@superbattleshipyamato Given Japan’s focus on basically using the Chinese population as slave labor to fuel their economy, I doubt it. Only way I can see them finding anything like that would have been in some kind of “what-if” scenario:
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Japan is run by cooler heads who stop after making Manchuko into a puppet state (i.e. no broader invasion of China). The peaceful (but tense) climate may have allowed Japan to properly investigate the area.
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The Xi’an Incident (when the CCP kidnapped Chiang Kai Shek and forced him to pause the Chinese Civil War to fight Japan) didn’t happen. With Nationalist China still primarily fighting the Communists, Japan may have opted to sit back and let China weaken itself, giving it time to properly investigate the area.
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Hitler is stopped early (either by never coming to power, being toppled by a coup before 1936, etc.). Most of Japan’s aggression stemmed from the notion that the world powers were more concerned with happenings in Europe vs. what Japan was doing in China. More direct pressure from the west would probably have prevented the further breakout of hostilities and created a scenario where Japan may have had time to properly investigate the area.
Note that these are all pretty unrealistic scenarios (except the Xi’an Incident not occurring. That’s a pretty interesting rabbit hole to go down).
That being said, the oil field wasn’t discovered IRL until 1959, so the technology needed to find it probably outright wasn’t there at any point before 1941.