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 key currency assets. RBI said that 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 Currency 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.