Upper Maastrichtian pelagic limestone
K-T Boundary Sequence Core Top
1,650 Stratigraphy 0 6
Paleocene pelagic marl and limestone
1,400 Unit 3 Unit 2 1,450
Gamma Ray gAPI 100 Caliper in.
Resistivity
Laterolog Shallow Laterolog Deep
16 0.2 ohm.m 3,000 1,350
Base 1,500
K-T boundary sedimentary succession
Oilfield Review Autumn 09 Impact Fig. 17
Unit 1 ORAUT09-Impact Fig. 17 1,600 1,550
Upper Maastrichtian pelagic limestone
1,650
> Stratigraphy, well log expression and samples of the K-T boundary sedimentary succession in the Cantarell oil field. The stratigraphy in Well C-91 (top right) exhibits a well-defined fining-upward trend from Unit 1 to Unit 3. Units 1 and 2 are carbonate breccias forming the reservoir facies. Unit 3 is a shaly ejecta-rich layer that acts as a seal. Core samples (top left) from Cantarell Well C-1016 show the gradation from the coarse-grained calcareous breccia of Unit 1 at the base to the fine-grained calcareous breccia of Unit 2 at the top. The dark color in this succession is due to oil stain. Core diameter is 10 cm [4 in.]. (Stratigraphy and log data adapted from Murillo-Muñetón et al, reference 41.)
Top
Base
> Core samples from the uppermost part of the K-T boundary sedimentary succession in the Cantarell oil field. These samples from Well C-227D contain abundant shock-metamorphic minerals from the Chicxulub impact event. Core diameter is 10 cm.
Oilfield Review Autumn 09 Impact Fig. 17
Winter 2009/2010
ORAUT09-Impact Fig. 17 27
Depth, m
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