the hydrocarbon potential of block ss-11, offshore bengal ... · sangu field, hatia trough, bengal...
TRANSCRIPT
All information contained in this document is strictly confidential and intended solely for the use of the individual or enti ty to whom it is addressed. This document must not be disclosed, distributed or disseminated to, or used by anyone other than the addressee. We shall not be
responsible for any liabilities incurred in reliance on the contents of this document, especially if it has been disclosed, copied, distributed or disseminated to or used by anyone without our prior notice or approval.
The Hydrocarbon Potential of Block
SS-11, Offshore Bengal Basin – An
Insight from 3D Seismic DataApril 2019
©2018 KrisEnergy Limited 2
Introduction
Block SS-11:
Bangladesh, Offshore Bengal Basin
Proven underexplored play
Early stage of exploration
50% relinquishment after the end of the Initial
Exploration Period (March 2021).
Partners:
• Ophir 45%
• KrisEnergy 45%
• BAPEX 10% carried interest
PSC signed 12 March 2014
Work Commitments:
• 1 well in shallow water (TD ≥
3300mtvdss, below mudline)
• 300km2 3D survey (completed 2018)
©2018 KrisEnergy Limited
Area Location Map
www.krisenergy.com 3
!(
!(!(
!(
!(!(
!(!(
!(
!(
!(!(!(
!(
!(
!(
!(
!(
!(
!(
!(
!(!(
!(
!(
!(
!(
AD-4
AD-3
AD-13
AD-2AD-9
A-3
AD-10
AD-11
AD-12
A-4
AD-8
A-2A-1
AD-1
AD-7
A-5
AD-6
A-6
AD-5AD-14 A-7
7
9
8
23
1
5
12
10
11
15
2B
3A
4A
6B6A
22B
22A
2A
4B
14
3B
SS-04
SS-09SS-01
SS-03
SS-06SS-05
SS-07SS-08
13
SS-10
SS-11
SS-02
DS-08
DS-20
DS-11DS-09 DS-12
DS-19
DS-13
DS-18
DS-17
DS-10
DS-14
DS-16
DS-22
DS-15
DS-21
Myanmar
Nepal
India
¹
0 100 20050 Km
1 cm = 43 Km
Legend
!( Gas Fields
Existing Gas Pipeline
Block SS-11
• Offshore Bengal Basin
• Bengal Shelf
• Water depths: 10 – 700m, with the majority of the
block lying in water depths less than 200m
• Area: 4,475km2
©2018 KrisEnergy Limited 4
Tectonics – Dominated by India-Asia Collision and Subduction
Key Tectonic Events:
Late Jurassic–Early Cretaceous magmatic
arc and metamorphism associated with
India-Asia collision and eastwards
subduction.
Mid-Eocene–Oligocene post collision
crustal thickening, metamorphism and S-
type leucogranite magmatism along the
Burma Mogok metamorphic belt.
©2018 KrisEnergy Limited 5
Tectonics – Resultant Domains
©2018 KrisEnergy Limited 6
“Tight
Folds”
“Gentle
Folds”"Passive Margin" vs. "Intraplate Deformation"
"Gentle Folds" vs. "Tight Folds":
This deformation is most intense in the east,
resulting in tight faulted and very elongated
anticlines exposed in the onshore Chittagong
Fold Belt.
Towards the west, deformation is progressively
younger, and characterized by gentler less
elongated anticlinal structures that are less
affected by faulting, as seen in the SS-11 and
Shwe areas.
Structure – Dominated by NNW-SSE Folds
©2018 KrisEnergy Limitedwww.krisenergy.com 7
Megasequence 1(MS1)
• Laterally continuous events, high amplitude reflectors and minor channel incision
• The southernmost extent is marked by the shelf-edge and well-developed clino-
forms
Megasequence 2(MS2)
• Abundant large-scale erosive canyons, resulting limited lateral continuity.
• The canyons are filled with seismically different reflectors
Megasequence 3(MS3)
• Laterally continuous seismic reflectors with many small-scale, estuarine erosive
events
Recent
Holocene 0.01
MaMega
Sequence-3
Pleistocene
(2.6 Ma)
Pliocene
(5.3 Ma)
Epoch/Age Sequences
(Cairn Energy)Lithostratigraphy
Mega
Sequence-2
Upper
Miocene
(7.2 Ma)
Mega
Sequence-1
Top MS 2
Top MS 1
Tipam
Gro
up
RecentAlluvium
Bo
kabil
Pliocene Shelf Break
Present Day
Shelf Break
Miocene Shelf Break
Megasequence-2
Regional Stratigraphy
©2018 KrisEnergy Limitedwww.krisenergy.com8
MTD: Mass Transport
Deposits
E1: Eastern Turbidite
Channels
W1: Western TurbidIte
Channels
E1
Present day Submarine Canyon
Present Day Active Fan Sedimentation
Channel ShiftingRecent day active Channels
Pliocene Submarine
Canyon
Upper Miocene Submarine Canyon
M Miocene Submarine Canyon
E7
Pliocene Shelf-Slope Break
Upper Miocene Shelf- Break
M Miocene Shelf-Break
E2 E3 E4 E5 Upper MiocenePliocene
250 km
Early to Middle Miocene
Bengal Fan Depositional Model
©2018 KrisEnergy Limited 9
Block SS-11 – Petroleum Systems Summary
Source rocks and Charge
• Mio-Pliocene gas prone shales providing both biogenic and
thermogenic gas charge
Reservoirs
• Mio-Pleistocene sands of the Bengal Fan
• Southerly prograding and aggrading delta system sourced from the
Ganges‐Brahmaputra drainage system.
