seismik stratigrafi
DESCRIPTION
seismik stratTRANSCRIPT
-
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