[Avodah] What was the point of Avrahams tefilla/debate with Hashem about Sdom?

[Marty Bluke via Avodah]

When Hashem informs Avraham that he is going to destroy Sdom, Avraham
launches into tefilla/debate with Hashem and tries to use logical/emotional
arguments to save Sdom. What was Avraham's point? Did he really think he
could influence Hashem's decision with logical/emotional arguments? How
does this fit into our general understanding of Tefilla?
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