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Seismic Data Processing

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(1)
(2)

Pre - Processing Flow

SEGY Input, Resampling Geometry

Geometry Assignment Spectral Analysis BPF, Low Freq. Filtering

TAR & AGC 1st STACK

(Brute Stack) Autocorrelation

Velan after DBS NMO Correction Muting DAS DBS NMO Correction Muting Velan 1 Stacking Field Report Observer Report SPS File

(3)

Main Processing Flow

DMO STACK

Velan for PSDM Post Stack MIG PSTM

PSTM Stacking

Radon Demultiple Radon Stacking F-K Demultiple F-K Stacking Decon CDP Gather Filtering Filtering Velan for PSTM PSDM PSDM Stacking Filtering

(4)

“Segala sesuatu tidaklah sesulit yang kita

lihat, segala sesuatu lebih menguntungkan

daripada yang diduga, dan jika ada

kemungkinan berhasil, maka hal itu akan

benar-benar terjadi dan pada saat yang

terbaik”

(5)

-2D Marine Geometry

Auto-2D and Geometry Setup

(6)

2D Marine Geometry

SIN OPF

(7)

2D Marine Geometry

PAT OPF

(8)

2D Marine Geometry

Binning

(9)

2D Marine Geometry

TRC OPF

(10)
(11)

Shot Gather with Trace Length (3500)

(12)

True Amplitude Recovery (TAR)

Geometric Spreading Correction

Low Freq Noise decreased Direct Wave -- GONE Amplitude -- Recovered

(13)
(14)
(15)
(16)

Shot Gather After AGC

(17)

Top Mute /Low Cut

(18)
(19)

Bandpass Filter

(20)

Deconvolution

(21)
(22)
(23)

“Kemampuan Anda mengembangkan orang lain

merupakan cara bagi Anda untuk maju ke

depan. Cara terbaik untuk maju ke depan

adalah mengajarkan kepada orang lain untuk

maju ke depan”

(24)

David-CDP Gather Pre Process Before Decon

(25)

CDP Gather Pre Process After Decon

(26)

Spectral Analysis

(27)

Spectral Analysis

(28)

Spectral Analysis

(29)
(30)

Velocity Analysis I Editor

(31)

Velocity Analysis I Editor

(32)

CDP gather with NMO(Vel 1)

(33)
(34)

Stack After Deconvolution Brute Stack

Water bottom Multiple (near) -- GONE

(35)
(36)

“Optimisme yang sesungguhnya adalah

menyadari adanya masalah tetapi mengenali

pemecahannya, mengetahui adanya kesulitan

tetapi yakin bahwa itu dapat diatasi, melihat

yang negatif tetapi menekankan yang positif,

menghadapi yang terburuk tetapi mengharap

yang terbaik, punya alasan untuk mengeluh

tetapi memilih untuk tersenyum”

(37)
(38)
(39)
(40)

Stack

(41)
(42)

Velocity Analysis II Editor

(43)

Velocity Analysis II Editor

(44)
(45)
(46)
(47)

Stack

(48)
(49)
(50)
(51)

CDP gather 5000

(52)

CDP gather 5250

CDP gather Pre-Process CDP gather with NMO (Vel I)

CDP gather with NMO (Vel I) Radon I

CDP gather with NMO (Vel 2) Radon I

CDP gather with NMO (Vel II) Radon II

(53)

CDP gather 5500

(54)

CDP gather 5750

CDP gather Pre-Process CDP gather with NMO (Vel I)

CDP gather with NMO (Vel I) Radon I

CDP gather with NMO (Vel 2) Radon I

CDP gather with NMO (Vel II) Radon II

(55)

CDP gather 6000

(56)
(57)

Stack

(58)

Stack

(59)

Stack

(60)

“Kalau Anda tidak menyadari siapa diri Anda

dan di mana Anda berada sekarang, jangan

meresahkannya karena Anda tidak harus

terikat dengan siapa diri Anda atau dimana

Anda berada sekarang. Anda bisa tambah,

Anda bisa berubah, Anda bisa lebih dari diri

Anda sekarang”

(61)

-Post Stack Time Migration

Using Reverse Time T-K Migration

(62)

Post Stack Time Migration

Using Implicit FD Time Migration

(63)

Post Stack Depth Migration

Using Implicit FD Depth Migration

(64)

Post Stack Time Migration

Using Fast Explicit FD Time Migration

(65)

Post Stack Time Migration

Using Steep Dip Explicit FD Time Migration

(66)

Post Stack Depth Migration

Using Explicit FD Depth Migration

(67)
(68)

Post Stack Time Migration

Using Stolt 2D F-K Migration

(69)

Post Stack Time Migration

Using Phase Shift 2D Migration

(70)

Post Stack Time Migration

(71)

Post Stack Depth Migration

(72)

“Berpikir secara baik berarti membiarkan

otak bekerja secara fleksibel. Jangan

biarkan proses berpikir Anda menjadi kaku,

karena itu akan menyulitkan Anda untuk

berpikir secara lain”

(73)
(74)

Pre Stack Kirchhoff Time Migration (PSTM) PSTM Gather

(75)
(76)
(77)

Pre Stack Kirchhoff Depth Migration (PSDM) PSDM Gather

(78)
(79)

Conclusion

• Problems to data: poor quality due to low S/N ratio, can only cover reflections until

~3000 ms

• Gain recovery is necessary to bring up the amplitude decay at late travel time due to

attenuation of earth layer and geometrical spreading of expanding waveform.

• Noises are: Low frequency noise (below 2 Hz), water bottom multiple, direct wave,

reverberations, and diffractions.

• Predictive decon gives reliable solutions to reduce reverberations, help reduce short

period multiple but fail to reduce long period multiple

• Velocity analysis gives a good estimation of RMS velocity for NMO correction;

looking at the result, velocity is increasing with depth, with small lateral variation

(80)

Noises on 2D Marine Data

Direct wave Low frequency Noise Diffraction Multiples Unmigrated reflector

(81)

“Jalan yang kita lewati mungkin

berbeda-beda, tetapi yakinlah dengan jalan yang kita

lewati itu, kelak pasti akan memberi manfaat

buat kita. Tetapi tidak menutup kemungkinan

jika jalan yang kita lewati bercabang dan

memberi banyak pilihan buat kita, mau pilih

References

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