Relationship Between Tectonic Evolutions and Presence of Heavy Oil in The Central Sumatra Basin

Heavy oil is formed through biodegradation process of hydrocarbons, as well water washing, in which light hydrocarbon fraction disappears and leaves the heavy fraction. essentially an asphaltic, dense (low API gravity), viscous that chemically characterized by its high content asphaltenes oil. Although variously defi ned, 25o set upper limit for Central Sumatra Basin evidently a result washing (a hydrodynamic within reservoir) mechanisms. These processes occur tectonic uplift reservoir after it has been fi lled with hydrocarbons. depths are generally shallower than 1,000 feet (300-400 meters), at surface may be associated hence enabling transformation. A combined geology, remote sensing/geographic information system ( GIS), geophysics, stratigraphy, wellbased analyses utilized to serve study. It observed northern part basin, mainly found elds located uphill fault blocks such up-thrown Sebanga thrust Duri, North, Kulin, Rantau Bais, Batang, Akar, Genting elds. In western basin there Kumis, Kotalama Pendalian Dalu-Dalu Gadang Island uplift. total 51 elds/structures containing or suspected contain uplifted geological positions, showing strong relations between evolutions present day presence basin.