documentclass[border=2mm,tikz]{standalone}
usepackage{tikz}
usetikzlibrary{arrows.meta,calc,intersections}

begin{document}

begin{tikzpicture}

draw[->] (-3,0,0) -- (3,0,0) node[below right] {$x$};
draw[->] (0,-3,0) -- (0,3,0) node[above right] {$y$};
draw[->] (0,0,-3) -- (0,0,3) node[below right] {$z$};

coordinate (o) at (0,0,0);
coordinate (a) at (3.1,0,1.2);

draw[dashed] (a) -- (o);

path (a) -- coordinate[pos=0.32] (b) (o);

draw [thick,-{Straight Barb},orange] (a) -- ($(a)!1.2cm!90:(o)$) coordinate[label={[black]above left:c}] (c);
draw[thick,-{Straight Barb},gray] (a) -- node[pos=0.7, below=0.35em] {b} (b);
draw [thick,-{Straight Barb},red] (a) -- ([shift={(0,1.5,0)}]a) coordinate[label={[black]above right:d}] (d);

fill[blue!50,opacity=0.6] (c) rectangle (d);

end{tikzpicture}

end{document}