cbm exploration
TRANSCRIPT
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LST_ABF
TST_ABFHST_ABF
LST_MEF TST_MEF
Seismic Stratigrafi Facies _Muara Enim
Seismic Reflection Current
Bagaskara Roshardwiadi.ST 1
Downlap
Onlap
Toplap
Erotional
Truncation
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1st Section
Repeated Section
Different Trend Fault Syn ABF &
Syn MEF
ABF
MEF
Seismic Line Before Reprocessing
Basic Parameter Control1. Reflection Curent Termination.
Downlap Onlap
Toplap
Erotional Truncation
2. Similarity Simple/Single Amplitude
3. Similarity Combination Amplitude
Ex : Simple/ Single Amplitude Phase
Onlap
Downnlap
Toplap
Bagaskara Roshardwiadi.ST 2
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Understanding The Object
Main Subject
CBM Exploration
Target / Purpose Find Coal Existence.
Type of Coal Layer Laterally.
Wheres & What Coal
Formed & the Other Interest
Zone; Such As : Oil & Gas
Whats the Relation with
Quality And Type of Coal or
Kerogen.
Isopach Map
Volumetric
Objective Corelation Interval
Top FormationInt MEF
BottomTop GUF
Best Quality Seg-Y in TopABFInt MEF.
Maks Recorded Log Comp
Top ABFInt MEF Except
Cinta_Bagas_1.
Mostly Seg Y Need to
Reprocessing.
Bagaskara Roshardwiadi.ST 3
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Bagaskara Roshardwiadi.ST 4
LQC Cinta Bagas_1
GR & SP have good relevant shape whichs reflected
Subsurface condition; Rmf < Rw :
Permeable Curve GR & SP ; ( - ) Non Permeable Curve GR & SP ; ( + )
Resistivity Curve Have good Shape and can use for
Interpretation ; MSFL > LLS > LLD. Wheres HC
Bearing ; LLD > LLS >MSFL.
Coal Bearing High Resistivity.
Porosity Curve have a good and relevant value to
Describe subsurface condition.
Neutron 50 PU Sd 60 PU Coal Bearing ( CBM )
0 PU Sd 10 PU Carbonate ( Lime,Dolo,Anh)
Densitas 1.3 gr/cc Sd 1.7 gr/cc Coal Bearing ( CBM )
2.7 gr/cc Sd 3.0 gr/cc Carbonate ( LDA )
Pef ; Montmorilionite dominantly in delta Front Env.
Glouconite Abundant , Mixed , Some Illite in
Marine Env.
Carbonate dominantly in Shallow MarineMixed Clay minerall, And Sand Feldsphatic in
Delta Tide.
Depth Matching ; less than 1 feet
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Interest Zone @ Cinta Bagas_1
Quick Look Analysis IntInterest Interval @ MEFInt MEF
Coal_1 : 876.25 m - 869.90 m ( MD )Mainly Vitrinite, < 20% exinite, Black, Blck Streak, Britlle,
Concoidal - Uneven, Medium Ash, Medium Sulfur, Contain
Resin & Pyrite, Clay Mineral Kaolinite. Lower Delta Env,
Marsh Facies.
Coal_2 : 851.44 m - 840.71 m ( MD )
Mainly Vitrinite, < 20% exinite, Black, Blck Streak, Britlle,
Concoidal - Uneven, Medium Ash, Medium Sulfur, Contain
Resin & Pyrite, Clay Mineral Kaolinite. Lower DeltaDeltaFront Env,Marsh Facies
Coal_3 : 818.39 m - 807.49 m ( MD )
Mainly Vitrinite, < 20% exinite, Black, Blck Streak, Britlle,
Concoidal - Uneven, Medium Ash, Medium Sulfur, Contain
Resin & Pyrite, Clay Mineral Kaolinite. Lower DeltaDelta
Front Env,Marsh Facies
HC_1 : 951.19 m - 953.63 m ( MD )SS, MediumFine, sub Angular- Rounded, RippleCrossbed,
Quartz Mineral, IB silty Sandstone with clay mineral mont.
Point Bar Facies in Lower Delta.
HC_2 : 954.88 m - 956.72 m ( MD )
SS, MediumFine, sub Angular- Rounded, Ripplecrossbed,
Quartz Mineral, IB silty Sandstone with clay mineral mont,
Point Bar Facies in Lower delta.
Bagaskara Roshardwiadi.ST 5
Point Bar
Levee
Marsh
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Interest Zone @ Cinta Bagas_1
Lower Delta
Gas Bearing
Coal Bearing
Coal Bearing
Bagaskara Roshardwiadi.ST 6
Point Bar
Levee
Marsh
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Interest Zone @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 7
Interest Interval @ ABF Thin coal Layer near in top ABF deposit in dist.
