New constraints from wells penetrating the basement and oils discovered in Eocene section

 

Awang_makassar basement

The Makassar Strait located between Kalimantan and Sulawesi Islands in Central Indonesia is a north-south orientated seaway, around 700 km long, 125-400 km wide with maximum water depths almost 2500 m. Bathymetrically, the Makassar Strait is divided into the northern and southern depressions and are hence sometimes referred to as the North and South Makassar Basins.

While the Paleogene history for the opening of the Makassar Straits is commonly agreed by many authors, the mechanism of the opening of the Straits and nature of the basement underlying the straits have been the subjects of considerable scientific debates. The debates in history are mainly because of lack of data representing direct data on the geology of the Makassar Straits. Most debates were based on modeling of subsidence history, gravity, magnetic and plate tectonics.

Satyana (2015) presents new data of the North Makassar Strait basement penetrated by two exploration wells: Rangkong-1 and Kaluku-1. The basement analyses include: Petrography, XRD, biostratigraphy, petrochemistry,
magnetic susceptibility, multi-isotope geochronology, and organic geochemistry. Oils discovered by Kaluku-1 well in Eocene section provides further information based on analyses of bulk properties, carbon isotope, and various
biomarkers.

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The South Makassar Strait mass transport complex

Cipi_mtc makassar

 

Hi all!  In a deep-water environment, mass transport complexes (MTCs), products of mass transportation processes, often dominate the basin stratigraphy, and are intercalated  with turbidite deposits (Dykstra et al., 2011).  MTCs are commonly large enough to be geohazards, and the largest can be tsunami genic (e.g., Watts, 1998, 2003; Wright and Rathje, 2003; Mosher et al., 2010; Yamada et al., 2011). MTCs became of interest to oil and gas exploration and development when wells and facilities were placed in deep-water environments (Shipp et al., 2004; Mosher et al., 2010; Yamada et al., 2011).

Data from the southern part of the Makassar Strait basin revealed a very extensive mass transport complex (MTC) in the upper part of the basin fill that covers an area of ~8985 km2. Here Armandita et al. (2015) focus on describing the morphology of this giant relatively coherent MTC, and try to explain why it is characterized by large-scale internal deformation rather than disintegrating into smaller, more chaotic blocks.
Read the abstract, or check the publisher page to read the full text, or contact the author to get a copy of this paper.