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Imaging Sand Distribution From Acoustic Impedance Suphan Buri Basin, Central Thailand. 1. 2. Ronghe, S., and Surarat, K. 1. Dept. Petroleum Geoscience, Universiti Brunei Darussalam. PTT Exploration and Production PCL., Bangkok, Thailand. 2. CONTENTS. Study objectives

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slide1

Imaging Sand Distribution From Acoustic Impedance

Suphan Buri Basin,

Central Thailand.

1

2

Ronghe, S., and Surarat, K.

1

Dept. Petroleum Geoscience, Universiti Brunei Darussalam.

PTT Exploration and Production PCL., Bangkok, Thailand.

2

slide2

CONTENTS

  • Study objectives
  • Location and geology
  • Wireline analysis
  • Well to seismic correlation
  • Seismic attribute analysis
  • Inverse modeling
  • Results and interpretation
  • Conclusions
  • Acknowledgements
slide3

STUDY OBJECTIVES

  • To determine the potential of wireline and seismic
  • as a discriminator of formation lithology / fluid.
  • To apply the seismic inversion to image depositional
  • succession
slide4

N

STUDY LOCATION

Phitsanulok

Basin

THAILAND

Mae Ping Fault Zone

Sing Buri

Basin

Suphan Buri

Basin

STUDY

AREA

Ayuthaya

Basin

Kamphaeng

Saen Basin

Sala Daeng

Basin

Three Pagodas

Fault Zone

BANGKOK

30 km

Adapted from O’Leary and Hill (1989)

slide5

Schematic stratigraphic sequence, Suphan Buri Basin

Age

Unit

Depth

Depositional system

Lithology

Petroleum system

500 -

m

Sands, gravels, siltstone & mudstone,

fluvial origin

E

Alluvial - Fluvial

Pliocene - Recent

U

D1

Fluvio-lacustrine sandstone, siltstone

interbedded with mudstone.

D2

1000 -

D3

Reservoirs

Upper

D4

D

D5

Fluvial channel sandstone and

conglomeratic sandstone.

D6

Fluvio- lacustrine

Miocene

Source and

Reservoirs

Mid

D7

U

C1

1500 -

Intercalated sandstone, siltstone & mudstone.

Lacustrine system with fluvial influence.

C2

C

Lower

C3

Source

C4

B

Lacustrine

Mudstone with minor siltstone.

Source

Oligocene

Early basin fill

Alluvial - lacustrine

Conglomerate, sandstone interbedded

with siltstone and minor mudstone.

Source and

Reservoirs

2000 -

A

Basement complex: clastics,

carbonate rocks or metasediments.

Pre Tertiary

Adapted from Intharawijitr (1993)

slide6

TWT STRUCTURAL MAP

UT1-7/D2

UT1-7

UT1-3/D1

UT1-3

N

1 Km

Time

(ms)

Horizon D3

Time structure

map

560

630

700

770

840

910

980

1059

Area = 37 sq. km.

slide7

Well UT1-7

Well UT1-3

GR

AI

GR

AI

Sub-unit D1

Sub-unit D2

Wireline cross-plots

Above OWC

m

TVD

Sub-unit D3

m

TVD

OWC

OWC

Sub-unit D4

Wireline cross-plots

Below OWC

Sub-unit D5

Sub-unit D6

slide8

CONTENTS

  • Study objectives
  • Location and geology
  • Wireline analysis
  • Well to seismic correlation
  • Seismic attribute analysis
  • Inverse modeling
  • Results and interpretation
  • Conclusions
  • Acknowledgements
slide9

Wireline cross-plot: Below OWC

UT1-3

High

AI

GR

Shale

Gamma ray (API)

Shaly-sand

Sand

Low

Impedance (g/cc * m/s)

slide10

Wireline cross-plot: Below OWC

UT1-3

LLD

GR

Gamma ray (API)

Resistivity (ohm / m)

slide11

Wireline cross-plot: Above OWC

UT1-7

High

AI

GR

Shale

Gamma ray (API)

Shaly-sand

Sand

Low

Impedance (g/cc * m/s)

slide12

Wireline cross-plot: Above OWC

UT1-7

LLD

GR

Gamma ray (API)

Resistivity (ohm / m)

slide13

WELL TO SEISMIC CORRELATION

Seismic

Synthetic

Impedance (g/cc*m/s)

Synthetic

Wavelet

slide14

CONTENTS

  • Study objectives
  • Location and geology
  • Wireline analysis
  • Well to seismic correlation
  • Seismic attribute analysis
  • Inverse modeling
  • Results and interpretation
  • Conclusions
  • Acknowledgements
slide17

