Well-Log Data with Seismic Flashcards
Well Logs have ____ vertical Resolution and ___ lateral resolution
High vertical Res – cm
Poor lateral res – 100 to 1000m
Seismic Data has ____ vert res and ____ lateral resolution
Poor vert res – 30 to 100 m
Good lat res – 10m
what is the purpose of well log interpolation?
attempt to fill information between logs
When correlating well data with seismic, you take well log to a _____ _______
synthetic seismogram
What are the three things that make up the basis of Seismic Interpretation?
well log to synthetic seismogram
correlation with seismic data
identify formation on seismic sections
Synthetic Seismogram can be summed up with what two processes?
convolve wavelet with reflectivity
approximate seismic data
Correlation of synthetic seismogram allows what two things?
correlate synthetic with real data
Identify the formations
Take a look slides 25-28
L6
what is placed on the surface to detect microseisms?
Receivers
where else can receivers be placed?
in the well
why are gravity and magnetics used during potential field exploration?
high resolution provides additional info – clear up ambiguity and adds confidence and provides information on Gross Features
Is earths magnetic field static?
No
what causes earths magnetic field?
by the geodynamo
rotation of solid inner core relative to outer core and convection in the liquid outer core
driven by heterogeneities in the mantle
which way does a compass point?
Magnetic North and it is currently at 14.42 degress to the east
how often do the magnetic poles flip? how long does it take
every 800-900MM yrs
1000yrs
magnetic declination curves
West - or +
East - or +
East + (Add)
West - (remove)
(Calgary MNP points 14.5 to the East)
micro seismic imaging allows you to do two things regarding when an event happens, what are they?
Detect when it happens and identify the location of the event
micro seismic allows for fault detection. true or false?
True
how does it detect these faults?
seepage along the faults
Detect Iron in the fault plane (magnetic effect detectable)
is Australia a magnetic anomaly?
Yes
what is the earths radius at the poles?
6357km
What is the earths radius at the Equator?
6378km
whats the difference in the radius of the poles vs equator?
21.3648484610118919636478486151846548km
is gravity higher at the poles or the equator?
at the poles – 9.832
at the equator – 9.780
is it the rotation or the shape of the earth that creates the difference in acceleration at the poles ?
the shape
true or false?
rotation of the earth decreases measured accel at the Poles
false
True or false?
Rotation of the earth increases the acceleration?
False. Rotation does not affect the acceleration
what is the bourguer correction?
gboug = 2(Pi)G(row)h
True or false?rugged terrain tends to reduce the gravity field at the surface of the earth.
True.
true or false.
tides affect the shape of the earth AND the a temporary affect on the observed gravity
True
true or false.
The affect is trivial
False