Mouth Bar delta front env .
Coal
Bearing
Coal
Bearing
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Interest Zone @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 8
Interest Zone @ BRF : 1834.33 m - 1968.00 m ( MD )Indicated based on Curve Shape with Ignoring Env Hole.
No Cutting Report of Oil ShowInt_Zone _1 : 1851.41 m - 1852.62 m
Silty Sand, Calcareous, WavyLaminated, Rounded ,Carb,Glouconite, Some Clay mineral Chlorite., Carbonat Slope Facies in
Shallow Marine
Int_Zone _2 : 1853.07 m - 1854.50 m
LimeStone, Fossil Abundant, Glouconite, Carb. Slope Facies n Shallow
Marine.
Int_Zone _3 : 1855.71 m - 1857.81 m
Limestone IB with Slty sandshale , Fosil abundant, Clay mineral
chlorite & glouconite, Carbonat Slope in
Shallow Marine.
Int_Zone _4 : 1861.35 m - 1865.33 m
Limestone IB with Slty sandshale , Fosil abundant, Clay mineral
chlorite & glouconite, Carbonat Slope in
Shallow Marine.Int_Zone _5 : 1904.57 m - 1906.35 m
Sand, Calcareous, WavyLaminated, Rounded, Carb, Glouconite,
some Clay mineral Chlorite , Carbonat Slope Facies in Shallow Marine
Int_Zone _6 : 1909.17 m - 1912.34 m
Sand, Calcareous, WavyLaminated, Rounded, Carb, Glouconite,
Some Clay mineral Chlorite.
Carbonat Slope Facies in Shallow Marine
Int_Zone _7 : 1914.80 m - 1916.23 m
Limestone IB with Slty sandshale , Fosil abundant, Clay mineral
chlorite & glouconite, Carbonat Slope in
Shallow Marine.
Int_Zone _8 : 1916.81 m - 1919.07 m
Limestone IB with Slty sandshale , Fosil abundant, Clay mineral
chlorite & glouconite, Carbonat Slope in Shallow Marine.
Int_Zone _9 : 1922.01 m - 1925.17 m
Limestone IB with Slty sandshale , Fosil abundant, Clay mineral
chlorih & glouconite, Carbonat Slope in Shallow Marine.
Int_Zone _10: 1928.73 m - 1935.09 m Same with zone 2Int_Zone _11: 1939.84 m - 1946.60 m Same with zone 2Int_Zone _12: 1951.34 m - 1954.38 m Same with zone 2
Sand, Calcareous, WavyLaminated, Rounded, Carb, Glouconite,
Some Clay mineral Chlorite. Carbonat Slope Facies in Shallow Marine
Salinity Changes
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Bagaskara Roshardwiadi.ST 9
Gas bearing
Gas Bearing in
Sand Calc
Approx Gas
Interest Zone @ Cinta Bagas_1
Rmf < Rw
Rdeep > RMicro
Rmf < Rw
Rdeep > RMicro
Gas bearing
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Interest_Zone @ GUF Cinta_Bagas_1 ; 1053.41 m - 1846.30 m ( Md )Int Zone_1 : 1500.95 m - 1501.51 m
Shale, Clcrs, Chlrt Min, Glouconite, Tidal chanell in
Delta Front Facies.
Int Zone_2 : 1550.97 m - 1551.53 m
Shale, Clcrs, Chlrt Min, Glouconite, Transgresive Shelf in
Marine Facies.
Int Zone_3 : 1635.42 m - 1636.05 m
SandSilty Sand , FineVery Fine, Rounded, Good
Sorted, X bedRipple , MontmorilioniteIllite clay
mineral, Tidal Chanel in Delta Front Tide Env.
Int Zone_4 : 1635.42 m - 1636.05 m
Silty sand , VeryFine,, Rounded, Good Sorted, X bed -
Ripple, Lenticular, some Chlorite & Glouconite, Mixed
Flat in Tidal Flat Delta Front Tide Facies Env.
Int Zone_5 : Silty sand , VeryFine,, Rounded, Good Sorted, Wavy -Laminated, Lenticular, some Chlorite &
Glouconite,Transgresive Shelf Facies Marine Env.
Int Zone_6 : Silty sand , VeryFine,, Rounded, Good Sorted, Wavy -
Laminated, Lenticular, some Chlorite &
Glouconite,Transgresive Shelf Facies Marine Env
Interest Zone @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 10
Interest Interval based on Curve Shape & Ignore Env
Also Correction.
