Multibeam exploration in the Makassar strait

Middle Eocene Palaeogeography of the Greater Makassar Strait Region, Indonesia: A Review of Eocene Source Rock Distribution

“…Thick Early-Middle Eocene deepwater syn-rift clastics were penetrated in wells up-thrown (north) of the fault (Camp et al, 2009). This is also consistent with the gravity and magnetic images (Decker et al, 2004).…”

Middle-Lower Eocene turbidites: a new deepwater play concept, Kutei basin, East Kalimantan, Indonesia

“…These extend south into the shallow offshore area based on hydrocarbon shows from Eocene sandstones in the Makassar-A1 and Birah-1 wells. Widespread thermogenic gas seeps sampled by seafloor cores (Decker et al, 2004) further extend the known presence of thermally mature source rocks into the southern limits of the Mangkalihat uplift.…”

“…Eocene synrift isopachs are unreliable in determining the trends of the half graben basins due to the inability to accurately map the top of the pre-Tertiary basement from vintage 2D seismic data. Based on gravity and magnetic data, Decker et al (2004) interpret northeast-southwest oriented rift basins that are perpendicular to the inferred extension direction during the Early Eocene opening of the Makassar Strait.…”

“…Some structures (e.g., Birah and Makassar) have faults that reach the seafloor that could allow hydrocarbons to leak to the surface as indicated by the presence of thermogenic gas in seafloor cores (Decker et al, 2004). Eocene faults truncated at the Late Eocene unconformity could provide a migration pathway for hydrocarbon migration but these faults are adequately sealed by overlying mudstone units.…”