Transcript Template

Title Page 1
BURREN ENERGY
Nebit Dag 3D Seismic Survey
TIOGE – September 2003
TIOGE Presentation. September 2003
Slide 1
Location Map Of Nebit Dag PSA
Location Map 2
N
Change
TIOGE Presentation. September 2003
Slide 2
Regional Structure Map
Regional Structure Map 3
N
TIOGE Presentation. September 2003
Slide 3
Stratigraphic Column
Strat Column 4
•Akchagyl Muds provide the major top seal.
•Principal reservoir unit is the Middle
Pliocene Red Series. Characterised by finegrained, well cemented alluvial/coastal
plain clastics.
•Deep marine shales in the Oligo-Miocene
Maikop are thought to be the principal
source rock for this prospect.
TIOGE Presentation. September 2003
Slide 4
Nebit Dag PSA
Nebit Dag PSA Area 5
North Flank
BURUN
South Flank
MONZHUKLY
NEBIT DAG
KARA TEPE
URUNDZHUK
10 Km
KYZYL KUM
KUM DAG
Oil Field
2003 3D Seismic
Gas Field
1997 3D Seismic
Gas Condensate
Relinquished Area
1998 2D Seismic
Prospects
Nebit Dag PSA
Other 2D Seismic
TIOGE Presentation. September 2003
Slide 5
Nebit Dag PSA – Production Figures
Nebit Dag PSA Production
Figures 6
10.0
2,000
8.0
1,500
6.0
1,000
4.0
500
2.0
-
Oil Cumulative (Million m3)
Daily production of Oil, Water (m3) & Gas (Mm3)
2,500
0.0
1971
1973
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
1999
2001
2003
Calendar
TIOGE Presentation. September 2003
Slide 6
Main Activities In Nebit Dag PSA
Nebit
Dag PSA Activities Figures
7
1997 – 2002
•3D Seismic (165km2) Burun Field
•2D Seismic (500km) Exploration Area
•PHASE I: Drilling Coring and Logging 5 new wells
•Program of well workovers and perforations – 3 workover rigs
•Installation of gas lift facilities
RESULT – Increase in oil production to over 1900mt/day
Plans for 2003
•Continue well workovers and new perforations in Burun Field.
•Extend 3D Seismic over remaining exploration area.
•Commence PHASE II of drilling
TIOGE Presentation. September 2003
Slide 7
S
Why Shoot 3D? – Comparison Of 2D And 3D Lines
Comparison
of 2D and 3D Lines
8
1997 2D Line 004
2D Migration artifacts obscure
reflectors and prevent fault
delineation
TIOGE Presentation. September 2003
N
S
1998 Arbitrary 3d Line
N
Definition of both major and minor
faults is greatly improved
Slide 8
Why Shoot 3D? – 2D Seismic Interpretation
2D Horizon 9
Distances between 2D lines, combined
with poor quality data adjacent to
crestal structures, makes correlation
of faults and horizons extremely
difficult
2D Interpretation proves
to be unsatisfactory
Base Red Series. Horizon Map. 1998 2D Data
TIOGE Presentation. September 2003
Slide 9
Why Shoot 3D? – 3D Seismic Interpretation
3D Horizon 10
3D data allows more complex
structures to be precisely defined.
Interpretation resembles structural
models
Top Red Series. Horizon Map. 1998 2D Data
TIOGE Presentation. September 2003
Slide 10
Acquisition Parameters
Acquisition Parameters 11
Sample rate
Record length
Group interval
Source interval
Bin dimensions
Receivers
2 msec
7 sec
50 m
50 m
25 m x 25 m
12 geophones per station
Source pattern (expl)
3 hole pattern, 6 m depth
5 hole pattern, 3 m depth
(very soft terrain)
400-800 gm of Trotyl per hole
50,000 lb peak force - 4 in use at all
times
12 sec
8-96 Hz
4
Charge size & type
Vibrators
Sweep length
Sweep frequencies
Sweeps per VP
TIOGE Presentation. September 2003
Slide 11
Spread Geometry
Spread Geometry 12
Spread geometry - Template 1
Ch 240
Receiver line interval
500 m
Source line interval
500 m
Number of receiver lines
6
Channels per line
240, centred on source salvo
Nominal fold
36
Cross-line roll 3 receiver lines (1500 m)
In-line roll
500 m
Source configuration
10 shot salvo between 3rd and 4th line
1
Ch 240
10
Ch 1
Ch 1
Patch 1
Spread geometry - Template 2
(for core area of field)
Ch 240
Ch 240
Ch 60
Receiver line interval
Source line interval
Number of receiver lines
Channels per line
Nominal fold
Cross-line roll
In-line roll
Source configuration
500 m
500 m for primary lines 250 m between primary
lines and ‘mini’ lines
6 primary lines
3 ‘mini’ lines
240, centred on source salvo
60, centred on source salvo for ‘mini’ lines
54 over core area covered by ‘mini’ lines
3 receiver lines (1500 m)
500 m
10 shot salvo between 3rd and 4th line
1
10
Ch 1
Ch 1
Ch 1
Patch 2
TIOGE Presentation. September 2003
Slide 12
Topography
Topography 13
N
Vyshka
Monzhukly
Kara Tepe
Kum Dag
Terrain type 1: Oilfield Installations
2003 Survey Boundary
Terrain type 2: Sabkha
Terrain type 3: Lake
Terrain type 4: Gravel Plain/Sand
TIOGE Presentation. September 2003
Road
Major Pipeline
Slide 13
Terrain Type 1 – Oilfield Installation
Terrain Type 1 14
•Characterised by high density of pipelines,
wellheads and phone/electricity masts.
