New Insights into the Tertiary Petroleum Systems of the East Java Sea and Southern Makassar Strait, Indonesia

Modern broadband seismic data provides new insight into the Eocene-Miocene syn- to early post-rift sections of the East Java Sea (North Madura) and South Makassar Basin. Previous subsurface imaging suffered from shallow imaging obstacles and hard Eocene-Miocene carbonates, which render the interpretation of basement and overlying early syn-rift sections difficult. Thickness and distribution of these syn-sift sections differ significantly when comparing the North Madura area and the South Makassar Basin. Late syn- and early post-rift carbonate development also differs significantly in that a carbonate inter-reef blanket interrupted by pinnacle reef formation on top of a syn-rift section is present in North Madura. This contrasts with carbonate sections including bioherms that are controlled by the geometry of the underlying basement substrate and which occurs over extensive parts of the western South Makassar Basin. Early syn-rift including source rocks appear limited, requiring petroleum charge generation and migration form the central South Makassar Basin.