AASPI Seismic interpretation of ree Sand channels on the ...
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Seismic interpretation of Cree Sand channels on the Scotian Shelf Rustam Khoudaiberdiev, Craig Bennett, Paritosh Bhatnagar, and Sumit Verma*
The University of Texas of the Permian Basin
Potential reservoirs can be found within deltaic channels, these
channels have the ability to form continuous transport systems for
hydrocarbons. Distributary sand-filled channels in particular can serve
as excellent reservoirs. The emphasis of this study is taking a detailed
look into the sand channels within the Cree Sand of the Logan Canyon,
as well as using coherence and coherent energy seismic attributes to
delineate these features. Extensive studies have been performed in
analysis of deltaic channel systems and their ability to act as reservoirs
for hydrocarbons. The paper will follow an equivalent approach,
employing 3D seismic survey data and seismic interpretation techniques
to identify and map sand channels. The study area is focused on the
Penobscot field, located off of the eastern shores of Nova Scotia.
ABSTRACT
AASPI software was used to compute seismic attributes. Petrel (Schlumberger) was used for seismic interpretation. Nova Scotia
Department of Energy for keeping the Penobscot 3D seismic survey data open source. For questions, please email
GEOLOGY OF THE STUDY AREA
ACKNOWLEDGEMENTS
Figure 1(a). Location map of the
study area (Google Earth Maps).
The Penobscot 3D seismic sur-
vey is displayed in the yellow rec-
tangle.
Figure 2. Stratigraphic column
of the study area. The first
track indicates measured
depth. The second track
shows the gamma ray log for
well L-30, the darker color sig-
nifies high gamma ray values,
which indicates shaly facies,
whereas the light colors are for
low gamma ray values, indi-
cating sand rich facies. The
third track shows the name of
the formation and geological
age (modified from Bhatnagar
et al., 2017).
SEISMIC ATTRIBUTE STUDY
Figure 3. (a) Time structure
map of Petrel top surface, Well
L-30 shown as a green dot in
Figure 3a. (b) Seismic ampli-
tude section through AA’.
Gamma ray log from the L-30 well is posted on seismic to indicate the sandy
and shaly lithology (see Figure 2 for color scale). Annotations on the right
hand side indicate the name of the formation tops (in black regular font) and
their ages (in light blue italics font).
Figure 4. Channel delineation with the help of seismic attributes. In left (a, c and e) seismic amplitude on
the vertical sections (same color bar as Figure 3b), and coherent energy on a stratal slice. In right (b, d, f)
coherence stratal slices. This figure shows three levels of channels, from deepest (a and d) to shallowest (e
and f). For clarity, we indicate these stratal slices as levels I, II and III. Notice that the deepest stratal slice,
Level I (a and b, at stratal slice 614 ms below Petrel) shows relatively thin channels. Whereas at the shal-
lower Level II (c and d, at stratal slice 490 ms below Petrel) contain broader channels, and the shallowest
Level III (e and f, at stratal slice 430 ms below Petrel) shows even broader channels.
CONCLUSIONS
Figure 5. Interpretation of
the deltaic channels based
on the seismic attribute in-
terpretation. (a) sea level
curve, obtained from Haq
et al, 1987. (b-d) the
changing position of the
delta due to sea level,
from older to younger.
Here, this model is bound-
ed by the orange rectangle
shown in the Figure 1. The
dashed line represents the
Aptian paleo shelf break.
Bhatnagar, P., C. Bennett, R. Khoudaiberdiev, S. Lepard and S. Verma, 2017, Seismic attribute illumination of a synthetic transfer zone: submitted for 87th Annual International Meeting , SEG Expanded Abstracts.
Google Earth Maps, https://www.google.com/earth/, browsed on March 15, 2017.
Haq, B.U., J. Hardenbol, and P.R. Vail, 1987, Chronology of fluctuating sea levels since the Triassic: Science, 235, 1156-1187.
REFERENCES
COHERENCE AND COHERENT ENERGY ATTRIBUTES
AASPI