M-OSRP Director Arthur Weglein - Annual Report, 2013

8/9/2019 M-OSRP Director Arthur Weglein - Annual Report, 2013

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M-OSRP TECHNICALSUMMARY 2013 SEG Annual Meeting

Tuesa!" Se#te$%e& 2'" 2013







O(e&all &esea&)* g+al,

To develop and deliver fundamental neective capability that addresses preo-shore and on-shore challenges --- wthese plays often involve complex me

with ill-dened subsurface properties





ISS for:• ! "ree surface multiple removal

• 2! Internal multiple removal

• #! $epth imaging

• %! &on-linear direct '()

• *! + compensation without +

'll have the same prere,uisites:

. /eference wave

2. $eghosting



'lgorithms to satisfy the prere,uisite

derived from 1reens theorem!

ISS and 1reens theorem provide dire

methodsthat do not re,uire subsurface inform



THE MULTIPLEATTENUATION TOOLO.

PROGRESS" CHALLENGEAN/ OPEN ISSUES

A&t*u& eglein

M-OSRPUH

M+na!" Se#te$%e& 23" 2013

Re)ent A(an)es an t*e R+a

A*ea



. /ecent progress 2. current outstanding challenges

#. a proposed road ahead with thepotential to address these challeng

Multi#le &e$+(al is a l+ngstaning+uts#&+%le$ in e#l+&ati+n seis$+l+g



In this tal4 we will:

. /ecogni5e and exemplify the progrethat has been made and the capab

that is currently available and deliv

Re)ent #&+g&ess



T*e )u&&ent )*allenge


2. /ecogni5e that current on-shore andcomplex o-shore plays increasingly

represent challenges with removingmultiples that go well beyond our entcollective industrys capability to eerespond to7 address6



A #&+#+se &es#+nse


#. 8ropose a three pronged technicalstrategy with the potential to addre

current gap between challenge andcapability!



4&ee su&5a)e an inte&nal $ulti#les

9ultiples that have experienced at least one downwar

reection at the air-water or air-land surface free surfcalled free surface multiples! 9ultiples that have all ofdownward reections below the free surface are calledmultiples!

The order of a free-surface multiple is dened as the numberreections it has experienced at the free surface; independennumber of downward reections in its history! In contrast; theinternal multiple is dened by the total number of downward has experienced < independent of the location of the downwa



Status

$istinct algorithms7methods have been developed that: . can eliminate free surface multiples of all orders6 2. can attenuate internal multiples of all orders!

'ttenuate means it reduces the amplitude but does neliminate. the multiples!

= and these algorithms do not re,uire . any information or 2. selecting a >phantom layer;? generators of the internal multiples are assumed to r#. are independent of earth model type!



Status

These methods do re,uire theyhave prere,uisites. :

. the direct wave referencewave. needs to be identied tond the source wavelet andradiation pattern

2. Source and receiverdeghosting



"or the free surface and internal multiple algoritreach their potential7deliver their promise; theseprere,uisites need to be satised

@nergy minimi5ation adaptive subtraction is ofte

upon to recogni5e7accommodate all dierences the prediction algorithm and its prere,uisites; another factors beyond the assumed physics. thatbe accommodated to eliminate the multiple!



9aAor issues in the last 2B-2* years:

. Industry trend to deep water; and

2. @xploration plays in ever more com

and ill-dened circumstances!



4&ee su&5a)e $ulti#le &e$+(a

Carvalho et al! DD2.



Inte&nal $ulti#le attenuati+n

'raEAo et al! DD%.



