Petroleum Systems Modelling: Charge Evaluation of the Eltham Area

Petroleum Systems Modelling: Charge
Evaluation of the Eltham Area (PEP51150),
Onshore Taranaki Basin
Presenter: Monmoyuri Sarma
New Zealand Energy Corp.
April, 2014
Location
• 377km2
• Granted 23rd Sept 2008 as part of
Taranaki blocks offer process
• Green Gate and GB Energy original
applicants
• TVL 100% 3rd March 2011
• Lightly Explored
• 2 wells prior to Copper Moki
• Sparse seismic
Petroleum System Elements
Seal
Sealed by
Mudstones
Source
Any weak link will break the chain
KS RS
FS MS
Mangahewa Fm.
Kaimiro Fm.
Farewell Fm.
Rakopi Fm.
Structural &
Stratigraphic
Traps
Mt. Messenger Fm.
Moki Fm.
Tikorangi Fm.
Data Available
• Stratigraphic Information from regional stratigraphy and offset wells
• BHTs and /or VRos from Kupe-1, Kapuni Deep-1 (KD-1), Toru-1, Tawa-B1
• Geochemical Parameters from public domain
• Boundary Conditions
Paleo-water Depth (PWD)
Sediment Water Interface Temperature (SWIT)
Heat Flow Estimates
Paleotectonic Setting
Ref: http://www.nzpam.govt.nz/cms/pdf-library/petroleum-basins/continent-of-nz.pdf
‎
Input Data (Tawa-B1)
KD-1
Toru-1
Kupe-1 Tawa-B1
Maturity Calibration
Kupe-1
: VRo data‎from‎Armstrong’s‎thesis
: VRo data from PR1341
KD-1
(RS: Rakopi Source, NC: North Cape, KS: Kaimiro Source,
FS: Farewell Source MM: Mount Messenger)
Temperature Calibration
Kupe-1
KD-1
Tawa-B1
Pseudo well Location
PEP-51150
PSW
PML-38151
Mokoia-1 Rimu-B3A
PEP-51151
Manutahi-1
Input Data (PSW)
Results
MS
KS,FS
RS
Well
TR for
Rakopi
Source
TR for
Farewell
Source
TR for Kaimiro
Source
TR for
Mangahewa
Source
Kupe-1
1.7%
0.9%
none
none
Toru-1
42%
24%
15%
none
KD-1
47%
4%
3%
none
Tawa -B1
70%
60%
55%
51%
PSW
87%
78%
70%
49%
MS
KS
FS
RS
Tawa-B1
PSW
TR of Rakopi Source
TR of Farewell Source
TR of Kaimiro Source
TR: Transformation Ratio
TR % for Toru-1
Results (continued)
All Source rock horizons started
generating HC in Plio-Pleistocene.
Critical moment is not reached yet.
TR of Rakopi Source
TR of Farewell Source
TR of Kaimiro Source
TR % for Kupe-1
Rakopi Source rock horizon started
generating HC in Paleocene.
Farewell and Kaimiro Source rocks
started generation in Plio-Pleistocene.
Critical moment is not reached yet.
TR % for KD-1
Results (continued)
All four Source rock horizons generating HC.
Critical moment is achieved in PlioPleistocene.
TR of Rakopi Source
TR of Farewell Source
TR of Kaimiro Source
TR of Mangahewa Source
TR % for Tawa-B1
All four Source rock horizons generating HC.
Critical moment is achieved in Mid Miocene
for Rakopi and Plio-Pleistocene for Farewell,
Kaimiro and Mangahewa.
TR % for PSW TR % for PSW
Sensitivity Analysis
TR % of RS for PSW
•
All the models shows critical moment in Mid Miocene. Pepper & Corvi and Ungerer
shows beginning of transformation in Early Eocene though actual transformation
picks up in Mid Miocene. The kinetics used for the study are Behar (1997), Burnham
(1989), Ungerer (1990), Vanderbroucke (1999) and Pepper & Corvi (1995).
Sensitivity Analysis (continued)
Sensitivity Analysis on Geochemical Parameters
Model Name
TOC
HI
KSBM (Base Case)
2.6
435
KSLC (Low Case)
2.7
130
KSHC1 (High Case 1)
64
274
KSHC2 (High Case 2)
24
430
TR % of KS for PSW
Sensitivity Analysis on Erosion
TR % of RS for PSW
Model Name
PSW
PSWBE
(increased
Erosion)
Kapuni
100
150
North Cape
50
250
Rakopi
150
500
Basement
1200
2000
Petroleum Systems Element
•
•
Reservoirs were deposited contemporaneously.
Migration via major faults
Conclusions
•
At the Tawa-B1 and PSW location Rakopi source rocks started generating
hydrocarbons in the Middle Miocene. All other source rocks attained critical moments in
the Plio-Pleistocene.
•
The major reservoir rocks (Moki and Mount Messenger) were deposited in Middle
Miocene while Urenui was deposited in Late Miocene.
•
Some of the generated oil has been trapped in stratigraphic and structural traps in
these reservoirs. Success of these plays relies on the overlying mudstones acting as
good seals.
Acknowledgements
• Co-Authors, Colleagues
• NZEC Management
• Schlumberger (IES-Gmbh) PetroMod 1D Express v11 sp3

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