the hydrocarbon potential of block ss-11, offshore bengal ... · sangu field, hatia trough, bengal...

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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

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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


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.


Tectonics – Resultant Domains


“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


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.


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


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


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


Exploration Targets – “Tight Fold” Examples

Kailashtilla Field

Bibiyana Field

Rashidpur Field


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”


“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)


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




Low Relief Anticline

Proven: Combined Anticlinal

5

6 Mass Transport Deposits


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


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


Shwe Discovery – Original Target - Shwe Anticline

Shwe

anticline

trend

Main

reservoir

Anticline at

surface

Outboard

anticline trend

(from Santos, 2013)

A

A’

A A’


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


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


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


Block SS-11 – 3D Paleoscan Image (Colour Blended)

5Km

Incised Canyon

Fills (sand)

Megasequence 2

Megasequence 3

Basin Floor Fans

Shelfal Sands

(laterally sealed)


Block SS-11 – RMS Amplitude Map - Major Canyon-fill

5Km 5Km

2018 3D

seismic

Major

Canyon

Major

Canyon

Major

Canyon


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


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


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

the hydrocarbon potential of block ss-11, offshore bengal ... · sangu field, hatia trough, bengal...

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