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PENGOLAHAN DATA SEISMIK

By : Ardian Novianto

STRIPPING:

TG= - U + TS

ELVS - D - ELVB

VNS

TS = - and

Where VNS = kecepatan rata-rata dari bottom lubang ke base horizon

U = pengukuran uphole time

D = kedalaman shot

ELVDAT - ELVB

VRTR = + *2REPLACEMENT:

T = TS+ TG+ TRTOTAL:

Where VR= Kecepatan pengganti

(replacement velocity)

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PENGOLAHAN DATA SEISMIK

By : Ardian Novianto

Quis

-

-

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PENGOLAHAN DATA SEISMIK

By : Ardian Novianto

LOCATION UHT SHOT TO

DATUM TIME

SURFACE TO

DATUM TIME

A 0.024 0.008 Sec 0.032 Sec

B 0.030 0.005 Sec 0.035 Sec

C 0.036

D 0.022

E 0.014

A 135B 110

C 95D 65

E 20

0.024

0.0300.036

0.022

0.014LVL

Surface Elevation

7270 80

6560 shot Depth

LVL

DATUM

SEA LEVEL

Shot Location Geophone

location

Static Corrections

B A - (0.005 + 0.032) = - 0.037

C A - (0.002 + 0.032) = ?

D B

E C

E D

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PENGOLAHAN DATA SEISMIK

By : Ardian Novianto

1. Perhitungan Shot to datum Time :

Shot to Datum Time = Elevation Shot depth

Datum Velocity

Diketahui besarnya Datum Velocity = 8000/sec.

- Titik A : Shot To Datum time = 135 72

8000

= 0.0079 Sec- Titik B : Shot To Datum time = 110 70

8000

= 0.005 Sec

2. Perhitungan Surface to datum Time :

Surface to datum Time = UHT + Shot to Datum Time

- Titik A : 0.024 + 0.008 = 0.032 Sec

- Titik B : 0.030 + 0.005 = 0.035 Sec

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PENGOLAHAN DATA SEISMIK

By : Ardian Novianto

3. Perhitungan Static Corecctions

Static Correction = - (Shot to Datum Time + Surface to Datum Time)

Tanda Minus disini merupakan koreksi terhadap posisi datumnya dengan asumsi

bahwa terdapat kelebihan waktu diatas posisi datum sehingga harus dikurangkan.

- Shot Location B dan Geophone Location A

= - (Shot to Datum Time B + Surface to Datum Time A)

= - (0.005 + 0.032)

= - 0.037 Sec

- Shot Location C dan Geophone Location A

= - (Shot to Datum Time C + Surface to Datum Time A)

= ??