Skip to Main Content
GEOREF RECORD

Enhanced depositional and AVO models for lithologically complex sandstones in the Santos Basin, offshore Brazil

Sabine Klarner, Bernhardt Ujetz and Rogerio L. Fontana
Enhanced depositional and AVO models for lithologically complex sandstones in the Santos Basin, offshore Brazil (in Thematic set; integrating disciplines for petroleum system analysis from seismic interpretation to stratigraphic and basin modelling, H. Ligtenberg (editor) and F. Neves (editor))
Petroleum Geoscience (August 2008) 14 (3): 235-243

Abstract

While exploring for hydrocarbons in rift-related basins, volcanic and volcaniclastic rocks and their erosional products are commonly encountered lithologies. At the reservoir level, the presence of rock types derived from volcanism or affected by post-volcanic re-deposition leads to highly varied complex lithologies with wide ranges of inherent rock properties. In the Santos Basin, a number of exploration wells have encountered basalts emplaced along the basin hinge line that have controlled the sedimentation and basin geometry. The main reservoir units of the basin consist of complex Upper Cretaceous sandstones deposited during periods of active volcanism. For one of the main exploration targets, the Senonian Ilhabela Formation, integrated geological and geophysical interpretation of recently acquired seismic and well data has led to a refined sedimentological model, an enhanced AVO model as well as a deeper understanding of the petroleum system. The encountered sandstones are of shallow-marine and deltaic origin, with local occurrence of mafic volcanic and subvolcanic rocks. Dependent on the presence of volcanic rocks in the vicinity of the particular reservoir, two different types of sandstones with different AVO characteristics have been identified. The presence of volcanic rocks may be interpreted from seismic data by their distinct geometry, usually high amplitudes and unique AVO behavior, expressed as a strengthening of positive amplitudes with increasing offset.


ISSN: 1354-0793
EISSN: 2041-496X
Serial Title: Petroleum Geoscience
Serial Volume: 14
Serial Issue: 3
Title: Enhanced depositional and AVO models for lithologically complex sandstones in the Santos Basin, offshore Brazil
Title: Thematic set; integrating disciplines for petroleum system analysis from seismic interpretation to stratigraphic and basin modelling
Author(s): Klarner, SabineUjetz, BernhardtFontana, Rogerio L.
Author(s): Ligtenberg, H.editor
Author(s): Neves, F.editor
Affiliation: PGS Reservoir, Moscow, Russian Federation
Affiliation: Nederlandse Aardolie Maatschappij, Assen, Netherlands
Pages: 235-243
Published: 200808
Text Language: English
Publisher: Geological Society Publishing House for EAGE (European Association of Geoscientists & Engineers), London, United Kingdom
References: 22
Accession Number: 2009-006447
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col.
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
Secondary Affiliation: Petroleum Development Oman, OMN, OmanWintershall Norge, NOR, NorwayPetrobras, BRA, Brazil
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200904
Close Modal

or Create an Account

Close Modal
Close Modal