Upper Werkendam Member ATWDU


Premise Definition after NAM and RGD (1980) .
Type section Location map See figure (pdf)
  Well Werkendam-2 (pdf)
  Location N 51°47’29.7
E 04°50’22.1
  Depth 1746 to 1953 m.
  Length 207 m. along hole
  Reference NAM and RGD (1980)
Definition A grey, homogeneous, somewhat marly, claystone, exhibiting a uniform, low acoustic-velocity and resistivity response on wire-line logs. The unit rests conformably upon the more calcareous Middle Werkendam Member. In a complete succession it is covered by the Brabant Formation. The basal member of the Brabant Formation displays an upward increase in limestone and sandstone content, reflected by a clear funnel shape on most wire-line logs (lower GR, higher sonic-velocity and resistivity readings). The base of the Brabant Formation has been placed at the base of the first clean limestone bed, marked by a sharp log peak.
References See References Lower and Middle Jurassic

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].