Test log is a file which specifies, whether a particular 
testcase, that you have executed has been passed or not. 
Test Log has attributes like 
1)Testcase ID
2)Test description 
and 
3)Status (in status you have to mention pass of fail)
In this you will be mentioning only status of the testcase

Coming to Bug report
In bug report we have to give detail information, like:
1)Serial number
2)testcase id 
3)defect description/steps to reproduce 
4)status (whether it is open,new,fixed,reject,reopen or 
closed)
5)severity (how sever is the bug)
6)priority (based on this, developer should fix the bug)
7)version number or release number
8)detected by (tester name)
9)date of detection.

Hi

  Test Log is Report on Test Case Execution
   (includes Pass / Fail status)
               where AS
  Defect Logging is a Report on Defect
 (Failed Test case , only fail status)


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