As seen below obsolete EXTRACT1_NAME is showing REQ_SCN = 0.

SQL>SELECT CAPTURE_NAME, CAPTURE_TYPE, STATUS, to_char(REQUIRED_CHECKPOINT_SCN,'999999999999999')as REQ_SCN ,to_char(OLDEST_SCN,'999999999999999')as OLDEST_SCN FROM DBA_CAPTURE;

CAPTURE_NAME    CAPTURE_TYPE STATUS          REQ_SCN      OLDEST_SCN
--------------  ------------ -------        --------      ----------
OGG$CAP_EXTRACT-NAME LOCAL        ENABLED        64983227        64983227
OGG$CAP_EXTRACT1-NAME LOCAL        ENABLED               0               0

 

After unregistering as follows RMAN was able to delete the old archive logs:

UNREGISTER EXTRACT EXTRACT-NAME DATABASE