You can access worklogs through project permissions or team permissions.
With the View All Worklogs project permission, you can see all worklogs associated to that project. This includes descriptions, hours, the members logging work and any work attributes associated to those worklogs.
With the View Team Worklogs team permission, you can see all worklogs associated to the team. This includes all of the information described above.
Separately, for the cases where you need to see the number of hours associated to a project but not the individual worklogs, you can use the View Issue Hours project permission.