INTERNAL MULTIPLE REMO6AL

O44SHORE RA7IL SEISMIC /AUSING THE IN6ERSE SCATTERISERIES

Master ThesisMaster Thesis

An&e S 4e&&ei&a

A(is+&, /& A&t*u& eglein

An&e S 4e&&ei&a

A(is+&, /& A&t*u& eglein



Multi#le attenuati+n"ree surface multiple attenuation

9ultiple prediction

Shot gather

Corresponding multipleprediction

'! "er




Stac4 before free surface multiple removal

'! "er




Stac4 after free surface multiple removal



Multi#le attenuati+nInternal multiple attenuation

The internal multiple high computer cost proce



Multi#le attenuati+nInternal multiple attenuation

9ultiple prediction

Shot gather

Corresponding multipleprediction

Multi#le attenuati+n




Internal multiple attenuation results

Common oset sections






Common oset sections





Stac4ed sections






Stac4ed sections





Internal multiple attenuation results stac4ed secti


Multi#le attenuati+n '! "er





Multi#le attenuati+n '! "er





C+n)lusi+ns' "erreira et a



C+n)lusi+ns

9ultiple removal7attenuation is a maAor problem in exploration

"ree surface multiple removal results

9ultiple prediction is excellent

Improved when source wavelet information wprovided

'nti-alias lter application is important

9ultiples from #$ structures are attenuated butremoved

'daptive subtraction re,uired


9ultiple prediction is excellent

(ery high computer cost both C8F time and me

'! "erreira et a

C+n)lusi+ns' "erreira et a



ISS methods were able to attenuate both free surfinternal multiples in a very complex situation

&o a priori information about the dataset is nec&o other tested method was able to attenuate se,uence of internal multiples below the salt la

Gigh computer cost internal multiples.

'daptive subtraction re,uirement

C+n)lusi+ns'! "erreira et a



Lan a##li)ati+n +5 ISS inte&nal $u

>Their ISS internal multiple algorithm. perfo

was demonstrated with complex synthetic achallenging land eld datasets with encouraresults; where other internal multiple suppremethods were unable to demonstrate simila

eectiveness!?- Hi uo; 8anos 1! Jelamis; +iang "u; Shoudoand 1hada Sindi; Saudi 'ramco6 Shih-Hing G'rthur K! Leglein; F! of Gouston; >The inver

scattering series approach toward the elimin?



Cu&&ent )*allenges

The industry trend to more complediMcult on-shore and oshore play



These plays can often have proximainterfering primary and multiple eveand multiples of dierent ordersinterfering

That raises the bar on multiple remoeectiveness: to predict the amplituand phase of all orders of free surfainternal multiples



That challenge has returned multipl

elimination to center stage within 9 In principle; the ISS has subseries th

eliminate amplitude and phase pred

free surface and internal multiples=that capability; directly and withoutsubsurface information! The ISS is thmethod with that promise and poten



'll ISS subseries share a common set of

prere,uisites /eference wave removal $eghosting Source signature and radiation pattern identied

and utili5ed accommodated. in the algorithms

1reens theorem provides methods to achieve theprere,uisites that are consistent with the ISS metare meant to serve < in fact those prere,uisites arta4en in all derivations of ISS tas4 specic subser



$evelop a new adaptive criteria analgorithms that see4 to satisfy thatcriteria. that derive from and align ISS algorithms



Three pronged strategy Improve satisfaction of prere,uisites i

particular develop methods for on-sho Stronger algorithms eliminate interna

multiples of all orders. Consistent adaptive criteria and subse

prediction methods

"or o-shore and on-shore applicat

A t*&ee #&+nge $ulti#le attenu



A t*&ee #&+nge $ulti#le attenust&ateg!

! 8rovide methods from the Inverse Scattering Series ISS. t

the phase and amplitude of all orders of free surface and imultiples at all osets

2! 8rovide the prere,uisites; e!g!; the removal of the referencwaveeld; the wavelet; and deghosted data re,uired by IS

#! $evelop a replacement to the energy minimi5ation criteriaadaptive subtraction methods with a property that always by aligns with. the free surface and internal multiple algo

8re-re,uisiteLith d ith t h t



"S

LK

Dm

3mSource

#BBm

)ne reecting hori5ons6 source depth;3m6 receiver depth; Dm6 receiver

interval #m6 0B traces

Lith and without ghost

4 S 5 M lti l Eli i ti R lt it*



0.5

1.0

1.5

2.0

T i m e ( s )

500 1000 1500

Trace Number

0.5

1.0

1.5

2.0

T i m e ( s )

500 1000 1500

Trace Number

0.5

1.0

1.5

2.0

T i m e ( s )

500

Input data withghosts

$ata surfac

re

"ree-surface multipleprediction

4&ee Su&5a)e Multi#le Eli$inati+n Results it*G*+sts Re$+(e

Ninlong Hang; Nim 9ayhan 2B#.

