To Sverdlovsk Region started looking for oil though it is known of it long ago. Why it did not get earlier?

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#Ural Federal District
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Actually, in the region found already four oil fields...
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Analysis
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People
Person ranking
85
Yevgeny Kuyvashev
Last position: Governor (Government of the Sverdlovsk region)
85
12
Aleksey Shmykov
Last position: Deputy governor (Government of the Sverdlovsk region)
12
Organizations
Organization Ranking
230
PJSC Gazprom Neft
Main activity:Mining
230
Places
Place ranking
567
Sverdlovsk region
Regional center
567
405
405
66
66
60
60
45
45
Technologies
Technology ranking
42
42