Geology of Pakistan’s Oil field
(khaskheli)
By
Roshni mir
Contents
Oil field
Oil fields of Pakistan
Lower Indus basin
Khaskheli oil field
Stratigraphy
Petroleum system
Seismic dip lines
Badin block exploration vs success chances
Oil fields
Oilfield is an area of land from where crude oil and natural gas is produced. Multiple oil wells
can be drilled in a single Oilfield
Oil fields of Pakistan
Fields Year
Khaskheli 1981
Laghari 1983
Tajedi 1984
Azari 1985
Liari 1986
Ghunghro 1988
paniro 1988
North akri 1988
Bari 1992
LOWER INDUS BASIN
Total area of lower indus basin is 873,000 square kilometers.
Sember (Cretaceous) and Ranikot (Paleocene) are main source
rock.
Environment of deposition of Sember and ranikot is marine
environment.
There are other known and potential source rocks. Permian
Dandot and Tredian Formations, Triassic Jurassic Datta
Formation, Eocene Ghazij Formation, lower Miocene shales.
In Kirthar Range mostly Pab sandstone is the reservoir.
Lower Goru Sands (Lower Cretaceous) are the main reservoir
for oil and gas.
Lower Goru Formation Upper sands and Basal sands are oil
bearing in more than 50 fields in the Badin area in the districts
Mirpurkhas, Hyderabad, Badin and Sanghar in Sindh Province.
Khaskheli oil field
The first oil discovery in lower indus basin of
Pakistan was khaskheli oil field
Field was discovered in the year 1981
Field is in the badin block of lower indus
basin
Badin block is the highest explored
platform of the lower indus basin
Stratigraphic column
SYSTEM SERIES FORMATION LITHOLOGY
HYDROCARBON SIGNIFICANCE UPPER SANDS
RESERVOIR No. OF DISCO- (MAJOR PRODUCERS)
NOMENCLATURE SOURCE SEAL VERIES
HOLOCENE ALLUVIUM ALLUVIUM TANGRI
NARI/GAJ UNDIFF
GAJ/NARI SAND/SHALE SOUTH MAZARI
TERTIARY
EOCENE
KIRTHAR KIRTHAR LIMESTONE DABHI
• Stratigraphic column of badin MAZARI
RANIKOT LAKI
LAKI SHALE
NORTH AKRI
PALEOCENE
GHUNGHRO
showing the khaskheli field RANIKOT
SAND
SAKHI
V V V V V V V V V V V V
JAGIR
KHADRO V V V V V V V V V V V V VOLCANIC/BASALT
V KHADRO SAND KHASKHELI
LAGHARI
UPPER GORU
TAJEDI
UPPER
UPPER KHOREWAH
CRETACEOUS
GORU
SHALE TURK
BUKHARI
MIDDLE SANDS
43 HALIPOTA
LOWER GORU
UPPER SANDS
41
UPPER SHALE ZAUR DEEP
LOWER 6
BUZDAR SOUTH DEEP
MIDDLE SANDS
5
1
S. MAZARI DEEP
LOWER SHALE
JHABERILOWER
SOUTHSHALE
BASAL SANDS 5
TANDO G. ALI
LOWER SHALE
SEMBAR
BASAL SANDS
TANDO G. ALI
SEMBAR SANDS &
SHALES TURK DEEP
UPPER
BASAL SANDS
JURASSIC
MAKHDUMPUR DEEP
TURK DEEP
MIDDLE CHILTAN CHILTAN
KHOREWAH DEEP
MAKHDUMPUR DEEP
M. ISMAIL DEEP
KHOREWAH DEEP
6
LIMESTONE SAKHI DEEP
M. ISMAIL DEEP
LOWER SHINAWARI/ FIGURE 8
DATTA LIASSIC SAND SAKHI DEEP
Petroleum system
• SOURCE
• PRIMARY SOURCE ROCKS ARE MARINE-DELTAIC LATE JURASSIC/EARLY CRETACEOUS.
[SEMBAR]
• GENERATION AND MIGRATION OF HC STARTED IN THE LATE CRETACEOUS AND IS IN PLACES
STILL CONTINUING.
• RESERVOIR
• THE PRIMARY RESERVOIRS ARE DELTAIC – SHALLOW MARINE LOWER GORU SANDS.
• TRAP
• STRUCTURAL AND TRUNCATION TRAPS ARE CURRENTLY PRODUCING HYDROCARBON
• ULTIMATE SEALING ROCK IS THE LATE CRETACEOUS SHALE [UPPER GORU]
• WITHIN THE STACKED RESERVOIRS THERE ARE OTHER SEALING SECTIONS.
• INTRA FORMATION SHALES WITHIN THE LOWER GORU RESERVOIRS ALSO SERVE AS SEAL.
Seismic dip lines
KHASKELI-1
SW LINE PK - 004 NE
TOP BASALT
Seismic dip lines showing khaskheli UPPER GORU
structure 1.0 Sec.
TOP LOWER GORU
5000’
KHASKELI – 1, drilled by UTP
reached a TD of 8,529 ft
T.D. 8529 FT
TOP
10,000’ BASAL SANDSTONE
2.0 Sec. TOP
JURASSIC LIMESTONE
TOP
JURASSIC CLAST
20,000
3.0 Sec.
Date : APRIL ‘82 Drg. NO : GE/170
Badin block exploration
Exploratory Drilling Success Ratio vs success ratio Exploratory Drilling Success Ratio
Upper Sand Middle & Basal
Sands
54% Discoveries
Discoveries
46%
46% Dry Wells
Dry Wells
54%
Exploratory Drilling Success Ratio Exploratory Drilling Success Ratio
L. Ranikot & Khadro Sembar & Chiltan
100% 100%
Discoveries Discoveries
Dry Wells Dry Wells
0% 0%
Thank you