4 S 5 M lti l Eli i ti R lt it*



0.5

1.0

1.5

2.0

T i m e ( s )

500 1000 1500

Trace Number

0.5

1.0

1.5

2.0

T i m e ( s )

500 1000 1500

Trace Number

0.5

1.0

1.5

2.0

T i m e ( s )

500

Input datawithout ghosts

Ninlong Hang; Nim 9ayhan 2B#.

"ree-surface multipleprediction

$ata surfac

re

4&ee Su&5a)e Multi#le Eli$inati+n Results it*Re$+(e

Synthetic model, constant velocity, invisible prim



RefleCoeff

Depth (m)

375

535 .45

.50

910 .8

y , y, p

Downward reflection poin

47

Synthetic shot



y

48

Synthetic shot after ghost and FS multiple rem



y g p

49













Identify the limitations in the lowest o

ISS internal multiple attenuator. 'ttenuate

2. Spurious events

@xtend that algorithm to remove thoselimitations!

M+el "rom attenuate to elimin



(O*BBm7s PO!Bg7cm#

(O3BBm7s PO!Qg7cm#

(O3BBm7s PO!Bg7cm#

(O#*BBm7s PO%!Bg7cm#

(O*BBBm7s PO%!Bg7cm# Hang

tenuation algorithm for internal multiples



I92# a

I9

8#

I922

P3 IM212 IM213 IM312 IM323

1

23

Hang

limination algorithm for internal multiples



I92# a

I9

8#

I922

P3

IM212

IM213

IM312

IM323

1

23

Hang



+ compensation without + Lith J! Innanen F! Calgary. and N!

8etrobras.





9a4e prediction algorithm stronger without subsurfac

dd i i di i



• 'ddressing spurious prediction

z0= 0 m

z1= 300 m

z2= 720 m

z3= 2200 m

ρ = 1.0 g/cm3; v = 1500 m/s

ρ = 1.6 g/cm3; v = 2500 m/s

ρ = 1.8 g/cm3; v = 1700 m/s

ρ = 3.0 g/cm3; v = 5000 m/s

ρ = 1.5 g/cm3; v = 2040 m/sz4= 2300 m

Water Bot

Top Salt

Base Salt

Target

Test model

9a4e prediction algorithm strong without subsurface

'dd i i di ti



• 'ddressing spurious prediction

Synthetic data


'dd i i di ti ith t hi h d



• 'ddressing spurious prediction without higher-orderterm.

Synthetic data and leading-order predictionresults


'dd i i di ti ith th hi h d



• 'ddressing spurious prediction with the higher-orderterm.

Synthetic data and leading-order and higher-order prediction results

• Lell log data before bloc4ing. data courtesy of J)C.



(elocity

$ensity

• Lell log data after bloc4ing. data courtesy of J)C.



(elocity

$ensity

Comparison among reference internal multiple blue.; leadinprediction without red. and with green. higher-order term

courtesy of J)C



courtesy of J)C

'c4nowledgements



• J)C @xploration71eosolution for permissiouse their well log data in studies on the IS

method6• J)C and L17SK management for permis

to cite the results of the study6• 9-)S/8 student Chao 9a for carrying out

study; during internship at L17SK inGouston!

g









• cBO*BB correct.

• 8B

0 0( , , ) ( ) ( , , )

s s

P r r A G r r ω ω ω =

r r r r



• cBO%DB wrong.

• 8B

0 0

( , , ) ( ) ( , , ) s s


r r r r



• cBO%*B wrong.

