Transcript Document

Proving ADAPS via honest results.
No well data is input! The well images you see here
were super-imposed after the runs were made. The ability
to match well results is the best test for any tool that is
pretending to improve resolution. I present these great
examples as my answer to those seeking mathematical
proof.
To appreciate what has been accomplished, one
must compare the “before and after” . In these examples I
match each final result with the best the owner had been
able to do using state of the art processing..
The B&A at the right
comes from a
different shale play. I was happy with the
way the system matched the log below the
arrow (thickness wise). However the upper
section provides great examples of what I
said about the re-assembly of the input lobes,
reducing the number and greatly improving
the well match.
pay close attention to the circled zone.
One should not have to go further for proof on
the the “simulation of a sonic log” (that I tout
constantly) is important.
Dominant events that were probably mapped
completely change character as a result of the powerful
detuning. This is illustrated by the shale play to the right
where significant changes are verified by excellent well
matches. This is the essence of the ADAPS argument.
The best possible answer under the conditions that
exist is the goal of all optimization software. In the case of
ADAPS we set out to explain the energy on the individual
traces using all our seismic knowhow. I am the first to say
that these matches are not always perfect. However most
make me smile.
You are looking at seismic
simulations of sonic logs,
the ideal for stratigraphic
interpretation.
The ADAPS de-tuning is a two part thing. First, it
does a superb job of simulating the reflection coefficients
(spikes to us). However, once done, these interfaces are
often hard to map, since even when the beds extend for
miles, the individual spikes may come and go.
ADAPS goes one step farther by integrating the
spikes to simulate actual lithology. please note that
on all the examples there are more events showing on the input
than on our output. In other words the system has completely rearranged the input energy bands according to it’s idea of true
lithology. Please take time to examine the improvement, lobe by
lobe.
A solution looking for the right problems – I have
yet to see the prospect where the ADAPS results weren’t
an improvement. Of course when the structure is boring
the differences might not seem worth the effort. The really
exciting cases are where this ultimate de-tuning brings out
structural details and reservoir possibilities that otherwise
might be missed. One of these is discussed two slides
later.
What I am looking for – I have
already sold the proprietary rites to my non-linear
inversion to Ikon Science. They have published an
early version as NLI. However, I retained the right
to use my work on a consulting and service basis.
Each of the projects I have worked on has posed unique
challenges. The non-linear ADAPS approach allows me to get
my arms around noise problems, generally on a pre-stack
basis. My current goal is to establish consulting relations with
a few independent companies that have data I can improve.
Click on “do it yourself” to return to the ADAPS base or
elsewhere to continue with these examples.
Shale play and seismicBecause of the general fracturing approach, the
role for seismic resolution seems diminished. Even
though ADAPS has been able to sharply define the
lithology and thicknesses of the two deep events,
variations in the overlying organic shale are also
of great interest. Resolution is even more key here,
and while there is a lot of improvement, more
needs to be done.
Unfortunately, even if we do a perfect job,
current automated interpretation systems are not
up to the task of translating subtle stratigraphic
changes into map form, at least in complex areas.
In the ADAPS view, there may still be a place for
time slices and other currently popular tools, but
only after human evaluation of multi-dimensional
results (using old-fashioned visual interpretation).
Back to simulated sonic logs!
The best the client
could do – The
T
unadulterated input stack.
What I want to show
in these next two slides is how
ADAPS uncovered a major lensing phenomenon. While there
are traces of it on this input, you will see the major difference detuning can make in interpretation when you toggle to the next
slide.
But before you go forgive another lecture on well matches.
Too often interpreters look right past the fine detail, just noticing
when major things more or less line up, regardless of polarity.
The reason this is so important is that these
matches supply proof of the ADAPS inversion
and sonic log integration. Since so many lobes
are removed by the process, final matches are
crucial to industry acceptance.
On this input match, most matching lobes are just
randomly misplaced, while many show opposite polarity.
Those to the right should match with blue events of course.
On the finished product you will see remarkable agreement.
Please take the time to study this by toggling.
This is the lensing area mentioned. It is
around the target, so the phenomenon is most
important to reservoir evaluation. When I first
began the study I was convinced there was
faulting. Now we will see that ADAPS de-tuning
straightened out the complex overlap.
Toggle please
ADAPS inverted & integrated output.
Now look at the well match!
To sell the merits of de-tuning, one has to find an example where
it makes a profound stratigraphic difference. This is one of those
finds. While I want you to study the fairly remarkable well match
before you leave, first pay attention to the stratigraphic pinchout
now evident below.
A personal vignette – Back in the 50’s, when I was
an interpreter for Mobil, I had an offset being drilled
on my say so. We were shooting some work to check
my interpretation and the paper results were drying in
a locked partition. To see them I scaled the wall.
Today, I wonder how many still feel the excitement
that still drives me in my efforts. The beauty of this
well match set me off.
And back
Before
After
Another case where ADAPS made lobes point in the right direction.
But also notice the enhanced strike slip fault evidence.
Such faulting is discussed in the Nexen show reachable
from the ADAPS base.
Please note the minute well match details,
including the polarity flip-flops.
A “post stack” example where
parameters were tailored
to Vibroseis input.
Here I show the results first. Again note the
remarkable well match.
Please toggle with straight
stack input.
The question is: How could anyone have been
satisfied with this match?
Rocky mountain (post stack) inversion and integration, line Y
Rocky mountain (post stack) stacked input, line Y
Please toggle w results
Of course the display does make a difference.
We only use the two basic colors in the ADAPS output. If you go to our section on direct reservoir detection you
will see that the bright red being touted as a hydrocarbon indicator. We are careful to adjust the amplitudes so as not to jam. I am sure the complex color scheme at the left is very meaningful in North
Sea work, but it offends my own eye. We are back in the Nexen work here, and the first section was presented to introduce me to the problem. The section to the right is the ADAPS output. While it
leaves something to be desired, it does seem to beat the hell out of what we started with.
The blue event towards the top of the well log is a marker shale we followed all around the prospect We think the correlation across the strike slip vertical fault is as shown. You will
see that this is in direct opposition to what the original data showed..
The fact that I could not get Nexen excited about this comparison still blows my mind.
Another final with good well match -
And still another – (we could go on).
adaps.com will get you here in the
future – mark it.
The end
Or here for router