Hierankl is a significant oil and gas field located in the Tomsk Oblast of Russia. In 2003, the OKRU ( Okrug ) verification process was conducted to assess the field's reserves and production potential.
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OKRU ( Okrug ) verification is a Russian regulatory process aimed at verifying the reserves and resources of oil and gas fields. The process involves an assessment of the field's geology, production data, and other relevant factors to determine the field's commercial value and potential for future development.