Disable Shift Cmd Q for logout

I would like to disable Shift+Command+Q keyboard shortcut for Log Out.

I am using Karabiner at the moment, but I only managed to disable it completely using the following xml:

<?xml version="1.0"?>
<root>
    <item>
        <name>Disable COMMAND SHIFT Q for Logout</name>
        <identifier>disable_CMD_SHIFT_Q_private</identifier>
        <autogen>__KeyToKey__ KeyCode::Q, VK_SHIFT | VK_COMMAND | ModifierFlag::NONE, KeyCode::VK_NONE</autogen>
    </item>
</root>

but I would like to have the keyboard combination available in emacs (in ESS for debugging).

Is there some way that I can effectively unmap the keyboard combination?

The following works for me on 10.9.5:

1. System Preferences > Keyboard > Shortcuts > App Shortcuts.
2. '+' to add a shortcut
3. Application: All Applications
4. Menu Title: Log Out [Your Name]… Here, copy the exact text shown in the Apple menu, replacing [Your Name], and note that the ellipsis … must be typed with alt-;
5. Keyboard Shortcut: ctrl-shift-cmd-Q (or whatever you prefer: something different to shift-cmd-Q)
6. Log out and in again.
7. Note that the keyboard shortcut has changed in the Apple menu, and shift-cmd-Q no longer triggers the menu.