petroleum prospectivity of selabangka and the … · 2019. 12. 18. · abuki-1 well mesozoic oil...

PETROLEUM PROSPECTIVITY OF SELABANGKA AND THE ADJACENT AREA – Preliminary Study –

“PENYIAPAN REKOMENDASI WK MIGAS SELABANGKA”

Bandung, 10th December 2019

By:

Muhammad Firdaus

2

INTRODUCTION

SELABANGKA OFF-SHORE SUMMARY

REGIONAL GEOLOGY

MANUI BASIN

ANALOGY TO SURFACE

CONCLUSION & RECOMMENDATION

Outline

Introduction

Aims • To identify the Petroleum System Elements and possible plays,

leads, and prospects within Selabangka (Manui Basin) and Surrounding Areas

• To build our understanding of Late Miocene Transgressive Sequence in Selabangka (Manui Basin) and its correlation to Petroleum System

About the Study • Integrated sedimentology, paleotology,

and stratigraphy, from outcrop to Subsurface (Well, Seismic, Gravity).

Oil and Gas Seep in SE Sulawesi.

ABUKI-1 WELL

Mesozoic Oil

Torete Oil Seep

M/z 191 Triterpane

M/z 191 Triterpane

Kolo Atas Oil Seep

Wosu Oil Seep

M/z 191 Triterpane

16 LS 10

Residual Gravity Map

Tertiery Oil

Seismic Acquisition 2018

Oil Seep

Gas Seep

Research Area

Selabangka area

Manui area

SEISMIC AND WELL DATA

• 2D PSTM Manui Area that covers an area of 51.3 x 44.5 KM .

• Has NE-SW and NW-SE trending in-lines spaced at 25 m and the NE-SW trending cross-lines spaced at 12.5 m.

• Provides high-quality image from seafloor to around 5s TWT.

• The Miocene Transgressive Sequence has a vertical seismic resolution of appr 10-30m.

• Abuki-1 Well : TD 7347 ft (KB), Reached Early Miocene Sequence (TD)

Data Set & Workflow

SEISMIC ATTRIBUTE EXTRACTIONS

1. Variance : highlight geological relief/fabrics,e.g., faults, channels, and sedimentary contacts

2. RMS amplitude : emphasizes acoustic impedance change within a specified interval

SEISMIC ATTRIBUTE EXTRACTIONS

3. Max magnitude : Illustrates the variaton of the max amplitude within a specific interval

4. Edge-detection attribute : highlights geological relief

Location Map with Seismic & Well availability

: Seismic Acquisition - 2018

Selabangka Offshore

Area

Manui Area

Kendari

Abuki-1

: Study Area (general)

: Study Area (focus)

SELABANGKA OFFSHORE

5

A

B

N

C

D

C D

A B

Regional Cross Section

S E L A B A N G K A O F F - S H O R E

TERTIERY - RECENT PACKAGE

BASEMENT ?

BASEMENT ?

TERTIERY - RECENT PACKAGE

Miocene Carbonate on wrench-related structure Play A B

Top Miocene Carbonate Depth Map

A

B

S E L A B A N G K A O F F - S H O R E

Lead 3 : • 3 mmbo Oil (P50) • 5.5 mmcf Gas (P50)

1 2

3

BPKKA Pertamina (1996)

MANUI BASIN

8

Tectonostratigraphy of South East Sulawesi

Hall and Sevastjanova (2012)

Middle – Late Mioecene Paleogeography

The Jurassic comprehensive stratigraphic column of the North Carnarvon Basin (Chongzhi, et.al, 2013)

Paleogeographic maps compiled from Chongzhi, et.al., 2013

High-Land Terestrial Influx Important for Source Rock Second Neogene Rollback (12.5-7 Ma; Hall, 2002) gave accommodation space for Deposition of Miocene Marine Transgressive Sequence

Nugraha and Hall (2018)

Nugraha and Hall (2018)

: Abuki-1 Well

Abuki 1 Well

Figure 3. Oblique Views of Edge-detection attribute map of the Pliensbachian Maximum Flooding Surface (JP-MFS, Figure 3a, b, c); Detailed interpretation of fault architecture of WA484P-3D seismic survey area with schematic fault displacement profile (Figure 3d); Representative seismic section of the WA484P-3D seismic survey with detailed interpretation showing structural and stratigraphic architecture (Figure 3e). JP = Pliensbachian; JO = Oxfordian; KV = Valanginian; MFS = Maximum Flooding Surface; SB = Sequence Boundary; ES = Erosive Surface; J1-6 represent horizons picked within the Jurassic deltaic succession from older to younger.

Middle-Late Miocene

M. Miocene

E. Pliocene

E. Pliocene

L. Pliocene

Pleistocene -

Recent

AGE

Electrofacies – Abuki 1 Well

Figure 3. Oblique Views of Edge-detection attribute map of the Pliensbachian Maximum Flooding Surface (JP-MFS, Figure 3a, b, c); Detailed interpretation of fault architecture of WA484P-3D seismic survey area with schematic fault displacement profile (Figure 3d); Representative seismic section of the WA484P-3D seismic survey with detailed interpretation showing structural and stratigraphic architecture (Figure 3e). JP = Pliensbachian; JO = Oxfordian; KV = Valanginian; MFS = Maximum Flooding Surface; SB = Sequence Boundary; ES = Erosive Surface; J1-6 represent horizons picked within the Jurassic deltaic succession from older to younger.

