(1)	$\begin{array}{l}\displaystyle k_h = \sqrt{k_x^2+k_y^2}\end{array}$

(2)	$\begin{array}{l}\displaystyle k_x = k_h \cdot \cos \alpha\end{array}$

(3)	$\begin{array}{l}\displaystyle k_x = k_h \cdot \sin \alpha\end{array}$

(4)	$\begin{array}{l}\displaystyle \tan \alpha = \frac{k_y}{k_x}\end{array}$

For laterally isotropic reservoir :

(5)	$\begin{array}{l}\displaystyle \tan \alpha = 1 \quad \Leftrightarrow \quad k_h = k_x = k_y\end{array}$

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See also