Country's forex exchange reserves have surged 1.46 billion to 277.73 billion dollar in the week ended October 4 on the back of a healthy growth in the keycurrency assets, the Reserve Bank said today. The reserves had dipped by 1.12 billion to 276.26 billion dollar in the previous reporting week. According to the RBI data, the Foreign Currenty Assets expressed in dollar terms, include the effect of appreciation or depreciation of the non-US currencies such as the euro,pound and yen held in the reserves.After remaining unchanged for five weeks, gold reserves increased 41.3 million to 21.76 billion dollar.The data showed that the special drawing rights rose by 14.7 million to 4.439 billion dollar, while India's reserve position in IMF shot up by 7.2 million to 2.197 billion dollar.