Marginal Marine Estuarine Sequence

M I D D L E - L A T E M I O C E N E

Chrono Stratigraphy / Seismic Stratigraphy

Nugraha and Hall (2018) A

B

No interval has entered Maturity Window

Ro History Shows no Interval of sequence reached Ro 0.6

TOC dan Pyrolisis Result (from fieldwork Ebuny 2018)

Source Rock Evaluation

Five samples from Abuki-1 Well yielded TOC values (1.06-3.74%) (Eq. to Middle – Late Miocene Sequence.)

No Sample ID

General Lithology

TOC (%)

S1 S2 S3 PY Tmax (C)

PI PC HI OI

Mg/g

1 Ba 03 Shale, browhnish grey, oxydized, non-calc

0.64 0.04

0.14 0.23 0.18 558 0.22 0.01 22 36

2 Ba 24 Shale, brownish grey, oxydized, non-calc

1.31 0.04

0.09 0.34 0.13 487 0.31 0.01 7 26

3 Ba 60 Shale, dark grey, calc.

2.99 0.05

0.15 0.24 0.2 526 0.25 0.02 5 8

Three samples from Fieldwork yielded TOC values (0.64-2.99%) (Eq. to Middle – Late Miocene Sequence.)

Reservoir Potential

Tunjukin studi yang states estuarine deposit sangat potential jadi reservoir

Hasil Petrofisik Abuki-1 khusus untuk interval Langkawola unit.

ɸ T 26-30%

ɸ eff 13-21%

Abuki-1 Well : Vclay, Porosity, Water Saturation (Fm. Langkawola) • Penentuan Vclay dengan

nilai GR

• Penentuan porositas dengan model Neutron Density

• Penentuan Sw menggunakan persamaan Indonesian water saturation, dengan parameter:

a = 0.62

m = 2.13

n = 2

• Poor HC Shows di kedalaman,

5370 ftMD 5431 ftMD 5436 ftMD 5522 ftMD 5524 ftMD 5925 ftMD

Petrophysical Result Summary from Abuki-1

Formasi Facies Interval Kedalaman

(ftMD)

Volume Lempung Rata-rata

Porositas Total

Rata-rata

Porositas Efektif

Rata-rata

Saturasi Air Rata-rata

Lan

gkaw

ola

Upper Shoreface 5368.5 5478 0.46 0.28 0.15 0.69

Lower Shoreface 5478 5553.5 0.52 0.28 0.13 0.73

Upper Shoreface 5553.5 5582.5 0.35 0.29 0.19 0.69

Lower Shoreface 5582.5 5638 0.41 0.3 0.17 0.6

Beach 5674.5 5745 0.38 0.28 0.18 0.61

Washover 5745 5818.5 0.44 0.30 0.17 0.66

Tidal Channel 5829 5946.5 0.39 0.28 0.17 0.63

Tidal Channel 5946.5 6015.5 0.50 0.24 0.14 0.67

Tidal Channel 6066.5 6256 0.47 0.27 0.15 0.65

Meander Fluvial 6256 6339 0.46 0.26 0.15 0.61

Fluvial Floodplain 6339 6501.5 0.39 0.26 0.16 0.54

Braided Fluvial 6501.5 6532.5 0.44 0.25 0.17 0.54

Fluvial Floodplain 6532.5 6610 0.37 0.32 0.21 0.37

• Poor HC Shows :

5370 ftMD 5431 ftMD 5436 ftMD 5522 ftMD 5524 ftMD 5925 ftMD

Reservoir Potential

A

B Seismic 2D line [M88-40A_MANUI_GEOSIN_01011988_MV] Seismic 2D line [M89-22_MANUI_GEOSIN_01011989_MV_ASSO]

26691

23361

19981

16671

13331

9991

6671

3341

2531

5841

9151

12441

15771

19121

22461

25751

M88-26_MANUI_GEOSIN_01011988_MVM88-26_MANUI_GEOSIN_01011988_MV

Composite line 33M89-41_MANUI_GEOSIN_01011989_MV

Composite line 30M88-20A_MANUI_GEOSIN_01011988_MV

M88-40_MANUI_GEOSIN_01011988_MV Composite line 56M88-17A_MANUI_GEOSIN_01011988_MV

Composite line 43Composite line 35


TRACELINE

0

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-6500

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-6500

C

D

C D

Key Cross Section Seismic 2D line [M89-14B_MANUI_GEOSIN_01011989_MV] Seismic 2D line [M89-53_MANUI_GEOSIN_01011989_MV_ASSO]

20271

13491

6771

15901

12591

9291

5941

2641

10191

55361

10741

4171

D-24_ABUKI_PT PAC_02011990_MVD-25_ABUKI_PT PAC_02011990_MV


Composite line 42 M88-43A_MANUI_GEOSIN_01011988_MVM88-43A_MANUI_GEOSIN_01011988_MV

Composite line 42M88-48A_MANUI_GEOSIN_01011988_MV


MANUI SW-NEComposite line 48


TRACELINE

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-4500

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A B

: Top M-L Miocene: Top E-M Miocene: Top Base Miocene (Basement?)