• 8B

0 0

( , , ) ( ) ( , , ) s s


r r r r

Lavelet estimationusing dierent reference velocities



using dierent reference velocities

*BB%*B %DB

Angle in(a&ian)e U

a(e t*e+&! RTM

























M-OSRP te)*ni)al #&esentati+ns2013 SEG Inte&nati+nal C+n5e&en

C+n(enti+n an #+st )+n(en



C+n(enti+n" an #+st-)+n(en+&;s*+#s

M+na!" Se#te$%e& 23" ',28 PM 'rthur K! Leglein on >Multiple attenuation: Recent adva

the road ahead (2013).” SS 2: /ecent 'dvances and the /oad 'head session!

Tuesa!" Se#te$%e& 2'" 2,10 PM in Tang on “Using Greens theore! to satis"# data re$u

o" !ultiple re!oval !ethods: %he i!pact o" ac$uisition Co-'uthor: Names $! 9ayhan; Ninlong Hang and 'rthur K! S8&' 8: $eghosting and 1round-/oll /emoval! ocatio





enesa!" Se#te$%e& 28" 2013 at <,'0 AM Gong iang on WGeneral theor# "or acco!!odating pri!aries and

internal !ultiple algorith!: &nal#sis and nu!erical tests.' Co-'uthor: Chao 9a and 'rthur K! Leglein! S89F 8: 9ethods for 9ultiples session! ocation: K!

enesa!" Se#te$%e& 28" 2013 at 10,00 AM Ninlong Hang on W &cco!!odating the source (and receiver) arra#

sur"ace !ultiple eli!ination algorith!: !pact on inter"ering or pr pri!aries and !ultiples.W

Co-'uthor: Names $! 9ayhan; in Tang and 'rthur K! Leglein! S89F 8: 9ethods for 9ultiples session! ocation: C!






enesa!" Se#te$%e& 28" 2013 at 1,30 PM Lilberth Gerrera on “+li!inating ,rstorder internal !ultiples -i

reection at the shallo-est inter"ace: %heor# and initial e*a!ple Co-'uthor: 'rthur K! Leglein! S89F @-8: 9ethods for 9ultiples session; at @-8oster Station: %

enesa!" Se#te$%e& 28" 2013 at 1,80 PM Hanglei Rou on '& ne- !ethod to eli!inate ,rstorder internal !

nor!al incidence plane -ave on a 1/ earth.' Co-'uthor: 'rthur K! Leglein! S89F @-8: 9ethods for 9ultiples session; at @-8oster Station: %






enesa!" Se#te$%e& 28" 2013 at 3,30 PM

Gichem 'yadi on >%i!e saving !ethod ased on angular $uaapplied to an internal !ultiple attenuation algorith!: unda!concept develop!ent and nu!erical anal#sis.”

Co-'uthor: 'rthur K! Leglein! S89F @-8: 9ethods for 9ultiples session; at @-8oster Statio

#%2 '!

SEG #+st )+n(enti+n +&;s*+# +n Inte&nal Multi#les T*u&sa! Se#te$%e& 2=" 2013 1,30-8 #$ 'rthur K! Leglein >' three pronged strategy to address the cu

pressing internal multiple challenges for o-shore and on-sho L-3: Tools and 9ethods for Internal 9ultiple @limination: /ece


/ecent 'dvances and the /oad 'h2B#.



2B#.Summary

• 's with seismic imaging and inversion <

today there is much to celebrate6 muchfundamental wor4 yet to be done!

• Le have demonstrated recent progress propose a three pronged strategy for the

road ahead!• "or on-shore internal multiple eliminatio

that strategy will re,uire new ideas;concepts; and capability!

Nea& Te&$ Multi#le St&ateg



$evelop and deliver the three pronged

strategy for complex marine o-shoremultiple elimination while the theory amethods for on-shore prere,uisites aredeveloped and evaluated!

O(e&all Su$$a&!



'll proAects are showing reasonable7go

progress and delivery!



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M-OSRP Director Arthur Weglein - Annual Report, 2013