Well UT1-7

Well UT1-3

GR

AI

GR

AI

Sub-unit D1

Sub-unit D2

Wireline cross-plots

Above OWC

m

TVD

Sub-unit D3

m

TVD

OWC

OWC

Sub-unit D4

Wireline cross-plots

Below OWC

Sub-unit D5

Sub-unit D6

slide18

CONTENTS

  • Study objectives
  • Location and geology
  • Wireline analysis
  • Well to seismic correlation
  • Seismic attribute analysis
  • Inverse modeling
  • Results and interpretation
  • Conclusions
  • Acknowledgements
slide19

INVERSE MODELLING FLOWCHART

WAVELETS SEISMIC LOGS TOPS HORIZONS FAULTS

AI

Constraints

AI

Interpolation

Solid earth model

CSSI

AI model

Impedance

(mid frequency)

Impedance

(low frequency)

Trace merge

Final AI result

slide20

IMPEDANCE TREND AND CONSTRAINTS

Well SK-1

Trend

Constraints

AI log

slide22

18m

12m

20m

INVERSE MODELING RESULT

slide23

Impedance

(g/cc * m/s)

Sub-unit D6

Sub-unit D5

Impedance

(g/cc * m/s)

10000

Maximum

impedance

distribution

Maximum

impedance

distribution

9500

10500

10000

11000

10500

11500

11000

12000

11500

12500

SAND

12000

UT1-7/D2

UT1-7/D2

13000

SAND

12500

UT1-7

UT1-7

13500

13000

UT1-3/D1

UT1-3/D1

UT1-3

UT1-3

13500

N

N

1 Km

1 Km

slide24

Sub-unit D3

Sub-unit D4

Impedance

(g/cc * m/s)

Impedance

(g/cc * m/s)

Maximum

impedance

distribution

Maximum

impedance

distribution

9000

9000

9500

9500

10000

10000

10500

10500

11000

11000

11500

11500

UT1-7/D2

UT1-7/D2

SAND

SAND

12000

UT1-7

UT1-7

12000

UT1-3/D1

UT1-3/D1

12500

12500

UT1-3

UT1-3

13000

13000

N

N

1 Km

1 Km

slide25

Generalized rift structure and sedimentation patterns

DELTAIC / FLUVIAL

Sandstone + mudstone

Fan in footwall

transfer zone

ALLUVIAL FAN / FAN DELTA

Conglomerate + sandstone

(Modified from Leeder and Gawthorpe 1987)

slide26

Sub-unit D5

Sub-unit D6

LEGEND

Impedance

Interpretation

Impedance

Interpretation

Shale

Sand

Transport

direction

Fan / slump

Delta lobe

Feeder canyon

FS

FC

FS

FS

DL

FS

FC

N

N

DL

DL

1 Km

1 Km

slide27

BF

Sub-unit D4

Sub-unit D3

BF

LEGEND

Impedance

Interpretation

Impedance

Interpretation

Shale

Sand

Transport

direction

Fan / slump

Delta lobe

Channel

Basinfloor fan

C

FC

C

FS

DL

FS

FS

C

BF

N

N

DL

DL

1 Km

1 Km

slide28

SUMMARY GEOLOGICAL MODEL OF THE STUDY AREA

Fault linkage

Remnant

relay ramp

Minimum

displ.

Maximum

displacement

Maximum displacement

Fan or

slump

Feeder canyons

Axial delta lobe

Axial channel

0

1.5

Basinfloor

fans

Km

N

slide29

CONCLUSIONS (1)

  • Wireline impedance and seismic attributes responded primarily
  • to lithology.
  • Inverse modeling resulted in good comparison between
  • wireline impedance and adjacent derived impedance traces,
  • and enabled vertical sand resolution of about 12 m.
  • Maximum impedance extractions imaged two styles of sand
  • distribution: axial and boundary fault induced deposits.
slide30

CONCLUSIONS (2)

  • Axial deposits (delta lobes, channels and basinfloor fans)
  • prograded from south to north downdip into the basin.
  • Boundary fault induced deposits (fans / slumps and feeder canyons)
  • showed two component pathways:
    • Fans / slumps were transported perpendicular to the fault.
    • Feeder canyons transported sediment downslope to the NE.
  • The basin architecture and sedimentation patterns agree with
  • published general models of rift geology.
slide31

ACKNOWLEDGEMENTS

  • PTT Exploration and Production Public Co. Ltd.
  • for data & permission to present the results.
  • Jason Geosystems and Landmark Graphic Corp.
  • for software donation to the Department of
  • Petroleum Geoscience, UBD.
  • Jason Geosystems for technical support and review
  • of this study.
slide32

PRESENTATION OVERVIEW

Acoustic impedance is used to map the locations and shapes of sand bodies deposited within a producing fluvio-lacustrine interval of a continental half graben basin.