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Geological Workflow
3D and Volume AttributeMapping and Variogram
Seismic AttributeAmplitude, Semblance
Geology and Geophysics3D Seismic
Depositional EnvironmentAnalogue Model
Regional GeologyPaleogeography and Analogue
Structural
Log MotifVertical and Horizontal
Sequence Stratigraphy
Well CorrelationField and Regional
Stra
tigr
aphi
c C
orre
lati
on
GeologyWell Logs input
Input Data Loading and QC
Sedimentary
Well Interpretation
5.2 Ma
10.5 Ma
Horizon III Unconformity
Shallow Regional Unconformity
Upper Intermediate Unconformity
*from Global Sea Level Curve
Regional Seismic CompilationKenari-Kasawari-NC3-NC8-NC4
NE
SW
- Accumulation on top of the half-graben high elevation
- Localized build up- Outer shelf margin
- Central Luconia Province- Cycle IV / V- Mid to Late Miocene
Depositional Setting
Bunga Pelaga HighSK316
HST
TSTLST
HST
TSTLST
Reef Architectures
Prograde
Catch UpBack Step
N
Steep
Gentle
HST
TSTLST
HST
TSTLST
HST
TSTLST
HST
TSTLST
HST
TSTLST
Modeling Workflow
* Constructed Geological Concept but no Facies
defined
Structural Framework
Grid cells (nI x nJ x nK) 64 x 41 x 396
Rotation angle: 26.0
Grid cells (nI x nJ x nK) 64 x 41 x 396Total number of 3D grid cells:
1,039,104
Number of geological horizons:397
Average X inc: 99.95Average Y inc: 98.50Average Z inc (along pillar): 2.70Rotation angle: 26.0
Z: -2049.50 Top Carbonate
Z: -2820.80 Top Intra 6 (S)
Z: -2570.00 Top Intra 4 (S)
Z: -2121.00 Top Intra 1
Z: -2230.00 Top Intra 2
Z: -2388.00 Top Intra 3
Z: -3035.00 Top Intra 8 (S)
Z: -2930.00 Top Intra 7
Z: -2698.00 Top Intra 5
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000
-340
0-3
200
-300
0-2
800
-260
0-2
400
-220
0
-3400-3200
-3000-2800
-2600-2400
-2200
Make Horizon, Zone and Layering- 5 surface depth structure from
seismic interpretation- tied with well markers- Top carbonate as erosional
surface while the rest is base
Volume correction set as equal for internal zone between Top Carbonate and Top Intra 4 (S)
Volume correction for other internal zone are proportional
Minimum cell thickness set as 2 for all setting in Horizon, Make Zone and Layering
All surfaces are restore as base except Top Carbonate restore eroded
Well Blocking
Thickness at the crest: 1434mNumber of geological layers: 396Average K layer:2.70m
Upscaling method:- Porosity = Arithmetic- Permeability = Harmonic
Variogram AnalysisLocal Structural Azimuth analysis support the structure is rotated 26 from North
Local Structural Dip analysis firmed the geological depositional setting where low dipping angle from Intra 4 to Base Carbonate and hi dipping angle near Top of Carbonate
Analog from NC3 / NC8 Model
Variogram Analysis
Vertical Proportion
Azimuth
Length (ft) 7000 m
Width (ft) 4200 m
Property Modeling
Distribution method:Gaussian Random Function Simulation
Variogram analysis:Analogue from NC3 / NC8 Model: Major 600, Minor 300Vertical Proportion: 3mAzimuth: 26
Vertical Function:Porosity – Depth Trend
Property ModelingDistribution method:Gaussian Random Function Simulation
Variogram analysis:Same setting as Porosity Model
Property Modeling
bHAFWLaSw el )(mod
21
Fluid Contact
Petrophysical analysis:FWL = 3035 TVDSS
Petrel 2011.2 (64‐bit) SchlumbergerDate Wednesday, June 27 2012 15:05:26 Lower gas contact: Contact set\MLCASE @ 3035Project KASAWARI_PMU_JUL2012_YD.pet Porosity: PHIT_SGS_BaseModel Reservoir Model Net gross: NTGGrid 3D Grid BASECASE GENTLE 270612 Sat. water: SW_LAMBDA_BBBInput XY unit m Sat. gas: 1‐Sw‐SoInput Z unit m Bg (formation vol. factor): 0.631 [RB/MSCF]
Case Bulk volume[*109 rm3] Net volume[*109 rm3] Pore volume[*109 rm3] HCPV[*109 rm3] GIIP[TSCF]BaseCaseGENTLE 5.151 4.883 0.848 0.775 7.726
ZonesZone TC 0.011 0.011 0.003 0.003 0.027Zone 1 0.108 0.108 0.031 0.029 0.292Zone 2 0.376 0.376 0.096 0.090 0.896Zone 3 0.993 0.993 0.209 0.191 1.901Zone 4 0.780 0.780 0.158 0.148 1.471Zone 5 1.132 1.132 0.175 0.159 1.590Zone 6 0.929 0.743 0.084 0.073 0.726Zone 7 0.781 0.703 0.089 0.080 0.793Zone 8 0.040 0.036 0.004 0.003 0.031
Case name Bulk volume[*109 rm3] Net volume[*109 rm3] Pore volume[*109 rm3] HCPV[*109 rm3] GIIP[TSCF]Extremely High 5.748 5.471 1.083 1.009 10.061HighCaseSTEEP 5.748 5.471 0.979 0.893 8.897HighCaseGENTLE 5.749 5.390 0.884 0.810 8.073HighCaseFLAT 5.749 5.357 0.827 0.758 7.553BaseCaseSTEEP 5.152 4.956 0.914 0.833 8.305BaseCaseGENTLE 5.151 4.883 0.848 0.775 7.726BaseCaseFLAT 5.151 4.832 0.786 0.720 7.180LowCaseSTEEP 4.262 4.109 0.775 0.703 7.012LowCaseGENTLE 4.262 4.067 0.724 0.661 6.585LowCaseFLAT 4.261 4.032 0.686 0.627 6.247Extremely Low 4.261 4.032 0.609 0.549 5.470
Deterministic Volumetric
GIIP w/o Inert[TSCF]7.8486.9406.2975.8916.4786.0265.6005.4695.1364.8734.267
Uncertainty Analysis
Uncertainty Analysis
Probability Realization GWC Porosity Water Saturation GIIP[TSCF] GIIP w/o Inert (TSCF)
P1 5 ‐3095 PHIT_SGS_Hi SW_LAMBDA_HHH 10.061 7.848
P10 11 ‐3035 PHIT_SGS_Base SW_LAMBDA_HBB 8.991 7.013
P41 10 ‐3035 PHIT_SGS_Base SW_LAMBDA_BBB 7.726 6.026
P50 5 ‐3095 PHIT_SGS_Hi SW_LAMBDA_HHH 7.451 5.812
P90 27 ‐3032 PHIT_SGS_Lo SW_LAMBDA_LLL 6.245 4.871
P99 27 ‐3032 PHIT_SGS_Lo SW_LAMBDA_LLL 5.470 4.267