The Effect of compressibility to Design Deep Foundation of behavior earthfill in Jakarta

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

The Effect of compressibility to Design Deep Foundation of behavior earthfill
in Jakarta

S. Rahman¹, H Pindratno², A. Assegaf¹

¹Majoring Geological Engineering USAKTI
²Department of Mining, DKI Jakarta

ABSTRACT

Geological condition of Northern Jakarta is dominated by alluvial deposits. These material have various enginnering properties which are distinguished by physical and mechanical properties. In orther to know the diversity of physical and mechanical properties in detail, engineering geology data will be needed, such as bearing capacity and settelment

Growing Activities development need support for the balancing environment. Based on the result of hand and machine boring indicate that earthfill in this area consist of the building material piece and house keeping material piece, which are depth range from 1 – 4 m at the surface area. earthfill in Kamal Dadap- Kamal Muara-Pluit area have thickness range from 1-2 m and more than 3 m. Ancol –Sunter –Tanjung Priok Harbor area have earthfill thickness range from 1-2 m, and Kelapa Gading-Kalibaru-Semper­Marunda have thickness more than 3 m. Settlement earthfill and natural soil can not be compared. Therefore, the nature land charatheristics indicate land settlement such as Ancol –Sunter area, which are earthfill not too thick.

Compressibility value in those area have certain distinction. Bearing compressibility in depth 5 m have compressibility between 0.48-0.875, that is middle to high land compressibility, in depth 8 m have compressibility between 0.37-0.692, that is middle to high, and in depth 27 m have compressibility between 0.23 – 0.73 that is small to middle land.

Key word : Environment balance , bearing , earthfill, compressibility value,

charatheristics land, settlement land, alluvial deposits, bearing capacity

SEDIMENTARY ENVIRONMENT OF SAMPOLAKOSA FORMATION AT GONDA BARU SUBDISTRICT SORAWOLIO, BAU-BAU SOUTHEAST SULAWESI

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

SEDIMENTARY ENVIRONMENT OF SAMPOLAKOSA FORMATION
AT GONDA BARU SUBDISTRICT SORAWOLIO,
BAU-BAU SOUTHEAST SULAWESI

Budi Rochmanto and Laode M. Adam

Sedimentology Laboratory Department of Geology, Hasanuddin University
Jalan Perintis Kemerdekaan Kampus Unhas Tamanlarea Km 10, Makassar

ABSTRACT

The research was carried out to examine the age and the sedimentary environment of Sampolakosa Formation at Gonda Baru subdistrict Sorawolio Bau-Bau. Measuring section has been done 250 meters along the outcrop. The measuring section has already been done on the outcrops. The sedimentary environment then be analyzed by determination of fossils contain in the samples.

Lithology of Sampolakosa Formation at the research area is composed of marl with intercalation of limestone and diatomea in the middle and the lower part. The thickness of the outcrop is 61.3 meters. Limestone on the upper part of the section is 3.10 meters thick.

Based on the benthonic foraminifera, the age of the Sampolakosa Formation at the research area is Early Pliocene (N1 8), therefore the lithology at the study area is the middle part of Sampolakosa Formation. The sedimentary environment of the Sampolakosa Formation at the area is middle shelf –lower slope.

IN HOUSE DEVELOPED SOFTWARE OF INTEGRATED WINDOWS- UNIX SEISMIC DATA PROCESSING

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

IN HOUSE DEVELOPED SOFTWARE OF INTEGRATED WINDOWS-
UNIX SEISMIC DATA PROCESSING

Akhsanul Khair and Abdul Haris

Reservoir Geophysics Section, Physics Graduate Program
Faculty of Mathematics and Natural Sciences, University of Indonesia

ABSTRACT

The increase of processing capacity of PC and continuing downsizing of computer platform bring a new role of high end PC to replace the position of main frame. Unix plays the crucial role in the past during the workstation downsizing era. Today the same power of Unix can be run on the available high speed PCs. Since the seismic processing modules are running in Unix system while at the same time users typically prefer windows as a convenience interface so that the integration of Unix and Windows platform will be the best solution.

