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Publication 2013

PROCEEDINGS, INDONESIAN PETROLEUM ASSOCIATION

Thirty-seven Annual Convention & Exhibition May 2013

 PALEOGENE FACIES MODEL OF NORTH BARITO AREA, COMPREHENSIVE STUDY OF SEDIMENTOLOGY, STRATIGRAPHY AND POTENTIAL RESERVOIR

 Purnama Ary Suandhi*, Andang Bachtiar**, Prihatin Tri Setyobudi*, Muhammad Rozalli*, Yudi Satria Purnama**

* GDA Consulting, ** Exploration Think Tank Indonesia

ABSTRACT

North Barito Shelf is one of the most potential exploration area in Central Kalimantan which is proven producing hydrocarbon in border of Upper Kutai – North Barito Basins. Significant gas condensate accumulation has been discovered in Oligocene Carbonates in Kerendan Field, Teweh Permit by Union Oil in 1982. Paleogene petroleum system play is one of the main target in this area including reservoir target. Integrated stratigraphy, sedimentology features, facies and potential reservoir information from outcrops samples of Paleogene Sediments Units should be a guide line to explore the potential of petroleum system. Data is derived from outcrops and laboratory analyses results. Studied area covers area of  Bintang Ninggi – Gunung Purai – Muara Teweh (Central and East Kalimantan).

Comprehensive stratigraphic measurement in the North Barito area showing 6 (six) sediments units (chronostratigraphy), consisting of Pre-Tertary, Middle Eocene, Late Eocene, Early Oligocene, Late Oligocene, and Miocene Sediment Unit. The pre tertiary basement rocks are consisting mica schist and quartzsite. Middle Eocene Sediment Unit are consisting of 5 (five) facies unit, i.e; Alluvial Fan, Fluvial Braided and Meandering River, Fluvial to Upper Delta Plain,Lower Delta Plain – Delta Front,Prodelta/Offshore. Late Eocene Sediment Unit are consisting of  3 (three) facies units, i.e; Lower Delta Plain – Delta Front, ProDelta/Offshore, Offshore – Bathyal. Early Oligocene Sediment Units are consisting of 4 (four) facies units, i.e; Tidal Flat/Barrier Bar, Shoreface, Carbonate Complex, Offshore – Bathyal. Late Oligocene Sediment Unitsare Consisting 5 (five), i.e: Shoreface, Carbonate Complex, Offshore – Bathyal, Tidal Flat/Barrier Bar, Fluvial – Delta Plain – Delta Front Facies. Miocene Sediment Unit are consisting of 5 (Five) facies units, i.e Lower Delta Plain – Delta  Front, Delta Plain – Delta Front, Delta Front – Prodelta, Pro Delta/Offshore, Fluvial – Delta Plain – Delta Front.

Keywords: Paleogen, Facies, North Barito

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PROCEEDINGS

HAGI-IAGI Joint Convention Medan 2013

28 – 31 October

Litofasies studies and Maturity Levels of Ngrayong Deltaic Sandstone, Tawun Formation Jamprong Region, Kenduruan District, Tuban and Its Implications for Reservoir Quality

Bhaskara Aji1) Prihatin Tri Setyobudi1) Rizqi Syawal1) Aveliansyah1)

1) Forum Geosaintis Muda Indonesia (FGMI)

Abstract

 Ngrayong Sandstones member of Middle Miocene Tawun Formation, is one of the main reservoir in the North East Java Basin. Currently depositional environment of Ngrayong Member is still being debated, because in Cepu area and surrounding sediments with relatively similar characteristics can be interpreted into two different environments are deltaic and deepwater turbidite. The difference being the object of interest to be discussed related to hydrocarbon reservoir potential.

The integrated research methods are surface geological mapping, measured stratigraphic column, granulometry analysis (spericity, roundness, composition, grain size and sorting variations), petrography, porosity and permeability measurements.

Litofacies unit in the mapping area are Facies of Shale with Sandstone Intercalation, Coal and Gypsum Fragments, Sandstone Facies, Siltstone Facies, Interbeding Sandstone – Siltstone Facies, and Red Sandstone Facies. Sedimentary structures such as bedding fisillity, bedding, bicurrent crossbedding, oscillation ripplemark, flaser, lenticular bedding, coarsening upward. Petrographic analysis of red sandstone shows types of sandstone such as Arenite Quartz, arkosic Wacke until Sub Arckose. Granulometri analysis shows sortation ranged from poorly – moderately, level of roundness and sphericity are low sphericity with a little clay content, showing a level of maturity from submature until mature which was deposited with medium energy. Porosity and permeability test of Sandstone facies  result porosity 32% -44% with permeability-833 mD –  0.015 mD, and Porosity and permeability test of Red Sandstone facies result porosity 32% -41% with 90 – 404 mD permeability. Based on an integrated analysis of sedimentology known that many facies was deposited in Pro-delta environment and Delta Front. The most excellent reservoir quality are the Red Sandstone facies and sandstones  facies with good porosity and permeability which are interpreted as part of mouth bar from deltaic system.

Keywords: Ngrayong, Delta, Sandstone

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PROCEEDINGS

HAGI-IAGI Joint Convention Medan 2013

28 – 31 October

Sedimentology of Fluvial-Deltaic Coal Formation in Kutai Basin Based on Various Outcrops, Previous Geological Study and Modern Mahakam Delta Analogue

Prihatin Tri Setyobudi1) Purnama Ary Suandhi1) Andang Bachtiar1) Achmad Miri1)

1) GDA Consulting (PT. Geosain Delta Andalan)

 Abstract

Kutai Basin is Tertiary basin which is the largest coal producers in Indonesia. Basic sedimentology knowledge, regional geology controlled and modern environment analogue are needed to support coal exploration activity specially coal seams correlation framework in the fluvial – deltaic environment in Lower Kutai Basin.

The methods of this research are spot mapping in several coal outcrops in Samarinda – Tenggarong areas (Lower Kutai), comprehensive stratigraphic measurement in the Muara Teweh – Kutai Barat areas (Upper Kutai Basin) and modern Mahakam Delta sedimentology observation in the Samarinda area as modern analogue reference for fluvial – deltaic depositional environment.

There are several coal bearing formations which is famous in the Kutai Basin, start from the oldest is Middle – Late Eocene coal (equivalent to Tanjung Formation), Late Oligocene – Early Miocene coal (equivalent to Pamaluan Formation), Middle Miocene coal (equivalent to Balikpapan Formation). Middle to Late Miocene coal formation is the most productive formation which is exploited in Kutai Basin.

Middle to late Eocene deltaic coal characters are black, platy and blocky cleavage, vitreous luster, vitrain to clarain lithotype, thickness 20 to 30 cm. Late Oligocene – Early Miocene delta plain coal is characterized by black, blocky cleavage, hard to medium hard, thickness 30 to 70 cm. Middle to Late Miocene delta front coal is characterized by oyster bed coal, high gamma ray. Middle to Late Miocene fluvial coal character is coal sandwiching sandstone.

Modern Mahakam delta observation are showing several depositional environment which has potential become coal bearing environment. The first is fluvial flood plain environment, upper delta plain, lower delta plain, tidal distributary bar, delta front mouth bar and back spit / back lagoon.

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