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How to cross plot data directly
from a seismic display
HRS-9/R2
December 2013
Brian Russell
Introduction
 This presentation shows several new features in the
Hampson-Russell cross plot program as implemented in
HRS-9/R2.
 The objective of these new features is twofold:
 To make selecting a zone for cross-plotting both
interactive and moveable throughout the data volume.
 To create multiple cross-plot zones from the data.
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The Colony dataset
 We will use the Colony dataset to illustrate the new features.
 Above, we display the intercept*gradient (A*B) result.
 Although this data set is 2D, the option works equally well on 3D data.
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Section Zones
To create “Section Zones” (zones picked on the seismic section), select the
View > Create Section Zones option as shown above.
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Section Zones
 The Section
Zone Set Menu
appears below
the seismic plot.
 We have
removed the
Project Manager
to reduce the
screen clutter.
 Click Section
Zone Set to
create a New
Zone Set or
Delete an old
Zone Set.
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Section Zones
 The first Zone Set
is called Set_1 by
default.
 Select the
rectangular drawing
object, which
defaults the zone
name to Zone_1.
 Then draw the red
rectangle around
what is interpreted
as the gas zone, as
shown here.
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Cross plotting section zones
 Select Show Cross
Plot Control to get
the cross plot menu.
 Then select Feature
Group Only to get a
list of groups, and
select avo(A,B).
 Finally, select Launch
Cross Plot to bring
up the cross plot
display.
 Note that for 3D
datasets, Inline/Xline
Thickness lets you
select a 3D “box” of
data to display.
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Cross plotting section zones
 Here is the cross
plot associated with
our first section
zone, with the points
colored red.
 As expected, this
zone appears to
show the fluid
anomaly, as it is
aligned in a +90
degree direction.
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A second section zone
 Select the
rectangular
drawing object
again and create
a second zone
with the default
name Zone_2.
 Draw the cyan
rectangle around
what should be
the wet zone, as
shown.
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The resulting cross plot
 Here is the cross plot
associated with the
two section zones,
with the points
colored red or cyan.
 As expected, the
second zone appears
to be wet, as it is
aligned in a -90
degree direction.
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Moving a cross section zone
 Once you create a
zone, you can move
and re-size it around
the volume, and the
resulting points on
the cross plot will
update automatically.
 For example, here we
move Zone_1 from a
gas zone to a
different wet zone
and made it smaller
(the dashed box is
drawn for effect!)
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The updated cross plot
 Here is the new
cross plot display.
 Note that now both
the red and cyan
clusters are trending
in a -90 degree
direction, indicating
that they are wet.
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Adding a third section zone
 You can add as many
zones as you want.
 For example, here we
have created a third
zone, called Zone_3
and colored yellow.
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The updated cross plot
 Here is the resulting
cross plot, showing
the points from all
three zones.
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Cross plotting different attribute pairs
 So far we have used only
an AVO intercept versus
gradient crossplot.
 But the approach can be
applied to a cross plot of
any two derived attributes.
 For example, here we use
the Range Limited Stack
option to compute 0-15
and 15-30° angle stacks,
and display the first stack.
 Using the same zones, we
will crossplot far stack
against near stack.
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The updated cross plot
 Here is the resulting
cross plot, showing
the points from all
three zones.
 But now the
crossplot is far stack
(range_limit_stack2)
versus near stack
(range_limit_stack1).
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The cross plot zone option
 Note that we can still use the
Cross Plot Zone option.
 For example, here are two
cross plot zones: a blue ellipse
that has been guided by the wet
zone points and a red rectangle
that has been guided by some
gas zone points.
 The regions enclosed by these
zones can be plotted back on
the seismic by using Cross Plot
for the Color Data Volume.
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Further points
 The objective of these new features is twofold:
 To make the selection of a cross plot zone both
interactive and moveable through the data volume.
 To allow multiple zones to be created from the data
volume.
 While we have applied the new Section Zones to an AVO
intercept versus gradient crossplot, such zones could also
be applied to any two derived attributes, such as VP/VS ratio
versus P-impedance, or λρ versus µρ.
 These options in the cross plot tool give a very powerful
interpretative tool for the petroleum geoscientist.
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Support Offices
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