Base Miocene

M-L Miocene E-M Miocene

Time Map

Depth Map Base Miocene

M-L Miocene E-M Miocene

Leads Map

18691

17351

16041

14711

13371

12031

10701

9361

8031

6701

5361

4031

2701


M88-21_MANUI_GEOSIN_01011988_MV02M88-21_MANUI_GEOSIN_01011988_MV02



M88-15A_MANUI_GEOSIN_01011988_MVM88-15A_MANUI_GEOSIN_01011988_MV

TRACELINE

0

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A B

A

B


Migration Pathways

Recommended Well

Play Element

Trap Faulted Anticlinal Nose

Seal Holocene-Early Pliocene Boepinang Siltstone-Claystone

Source Late Miocene Sequence

Reservoir Late Miocene Sequence

31661

28991

26311

23661

21001

18341

15681

13031

10351

7691

5031

2371

11



Composite line 56 M88-43A_MANUI_GEOSIN_01011988_MVM88-43A_MANUI_GEOSIN_01011988_MV

Manui SE-NWM89-26_MANUI_GEOSIN_01011989_MV

TRACELINE

0

-500

-1000

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A B

A

B : Top M-L Miocene: Top E-M Miocene: Top Base Miocene (Basement?)

Play Element





Seismic 2D line [M88-41_MANUI_GEOSIN_01011988_MV] Seismic 2D line [M89-24_MANUI_GEOSIN_01011989_MV_ASSO]

14451

12771

11111

9441

7761

6101

4441

15581

13911

12261

10601

8941

7281

5611

3951

2301

M88-26_MANUI_GEOSIN_01011988_MVComposite line 42 M88-23_MANUI_GEOSIN_01011988_MV

Composite line 33 MANUI SW-NE Composite line 30

M89-53_MANUI_GEOSIN_01011989_MV_ASSOM89-53_MANUI_GEOSIN_01011989_MV Composite line 42

M89-11_MANUI_GEOSIN_01011989_MV_ASSOComposite line 43


M89-01_MANUI_GEOSIN_01011989_MV

TRACELINE

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A B

A

B


Play Element





Sub-surface Analogue to Surface ?

Triassic Toronipa member from Meluhu Fm (TRJm)

Recent Study indicates this member has

an age of Middle-Late Miocene (from palinology assemblage)

: Palinology Sample Point

REVISED GEOLOGICAL MAP

Toronipa Member of Meluhu Fm

Abuki-1 Well

: Exploration Well

Polen – Recent Age Determination from Fieldwork Data

A & B. Florschuetzia meridionalis, C & D. Florschuetzia levipoli, E & F. Florschuetzia trilobata, G. Rhizophora sp., H. Myrtaceae pollen, I. Shorea type, J. Podocarpus spp., and K. Tricolporites sp.

Florschuetzia Meridionalis Zone indicates age of “Middle Miocene – Late Miocene”, Eq. to N11-N18 (Lelono et al., 1996; Lelono, 2007).

Analogue to Surface Depositional model of Middle to Late Miocene deposits in Toronipa peninsula:

wave-dominated estuarine

1 7 3

4

6

2

5

10 11

28

Fluvial – Meandering System

Cross-Bedded Stratified Sandstone

CONCLUSION

1. Selabangka Offshore area is not recommended for Hydrocarbon Exploration as it is located in a high risk region (very deep area), Thin sediment package, Inadequate Source rock, and has a low potential accumulation.

Aims • To identify the Petroleum System Elements within

Selabangka Basin and Surrounding Areas • To build our understanding of Late Miocene

Transgressive Sequence of Manui Area and its correlation to Petroleum System

2. Manui Basin is recommended to continue for the future exploration because it has evidence of active petroleum system and possible accumulation

3. Petroleum System Elements Within Manui Basin: • Source Rock and Reservoir : Intraformational Middle-Late

Miocene Transgressive Sequence

• Trap and Seal : Anticlinal Strucutral Nose, with Boepinang Siltstone as Seal

32

RECOMMENDATION

FIELD-WORK: 1. Composite Stratigraphic

Section of Middle-Late Miocene Outcrop.

DESKWORK 1. HC accumulation

/sweetspot by Seismic Attributes

2. Detailed Seismic Stratigraphy to constrain more detail of paleogeographic map (per-interval)

3. Property’s Surface to Sub-Surface Correllation

LAB-WORK 1. Rock Characterization

using pore geometry structure (Middle-Late Miocene Unit)

2. Re-Analysis samples from Abuki-1 Well

3. Oil to SR correlation 4. Biostratigraphy

Evaluation.

33

THANK YOU

34

Hall (2019)

35

Hall (2019)

Hall (2019)

36

petroleum prospectivity of selabangka and the … · 2019. 12. 18. · abuki-1 well mesozoic oil...

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