Idiot Proof Well Log Analysis

idiot proofWell Log Analysis

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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:

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photo credit: Flickr of JD Hancock