Unable To Open Physical Database For Testing?

I have problems in opening the database of the physical standby in read- write mode/ read only mode. I have a primary server which is running on 2 node RAC and the standby on a seperate single server being used as DR. I recently got this server and my aim was to isolate the standby server from primary server and perform few test. As it has never been tested even once.

Primary Database spec: (2 Node Rac on ASM)
Oracle Version : 10.2.0.3.0
O/s : HP-UX B.11.23

Standby Database spec: (Single Node)
Oracle Version : 10.2.0.3.0
O/s: HP-UX db01 B.11.23

Error:

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alter database recover managed standby database cancel;

Database altered.

SQL> alter database open
2 ;
alter database open
*
ERROR at line 1:
ORA-16004: backup database requires recovery
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '+DATA/dprod/datafile/system01.dbf'

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Parameters :

log_archive_dest_2 string SERVICE=PROD1 LGWR ASYNC VALID
_FOR=(ONLINE_LOGFILES,PRIMARY_
ROLE) DB_UNIQUE_NAME=PROD
remote_archive_enable string true
fal_client string DPROD
fal_server string PROD1, PROD2

Steps tried so far:
Changed log_archive_dest_2 = DEFER on both the primary nodes

Standby :

startup nomount
alter database mount standby database;
alter database recover managed standby database disconnect;
alter database recover managed standby database cancel;
alter database open/readonly (tried both)
Same error.

On Primary:
SQL> select max(sequence#) from v$log_history;

MAX(SEQUENCE#)

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55702

on Standby:

MAX(SEQUENCE#)

--------------------------------------------------------------------------------
33289

Primary Database:

SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME FROM V$ARCHIVED_LOG ORDER BY SEQUENCE#;

SEQUENCE# FIRST_TIME NEXT_TIME

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55700 13-JUN-11 13-JUN-11
55700 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11
55702 13-JUN-11 13-JUN-11

60824 rows selected.

Standby Database:

SEQUENCE# FIRST_TIME NEXT_TIME

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55698 13-JUN-11 13-JUN-11
55699 13-JUN-11 13-JUN-11
55700 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11

15206 rows selected.

Additional Information : There is a delay of 20 minutes before the logs get applied. which has been intentional set by team. Dataguard broker is not configured as well.