In 1932, the Soviet company produced 188,889 tons, and the Japanese concessionaires, 185,435 tons.
So 360,000 tons from fields that arent discovered until 50 years later arent too bad.
You completely missed what someone said about onshore-offshore fields, and how the site YOU LINKED says the Japanese were using that concession (onshore) field until 1944, AND that it didn't produce enough to be at all valuable.
In other words, they were ALREADY producing as much as they could from th onshore oil fields, AND the Japanese didn't get enough to be any real influence on their strategy.
In 1943, the nadir of USSR oil production, they were producing 18 million barrels. As such, the ballpark figure of what they were getting (360,000 barrels) was in total 2% of USSR production, 1.6% or so of UK production, and less than a tenth of a percent of US production.
Given that Gazprom, when talking about the present oil fields there, says first oil was 1999... then it strongly suggests that the 1940s oil was insignificant enough that oil companies today all but forget about it.
Japan was getting less oil from those fields than the DEI were producing in 1938... by a factor of FORTY.
180,000 versus 7,340,000 tons.
If they'd captured the other half of the field, their total oil supply from it would be 5% of what they'd gain by taking the DEI. Does THIS explain why we were using words like "insignificant"?