Statfjord 3D 4C OBC survey

Question 1

Statfjord

What are the 2 possible OBC geometries?

Answer 1

parallel and orthogonal

Question 2

Statfjord

Specify when they are appropriate?

Answer 2

use parallel when you want to merge OBC data with towed steamer data (narrow azimuth)

use orthogonal when you want to improve illumination of complexe targets

Question 3

Statfjord

What is P/Z data ?

Answer 3

P/Z data is the vertical component of particle velocity recorded from geophone is scalled and summed with pressure from receiver side water layer reverberations (downgoing wave modes below sea level)

Question 4

Statfjord

What’s an advantage of true 3D acquisition geometry with full azimuth sampling

Answer 4

ability to decimate the data to emulate the different acquisition geometries, esp orthogonal shooting

Question 5

Statfjord

What 2 types of acquisition geometries are emulated through data decimation ?

Answer 5

orthogonal shooting emulates shot decimation

dense square source patch above coursely distributed receiver station (emulated by receiver decimation).

Question 6

Statfjord

Listric fault

Answer 6

curved normal faults in which the fault surface in concave upwards; its dip decreases with depth.

Question 7

Statfjord

EOR

Answer 7

Enhanced OIl Recovery

Question 8

Statfjord

MEOR

Answer 8

Microbial Enhanced Oil Recovery

Question 9

Statfjord

Shot Decimation

Answer 9

subset of shots are recorded

Question 10

Statfjord

Receiver Decimation

Answer 10

subset of receivers are used to acquire data

Question 11

Statfjord

Production Decimation

Answer 11

resampling subset

Question 12

Statfjord

Key Parameters for Spider Diagrams and Azimuth Distribution

Answer 12

Azimuth
Offset
Fold