1Structural interpretationFundamentals of Seismic Interpretation

pSeismic stratigraphy

Seismic inversion interpretation

Interpretation of Deltaic environmentSeismic amplitude

Reservoir interpretationSeismic interpretation inSeismic interpretation in Carbonates

Interpretational Framework for exploration objectivesSeismic Interpretation in Reservoir Evaluation

REGIONAL GEOLOGICAL SETUP EXPLORATION, DEVELOPMENT AND

PRODUCTION HISTORIES STRUCTURAL INTERPRETATION SAND DISTRIBUTION

HYDROCARBON SAND DISTRIBUTION HYDROCARBON SAND DISTRIBUTION OIL AND GAS SANDS RESERVOIR DISTRIBUTION

2 Knowledge in fundamental of reservoir interpretation

Skill in recognition of reservoir sands in seismic section

Aware of significance of amplitude analysis in reservoir interpretationreservoir interpretation

Knowledge in reservoir mapping

Offshore Oil &Gas Field18 Wells2D/3D Seismic

I FieldI Field

Example from Example from Offshore Offshore Oil&Gas Field in Oil&Gas Field in JapanJapan

Japan Sea

5 km

Japan Sea

3Offshore Oil &Gas Field

Well log dataWell core data2D/3D Seismic data

Outcrops

Well log data2D Seismic data

5 kmAlluvial plain High land

Onshore Oil &Gas Fields

2D Seismic data

EISTO

CENE

N

age Reservoir Unit3rd order 4th order foraminifera

II II I IIVV

No.1 Grt. in flata bed

?

5th

orde

r

Form

atio

n

0.90

(Ma)

0.95

1.00

1.05

0.85

0.80

Sequence Division

PLE

NIS

HIY

AMA

FOR

MAT

ION

N3N4N5N6N7N8

m.f.s.

CEN

E

No.2 Grt. in flata bed

N9I

Marker ASB

1.4Ma

SB2 9M2.85

2.55

2.25

1.95

1.75

1.45

1.151.1Ma

? ?

A SandSequenceN

SHIIY

A FO

RM

ATI

ON

N1N2

m.f.s.

PLIOC

S1S2S3S4S5

?

No.3 Grt. in flata bed

SB

SB

3.56 Ma

2.9Ma

Orbulina

?

3.15

3.45

Grt. ikebei bed

mixed fauna

?

B Sandq

Stratigraphy

Modified after Takano et al.(2001)

4LEGENDSystems tract

SequenceDepth

I

III630

840

Systems TractFormation SequenceDepth

N8

I

II

1227

890

754

N9

III

1102

1005

Systems Tract SequenceDepth

N8

II

III

IN9

Systems Tract

632

795

910978 940

N9

N8

I

Transgressive Systems Tract

Highstand Systems Tract

Lithology

Sandstone

Sandy Alternation

Muddy Alternation

1205

2170

1592

1310

N1

N2

N3

N4

N6

N7

2376

2178

1908

1763

1485

1633

1360

N1

N2

N3

N5

N6

N71122

1240

1350

1505

2010

N5

1670N4

1762

1080N7

N6

1432N5

N4

1715N3

N2

N1

Lowstand Systems Tract

a

Lowstand Systems TractLowstand Systems Tract

a

b

Alternation

Silt - Mudstone

Sandy Siltstone

2345

slope to basin floor

outer fan

channel-levee (channel interchannel mound)

mid-fan lobe

mid fan channel

Facies cross sectionFacies cross section

StructuralHigh

Trap

HighPinching out

Base of Formation

5NESW

Expecting New Reserves

Reservoirs Profile

19681968--1982 G&G Survey and Study1982 G&G Survey and Study

1985 3D Seismic Survey1985 3D Seismic Survey

12D

19581958--1965 1965 G&G Survey and StudyG&G Survey and Study 1966 Wells 1, 2D1966 Wells 1, 2D

19831983--1984 Wells A1984 Wells A--1,1,--2,2,--3,3,--44

1986 G&G, Economical Evaluation1986 G&G, Economical Evaluation 19901990--1992 Development Wells 1992 Development Wells 19931993--1999 G&G Study1999 G&G Study

A-5

MigrationMigration A-1A-2

A-3

A-4

B-1

B-2

B-3B-4

B-5

B-6

B-7B-8

B-9

B-10

19991999--2000 3D data Reprocessing2000 3D data Reprocessing

2001 Well A2001 Well A--6 6 2000 Well A2000 Well A--55

AVO AVO Coherence Coherence Acoustic ImpedanceAcoustic Impedance

2002 3D Seismic Survey2002 3D Seismic Survey

2 km

A-6Acoustic ImpedanceAcoustic Impedance

The history of exploration and development

6Geological dataGeophysical data Production data

Geological analysis and interpretation

Petrophysical data

Geophysical analysis and interpretation

Geophysical and geological knowledgeconstrained model

and interpretation

Petrophysical analysis

Reservoir flow simulation

Petrophysical knowledgeconstrained reservoir model

Reservoir Evaluation Flow

Structure

Sand Distribution

Hydrocarbon Distribution

ReservoirReservoir Distribution &

Volumetric

Reservoir Details

7Reservoir Evaluation Flow for I field

Structure

Structural Interpretation Oil Reservoir Gas Reservoir

Seismic Faciesand Unit Interpretation

Amplitude Interpretation and Mapping

Sand Distribution

Hydrocarbon Distribution

Reservoir

Amplitude Interpretation and Mapping

A ti I d I t t ti A ti I d I t t ti

High Resolution AVO Analysisfor Gas Sand

Stochastic ApproachNeural Network Approach

High Resolution AVO Analysisfor Porous Sand

Stochastic ApproachNeural Network Approach

Reservoir Distribution &

Volumetric

Reservoir Details

Acoustic Impedance Interpretation and Analysis

Acoustic Impedance Interpretationand Analysis for Gas Sand

I field : view from a Seismic Interpretation software

8Result of seismic interpretation : Displayed a shaded time surface with contours

Amplitude map of the gas sand

9Amplitude in B bed (zoomed in)

CPS-3 : Mapping GeoViz : Visualization

IESX : Seismic Interpretation

Software Integration : GeoFrame Application Manager

10

Well locations and borehole direction

Gas reservoir

SPGR ResistivityDT

Conductivity

Well logs/curves from a particular well location : result after drilling

Gas reservoir intervalsof A sand

11

GG--1 : SYNTHETIC SEISMOGRAM1 : SYNTHETIC SEISMOGRAM

J16

J19/20

J15

J18

A sand base

12

Horizon picking

Migration volumeSeismic data

Well control

Work with Amplitude(Approaches for gas reservoir)

Amplitude ExtractionAlong horizon

Structure mapping

Work Flow

Amplitude mapping

Interpretation of reservoir distribution

: Interpretation or analyzing

Horizon picking

Migration volumeSeismic data

Well control

Work with Amplitude(Approaches for gas reservoir)

Amplitude ExtractionAlong horizon

Structure mapping

Work Flow

Amplitude mapping

Interpretation of reservoir distribution

13