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262 Reservoir geomechanics

True fast dip direction: 0°
90 90
0 75 75
True fast dip (deg) 60 True fast dip (deg) 60
45
45
30
30
15
0 15 0
−180 −90 0 90 180 0 15 30 45 60 75 90
Apparent fast azimuth (deg) Apparent fast dip (deg)

True fast dip direction: 90°
90 90
0 75 75
True fast dip (deg) 60 True fast dip (deg) 60
45
45
30
30
15
0 15 0
−180 −90 0 90 180 0 15 30 45 60 75 90
Apparent fast azimuth (deg) Apparent fast dip (deg)

True fast dip direction: 180°
90 90
0 75 75
True fast dip (deg) 60 True fast dip (deg) 60
45
45
30
30
15
0 15
0
−180 −90 0 90 180 0 15 30 45 60 75 90
Apparent fast azimuth (deg) Apparent fast dip (deg)
True fast dip direction: 270°
90 90
0 75 75
True fast dip (deg) 60 True fast dip (deg) 60
45
45
30
30
15
0 15 0
−180 −90 0 90 180 0 15 30 45 60 75 90
Apparent fast azimuth (deg) Apparent fast dip (deg)

◦
Figure 8.18. Model results for the arbitrary case of a borehole with an azimuth of 45 inclined at
◦
45 (shown as a triangle on the stereonets), for four true fast dip directions of 0 ,90 , 180 and
◦
◦
◦
◦
◦
270 ,ata full range of dips from 0–90 (shown as great circles) (after Boness and Zoback 2006).