Page 258 - Origin and Prediction of Abnormal Formation Pressures

230 H.H. RIEKE, G.V. CHILINGAR AND J.O. ROBERTSON JR

(a)

REGIONAL BASIN BASEMENT
,3o
Z ~u.l r STRESS AREAL SHAPE PROFILE
tu O
I- ..J (ArealSize)
ON UJ
r162 O (..)
O < O
.~ L . . ...
Extensional Circular to Elongate Symmetrical
Sag ( Large )

2. Compression Elongate to Circular Asymmetrical
1. Extension ? ( Large to Moderate

2. Sag Random Symmetrically
1. Extension ( Large to Moderate ) Irregular

~ P" Z
~ O 2. Compression Elongate Asymmetrical
.~ ~ , Exteo.,o,,, (Large)
z o
o o

1. Extension Elongate irregular
( Narrow Fault
( Local wrench controlled )
compression )
( Small to Moderate )
~- "z
z o
~ ~ n P" 1. Extenlion Elongate Irregular
plus
~ ~ 2. Wranch (Small)
~' Z compression
'p.

0 ~ ~ Elongate Asymmetrically
-~ " dl4'1 ~ ( Small to Moderate ) Irregular

~_ _z
Z ~ A. Extensional Circular to Elongate Depocenter
IJJ "O tv- Sag
Z I~ ,r ( Moderate )
p n;
Z~ Z
O
,,=,~ == Compression Elongate Asymmetrical
and
(?)
>~ =~ Extension
8 8
Fig. 10-3.