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Option 1: Venture Production is not the oil exploration and production company operated in Siberia and owned by the ONGC.
Option 2: Regal Petroleum is not the oil exploration and production company operated in Siberia and owned by the ONGC.
Option 3: Enterprise Oil is not the oil exploration and production company operated in Siberia and owned by the ONGC.
Option 4: Imperial Energy is the correct answer. It is the oil exploration and production company operated in Siberia and owned by the ONGC (Oil and Natural Gas Corporation). Imperial Energy is based in London and focuses on oil operations in the Tomsk region of Western Siberia, Russia. ONGC acquired Imperial Energy in 2008, making it a subsidiary of ONGC Videsh Limited (OVL), the international subsidiary of ONGC.
Therefore, the correct answer is option 4, Imperial Energy.