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PETROLEUM PLAY DAN ANALISA

CEKUNGAN ASEM-ASEM TERHADAP

POTENSI HIDROKARBONDiponegoro Ariwibowo

Geby Rezky

Vengky Cristo

STT Migas Balikpapan

Jurusan S1 Teknik Perminyakan

Konsentrasi Teknik Geologi

Pengantar Cekungan Asem-asem

Cekungan Asem-asemSecara Geologi, Berada di Sisi Tenggara Kerak Benua Sundaland

Dan berada di bagian selatan cekungan Kutai

Secara Demografi , berada di Provinsi Kalimantan Selatan dan

Sebagian masuk wilayah Kalimantan Timur

Cekungan Asem-asem

Cekungan Barito

Geologi Regional

Gambar Element Tektonik Cekungan Asem-asem

Mengapa Demikian ???

Tatanan Tektonik Apa Buktinya ???

Bukti Zona Subduksi pada zaman

Kapur

Melance Deposit

Melance Deposit

Geologi Regional

Basement

• Berdasarkan Kolom Stratigrafi Formasi

mana yang potensial Kandungan

Hidrokarbon ?

Formasi Warukin

Formasi Berai

Formasi Tanjung

Atau endapan Aluvial

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Petroleum Play “Berhasil Menemukan minyak”

Rig Alpha 1

Kisah Sukses : Blok SebukuFour (4) phases of exploration history:

Phase I: 1966 to 1978

- Awarded to Refining Associates

(Canada) Ltd (70,826 sqkm)

- Kyushu acquired the latter’s interest;

subsequently BP and UCPI held the

interest (UCPI as Operator)

- UCPI drilled 4 wells in 1970 and shot

4288 km 2D seismic (1966-1973)

- 1974 Ashland farmed-in and drilled

Makassar Straits-1 gas discovery (tested 9.2 mmscfd)

- 1975 Elf Aquitaine farmed-in and

drilled 2 wells in 1976 and PSC

terminated in Dec 1978

Phase II: 1978 – 1997

- No exploration activity

Four (4) phase of exploration

history:

Phase III: 1997 – 2003

-Gulf Indonesia signed the

Sebuku Block in 1997

- Reprocessed and shot 2D

seismic (1998 – 1999)

- Drilled Pangkat-1 oil discovery

in Dec 2000 (tested 100 bopd)

Phase IV: 2003 up to now- PEARL took over in June 2003

- Reprocessed and shot 2D

seismic (2003 – 2004)

- Re-interpret the area prior to

drilling an exploratory well in

2005

Ringkasan Sumur

Data Seismik SGF98-38A (Taka Talu-1)SW NE

Data Seismik SGF98-13 (Taka Talu-2)SW NE

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Data Log sumur Taka Talu 2Line SGF98-19 (Pangkat-1 & Makassar

Straits-1)

Well Makassar Straits-1

9.22 MMSCFGD

8 BCPD

3945-4275

Gross 330 ft

Net Pay 283 ft

Avg Pay Por 17.1%

Sw 15-30%

N/G 0.86

Sebuku PSC: Makassar Straits-1 Petrophysical

Analysis

Sebuku PSC: Makassar Gas Field – Hydrostatic

Analysis

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0MAKASSAR ST RAITS-1

LKG - 4220.0’

POS S GDT 4615.0’

Reserve Estimate (BCF)

P90 P50P50 P10

PEARL 222 356356 524

NSAI 120 327327 556

Makassar Gas Field

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� Rifting occurred in Paleocene/early Eocene time

and rifts were infilled mostly by lacustrine and fluvio-deltaic sediments later becoming marine;

post-rift is dominated by marine influence as indicated by widespread carbonate and marine

shale deposition.

� Main reservoirs are Eocene SS of Lower Tanjung

Fm equivalent and E. Oligocene – E. Miocene Berai Limestone; secondary reservoir is Mid-Late

Miocene Warukin SS & Carbonates and Tertiary/Pre-Tertiary Basement rocks.

� Main source rock is Eocene shales and coals

deposited in lacustrine and fluvio-deltaic

environments.

� Shales of Tanjung, Berai, Warukin and Dahor Fms act as seals.

� Trapping mechanism mostly structural closures,

some bounded by faults, as well as reefs.

� Hydrocarbon migration probably began in

Oligo/Miocene time.

Generalized Stratigraphy & Petroleum System

SW-NE Schematic Structural Cross

Section SWSWSWSW NENENENE

Biostratigraphy Correlation

Traverse - Index Map

Martaban-1Martaban-1

Makassar St-1Makassar St-1Pangkat-1Pangkat-1 Taka Talu-1Taka Talu-1

Traverse - 1 & 2

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Taka Talu-2Taka Talu-2

Lari Larian-1Lari Larian-1

Traverse - 3 & 4

Lari Larian-1Lari Larian-1 Makassar St-1Makassar St-1

Traverse - 5 & 6

Top Basement - TWT Map (C.I. 20ms) Top Lower Tanjung - TWT Map (C.I. 20ms)

Top Berai - TWT Map (C.I. 20ms)

BERLIAN

1 Gas 1 Gas Makassar StraitsMakassar Straits--1 Gas 1 Gas

Discovery Discovery

CI: 20 msecCI: 20 msecCI: 20 msecCI: 20 msec

MUTIARA

Top Berai TWT Map

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Makassar Straits-1

Makassar Straits-1

Gross pay: 330 feet

Net pay: 283 feet

N/G: 0.86

Avg por: 17%

Avg Sw: 15%

Perf 35 feet interval :

Flowed 9.22 mmscfd w/

Some condensate (3/8”chk)

Gross pay: 330 feet

Net pay: 283 feet

N/G: 0.86

Avg por: 17%

Avg Sw: 15%

Perf 35 feet interval :

Flowed 9.22 mmscfd w/

Some condensate (3/8”chk)

Petrophysical Analysis - Makassar Straits-1 Berai Carbonate Paleogeography

Hydrocarbon Kitchen

Lower Tanjung to Basement Lake Deposit to Basement

Isochron Maps

Maturity Modelling – Makassar

GrabenPlay Concepts & Hydrocarbon Potential

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Kesimpulan

• Petroleum sistem pada cekungan asem-asem yaitu:� Source Rock : Source Rock Utama Formasi Tanjung pada

Batulempung dengan jenis kerogen didominasi oleh gas rawaninertinit vitrinit.

� Reservoir Rock : Reservior rock utamanya adalah FormasiTanjung dengan Porositas 20 % hingga lebih besar 30 % danpermeabilitas 105 milidarcy sampai 212 milidarcy

� Caps Rock : Batulempung Formasi Tanjung atas

� Trap : Perangkap Hidrokarbon didominasi strukutur sesar

• Berdasarakan Hasil pemaparan makalah, maka Cekungan Asem-asem memiliki potensi Hidrokarbon yang potensial untuk terus di explorasi.

Terima Kasih

Kami berterima kasih Kepada :

1. Bpk. Adi gunawan Selaku Dosen Geologi Minyak

dan Gas Bumi

2. Rekan-rekan mahasiswa Tenkik Geologi STT Migas

3. Kedua Orang Tua atas Doanya