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Interest Zone @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 11
Tidal FaciesApp Gas
Bearing
Transgresive
Facies
Gas Bearing
Gas Bearing
Gas Bearing
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Interest Zone @ Cinta Bagas_1
App Gas
Bearing
Stream delta
Tide
FS Event
Bagaskara Roshardwiadi.ST 13
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 14
AI = x V , RC = 2 x V2 / 1 x V1
Low AI = Zone Porous = Possibility HC + Water in Bulk Volume
HC = Oil & GasFausts Relationship
1,000,000
2000(Dpt1/6)(3.2808R)1/6
Dpt = TVD depth in feet
below ground level (onshore)
or below seabed (offshore).
R = resistivity in ohmm.
Gardners Relationship1,000,000
4.347826Den4
Den = density in gm/cm3.
Correlation Sythetic phase 85 with Log for Interest Interval Ignoring Washed Out
Coal
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 15
Int.zone
Int.zone
Wash Out
Int.zone
Int.zone
Int.zone
Int.zone Coal
Coal
Coal
App Gas
App Gas
App Gas
Correlation by Syn. Seis using pseudo well ( up ) will have
maksimum Picking to help Interpretation Fault & Horizon
adjusting trace by trace correlation with similarity amplitude (
bottom) even get structure detail but picking just the main line
well by well interpolation nearest trace ( MEF).quiet enough.
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 16
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Bagaskara Roshardwiadi.ST 17
Well Seismic @ Cinta Bagas_1
Washed Out Caused
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 18
Strong Gain Amplitude
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Bagaskara Roshardwiadi.ST 19
Well Seismic @ Cinta Bagas_1
No IndicationTight Formation
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 20
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Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 21
Log Evaluation
Quick Look
Result
Coring, Cutting, FMI, Dip
MeterSeismicVelocity
Simply General Lithology +HC Bearing
Porous Zone
Interest Interval
Detail Lithology, O&GShow, GC Analysis, etc
Interest Interval Interest Interval
Final Result
Simply Quick Look Analysis Flow Chart
Correlated Correlated
CorrelatedCorrelated
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Initial Stage or Preidentification Phase for Syn & Log Quick Look Analysis. MEF Interest Interval divided into 4 interval according to curve shape ignore env.hole &
Correction tool, wheres deposit in pointbar facies thats contain gas bearing according to x-plot
NPHIRHOB ( Page 6 ) and the interest interval in top is Coal Bearing theres 3 interval deposit in
levee to marsh lower delta env. Synthetic Seis wheres have AI calculation and RC calculation with
phase 85 theres similar interval that show peak amplitudo for interest interval.
ABF according to curve shape theres decreasing neutron porosity with small interval that possibilty
cause by washed out, according to x-plot no indication of HC bearing except in near top ABF theres
coal thin layer. Sythethic Seismogram showed theres 3 interval of porous zone deposit in Stream
mouth bar and Clastic Slope Fill.
GUF according to synthetic Seismogram show porous zone theres 7 interval and log analysis
Quick Look theres 7 interval decreasing porosity neutron , some interval might cause by washed
out. Based on X plot NPHI-RHOB & PEF-RHOB theres 2 interval Show indication of Gas Bearing
in Tidal ChanelTransgresive Shelf in Delta FrontMarine Env.
Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 22
Conclusion
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BRF according to Syn. Seismogram theres only one interval porous zone and Quick Look Analysis
have 12 interval possibillity layer contain HC or water that might caused by enlargement of hole or
salinity changes in some interval. X plot NPHI-RHOB indication of Gas bearing showed in 1851 m
1906 m ( MD ) near on top BRF Carbonat Slope Facies in Shallow Marine Env.
TAF which is deposit in Delta Front Env based on Synthetic Seismogram theres one interval near on
top TAF , X-plot NPHI_RHOB no Indication showed HC, X Plot PEF_RHOB have several floating
point in interest interval thats indicated gas bearing.
Succesion Vertical divided into 3 System Tract in TAF at lower as 1 st Sedimentation event in Delta
Front Tide Environment chanell fill facies as LST - Stream Mouth Bar Facies as TST Dist
Mouth Bar facies as HST. BRF formed in Shallow Marine environment Carbonat Slope Facies, GUF
as a continuity sedimentation of BRF had two event 1st in Transgresive Shelf Facies in Marine Env
then Tidal chanell to Flat in Delta Front Tide Env. Then, ABF in Delta front Env with progradation
sedimentation dominantly showed with clastic Slope Fill Facies in 1st Sedimentation ABF --
Stream Mouth Bar - Dist Mouth Bar Facies. MEF formed Lower Delta Env with Point Bar Facies
-- Levee Facies -Marsh Facies.
