Abstract

Borholla-Changpang field falls in Dhansiri valley of Assam and Assam Arakan Basin and represents classical example of Paleogene multiple sandstone reservoirs overlying fractured basement reservoirs of Pre-Cambrian age. The Tertiary sandstone reservoirs range in age from Paleocene-Eocene in Paleogene section and Miocene Pliocene in Neogene section. The Borholla field was discovered in the year 1969 and commercial oil was established from sandstone reservoirs in Paleogene and gas from Neogene section. Later in the year 1973 first time, commercial oil was established from fractured basement of Borholla field. Since then Borholla field is producing from Paleogene sandstone reservoirs as well as fractured basement reservoir.