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Abstract
Chapter from: SG
40: Paleogeography, Paleoclimate, and Source Rocks
Edited By
Alain-Yves HucAuthor:
G. Bessereau, F. Guillocheau, and A.-Y. Huc Geochemistry, Generation, Migration
Published 1995 as
part of Studies in Geology 40
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Chapter 12
*
Source Rock
Occurrence in a
Sequence Stratigraphic
Framework:
The Example of the Lias
of the Paris Basin G. Bessereau
Institut Français
du Pétrole
Rueil Malmaison, France
F. Guillocheau
Université de Rennes
Rennes, France
A.-Y. Huc
Institut Français
du Pétrole
Rueil Malmaison, France
*
ABSTRACT
The appraisal of the petroleum potential
of a sedimentary basin requires a good evaluation of its source rocks.
Sequence stratigraphy appears as a powerful tool for the study of basin-fill
histories and is, at present, used for reservoir characterization purposes.
Here, we demonstrate that this approach is also a powerful tool for predicting
the organic matter distribution by providing a chronostratigraphic framework
in which the role of the main parameters controlling its accumulation can
be approached.
The study was performed at the basin scale
and covers a period of 25 m.y. where different orders of superimposed sequences
were identified. It investigated the Lias (Lower Jurassic) of the Paris
basin, an interval which is known as the bulk source rock for the oil pools
in this basin. It used two methods, both applied on wireline logs: (1)
the Carbolog method, which estimates the in-situ organic carbon content
of the series, showed that the Liassic series was characterized by strong
vertical and lateral variations of total organic carbon (TOC), and by the
occurrence of several organic-rich intervals besides the well -known Schistes
Carton; and (2) the "stacking pattern" method, which produced a consistent
framework of three superimposed sequences which are in keeping with the
global transgressive-regressive (T-R) Lias cycle. These are the genetic
units (0.1 to 0.4 m.y.) of possible climatic origin, the genetic unit sets
(0.6 to 1 m.y.) which might be of eustatic origin, and four minor T-R cycles
(5 to 8 m.y.; i.e., the "stage scale") of clearly tectonic origin. The
study showed a correlation between the distribution of the organic matter
and the sequence stratigraphic framework, at the different sequence orders
evidenced
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