and shell fragments
152.7 Dark grey-green clayey fine sand with glauconite and shell fragments
156.6 Dark grey-green clay with glauconite
160.5 Grey clay with glauconite
164.5 Grey clay with glauconite
168.5 Grey clay with glauconite
172.5 Grey clay with glauconite (15%) and lignite
176.5 Grey clay with glauconite (15%) and lignite
180.5 Grey clay with glauconite (15%) and lignite
184.9 Grey clay with glauconite (30%) and mica
188.8 Grey clay with glauconite and lignite
192.8 Grey clay with glauconite
196.7 Grey clay with septaria fragments
198.39 Grey clay with septaria fragments
206.35 Grey clay with septaria fragments
210.34 Grey clay with septaria fragments
214.34 Grey clay with septaria fragments and pyrite concretions
218.30 Grey clay with septaria fragments
222.30 Grey-brown clay with pyrite concretions and bioturbations
226.22 Grey-brown clay with septaria fragments and pyrite
230.22 Grey-green clay with pyrite tubes and concretions
234.22 Grey-brown clay with pyrite bioturbations and chalk
238.22 Grey-green clay with large pyrite concretions, septaria and
echinoderm fragments
242.25 Grey-green clay with pyrite and echinoderm fragments
246.25 Grey-green clay with bioturbations and septaria nodules
250.25 Grey-green silty clay with septaria fragments and pyrite
254.25 Grey-green silty clay with septaria fragments and pyrite
260.12 Grey-green silty clay with septaria fragments and pyrite
266.12 Grey-green silty clay with septaria fragments and pyrite
270.12 Grey-green silty clay with glauconite
274.12 Green-grey clay with glauconite
278.12 Green-grey clay
282.12 Green-grey clay
286.12 Grey-green sandy clay with pyritised bioturbations and glauconite
290.14 Grey-green clay with silty lenses
294.14 Grey-green clay with silty lenses
298.14 Grey-green clay with pyrite
302.05 Grey-green clay
306.02 Grey-green clay with pyrite concretions
309.94 Grey-green clay
313.92 Grey-green clay with carbonate fragments
317.78 Grey-green hard clay with pyritised bioturbations
321.78 Grey-green hard clay
325.72 Grey-green hard clay
329.72 Grey-green hard clay
333.71 Grey-green sandy (Q: 30%) clay with black spots
337.71 Grey-green silty (Q: 5%) clay with bioturbations and black spots
341.71 Light green-grey silty clay with small pyrite concretions
345.71 Light green grey and brown clay with black spots (concentrations of
glauconite) and sand lenses
349.75 Alternation of light green-grey clay and sand with glauconite and
numerous nummulites
353.79 Alternation of sandstone banks, sand and clay with glauconite and
nummulites
358.78 Light green-grey hard clay with shell fragments and nummulites
362.78 Alternation of sand with abundant shell fragments and glauconite and
light green and brown clay, numerous nummulites and echinoderm
fragments
366.16 Alternation of light green-grey and brown clay, sand and lithified
banks with glauconite and nummulites and echinoderm fragments
370.16 Dark green-grey clayey sand with glauconite, sandstone fragments and
fossils
374.16 Dark green-grey clayey sand with glauconite, sandstone fragments and
fossils
378.16 Dark green-grey clayey sand with glauconite, sandstone fragments and
fossils
382.18 Light green-grey clayey sand with glauconite, sandstone fragments
and fossils
386.20 Light green-grey clayey sand with glauconite, sandstone fragments
and fossils
390.23 Dark green-grey clayey sand with glauconite, sandstone fragments and
fossils
398.28 Green-grey clayey sand with glauconite, sandstone fragments and
fossils
402.31 Green-grey clayey sand with glauconite, sandstone fragments and
fossils
406.34 Green-grey silty clay with glauconite and shell fragments
410.37 Green-grey silty clay with glauconite, sandstone fragments and shell
fragments
414.40 Green-grey silty clay with glauconite, sandstone fragments and shell
fragments
418.43 Green and brown hard clay
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STRATIGRAFISCHE INTERPRETATIE
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Top * basis * STRATIGRAFISCHE EENHEDEN
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5 - 50 m Poederlee Formation: Poederlee Sand, Brasschaat sand
Mol Formation: Mol Sand
50 - 87 m Diest Formation:
087 -138 m Berchem Formation: Berchem Sand
138 -150 m Currently unassigned:Currently unassigned
150 -272 m Boom Formation: Boom Clay
272 -298 m Zelzate Formation: Ruisbroek Sand
298 -304 m Maldegem Formation: S3
304 -307 m A3
307 -314 m S2
314 -333 m A2
333 -339 m S1
339 -356 m A1 Asse Clay
356 -360 m Wemmel Sand
360 -384 m Lede & Brussel Form.:Lede and Brussel Sand
384 -415 m Ieper Group: Egem Sand
415 -420 m Aalbeke Clay
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AUTEUR LIE SUN FAN et al. 1996
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OPMERKINGEN
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1. Commentaar bij de stratigrafische Interpretatie:
Poederlee Sand, Brasschaat Sand and Mol Sand (5 - 50 m)
The recognition of these units is based on the descriptions from
cuttings, as logs were available on non-logarithmic scale only. These units
largely consist of coarse sand in which levels of gravel or shell
fragments occur. The presence of lignite fragments is characteristic and
seems to contaminate the cuttings down to the Boom Clay.
