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Seismic
Curvature Attributes for Fault/Fracture Detection
By Satinder Chopra, Arcis and Kurt Marfurt, University of Houston
Curvature is a measure of how bent a surface is at a particular point. The more bent a surface is, the larger its curvature. To a geoscientist, curvature analysis refers to the study of subsurface strata deformed under stress, to predict the presence of fault and fracture lineaments, that are formed as a result of the deformation. Other stratigraphic features such as channels, reefs, fault truncations also appear to be well-defined on curvature displays, as this article attempts to show.
Mathematically, for a curve, curvature is defined as the
reciprocal of the radius of a circle that is tangent to the
given curve at a particular point (Figure 1). This implies
that curvature will be large for a curve that is bent more
and will be zero for a straight line, whether horizontal or
dipping. As a convention, anticlinal surfaces are assigned
a positive sign for curvature and synclinal surfaces, a
negative sign.
Read article.
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Accident Prevention -
Painless & Profitable
By Carol Vincent, Health &
Safety Champion, Arcis
Most
large companies operate at a small profit margin, some
as small as ½ %. This means they earn only ½ cent for
every dollar taken in. Profit margins of 1% to 5% are
more common but this is still not a lot of "extra"
money. Each time an accident occurs, the cost of the
injury must be subtracted from profits. So, how much do
these incidents really impact your company
in terms of direct and indirect costs? Take a look at
how many additional sales are required to pay for
industrial injuries:
|
ACCIDENT COSTS |
1% profit margin |
5% profit margin |
10% profit margin |
|
|
Additional Sales |
Additional Sales |
Additional Sales |
|
$1,000 |
$100,000 |
$20,000 |
$10,000 |
|
$5,000 |
$500,000 |
$100,000 |
$50,000 |
|
$25,000 |
$2,500,000 |
$500,000 |
$250,000 |
|
$50,000 |
$5,000,000 |
$1,000,000 |
$500,000 |
|
$100,000 |
$10,000,000 |
$2,000,000 |
$1,000,000 |
|
$250,000 |
$25,000,000 |
$5,000,000 |
$2,500,000 |
What
does this chart tell us? If the company is operating at
a profit margin of 5%, then $20,000 in new sales will be
needed to compensate for a $1,000 injury. If the profit
margin is nearer 1%, an additional $100,000 worth of
goods or services are necessary to keep that profit
level. A lot of "widgets" must be manufactured to
compensate for those losses! Since back injuries average
about $5,000 in expenses, every time a worker strains
his back, other employees must work longer and harder to
achieve necessary production levels.
Whatever you do in production, sales or service, think
about the extra hours you must work to help pay for the
average workplace injury. Why should you care about
this? Simple. Safe behavior
can contribute directly to the bottom line as well as to
your own job security. The more profitable your company,
the more likely there will be funds available for better
equipment and improvements in the work environment.
Though money is an important factor, personal well being
is also important. It is always wiser to spend a
bit more time doing the job safely. Think of safety as both pain
free and profitable. Accident prevention is a win-win
proposition!
Eight
Powerful PowerPoint Presentation Tips
- Consider the perspective of the audience - what are the
key messages you want to convey
- Keep it simple - five words per line and five lines per slide
- Minimize numbers in slides - don't overwhelm with figures and numbers
- Use vibrant colours - a striking contrast conveys both a message and an emotion
- Import images and graphics - supplement what PowerPoint offers
- Don't parrot PowerPoint - don't read slides, make eye contact
- Distribute handouts at the end - to avoid distraction
- Edit ruthlessly before presenting - and practice,
practice, practice
We hope you enjoyed the fourth issue of Seismic Matters. If you have
comments or do not wish to receive the quarterly newsletter,
please email
jmahaffy@arcis.com.
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Spring 2007
Seminar Series
Elements of seismic data processing
Wendy Ohlhauser
March 13 or 15
more info
Curvature and coherence attributes – a definite aid in seismic interpretation
Satinder Chopra
March 20 or 29
more info
Structural processing needs tender loving care (TLC)
Dan Negut
April 10 or 12
more info
Spectral decomposition applications beyond the seismic bandwidth
Satinder Chopra
April 17 or 19
more info
Reliable deterministic inversion of Athabasca oil sand
reservoir heterogeneity
Yong Xu
April 24
more info
Wave Equation Summation (WESUM) for prestack time and depth migration
Jianhua Pan & Dan Negut
May 1 or 3
more info
AVO data preparation and conditioning
Yong Xu
May 8 or 10
more info
To RSVP for any of the above seminars,
click here.
For
more information contact Florence
at 781-1437.
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