PETROG

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PETROG

• The best tool for digital petrography
• data collection, management, analysis,
  presentation and sharing

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Core material is retrieved at great expense. It
is needed both because we want to see for
ourselves (i.e. ground-truth) that which
otherwise we can only infer indirectly (by
petrophysical logging, seismic survey, etc.) and
because there are some things which can only be
seen directly.Petrographic analysis is
generally the only time a geologist looks at the
rock to determine its composition. If we are only
going to look at the rock once, we must do it
right first time.
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Looking down a microscope
Under the cross hair we see booky kaolinite
filling a grain mouldic pore created by the
dissolution of plagioclase feldspar. In a
traditional petrographic report the reader would
see only an image and possibly some small data
parameters. In Petrog the image is connected to
the description and to the exact point on the
slide - and this is true for every point
described on the slide.
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How much of this information would be captured by
a petrographer using a 20-channel point
counter?20 channels means that everything that
can be said about the entire slide has to be one
of 20 different pre-determined categories.If we
have 5 different grains on the slide and 4
different clay overgrowths, thats 20 already,
and we havent begun to consider clay habit, let
alone porosity, ..
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PETROG provides the ability to describe each
point in one of hundreds of millions of different
ways with an average of only 3 - 4 clicks of the
mouse, in a matter of a few seconds.
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In this case a point on this slide could be
described as

• 1st Click Authigenic Kaolinite Group

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2nd Click Platy Books3rd Click Cementing
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4th Click Grain Mouldic porosity5th Click
Filling pore6th Click pore formed from
dissolution of
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7th Click Plagioclase detrital mineral
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So what did we see at the data point (everything
else is not relevant in a sampling based
procedure) Authigenic kaolinite with a booky
growth form filling a grain mouldic pore which
was formed by the dissolution of plagioclase
feldspar So we now have 3 elements involved in a
diagenetic sequence with their relationships
recorded.
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• A sequence of 7 quick clicks gives us
• Mineralogy of the data point under the cross hair
• Morphological growth form(s) of the mineral
• Relationship habits of this mineral to the
  adjacent rock elements
• Sequence of diagenetic events at this point

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. and all data is immediately stored digitally
and in a hierarchical form. This means that the
petrographer can describe ALL of what s/he sees
at the sampling point on the slide, not have to
second-guess how the data will later be used and
structure his limited data collection system to
capture only those relevant data elements.
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All data arranged hierarchically
Because the data are stored hierarchically in the
PETROG database, the petrographer is free to log
and describe exactly what s/he sees, knowing that
the analyst or any subsequent user can see more
detail or a summary as the context requires. For
example, Allophane will be included in any
report of Clay Minerals the sum of all silicate
materials will include Sheet Silicates,
Double-Chain Silicates, etc. the petrographer is
not forced to describe the rock in terms which
will be expected in the report.
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The petrographer is more comfortable, looking at
the monitor instead of changing eye focus
repeatedly, so s/he can capture MORE DATA FASTER!
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and once the data collection is complete,
analysis is quick and simple, including all the
tools one would expect, such as ternary plots
as both interactive exploratory or analytical
tools on screen and high quality reporting tools
for printing hard copy or creating digital
displays.
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and analyses which make full use of the
additional data collected, to estimate original
mineralogy, analyse microporosity, compare with
other available numerical data sources (such as
core analysis and XRD) and many more interactive
analyses or hard copy displays, which have
hitherto not been possible in any repeatable,
quantitative way.
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PETROG

• The best tool for digital petrography
• data collection, management, analysis,
  presentation and sharing.

www.petrog.com