CEKUNGAN SUMATRA CEKUNGAN SUMATRA SELATAN SELATAN ALUWISIA JULI H (26139) HERNING DYAH KUSUMA W (26491)
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CEKUNGAN SUMATRACEKUNGAN SUMATRA
SELATANSELATAN
ALUWISIA JULI H (26139)HERNING DYAH KUSUMA W (26491)
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LOKASI
Terletak di bagian selatanTerletak di bagian selatanpulau Sumatrapulau Sumatra
Batas :Batas :
utara : Peg. Tigapuluhutara : Peg. Tigapuluh
Barat : Peg. BarisanBarat : Peg. Barisan
Timur : Palembang &Timur : Palembang &Lampung highLampung high
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GELOGI REGIONALGELOGI REGIONAL
EVOLUSI TEKTONIKEVOLUSI TEKTONIK
Kompresi akibat kolisi antaraKompresi akibat kolisi antara
lempeng Eurasia dan lempenglempeng Eurasia dan lempengIndia pada Middle MezosoikIndia pada Middle Mezosoik
EkstensionalEkstensional selama Paleosenselama Paleosen ±±Miosen AwalMiosen Awal
Tektonik relatif tenang padaTektonik relatif tenang padaMiosen AwalMiosen Awal ±± PliosenPliosen
KompresiKompresi Inversi ,Inversi ,
pengangkatan basementpengangkatan basement
(Pliosen(Pliosen ±± sekarang)sekarang)
Implikasi
Stratigrafi
South Sumatra Basin merupakan back arc basin (sejak Pliosen)
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Kolisi lempeng Eurasia danKolisi lempeng Eurasia dan lempenglempengIndia pada Middle MezosoikIndia pada Middle Mezosoik
(Kolisi lempeng India dari arah relativ selatan)(Kolisi lempeng India dari arah relativ selatan)
Sesar geser dekstral WNW - ESE ( Sesar
Lematang,kepayang,saka,pantai selatanlampung, musi lineament) dan N-S trend
Terjadi wrench movement
intrusi granit berumur Jura - kapur
KOMPRESI
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Ellipsoid model(Pulunggono, et al., 1992)
UPPER JURASSIC ± LOWER CRETACEOUS
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LINEAMENT PADA SOUTH SUMATRA BASIN
(Pulunggono, et al., 1992)
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Fase ekstensionalFase ekstensional selamaselama
PaleosenPaleosen ± ± Miosen AwalMiosen Awal
Sesar normal & sesar tumbuh berarah NSesar normal & sesar tumbuh berarah N ±± S danS danWNWWNW ±± ESEESE
Pembentukan basin berupa graben/half grabenPembentukan basin berupa graben/half graben
Pengisian awal dari cekungan (Pengisian awal dari cekungan (Syn RiftSyn Rift ±± RiftingRifting))
F. LahatF. Lahat Lingkungan darat ± brackish
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(Pulunggono, et al., 1992) Ellipsoid model
UPPER CRETACEOUS ± LOWER TERTIARY
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Tektonik relatif tenang padaTektonik relatif tenang pada
Miosen AwalMiosen Awal ± ± Miosen akhir Miosen akhir
Pengisian cekungan :Pengisian cekungan : (Fase Sagging)(Fase Sagging)
FORMASIFORMASI LINGKUNGANLINGKUNGANF. Talang akar Gritsand (ss)F. Talang akar Gritsand (ss) Braided streamBraided stream
transisi member (shale)transisi member (shale) Delta plainDelta plain
F. Baturaja (lmstF. Baturaja (lmst reef & klastik)reef & klastik) Shallow marineShallow marine
F. Gumai ( shale, clay, ss, kaya foram )F. Gumai ( shale, clay, ss, kaya foram ) Deep MarineDeep Marine
F. Air Benakat ( clay dgn foram)F. Air Benakat ( clay dgn foram) MarineMarine -- brackishbrackish
F. Muara Enim ( shale, clay, ss, coal)F. Muara Enim ( shale, clay, ss, coal) Shallow marine-non marine
