RWY INCURSION BY AN FA20 CPR JET ONTO RWY 19L AT SNA; CA.

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ON MAY/MON/04; WHEN TAXIING FOR DEP FROM SNA FOR OUR TRIP TO CLM; WE HAD A RWY INCURSION. THERE WAS NO EVASIVE ACTION REQUIRED AND A DESCRIPTION OF THE EVENT IS DESCRIBED BELOW. WE WERE PARKED AT AN FBO S OF TXWY D. TAXI INSTRUCTIONS WERE TO TAXI VIA TXWY A; HOLD SHORT OF TXWY D. AFTER THE XING ACFT PASSED; WE WERE INSTRUCTED TO CONTINUE TAXI TO RWY 19R; HOLD SHORT OF TXWY L. PRIOR TO REACHING TXWY J; WE WERE INSTRUCTED TO TURN L ON TXWY J THEN R ON TXWY C AND HOLD SHORT OF TXWY L. THERE WAS AN ACR FLT HOLDING ON TXWY A SHORT OF TXWY L. THERE WAS ANOTHER ACR BACK TAXIING ON RWY 19L. WE MADE THE L TURN ON TXWY J AND ASSUMED THAT ACR Z ACFT WAS TAXIING ON TXWY C. IT WAS NOT UNTIL WE STARTED THE R TURN THAT WE REALIZED OUR MISTAKE. THE TXWYS WERE MARKED PROPERLY; BUT WHEN WE LOOKED AT THE ARPT DIAGRAM IT APPEARS THAT THERE IS GRASS BTWN TXWYS A AND C; WHICH DOES NOT EXIST. TXWY C IS NARROW AND WE MISTOOK IT FOR A VEHICLE ACCESS ROAD. THE FACT THAT ACR Z WAS TAXIING ON RWY 19L ALSO CAUSED US TO MISTAKE IT FOR TXWY C. WE ACKNOWLEDGED OUR MISTAKE WITH GND CTL AND APOLOGIZED FOR OUR ERROR. THEY INSTRUCTED US TO CONTINUE THE BACK TAXI ON RWY 19L; TURN L ON TXWY K; HOLD SHORT OF RWY 19R AND CONTACT TWR. NO FURTHER ACTION WAS TAKEN. SNA ARPT IS A VERY BUSY ARPT WITH A LOT OF MIXED OPS; COMMERCIAL; LIGHT AND HVY GA ACFT. UPON FURTHER REVIEW OF THE ARPT DIAGRAM; IT WOULD SEEM THAT ACFT PARKED ON THE FAR S SIDE OF THE ARPT WOULD HAVE LESS CONGESTION AND CONFUSION IF ACFT WERE INSTRUCTED TO TAXI ACROSS RWY 19L AT TXWY D; THEN TAXI TO RWY 19L VIA TXWY B. THIS WOULD CAUSE US TO HAVE TO WAIT TO CROSS AN ACTIVE RWY; BUT THIS AREA OF THE ARPT IS LESS CONGESTED.