SEISMIK STRATIGRAFI

DATA SEISMIK

- SAMPLING- HORISONTAL- BAWAH PERMUKAAN

Di proses & di evaluasi

DETAIL

SEISMIK STRATIGRAFI

- KORELASI- DISTRIBUSI STRATIGRAFI

INFORMASI

ANTARSUMURBOR

DATASEISMIK

Kalibrasi DATA :SUMUR BOR(Log)(Core)(Biostratigrafi)SEISMIK

STARTIGRAFIDETAIL

SIKUENSTRATIGRAFI

SEISMIK STRATIGRAFI :ADALAH SUATU DISIPLIN ILMU YANG BERKAITANDENGAN PENENTUAN HUBUNGAN LITOLOGI DANSTRATIGRAFI BAWAH PERMUKAAN YANG DIPEROLEHDARI DATA SEISMIK REFLEKSI

AHLI SEISMIK STRATIGRAFI :

1. Seismik fisika, Acquisition, Processing2. Prinsip-prinsip Startigrafi/Struktur dan

Proses-proses sedimentasi3. Pengukuran-pengukuran sumur bor

dan analisa well-log

Mempunyai kemampuandan pengalaman

FASIES SEISMIK :

Adalah kumpulan refleksi seismikyang sifat-sifatnya berbeda dengankumpulan refleksi seismik lainyang berdekatan dengannya

METODA INTERPRETASISEISMIK STRATIGRAFI1. PENENTUAN FASIES SEISMIK

Berdasarkan :- Konfigurasi- Kontinuitas- Amplitudo / phase attributes

2. SELEKSI KANDIDAT BATAS SIKUEN (SB) DANBATAS SYSTEM TRACTBerdasarkan :

- Gambaran Refleksi- Terminasi

+ data pemboran,+ biostratigrafi+ geokimia

SIFAT-SIFAT REFLEKSISEISMIK :

- KONFIGURASI- AMPLITUDO- KONTINUITAS- FREKUENSI- INTERVAL VELOCITAS

KRITERIA-KRITERIA UNTUK MEMBEDAKAN TIPE-TIPE TERMINASI REFLEKSI YANG BERASOSIASI :

1.BATAS-BATAS SATUAN :(toplap, onlap, offlap, downlap, truncation, internalconvergence)

2. GAMBARAN POLA REFLEKSI DI DALAM SATUAN :( paralel, subparalel, chaotic, sigmoidal, oblique,divergent)

3.BENTUK LUAR / BENTUK GEOMETRIS DARISATUAN-SATUANNYA :(sheet, wedge, lens, mound, bank)

UPPER LIMIT OFTHE SEQUENCE

(Top Interval)

LOWER LIMIT OFTHE SEQUENCE

(Base Interval)

INTERNAL CONFIGURATION(Contained)

CODIFICATION

A - BC

On - onlapDow - downlapC - concordantO - oblique

M - moundedOb - obliqueSig - sigmoidalRf - reflection free

Te erosional truncatureTt toplap truncatureC concordant

P - paralelD - divergentC - chaoticW - wavy

TIPE-TIPE TERMINASI REFLEKSI

UPPER BAONG

LOWERKEUTAPANG ?

UBSh

MBS 2

Time Depth Curve - Telaga A1

INTERPRETASI SEISMIK-X Line 85AR-414 (2)

INTERPRETASI SEISMIK-In Line 85AR-405 (3)

UPPER BAONG

LOWERKEUTAPANG ?

PROP WELLEDB-1projected

INTERPRETASI SEISMIK-X Line 90AR-516 (4)

LOWERKEUTAPANG ?

UPPER BAONG

PROP WELLEDB-1projected

INTERPRETASI SEISMIK 90AR-497 (5)

UPPER BAONG

LOWERKEUTAPANG ?

PROP WELLEDB-1projected

12101

10771

9441

8111

6781

5431

4051

2701

1361

11

NP90AR-495 NP85AR-401NP90AR-499

TRACELINE

0

-200

-400

-600

-800

-1000

-1200

-1400

-1600

-1800

-2000

-2200

-2400

-2600

BARAT DAYA TIMUR LAUT

Konsep Pola Struktur & Horison(Case: Line 85ar-408)

Reflection Geometries:Stratal Terminations at Sequence Boundaries

Stratal Termination Patterns

Stratal patterns in a type-1 sequence (the fall in relative sea level to the lowstandshoreline induces significant erosion on the newly exposed sea floor).

Stratal patterns in a type-2 sequence (there is no fall in relative sea level at the lowstand shoreline andsignificant erosion does not occur). The lowstand systems tract is replaced by the shelf margin systemstract, and the sequence boundary is located where the stacking pattern changes from progradational toaggradational.

Profiles across the Brae andMiller Fields,North Sea.(a) Seismic profile and(b) schematic cross-section.

(After W eimer and Link.,1999)

Stratal Geometries

LST Prog.Complex

Top-DwnS

GrowthFault

6700 ft

500

ms

LR-7

Louann Salt

T/ Sligo Formation

SB 20

SB 30

SB 40

SB 50

Stratal Geometries

6700 ft

T/ Sligo Formation

SB 20

SB 30

SB 40

SB 50

Top-Dwn?S

TSTBuildup

TSTBuildup

LST Prog.Complex

Stratal Geometries

6700 ft

Retrogradation

Buildup

GrainstoneBelt

Thinning overmargin

LR-8C

SB 20SB 30

SB 40

SB 50T/ Sligo Formation

C/Top-DM

Top-DwnO

C-DwnP

PARAMETER REFLEKSI DAN ARTI GEOLOGINYA( Mitchum dkk,1977)

Seismic facies parameter Geologic interpretationREFLECTION CONFIGURATION -BEDDING PATTERNS

-DEPOSITIONAL PROCESSES-EROSIONAL & PALEOGEOGRAPHY-FLUID CONTACTS

REFLECTION CONTINUITY -BEDDING CONTINUITY-DEPOSITIONAL PROCESSES

REFLECTION AMPLITUDO -VELOCITY DENSITY CONTRAST-BED SPACING-FLUID CONTENT

REFLECTION FREQUENCY -BED THICKNESS-FLUID CONTENT

INTERVAL VELOCITY -ESTIMATION OF LITHOLOGY-ESTIMATION OF POROSITY-FLUID CONTENT

EXTERNAL FORM & AREAL ASSOCIATION OFSEISMIC FACIES UNITS

-GROSS DEPOSITIONAL ENVIRONMENT-SEDIMENT SOURCE-GEOLOGIC SETTING