Tektonik pada Miosen Tengah sesar NE - SW
Akibat wrench movement
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Inversi , pengangkatan basement
(Pliosen ± sekarang)
KompresiKompresi
Pengangkatan bukit barisan
(Pembentukan sesar Semangko )
Reaktivasi sesar ± sesar tua
Pembentukan antiklin berarah barat laut
Aktivitas vulkanisme back arc basin
Pengisian cekungan (Fase Inversi)
F. Kasai ( clay, tuff.ss) Darat
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(Pulunggono, et al., 1992) Ellipsoid model
MID MIOCENE - RECENT
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KOLOM
STRATIGRAFI
( Bishop, 2000 )
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(Bishop, 2000)
SOUTH SUMATRAPROVINCE
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B ASIN INFILLINGB ASIN INFILLING
FASE SYNRIFTFASE SYNRIFT : Eosen Awal: Eosen Awal
F. Lahat :lower : konglomeratic tuff.ssF. Lahat :lower : konglomeratic tuff.ss
continental,lacustrinecontinental,lacustrineFASE RIFTING : Eosen tengahFASE RIFTING : Eosen tengah ±± AwalAwal
Oligosen akhirOligosen akhir
Upper Lahat : Benakat shaleUpper Lahat : Benakat shale
LacustrineLacustrine
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�� F. Talang akarF. Talang akar
-- Gritsand : ss, claystGritsand : ss, clayst Braided streamBraided stream
-- transisi member : transisi member : shaleshale marginal marinemarginal marine
�� F. BaturajaF. Baturaja
-- lmst reef & klastiklmst reef & klastik shallow marineshallow marine
�� F. GumaiF. Gumai ( maks. Trangressi)( maks. Trangressi)
-- shale, clay, ss, kaya foramshale, clay, ss, kaya foram marinemarine
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F. Air Benakat ( regresif phase)F. Air Benakat ( regresif phase)-- clay dgn foram, dgn clay & ssclay dgn foram, dgn clay & ssmeningkat pada bag. atasmeningkat pada bag. atas marinemarine
F. Muara EnimF. Muara Enim
-- shale, clay, ss, coalshale, clay, ss, coal fluvialfluvial ±±shallow marineshallow marine
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FASE INVERSI : PliosenFASE INVERSI : Pliosen ±± PleistosenPleistosenF. Kasai
- clay, tuff.ss fluvial -terestrial
Source material dariaktivitas vulkanik (Bukit
barisan)
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LOKASI
Terletak di bagian selatanTerletak di bagian selatanpulau Sumatrapulau Sumatra
Batas :Batas :
utara : Peg. Tigapuluhutara : Peg. Tigapuluh
Barat : Peg. BarisanBarat : Peg. Barisan
Timur : Palembang &Timur : Palembang &Lampung highLampung high
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IMPLIKASI TEKTONIKTERHADAP TATANAN STRATIGRAFIDI CEKUNGAN SUMATRA SELATAN
(Hasan et al, 1988)
R R
EE
VV
IIEE
WW
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KOLOM STRATIGRAFISOUTH PALEMBANG BASIN
(Sarjono et al , 1989)
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PETROLEUM SYSTEMPETROLEUM SYSTEM
SOURCE ROCKSSOURCE ROCKS1.1. Formasi LahatFormasi LahatTOC 1.7TOC 1.7 ±± 8.5 wt%8.5 wt% Excellent potentialExcellent potentialHI 130HI 130--290 mg290 mg
Derajat kematangan 0.64Derajat kematangan 0.64 ±± 1.4 %Ro.1.4 %Ro.
Kerogen Tipe I dan II, IIIKerogen Tipe I dan II, IIIMature TMature T--max 436max 436--441441 00CC
2.2. FormasiFormasi Talang AkarTalang AkarTOC 1.TOC 1.55 ±± 8 wt%8 wt% GoodGood -- ExcellentExcellentHI 1HI 15500--310310 mgmg
Derajat kematangan 0.Derajat kematangan 0.5454 ±± 1.1.33 %Ro.%Ro.
