UNAUTH TKOF ON CLOSED RWY PERFORMED BY PVT PLT ON XCOUNTRY.

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APCHING ARPT FROM N; NO TFC; STRAIGHT-IN APCH RWY 17 WITH L XWIND. WIND 130 DEGS 15 MPH ESTIMATED WITH GUSTS TO 25 MPH. CLOUDS BROKEN 4500 FT BAD HAZE; 7 MI ESTIMATED VISIBILITY. DURING LNDG NOTED THRESHOLD OF RWY 17 DISPLACED 6000 FT (NORMAL THRESHOLD IS AT POINT OF INTXN WITH RWY 13-31 (SEE DRAWING ON REVERSE). DID NOT KNOW WHY RWY THRESHOLD WAS DISPLACED (I HAD LANDED ON THIS RWY A FEW MONTHS EARLIER WITH NORMAL THRESHOLD). GASSED PLANE. PROCEEDED TO INTXN DEP AT ABOUT HALF-WAY POINT OF RWY 13 (OVER 5000 FT TOTAL RWY LENGTH). WIND ON THE NOSE 130 DEGS PLUS OR MINUS 15 MPH WITH GUSTS. WHILE ON TKOF ROLL UNICOM ANNOUNCED RWY 13 WAS CLOSED. PROCEEDED TO TKOF WITH NO PROB. NO TFC IN AREA. AFTER TKOF I OBSERVED FOR THE FIRST TIME THE TYPICAL 'X' AT EACH END OF RWY 13-31 WHICH I HAD NOT NOTICED WHILE LNDG ON RWY 17. WHEN ADVISED BY UNICOM THE RWY WAS CLOSED; I WAS NEARING TKOF SPD AND SIMPLY PROCEEDED TO TKOF WITHOUT ANY PROB. APPARENTLY RWY 13-31 HAD ONLY RECENTLY BEEN CLOSED FOR RESURFACING. NO TRUCKS; EQUIP OR WORKERS WERE ON THE RWY (SATURDAY AFTERNOON). FROM THE AIR IT LOOKED LIKE RESURFACING PREPARATIONS HAD STARTED AT THE NORTHERLY END OF RWY 13-31 (ABOUT 2000 FT FROM WHERE I STARTED THE TKOF) BUT THE RWY LOOKED PERFECTLY NORMAL AT THE TXWY INTXN AND THE ENTIRE SOUTHERLY END I USED FOR TKOF. APPARENTLY WORK HAD ONLY RECENTLY STARTED AND WAS PROCEEDING FROM THE NORTHERLY END TO THE SOUTHERLY END. THE PROB RESULTED FROM USING A DIFFERENT RWY FOR LNDG (RWY 17) THAN USED FOR TKOF (RWY 13). THE 'X' MARKINGS ON RWY 13-31 NOT OBSERVED WHILE LNDG ON RWY 17. RWY 13 LOOKED PERFECTLY NORMAL ON THE GND. PRIOR TO LNDG UNICOM ANNOUNCED RWY 17 WAS THE ACTIVE RWY (BUT DID NOT MENTION RWY 13 WAS CLOSED -- NO NEED TO ACTUALLY).