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Dr. B. Situmorang
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
Chemical Engineering, Chemistry & Bioengineering Energy

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CRUSTAL STRUCTURE OF THE MAKASSAR BASINAS INTERPRETED FROM GRAVITY ANOMALIES : IMPLICATIONS FOR BASIN ORIGIN AND EVOLUTION Dr. B. Situmorang
Scientific Contributions Oil and Gas Vol 12 No 1 (1989)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.12.1.1139

Abstract

The gross enistal structure of the Makassar basin has been interpreted from gravity anomalies in confunction with bore hole information and seismic reflection data, Considerubly attenuated conrinental crust appears to underline the basin which reflect a single episode of continental rifring, that has been active in the area during Eocene. Lower Miocene times. The implication of that interpretation for tectonic model are discussed and the overall evolution of the basin from  Middle Jurassic onward proposed.
SEDIMENT COMPACTION AND ITS INFLUENCE ON BASEMENT SUBSIDENCE Dr. B. Situmorang
Scientific Contributions Oil and Gas Vol 10 No 3 (1987)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.10.3.1148

Abstract

Compaction of claystones-shales and limestones penetrated by well TT-1 and TT-2 in the western margin of the South Makassar Basin (SMB) has been evaluated. Each type of lithology exhibits specific porosity-depth relationship which is characterized by an exponential curve. In the study area the relationships are : = 69.e0.000391 for claystones-shales and o 59.e-0.000731 for limestones, where o is the porosity (%) and z is the depth below the top of the sediments.            Those relationships facilitate decompaction of the sediments and hence restoration of their original thick-. nesses. This study indicates that the thicknesses of the sediments have been significantly reduced by compaction. It is evident that basement subsidence during Miocene times should be increased by 100 to 308 m if cotrected for compaction.            Understanding the (basement) subsidence is an important aspect of basin analysis as it facilitates the calcu- lation of the amount of extension from which the formation of sedimentary basin can be modelled.
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