Well Seismic @ Cinta Bagas_1
Bagaskara Roshardwiadi.ST 23
Conclusion
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Simple Schematic Well Design
Bagaskara Roshardwiadi.ST 24
MSL
GL
DF
TD Perforasi
Vertical Drilling
KB MD
TVD
TVDSS
Casing Shoe
Tubing
Kelly Bushing
Elevation Refference
Rod
1
4
3
21
2
3
4
5
5
Interest Interval
Jack Up Rig
Sea Level
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Simple Schematic Well Design
Bagaskara Roshardwiadi.ST 25
Packer
Perforasi
Tubing
Mud Line
Plugin In Hole
26
Plugin In Hole 17
1/2
Plugin In Hole 12
1/4
Plugin In Hole 8
1/2
Casing Size 20
Casing Size 13 3/8
Casing Size 9 5/8
Casing Size 5 1/2
Well Head
Blind Ram
Pipe Ram1
2
3
4
5
6
6
5
3
2
1
7
7
88
9
910
11
12
10
11
12
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Simple Schematic Well Design
Bagaskara Roshardwiadi.ST 26
Well Design
Well Head
Pipe Ram
Blind Ram
Bag Preventer
Mud return
Xmas Tree
Perforasi
Packer
Casing Shoe
Tubing
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1st Section
2nd Section Repeated
3rd Section Repeated
chanel proximalproximal
Seq. Dep
Transgresive Stand
Coal Bearing
88EO-017
Bagaskara Roshardwiadi.ST 27
chanel
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Bagaskara Roshardwiadi.ST
28
3rd Section Repeated
2nd Section Repeated
1st Section
90EO-006
28
C 2 C
Prox - Medial
Chanel
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88EO-017
LST
TST
HST
Chanell Meandering
Spliting Coal Bearing Pinch Out Coal Bearing
Bagaskara Roshardwiadi.ST 29
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30
Meandering Chanel
Cut Off
Slope
Stream Mouth
Bar
Bell Shape Patern w Interbedded
Characteristic Curve Patern P2M Chanell
90EO-006
Bagaskara Roshardwiadi.ST 30
Low System Tract
Transgresive Sytem
Tract
High Stand System TractSeqeunce
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31
88EO-025
Bagaskara Roshardwiadi.ST 31
1st Section
2nd Section Repeated
3rd Section Repeated
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32
1st Section
2nd Section Repeated
3rd Section Repeated
ChanellProx Prox
Bagaskara Roshardwiadi.ST 32
84PK-006
Chanell
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33
LST
TST
HST
LST
TST
HST
Large bell
Shaped
Medium
bell Shaped
Small bell
Shaped
1 Sequence
Sequence
84PK-006
Bagaskara Roshardwiadi.ST 33
Chanel Evolution
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LST
TST
HST
LST
TST
HST
s
e
q
u
e
n
c
e
s
e
q
Coal Bearing
TST
Coal Bearing
HST
LST
TST
HST
s
e
q
u
en
c
e
2 Seq
Seq
Straight
Chanel
Meandering
Chanel
Chanell Evolution
84PK-006
Bagaskara Roshardwiadi.ST 34
Abandoned
Chanell
Repeated Curve
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Downlap
Downlap +
Onlap
Downlap +
Toplap
Spliting Coal
Bearing
LST
TST
HST
Chanell Reflection
Properties
84PK-006
Bagaskara Roshardwiadi.ST 35
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3rd Section Repeated
2nd Section Repeated
1st Section
Chanell Prox Chanell ProxProx
ChanellProxAbandon ChanellProx Abandon Chanell
88KG-214
Bagaskara Roshardwiadi.ST 36
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Bagaskara Roshardwiadi.ST 37
88KG-214
Pseudo Well
Cinta Bagas_2
Characteristic M2D Chanell
Approx TF2TC
2Sequence
1Sequence
1/2Sequence
TST
LST
HST
LST
TST
HST
LST
TST
HST
TST
LST
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Bagaskara Roshardwiadi.ST 38
88KG-214
Braided Chanel tomedial chanell w Bell
Shaped Interbedded
Char,
Sily sand to Mud d w
Irregullar Shaped
Char, coal thin layer
existence
Mud Dominated
Funnell Shaped Char,
coal thin layer existence
Levee to Medial
Chanell w Bell Shaped
Interbedded Char,
Existence
Braided Chanell w
Irregullar Shaped
Char,
Sheet Sand w
Cylindrical Shaped
Char,
LST
TST
HST
Downlap
Onlap
Toplap
Chanell Reflection Properties
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88TS-03
Bagaskara Roshardwiadi.ST 39
1st Section
2nd Section Repeated
3rd Section Repeated
Chanell LeveeProxMedial
LST
TSTHST
Downlap
Onlap
Toplap
Spliting Coal
Bearing
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71TM_37A
B k R h d i di ST 40
3rd Section Repeated
2nd Section Repeated
1st Section