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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Jens Grützner2 and Jürgen Mienert3
1Manuscript received February 5, 1998; revised manuscript
received February 2, 1999; final acceptance March 16, 1999.
2GEOMAR Forschungszentrum für marine Geowissenschaften,
Wischhofstr. 1-3, D-24148 Kiel, Germany; e-mail: [email protected]
3GEOMAR Forschungszentrum für marine Geowissenschaften,
Wischhofstr. 1-3, D-24148 Kiel, Germany. Now at Department of Geology,
University of Tromsø, Dramsveien 201,N-9037 Tromsø, Norway.
ABSTRACT
wave
velocity (vertical and
horizontal), and acoustic impedance characterize five successive diagenetic
stages: (1) compaction of ooze, (2) breakage and dissolution of fossil
tests, (3) formation of chalk through precipitation of calcite, (4) cementation,
and (5) compaction of calcite crystals. Age-depth information from the
drill sites was
used
to calculate the average duration of these processes
in Atlantic Ocean basins. The model can predict carbonate sediment physical
properties down to a burial depth of 1000 m. The model is presented for
both lab and in-situ conditions and thus can serve as a standard for comparison
with lab, log, and seismic measurements. An acoustic impedance vs. age
curve derived from the model allows estimation of the initial and present-day
diagenetic
potential
of carbonate sediments and chalk reservoirs.
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