• Various depositional environments identified, ranging from deepwater
basin floor fans and slope fans to shallow marine delta tops and
channel sands
Traps
• Anticlines forming part of the Magnama-Shwe anticlinal trend have
been recognised and mapped in the eastern part of Block SS-11.
• Stratigraphic traps, largely associated with shale-filled channel or
canyons which cut into stacked, reservoir quality sands and interbedded
shales.
• SS-11 is characterised by various play types from broad and tight
anticlines, through to stratigraphic/structural and fault dependent
closures.
Seals
• Top seals are largely Plio-Pleistocene regional shales, with
intraformational and shale filled channel cuts forming additional lateral
and/or additional top-seals.
©2018 KrisEnergy Limitedwww.krisenergy.com 10
Gas
Ch
imn
ey
BFF CFS
LeveeMegasequence-3
Megasequence-2
Megasequence-1
Gas Migration through
Faults
Bay of Bengal Submarine Canyon
Mud-fill incised canyon
MTD
CHF
Ga
s C
him
ne
y
Fault Migration
Block SS-11 – Source and Charge / Migration
• Miocene and Pliocene gas prone shales
provide both biogenic and thermogenic gas
charge
• The average TOC content of Mio-Pliocene
Surma Group is 0.2 - 0.78%
• Late Miocene/Early-Late Pliocene biogenic
origin confirmed for the adjacent Thalin and
Shwe gas Field
• Organic rich Oligocene-aged shales another
potential source
©2018 KrisEnergy Limitedwww.krisenergy.com 11
Mass Transport Deposit
R
R
Basin Floor Fan
Channel Fill Sand
Complex Channel Fill
Leveed Channel/Shelfal
Sand
Prograding
Wedge/Slope fans
Proven Reservoir
Unproven Reservoir
Legend
Me
ga
Se
qu
en
ce
-3M
ega
Se
qu
en
ce
-2M
ega
Se
qu
en
ce
-1
Reservoirs
Tipam G
roup
Upper
R R
RR
RR
Block SS-11 – Reservoirs
©2018 KrisEnergy Limitedwww.krisenergy.com 12
Block SS-11 – Traps and Seals
• 1 Anticlines forming part of the Magnama-Shwe anticlinal
trend have been recognised and mapped in the eastern
part of Block SS-11.
• 2 Stratigraphic traps, associated with mud-filled channel or
canyons that cut into stacked, reservoir quality sands.
• 3 Mio-Pliocene basin floor fans.
• Top seals are largely Plio-Pleistocene regional shales.
• Lateral sealing provided by mud filled channels.
Teknaf
Sangu
Coral Dip
Magnama
Blcock SS-11
6Km
60
0m
1.
32
11
2
3
©2018 KrisEnergy Limited 13
Exploration Targets – “Tight Fold” Examples
Kailashtilla Field
Bibiyana Field
Rashidpur Field
©2018 KrisEnergy Limited 14
Regional Example – Offshore Hatia Trough
Sangu Field, Hatia Trough, Bengal Basin, offshore Bangladesh
Seismic section from the Sangu to Jaldi structures - Jaldi lies within the coastal Chittagong Foldbelt
whereas Sangu is located within the Hatia Trough - both structures though are a result of late stage,
westward fold and fault propagation. (modified from Najman et al., 2011).
