State-owned Oil and Natural Gas Corporation (ONGC) has discovered over 230 million tonnes of in-place oil reserves in the last three years, Petroleum Minister Dharmendra Pradhan said on Monday. ONGC as on April 1, 2019, has in-place oil reserves of 459.84 million tonnes, he added. The money spent on crude oil imports was highest since 2013-14, he further said.