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