•Oil Spills present.
•Acquisition exclusively by Vibrators.
•PPV meter will establish safe acquisition
distances.
•Pre-planning is critical step to safe and
efficient production.
TIOGE Presentation. September 2003
Slide 14
Terrain Type 2 – Sabkha
Terrain Type 2 15
•Characterised by soft muds topped with a
brittle salt crust.
•Vehicle access is a major issue.
•Acquisition exclusively by explosives.
•Decreased drilling efficiency for 5 x3 metre
shotholes.
•Portable rigs and hand carrying of
equipment will be employed
TIOGE Presentation. September 2003
Slide 15
Terrain Type 3 – Lake
Terrain Type 3 16
•Characterised by large areas of standing
water.
•Average depth less than 1 metre.
•Acquisition exclusively by explosives.
•Saline water and oil spills will require
increased equipment maintenance.
•Portable rigs mounted upon flat-bottomed
boats shall be employed
TIOGE Presentation. September 2003
Slide 16
Terrain Type 4 – Sand Dune And Gravel Plain
Terrain Type 4 17
•Characterised by flat gravel plain or sand
dunes
•Buried pipelines exposed.
•Power cables close to surface in areas of
sand deposition
•Acquisition exclusively by vibrators.
•Minimal bulldozing to protect fragile flora.
TIOGE Presentation. September 2003
Slide 17
Satellite Map
Satellite Map 18
Buildings
Telegraph
Poles
Well Heads
Roads
Pipelines
100m
High resolution satellite map will be used to ensure that safe acquisition distances are maintained
and potential hazards are identified.
TIOGE Presentation. September 2003
Slide 18
Ray Tracing
Ray Tracing 19
Survey definition is critical
for imaging deeper horizons
Steeply dipping
horizons at base of
structure are sampled
by far offsets only
TIOGE Presentation. September 2003
Slide 19
Area Definition 20
Survey Area Definition
S
N
Increased length of 2D spread
and receiver lines provides
consistent imaging of deep
horizons.
S
TIOGE Presentation. September 2003
N
1997 3D survey edge is defined
too close to southern limb of
structure in SE corner.
Slide 20
Final Seismic Definition 21
2003 3D Seismic Area Definition
Survey boundary
extended in North
and South direction
to successfully
image steep dipping
flanks of structure.
Focus on pullapart basin for
Eastern margin
2003 Seismic Survey Area.
TIOGE Presentation. September 2003
Slide 21
Exploration Targets 22
Exploration Targets
N
S
Hydrocarbon potential
from Top Red Series to
Base Red Series.
Large channels seen
alongside flanks of
structure.
Faulting observed below Base Red
horizon.
TIOGE Presentation. September 2003
Amplitude anomalies
truncated against major
faults
Slide 22
Seismic Area Targets 23
2003 3D Seismic - Targets
Terminations against
major bounding faults.
Often expressed as
amplitude anomalies
Pull apart Basin
Major Channel
displays good
potential
Focus on pullKum Dag Fieldapart basin for
Eastern margin
2003 Seismic Survey Area.
TIOGE Presentation. September 2003
Slide 23
PSA Area II 24
PSA And 2003 3D Seismic Area
PSA Area
TIOGE Presentation. September 2003
2003 Seismic Survey Area.
Producing Fields.
Slide 24
Summary
Summary 25
•A new 3D Seismic Survey will further examine the potential of the Nebit
Dag PSA
•4 distinct terrain types will be encountered during acquisition.
•Each terrain presents a unique challenge.
•Obstacles such as pipelines, installations, sabkha etc will present a
challenge to both acquisition and maintaining high HSE standards.
•The survey area has been designed to produce optimal imaging of steeply
dipping horizons located at the base of the strike slip structure.
•A range of exploration possibilities are anticipated from the final
processed dataset.
•Total budget for the 2003 seismic survey (540km2) is $4,000,000.
TIOGE Presentation. September 2003
Slide 25