Seismic Unix, which is collaborative open source seismic processing module from Colorado University, run on the Unix Platform such as Sun Solaris or Linux. It has more than 150 basic modules for seismic processing step. However Seismic Unix lack of interactive user interface. One of the solutions is padding the interface to the core Seismic Unix modules and it is combined with commercial package available in Windows environment. In this paper, we present Window Seismic Unix (WiSU), which provides the interactive of processing package adopted from seismic unix modules. This interactive package provides several number of additional processing module to turn original module to become an enterprise class and user friendly processing package .

WiSU user interactive front end interface is currently developed on higher language of MATLAB, which is Java language in nature. While the backend processing module can be developed using either Windows or Linux programming package or using MATLAB. The flexible developing environment create numbers of development scheme and MATLAB combined with scripting language creates a fast and flexible development environment without scarifying the demand for fast and smooth processing.

Key words: Seismic Processing, Windows, Seismic Unix and MATLAB

FRACTURED GRANITIC BASEMENT AS RESERVOIR

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

FRACTURED GRANITIC BASEMENT AS RESERVOIR

H.D. Tjia

Lestari (Institute for the Environment and Development) Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia

ABSTRACT

Granitic pre-Tertiary basement in northern Sundaland and Indosinia provides two principal reservoir types: fractured competent rock and various forms of its weathered rock. Due to its great dimensions, fractured granite basement blocks of less than 3 per cent bulk porosity have been estimated to individually host over hundred million BBOE. Localised fracture densities and fracture connectivity appear as major constraints to realising the full potential of such reservoirs. Weathered granitic rock has positive reservoir capabilties if it was exposed to semi-arid to arid conditions. Such an environment prevailed at the transition of the Mesozoic to the Cenozoic when northern Sundaland became a vast peneplain. Feldspars and ferromagnesian constituents have not been severely altered and are unlikely to have filled pore space and blocked pore throats. Late Cretaceous granitic rocks outcropping in Peninsular Malaysia and in southern Vietnam were weathered into grus forming metres-thick but kilometre-extensive pediplains, talus, and in-place blankets of partly weathered rock covering flatter surfaces of the exposed plutons. During the Cenozoic, equivalent granitic plutons beneath the currently offshore basins became covered by sediments. Up to Mid-Miocene, block faulting produced horst-and-graben basement structure. The basement highs of fractured and weathered granitic rock became potential recipients of hydrocarbons generated in the topographic lows. Reservoir models of fractured competent granitic rock and of its semi­arid weathered parts summarise decades of study by the author.

SUBSURFACE GEOLOGICAL MODELS OF SEMANGGI, CEPU BLOCK JAVA

PROCEEDINGS JOINT CONVENTION BALI 2007
The 32^nd HAGI, The 36^th IAGI, and The 29^th IATMI Annual Conference and Exhibition

SUBSURFACE GEOLOGICAL MODELS OF SEMANGGI,
CEPU BLOCK JAVA

Premonowati*, Carolus Prasetyadi*, Sigit Rahardjo**, Jonli Sinulingga**, Yayan Sulistiyana*** ,
Dadang Rukmana***

*Dept. of Geological Engineering, FTM-UPNVY
**PT Pertamina
*** BPMIGA

ABSTRACT

The west block of Semanggi field is more productive than in east block. Stratigraphycally, from the ten layers of I until X, the producing layers is IIIB, VII and VIII. The producing layers thickness is between 5 to 13 meter. The 9 MFS datum has devide lithostratigraphy of area as follow: Tawun formation (Layers IX & X), Ngrayong (IV until VIII), Wonocolo ((III), and Bulu (I to II) until depth 875 meter. Regionally, MFS9 from Semanggi correlated to eastward in Nglobo field. The age of reservoir is between N8 to N9 (early of Mid Miocene).

The seismic interpretation and acoustic impedance analysis is used to sub surface mapping reveals the west to eastward anticline, with double plunging upthrust. There are 10 normal fault between them with NNE-SW directly and downdip to eastward. The fourth compartment is separate productive wells, S02 with S04 and S02 with S03.

The Ngrayong formation is deposited in inner to middle neritic with strongly influenced to sea level fluctuation. The geological models is transgressive (aggradasi) sheet sand in shallow marine.

Key words: Reservoir Ngrayong formation, Layers IIIB, VII and VIII, transgressive sheet sand model.