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
Ohio Geological Society
Abstract
OGS-AAPG
Structural Influences on Oil and Gas Reservoirs: Third Annual Technical Symposium, October 25,
ABSTRACT: ADVANCED
SEISMIC
INTERPRETATION OF ROSE RUN REMNANTS IN OHIO
ABSTRACT
The variety of Rose Run trap styles has outgrown simple
interpretation on a black-and-white paper seismic
section.
A Rose Run remnant (or what looks like a remnant?) is
easily identified with moderately good quality
seismic
data,
but the critical details of the prospect remain concealed
within the
seismic
data. The key to greater drilling success
in the Rose Run play is to first understand the geology,
relate the geology to the
seismic
data, and then interpret
that data to exploit the concealed details within by using
advanced
seismic
interpretation techniques.
The advanced seismic
interpretation process begins with
quality
seismic
acquisition and processing. Acquisition and
processing should be designed on the signal and for high
frequency content. The second step is to phase-correct the
seismic
data and, if applicable, enhance frequencies (whiten
data) using interpretive wavelet processing that requires a
sonic log. A sonic log provides reflection coefficients which
are used to correct for phase (and reflection identification in
wildcat areas). Once the correct phase is established, the
amplitude spectra are analyzed for frequency range and
balance. The amplitude spectra are easily whitened if the
seismic
data contain high frequencies and is not
high-frequency cut. After identification and interpretation
of key reflectors is complete, isochron graphing is compared
to known geology and can indicate thickening or thinning of
rock section at the Knox Unconformity. Next, analysis of
individual reflectors is performed to enhance details in
seismic
waveform and amplitude. Waveforms exhibit different
character with different frequencies and with different
geology and can provide clues to formation thickness
and geologic sequence. Detailed wavelet character is interpreted
by understanding the relationship of the local geology
to the
seismic
information, regional geology and the
frequency content of the
seismic
data. Amplitude graphs
support lithology interpretations and can indicate changes
in reservoir porosity and fluid/gas content. Time picks from
reflection interpretations are then used to construct time-
structure maps of two or more
seismic
lines and show local
and/or regional geological relationships between remnants.
Time picks are also used to show 2-D
seismic
anomaly
shapes and are interpreted for clues to paleotopography
and remnant trends (important for guiding lease and
seismic
programs).
Rose Run
seismic
anomalies typically exhibit
a low-angle dip slope (backside) and an escarpment
face (frontside). Finally, detailed
seismic
modeling
is the
answer for questions concerning
seismic
anomalies, detailed
seismic
character, and amplitude tuning.
ADVANCED
SEISMIC
INTERPRETATION PROCEDURE (ASIP) FOR ROSE RUN REMNANTS
- Do
seismic
acquisition and processing designed for a broad range frequency content.
- Phase-correct
seismic
data.
- Analyze amplitude spectra and whiten
seismic
data.
- Identify key reflectors.
- Integrate geology from local and/or regional wells.
- Isochrons
- Waveform
- Amplitude
- Isochrons
- Time-structure mapping
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
![Previous Hit](/data/images/arrow_left.gif)
![Top](/data/images/arrow_up.gif)