idiot proof well log analysis - d2vvqscadf4c1f.cloudfront.net · gamma ray on the left track...
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idiot proofWell Log Analysis
for more info, visitsuperpetrophysics.com
we make learning petrophysics simple, quick & fun.
our mantra is
log analysis
DAMNhard!
shouldn’t be so
3you can INTERPRET A WELL log IN
EASY STEPS that are
to followeasy fun to readquick to do
what you need are: your logic
your common sense
ready? Are you
begin.. let’s
the rule is simple…
left, right, left
1. conventional reservoir 2. water based mud 3. saline formation water 4. conventional log scales / headers
THIS will work in
Gamma Ray on the left track Resistivity on the middle track Porosity on the right track
in a well log, you need 3 curves
it looks like this
by convention, as we go from
left >>>>> right
GR Increases
RESISTIVITY increases POROSITY decreases
left >>>>> right
Gamma Raystep 1
deflects to the ..if gr
the zone is clean.
reservoir quality rock
left <<<<<
might be shale.
not reservoir quality rock
>>>>> right
like this:
Resistivitystep 2
deflects to the ..if resistivity
low resistivity.
water or shale
left <<<<<
higher resistivity
oil/gas fresh water
low porosity
>>>>> right
like this:
Porositystep 3
deflects to the ..if porosity
higher porosity
clean & porous.
left <<<<<
lower porosity
poor or tight rock
>>>>> right
like this:
Gamma Ray <<<<< Resistivity >>>>> Porosity <<<<<
so we want clean + high resisitivity + porous
GR DEFLECTS TO THE Left
RESISTIVITY GOES TO THE RIGHT
POROSITY MOVES TO THE LEFT
in an oil bearing zone:
we make learning petrophysics simple, quick &
fun. SUPERPETROPHYSICS.COM
photo credit: Flickr of JD Hancock