Pliocene
canyons
Pliocene
canyons
Megasequence 3
Megasequence 1
Megasequence 2
A A’
A A’
“Tight
Fold”
“Gentle
Fold”
©2018 KrisEnergy Limited 15
“Tight
Folds”
“Gentle
Folds”
A
A’
(modified from McKenna, 2006)
A A’
Channelling
Low Amplitude
“Gentle Folds”
Fault Bounded
“Tight Folds”
Exploration Targets – “Gentle Fold” Examples (SS-11)
©2018 KrisEnergy Limited
SS-11 – Multiple Play Types
Shelfal and
channel
levee sands
1
Sand- and shale-filled canyons and channels
2
Slope fans and channels3
Basin floor fans4
Proven: Stratigraphic
Proven: Stratigraphic
Proven: Stratigraphic
Proven: Stratigraphic
Low Relief Anticline
Proven: Combined Anticlinal
5
6 Mass Transport Deposits
Proven: Stratigraphic
1
2 3
4
4
4
4
3
3
3
2
21
Megasequence 3
Megasequence 1
Megasequence 2
Incised Canyon Fills
Slope to Basin Floor Facies
3
Shelf Breaks
Shelf Breaks
Low relief anticline
5
6
6
5
©2018 KrisEnergy Limitedwww.krisenergy.com 17
Basin Floor Fan, SS-11
Channel Fill Sand
SS-11
Submarine Canyon
Slide and Slump
Scour
Basin Floor Fan
Channel Fill Sand
Complex
Channel Fill
Shelfal/Channel
Levee Sand
Mass Transport
Deposits
Slope
Fans/Prograding
Wedge
Low Relief AnticlineContinental Shelf
SS-11 – Play Model
Channel
Bounded Sand
SS-11
©2018 KrisEnergy Limited 18
Shwe Discovery – Original Target - Shwe Anticline
Shwe
anticline
trend
Main
reservoir
Anticline at
surface
Outboard
anticline trend
(from Santos, 2013)
A
A’
A A’
©2018 KrisEnergy Limited 19
Shwe Discovery – More “Complex” than that
Feeder
Channel
Proximal
Fan
Distal
fan
Shwe Phyu
Field
Shwe
Field
Mya
Field
Proximal
Fan
0 5 10km Shwe-1A
Comprises of three (3) back-stepping
distributary channel/fan complexes (Shwe,
Shwe Phyu and Mya), aligned from N-S along
west flank of the Shwe Anticline
1
2
3
Fan amplitude (G5.2
sands) over anticline
structure
Amplitude extraction
G5.2 reservoir
©2018 KrisEnergy Limited 20
Block SS-11 – 2018 3D Seismic Data
2D LINES and 3D DATASETS
BODC 2
BODC 3
SS-11 block
boundary
JADE-01
2D lines
2018 3D
outline
©2018 KrisEnergy Limited
Block SS-11 – Prospects and Leads Summary
• Prospective areas have been mapped with more than 7 tcfg of associated recoverable reserves • Multiple play types identified on the Block• Potential to test multiple targets from a single drill location. • Multiple gas chimneys throughout the Block indicate an active petroleum system• The majority of the identified prospects are in shallow water (less than 100m) with reservoir
intervals depths of 2,600 – 3,200m
2018 3D seismic outline
©2018 KrisEnergy Limited 22
Block SS-11 – 3D Paleoscan Image (Colour Blended)
5Km
Incised Canyon
Fills (sand)
Megasequence 2
Megasequence 3
Basin Floor Fans
Shelfal Sands
(laterally sealed)
©2018 KrisEnergy Limited 23
Block SS-11 – RMS Amplitude Map - Major Canyon-fill
5Km 5Km
2018 3D
seismic
Major
Canyon
Major
Canyon
Major
Canyon
©2018 KrisEnergy Limited 24
Block SS-11 – RMS Amplitude Map - Basin Floor Fans
3
4
2
1
5
6
7
3
4
2
1
5
6
7
5Km
Feeder channel
©2018 KrisEnergy Limited 25
Genetic-link – Block SS-11 and the Multi-TCF Shwe Discovery
3
4
2
1
5
6
7
5Km
Feeder channel
2018 3D seismicSS-11
Shwe Phyu
Shwe
Mya
Major
sediment supply
from NW
(G-B sediment
Input system)
Overbank
Feeder
channel
Fan
Lobe
Minor local
Sediment
supply from NE
Shwe
Discovery
1
2
3
Major
sediment supply
from NW
(G-B sediment
Input system)
Major
sediment supply
into Shwe area
RMS Amplitude map at various t=2.6s – Basin floor fans
©2018 KrisEnergy Limited
Block SS-11 – Sheemanto Prospect
• High potential, untested in Bangladesh but similar to successful Myanmar plays
• Multiple plays tested from one surface location• Shelfal facies sealed by shale filled channels (2,500m)• Sand filled channel (3,300m)• Basin floor fans (4,100m)
• Sheemanto focus of 3D seismic acquisition. 308km2 acquisition completed May 2018
• Drilling 2021/2022• Water depth circa 90m)
A
Arbitrary NS 3D seismic dip line showing the multiple targets of Sheemanto
Sheemanto shelfal sands cut by shale filled channels
Sheemanto channel lead
Shale filled channel
BN A
VRMS Map of 430Basin Floor Fan 1
Sheemanto basin floor fan ( ~37 km north of the Thalin gas field)
BS