Diest Formation (50 - 87 m)
Fine dark green-grey sand, rich in glauconite.
Berchem Sand - Berchem Formation (87 - 138 m)
The Berchem Sand consists of fine green-grey sand that is rich in glauconite
and that contains some shell banks. The boundary between the Berchem Sand
and the Boom Clay cannot be traced precisely based on the cuttings.
Contamination of shell fragments occurred down to a depth of 150 m.
Currently unassigned (138 - 150 m)
Formerly, this stratigraphic unit was erroneously referred to as the
Eigenbilzen Formation. Its distinctive pattern is shown on the resistivity
log. Below a depth of 150 m the clay content increases progressively.
Boom Clay - Boom Formation (150 - 272 m)
Down to a depth of 175 m clay is alternating with silty layers rich in
glauconite and becoming more clayey. At a depth of 170 m the clay becomes
very compact. The resistivity still decreases below that level to become
quite flat at a depth of 195 m.
The natural gamma reaches a constant high level at shallower depth, i.e. at
180 m. At 254 m depth the resistivity increases slowly, while the natural
gamma decreases. Cuttings show a gradual increase in silt content below 255
m.
There are several hard banks in the Boom Formation. The banks at 196 m,
200 m, 219 m, 242 m and 250 m are septaria and occasional large pyrite
concretions.
The cuttings consist mainly of grey and green-grey clay that is occasionally
rich in septaria and pyrite fragments. The pyrite content (concretions and
bioturbations) is especially high between 220 m and 240 m depth. The few
fossils recognised include echinoderm fragments.
A characteristic feature of the Boom Clay are two silt layers recognised at
a depth of 230 m (dubbelband).
Ruisbroek Sand - Zelzate Formation (272 - 298 m)
These silty sands have a low glauconite content.
S3 (298 - 304 m) and A3 (304 - 307 m) - Maldegem Formation
This unit is represented by grey-green clay with bioturbations and pyrite
(concretions and tubes), becoming more silty at the top.
S2 - Maldegem Formation (307 -314 m)
Dark green-grey clayey sand. S2 could only be recognised on the resistivity
and natural gamma log.
A2 - Maldegem Formation (314 - 333 m)
Grey-green clay, becoming more silty at the base.
S1 - Maldegem Formation (333 - 339 m)
Green-grey silty clay with a few foraminifers and black spots.
A1 Asse Clay - Maldegem Formation (339 - 356 m)
Grey-green clay with greenish hue and black spots. The Bande Noire can be
recognised on the gamma-gamma log around a depth of 355 m, and is taken as the
base of the Asse Clay.
Wemmel Sand - Maldegem Formation (356 - 360 m)
An alternation of glauconite-rich sand and light green-grey clay. Glauconite
grains are coarse and strongly concentrated at some levels, as are the
numerous nummulites. The boundary with the underlying Lede and Brussel
Formations is characterised by the first appearance of hard (lithified)
banks.
Lede and Brussel Sand - Lede and Brussel Formations (360 - 384m)
An alternation of glauconite-rich silty clay, sand and lithified banks with
nummulites and shell fragments at the base. At a depth of 366.16 m, large
nummulites and echinoderms are abundant. At 380 m depth the clay content in
the cuttings is increasing. Hard banks were drilled between 360 and 400 m and
are recognised at the same depths on the ROP and short and long normal logs.
Egem Sand - (384 - 415 m)
No distinction between the Lede, Brussel and Egem Sand can be made from the
cuttings. However, on the resistivity and natural gamma logs the distinctive
pattern of the Egem Sand can be recognised.
Aalbeke Clay - Ieper Group (415 - 420 m)
The Aalbeke Clay refers to the clayey top of the Ieper Group.
The light green-grey, sometimes brown clay is very hard and compact. The base
of the Clay was not reached.
2. De peilputten:
peil in rust in a op 09/04/97: 5.60 m onder het maaiveld
peil in rust in b op 10/12/96: 8.85 m onder het maaiveld
peil in rust in c op 10/12/96: 10.55 m onder het maaiveld
peil in b, na het pompen in b aan 900 l/u (gedurende 25 min): 22.29 m onder
maaiveld.
peil in c, na het pompen in c aan 2200 l/u (gedurende 20 min): 15.78 m onder
maaiveld
