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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Chapter from:
(Publication Subject: Seal
Potential: Example from the Talang Akar Formation,
Offshore Northwest Java, Indonesia
Chapter 6
Evaluating
Seal
Potential: Example from the
Talang Akar Formation, Offshore Northwest Java, Indonesia
by
J.G. Kaldi
ARCO Indonesia Jakarta, Indonesia
C.D. Atkinson
ARCO British Ltd. Guildford, United Kingdom
ABSTRACT
seal
potential of various lithologies in the Upper
Oligocene Talang Akar Formation (TAF) is evaluated in the BZZ area of offshore northwest
Java.
Seal
potential comprises (1)
seal
capacity
(the calculated amount of hydrocarbon
column height a lithology can support); (2)
seal
geometry (the structural position,
thickness, and areal extent of the lithology); and (3)
seal
integrity (
rock
mechanical
properties such as ductility, compressibility, and propensity for fracturing).
Seal
capacity
is determined by mercury injection capillary pressure (MICP) analyses.
Seal
geometry is derived by integrating seismic data, core, detailed well correlations,
regional sedimentological/stratigraphic relationships, and comparisons to known
depositional analogs.
Seal
integrity is evaluated qualitatively by core examination,
borehole imaging, and petrographic studies. These three variables were integrated and the
totals were "ranked." In the BZZ area, deltaic distributary channel sandstones
and delta-front/mouth bar heterolithic sandstones comprise the main reservoirs. Possible
seals include prodelta, delta-front, and delta-plain shales; channel abandonment silts;
and transgressive shelf carbonates in both the upper and lower TAF.
Seal
potential is best
in the delta-front shales, which have high
seal
capacity
and are thick, laterally
continuous, and very ductile.
Seal
potential is moderate in the thicker (upper TAF)
transgressive carbonates. These rocks have high
seal
capacity
and excellent lateral
continuity, but are brittle and, hence, prone to fracturing. Delta-plain shales and
prodelta shales are poor seals due to their limited
seal
capacity
(delta-plain) or because
they are too thin (prodelta shales). Channel abandonment siltstones have even poorer
seal
potential because of small lateral extent and limited
seal
capacity
. The least favorable
seal
potential occurs within the thin (lower TAF) carbonates. These rocks are relatively
thin, as well as being prone to fractures.
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