Project Launching, Symposium and Tecnical Meeting
9-12 June, Gyeongju City, Korea (M2)
SHALE HYDROCARBON POTENTIAL IN THE SOUTH SUMATRA BASIN
CCOP – KIGAM Unconventional Oil and Gas Project: Mapping of Black Shale Formation for the Prediction of Shale Resources (UnCon Project)
OUTLINE
BACKGROUND and AIMS
GEOLOGICAL SETTING
1
2
3
RESULTS 5
4
CONCLUSIONS
6
DATA
RESEARCH METHOD
Background
Geological Agency, 2011
Indonesia that has a long history for an oil&gas
producing country, is predicted to have abundant of
Shale Hydrocarbon (HC) that spread out in some
mature basins (i.e: The South Sumatra Basin).
Indonesia is facing energy crisis, and Shale HC is one of
the promising alternative fuel energy resources to be an
important facet of the nation’s energy.
In the near future, Lemigas will conduct a pilot project
of shale HC in order to prove their potential reserves
in a commercial basis.
Theoretically, a mature
basin may produces both
of conventional and
unconventional oil&gas.
AIMS of The Reseach
To characterize and maps shale HC plays in the
South Sumatra Basin.
To calculate natural resources of shale HC
within the high graded areas.
Regional Structures and Stratigraphy The Tertiary half-grabens and major faults
of the SSB Province are oriented NW-SE
and NE-SW.
Numerous depocenter bounded by major
faults.
Lahat/ Lemat lacustrine shales and
Talangakar shallow marine and deltaic
coaly shales are the mature source rocks.
The province contains the Lahat, Lemat
and Tertiary petroleum systems.
Oil and gas are produced from the
onshore South Sumatra Basin Province.
Shale from Lahat and Talangakar
Formations were widely accepted as
general source rocks within the province.
Lemat and Talangakar Source Rock
Reservoir, therefore, are the main targets. (Bishop, 2001)
Data Availability Distribution of well and seismic data • Seismic quality : poor – medium (seismic data
is dominated by vectorization seismic data)
• Well Log data has no S-wave sonic
• Geochemical information is limited
Jelapang-1
Kemang-1 Tepus
Singa-1
Lab. Analysis results of surface data (not all surface data reflects the sub-surface character)
PT-3 well shows the Lahat Formation at 2125 mMD with
TOC ranging 5-6%, S1 = 1.69, S2 = 42.19, Tmax = 4410C, Ro
= 0.7, and HI = 200 – 750 (Yuliandri et al., 2013)
Research Method
7
Data
- Well
- Seismic
- etc
Work flow of Sweet spot Identification
Unfortunately, this
workflow was unable to
follow
Seismic attributes were
not exercised in this study
due to limited data
condition.
Maps of Brittleness Index
and TOC can not be
produced due to not
enough supporting data.
Static Model
Results Shale HC Play
Sweet Spot Area
Shale HC Resources
8
Sequence Stratigraphy Correlatiom
Schematic of chronostratigraphy of
some wells
NW SE
4.5 km
SINGA-1
Kemang-1
SB-1 eq. Top Basement
SB-2 eq. Top Lemat/lahat Fm.
SB-3 eq. Top TAF
Jelapang-1
Jelapang-1
Kemang-1
Singa-1
Tepus
Kemang-1
Singa-1
Tepus
Jelapang-1
Kemang-1
Singa-1
Tepus
Marine shale
Deltaic/Lacustrine
Fluvial
Paleogeography map of Upper TAF
Paleogeography map of Lemat/Lahat Fm.
Time structure of Basement
Deep Area (estimated as
Source Rock Reservoir)
Source of paleogeography maps:
Ginger-Fielding, 2005
TOC Prediction by using
Passey’s method (1990)
∆𝑙𝑜𝑔𝑅 = 𝑙𝑜𝑔10
𝑅
𝑅𝑏𝑎𝑠𝑒𝑙𝑖𝑛𝑒+ 0.02𝑥 ∆𝑡 − ∆𝑡𝑏𝑎𝑠𝑒𝑙𝑖𝑛𝑒
𝑇𝑂𝐶 = ∆𝑙𝑜𝑔𝑅 𝑥10(2.297−0.1688𝑋𝐿𝑂𝑀)
LOM=9
LOM=10
LOM=11
KPG-1
KPG-1 WELL
Sweetness
Spectral decon
Singa-1 well has no complete log
SINGA-1
Maturity Modeling
14
Top Oil Window is
ranging from 2000 –
2500 m depths
Peak Oil Window is in
the range of 2500 –
3200 m depth.
Gas Generation
Window is deeper than
3200 m depth.
Suggesting the Lemat
and Talangakar SRR
maybe mature enough
to generate oil and gas.
TOP BASEMENT
SB 1.1
SB 4
SB 6
Mendarai-1Talang Gendum-1 Tasim-1
N S
Jelapang-1 Rukam-1 Gajah Besar-1
B T
SB 8
MATURITY MODELING
Present Day ( 0 Ma)
GEOCHEMISTRY ANALYSIS (From Well)
No sample data for Validation
Need the fix method for getting the good solution
PETROPHYSICAL
Petrophysical summary of the Lahat Formation parameters at depth
2125 - 2175 mMD (PT-3) are: Porosity = 3 %, Sw = 0.88 %, and
kerogen density = 2.62 gr/cm³ (Yuliandri et al., 2013)
The Surrounding Area of
- Jelapang well
- Kemang well
- Singa well
- Tepus well
Calculating Method
Identify and Calculate
Natural Resource of Sweet Spot Area
Generally,
Sequence-1 = SB-1 – SB-1.1
Sequence-2 = SB-1.1 – SB-2
Sequence-3 = SB-2 – SB-3
Result: there are 9 maps :
For example (2 maps)
Lewis et al.(2010)
Downey et al. (2011)
Jarvie et al.(2004) Absorbed Gas
Free Gas
Oil
Conclusion
South Sumatra Basin could be a very viable
energy resource in the near future for
Indonesia.
Both Lemat and Talangakar plays have good
Shale HC potential, suggesting these primarily
results to promise further Shale HC
exploration in South Sumatra Basin.
www.lemigas.esdm.go.id
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