About This Item
- Full text of this item is not available.
- Abstract PDFAbstract PDF(no subscription required)
Share This Item
The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: High-Resolution
Sequence
Stratigraphy
Using
Well
Logs and Cores
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
By
Sequence
stratigraphy is the study of sedimentary
rocks within a framework of genetically related facies
bounded by chronostratigraphicaly significant surfaces.
Using the concepts of
sequence
stratigraphy, it is possible
to construct a high-resolution chronostratigraphic framework
from
well
logs, cores, and outcrops for the
analysis
of
reservoir, source, and sealing rocks at a reservoir to
regional scale.
The sequence
is the fundamental stratal unit for a
sequence
stratigraphic
analysis
.
Sequence
boundaries are
areally continuous surfaces within a basin, interpreted to
form as a result of a eustatic fall (Vail et al, 1977). The
sequence
boundary is overlain and underlain by rocks of
different ages; but all of the rocks above the boundary are
younger than all the rocks below the boundary, so the
boundary has time-stratigraphic significance.
There is a distinct break in deposition and a basinward
shift in facies across the unconformable portion of a type-1
sequence
boundary, making it a natural surface for separating
facies above and below. Recognition of
sequence
boundaries on
well
-
log
cross sections is essential for accurate
lateral and vertical facies
analysis
leading to reservoir
mapping and distribution prediction.
Parasequences are the building blocks of the sequence
.
Aggradational, progradational, and retrogradational
stacking patterns of parasequences are used to subdivide
the
sequence
into systems tracts. Parasequence boundaries
are locally continuous surfaces interpreted to form as a
result of a relative rise in sea-level, and are ultra high-resolution
chronostratigraphic surfaces used to correlate
time and facies from
well
logs within a
sequence
framework.
Integration of sequence
and parasequence correlation
concepts provides techniques to look at basins in fresh ways
resulting in: 1) definition of new play types, opening up
heavily drilled basins for new exploration, 2) improved
ability to define and locate subtle, but potentially profitable
stratigraphic traps, and 3) a more integrated stratigraphic
framework for risking new plays.
End_of_Record - Last_Page 7---------------