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-Awang H. Satyana-
Berikut ini adalah tautan catatan-catatan Pak Awang yang telah dimuat di Geotrek Indonesia. Selamat membaca…
Numerous oil and gas seeps occur on Java Island concealing prospective basin sediments. However, most of this island is covered by volcanic products of Paleogene to Recent times. The volcaniclastic sediments buried the source rocks, burying the source rocks to depths of oil and gas windows. Oil and gas seeps in volcanic areas of Java show the presence of active petroleum systems underneath the volcanic cover. This indicates hydrocarbon prospectivity on Java Island (subvolcanic play) that is so far unexplored. Volcaniclastic covers are notorious for causing poor seismic data quality, making subsurface imaging difficult. This will challenge the methods and techniques of seismic and nonseismic data acquisition and processing. Once these challenges are resolved, the subvolcanic play of Java may be revealed.
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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
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This is a note about a paper presented in International Geosciences Conference and Exposition in Bali almost 3 years ago. This paper highlights the origin of crustal structures of Eastern Sundaland. Based on evaluation of available seismic, gravity, and magnetic data, the author proposed tectonic interpretation of the areas and the implications for petroleum accumulation.