You can't tell from the exp log file which version of exp utility was used to produce that dump file. To find out which release of exp was used, you can do one of two things:

a) Open your .dmp file with some text editor - in the very beginning of the file you'll find the release of the exp used. Something like "EXPORT:V08.01.07". This is not realy a good option if the dmp file is veeeery big

b) Show what's in the dmp file by using imp with SHOW=Y and without specifying either FULL=Y nor FROMUSER/TOUSER - that way you won't actualy perform the import, because it will complain that you have to specify FULL or FROMUSER/TOUSER, but it will report which release of exp the dmp was produced with. Something like this:
Code:
C:\Temp>imp system/manager@o901 file=test1.dmp show=y

Import: Release 9.0.1.1.1 - Production on To Sep 30 23:13:00 2003

(c) Copyright 2001 Oracle Corporation.  All rights reserved.


Connected to: Oracle9i Enterprise Edition Release 9.0.1.1.1 - Production
With the Partitioning option
JServer Release 9.0.1.1.1 - Production

Export file created by EXPORT:V09.00.01 via conventional path

Warning: the objects were exported by SCOTT, not by you

import done in EE8MSWIN1250 character set and AL16UTF16 NCHAR character set
IMP-00031: Must specify FULL=Y or provide FROMUSER/TOUSER or TABLES arguments
IMP-00000: Import terminated unsuccessfully