Name

“Andersonian” stress state (MPa)

Transformed stress state, aligned with a local coordinate system which is aligned with the wellbore axis (MPa)


Tectonics

σ
_{v}

σ
_{H}

σ
_{h}

σ
_{ss}

σ
_{dd}

τ
_{sd}


Case A

Intermediary normal/strikeslip fault (σ_{v} = σ_{H} = σ_{1})

134

134

60

125

85

21

Case B

Normal fault—“low” horizontal isotropic stress (σ_{v} = σ_{1})

134

60

60

60

79

0

Case C

Strikeslip fault (σ_{H} = σ_{1} and σ_{v} = σ_{2})

134

180

60

166

89

33

Case D

Normal fault—“high” horizontal isotropic stress (σ_{v} = σ_{1})

134

80

80

80

94

0

 The stress magnitudes are given in 3D in the vertical/horizontal system (here assumed to be the principal stress state) and their components in the 2D plane perpendicular to the wellbore axis (obtained by a linear transform, see Fig. 5). σ_{1}: major principal stress, σ_{2}: intermediate principal stress. σ_{v}: vertical stress, σ_{H}: maximum horizontal stress, σ_{h}: minimum horizontal stress, σ_{dd}: stress component in dip direction of the 2D plan, σ_{ss}: stress component in strike direction of the 2D plan, τ_{sd}: tangential shear stress component in the plane perpendicular to the well