On December 16th., 1969, the gravity survey contract between Total Indonesia and Geological Survey of Indonesia (Direktorat Geologi) was signed. The gravity survey was carried out in djambi (Lagan Area) and in Riau region (Indragiri Hilir Area). The lagan Area Lies between Batang Hari in the south, the North and in the East, and in the West is the u…