Kerogen Tipe I dan II,IIIKerogen Tipe I dan II,III
Gradien geothermal 49Gradien geothermal 49
00
C/kmC/kmMature TMature T--max 436max 436--45045000CC
3.3. FormasiFormasi BaturajaBaturajaTOC 0.5TOC 0.5 ±± 1.5 wt%1.5 wt% FairFair -- GoodGoodKerogen Tipe I, II, IIIKerogen Tipe I, II, IIIMature TMature T--max 436max 436--45045000CC
4.4. Formasi GumaiFormasi GumaiTOC 0.5TOC 0.5--11.5 wt%11.5 wt% fairfair -- excellentexcellentKerogen Tipe IIIKerogen Tipe IIIEarly mature TEarly mature T--max 400max 400--43043000CC
5.5. Formasi AirbenakatFormasi AirbenakatTOC 0.5TOC 0.5 ±± 1.7 wt% Fair1.7 wt% Fair -- GoodGoodImature TImature T--max < 430max < 43000CC0.290.29--0.30 %Ro0.30 %Ro
6.6. Formasi MuaraeneimFormasi MuaraeneimTOC 0.5TOC 0.5--52.7 wt%52.7 wt% FairFair -- ExcellentExcellentImature TImature T--max < 430max < 43000CC0.290.29--0.30 %Ro0.30 %Ro
Oil window s pada kedalaman1200 ±1500m
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(Suseno et al, 1992)
KUALITAS TOCVS
DEPOSITIONAL
ENVIRONMENT(South Palembang Basin)
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MAJOR LINIAMENT & HEAT FLOW
(Pulunggono, et al., 1992)
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SOURCE ROCKMATURITYPADA F.TALANG AKAR &
BATURAJA
SOUTH PALEMBANG BASIN
(Sarjono et al., 1989)
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SOURCE ROCKMATURITYPADA F.GUMAI
SOUTH PALEMBANG BASIN
(Sarjono et al., 1989)
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RESERVOARRESERVOAR
1.1.BasementBasement (Granit , Kursit )(Granit , Kursit )Fracture, Porositas mencapai 7 %Fracture, Porositas mencapai 7 %
2. Lahat2. Lahat (ss, konglomerat)(ss, konglomerat)
Cadangan terhitung 88 MMBOECadangan terhitung 88 MMBOE
3. Talang Akar3. Talang Akar (Gritsand, transition : ss)(Gritsand, transition : ss)
Reservoar utama (75%)Reservoar utama (75%)Cadangan terhitung 2 BBOECadangan terhitung 2 BBOE
Porositas 15Porositas 15 ±± 30%, permeabilitas 5 darcy30%, permeabilitas 5 darcy
4. Baturaja limestone4. Baturaja limestone (Reef, carb.platform)(Reef, carb.platform)
Cadangan terhitung 1 BBOECadangan terhitung 1 BBOE
Porositas 18Porositas 18 ±± 38%, permeabilitas 1 darcy38%, permeabilitas 1 darcy5. Gumai5. Gumai (Karbonat,ss)(Karbonat,ss)
Cadangan terhitung 130 MMBOECadangan terhitung 130 MMBOE
Porositas 20%Porositas 20%
HC GENERATION VS TIME VS MIGRATION
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RESERVOARRESERVOAR
6.6. Air Benakat (ss )Air Benakat (ss )Porositas mencapai 25 %Porositas mencapai 25 %
7.7. Muara Enim (ss)Muara Enim (ss)Cadangan terhitung 179 MMBOECadangan terhitung 179 MMBOE
Porositas 30%Porositas 30%
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Reservoar Pada Basement (Sumur ASD 1)
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TRAPTRAP
Antiklin berarah NWAntiklin berarah NW--SE (Miosen)SE (Miosen)Pinch out dan Carbonate build upPinch out dan Carbonate build up
SEALSEALTalang Akar dan Gumai (regional seal)Talang Akar dan Gumai (regional seal)
MIGRATION PATHWAYMIGRATION PATHWAYMigrasi mulai Akhir Miosen TengahMigrasi mulai Akhir Miosen Tengah
Migrasi vertikal terjadi melewati zona sesarMigrasi vertikal terjadi melewati zona sesar
Sedangkan migrasi lateral terjadi ke arahSedangkan migrasi lateral terjadi ke arahnormal dip slope melalui carrier bednormal dip slope melalui carrier bed
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MIGRASI OIL & GASPADA F.BATURAJA - TALANGAKAR SOUTH PALEMBANG BASIN
(Sarjono et al., 1989)
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MIGRASI OIL & GASPADA F. GUMAISOUTH PALEMBANG BASIN
(Sarjono et al., 1989)
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Geological cross section with HC generation
(Sarjono et al., 1989)