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The burn down chart can be set to look at all sorts of numbers, so the first question is "what is the estimation statistic for the board?". If you are estimating and burning down on Story Points, then logging work will not affect the burndown.
Once you have worked out what your burndown estimation is (or should be), then you'll need to look at what burndown is.
A burndown counts delivery vs commitment. An issue is delivered, and its estimate burned-down, when it reaches the "done" part of the process. In Jira that is "any status in the last column on the board". So logging work, even if work-logs are the estimation, will have no effect. What matters is what the estimate was and that the issue becomes "done"
Note that sub-tasks are irrelevant to burn-down as well. They are not the items you commit to, they are an integral part of their parent issue (which is what you do commit to completing), so the estimates and worklogs on them are irrelevant to burn-down.
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