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AVO Data
Preparation and Conditioning
Presented by Yong Xu
December 4th or December 6th, 2007
11:45 to 1 pm (lunch provided)
Suite 2600, 111 - 5th Ave SW, East Petro-Canada Tower
Limited seating, click here to
RSVP
This
is the seventh in a series of lunch & learn seminars, see
the sidebar for information on the other topics.
An essential element in AVO interpretation
is the quality of
the AVO gathers. The gathers suitable for AVO interpretation and analysis have to be AVO preserved and
the signal-to-noise ratio
should also be quite high. In order to achieve this, the basic processing must be AVO friendly.
This means that AVO is preserved in every step of the
processing flow without any trace-to-trace operations; amplitude scaling is based on
the gathers. AVO friendly noise attenuation must be applied for a few rounds
of coupling with scaling. Some steps which are less significant and ignored for generating stacked volumes must be handled
more carefully in order to create AVO suitable gathers.
For example, for a 3D volume, unevenly distributed fold affects
the AVO reliability and PSTM gather quality.
AVO conditioning is
another important requirement in generating high quality gathers.
The gathers should reasonably tie with the AVO modeling at
the well controls. There are issues that are not usually solved in the basic processing, such as NMO stretching and offset dependent tuning, interbed
multiples, and residual NMO. These issues bias the interpretation from the AVO interpretation framework, and have to be corrected by AVO conditioning.
The outline of the talk is listed below and a number of real data examples are used to demonstrate what ARCIS does to generate the BEST AVO gathers.
1. AVO friendly processing:
a. Deterministic modules and AVO
preserving relative amplitude flow
b. 3D specific:
i. Adaptive supergathers
ii. PSTM issues
2. AVO conditioning (if
the basic processing is done)
a. How to QC AVO preservation
i. Mud-rock driven
ii. Frequency dependent
b. AVO preserved noise attenuation – interbed multiple reduction
c. Stretching
and tuning corrections
d. Residual NMO removal – preserving class II AVO
e. Amplitude scaling – remedies for less AVO-friendly
processed
gathers.
To learn more, attend the
lunch & learn session on December 4 or December 6.
Click here to RSVP.
This course is
available as a free in-house seminar. For more
information contact Florence Janzen, 781-1437 or email
fjanzen@arcis.com. |
