State-owned Bharat Petroleum Corporation Ltd. (BPCL) on Tuesday reported a largely flat net profit of Rs 3,191.49 crore for the January-March quarter after taking an impairment loss of Rs 4,349.13 crore on upstream investments amid changing prospects in oil and gas blocks. The company had posted a profit of Rs 3,214.06 crore in the year-ago quarter, while profit stood at Rs 7,545.27 crore in the preceding quarter, according to a stock exchange filing. BPCL said its wholly-owned subsidiary Bharat PetroResources Ltd impaired investments in domestic and overseas oil and gas assets, reducing the carrying value of upstream investments to Rs 11,313.83 crore from Rs 15,426.37 crore.