AN 'OUT OF TOWN' ACR MD80 CREW TAXIES TO THE WRONG RWY AT ORD. NIGHT OP.

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CLRED TO 'CUT ACROSS THE PAD. CLRED FOR TKOF RWY 22L. TFC 7 OUT' (FOR RWY 27L). AS WE APCHED THE RWY; TWR CALLED; 'CANCEL TKOF CLRNC! YOU'RE ON THE WRONG RWY! YOU'RE ONE TXWY OFF.' THEN TWR CLRED US TO 'TURN R ON RWY 27L AND IMMEDIATE TURN AGAIN TO CLR. HOLD SHORT OF RWY 22L.' WE COMPLIED AND WERE THEN RECLRED FOR TKOF RWY 22L. I FIRST THOUGHT WE HAD SOMEHOW GOTTEN ONTO RWY 27L WITHOUT KNOWING; BUT STUDY OF THE ORD CHART SHOWED WE HAD APCHED RWY 22L ON TXWY Q INSTEAD OF TXWY D. WE DID NOT ENTER RWY 27L WITHOUT PERMISSION; BUT HAD TWR NOT CANCELED THE TKOF; WE WOULD HAVE TAKEN OFF RWY 22L AT TXWY Q; APPROX 700 FT REMAINING. WHILE THIS WOULD NOT HAVE BEEN UNSAFE FOR AN MD80; WE DID NOT HAVE A TPS FOR THAT INTXN. THE RWY 27L/22L/HOLDING PAD AREA IS CONFUSING AT BEST; HOWEVER I SHOULD HAVE REALIZED WE WERE NOT AT THE END OF RWY 22L; AND I WOULD HAVE AS SOON AS WE REACHED THE RWY. I SHOULD NOT HAVE ANGLED ACROSS THE PAD TO REACH RWY 22L. THIS WOULD HAVE PREVENTED ME FROM GETTING ON TXWY Q. ORD TWR INDICATED THERE WAS NO PROB AND NO CONFLICT. BUT THIS RPT IS BEING SUBMITTED AS A SAFETY ITEM. SUPPLEMENTAL INFO FROM ACN 356700: TWR TOLD US TO MAKE A R TURN ON RWY 27L AND ANOTHER R TURN ON TXWY D TO RWY 22L. AT NO TIME DID WE TAXI ONTO RWY 27L WITHOUT CLRNC.