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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People
Person ranking
77
Yevgeny Kuyvashev
Last position: Governor (Government of the Sverdlovsk region)
77
7
Aleksey Shmykov
Last position: Deputy governor (Government of the Sverdlovsk region)
7
Organizations
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131
PJSC Gazprom Neft
Main activity:Mining
131
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487
487
365
365
48
48
39
39
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21
21