MAHANADI OFFSHORE BASIN

MAHANADI OFFSHORE BASIN

MAHANADI OFFSHORE BASIN 1. BASIN AREA : 260,000 Sq. Km.

1.1 BASIN LOCATION MAP : Refer Sedimentary Basin Map of India in Notice Inviting Offers (NIO)

2. EXISTING DATA BASE

2.1 SEISMIC DATA : 2D - 20723 LKM

Vintage Type Data acquired by Quantum in LKM 1978 2D ONGC (Seiscom Delta) 3,178 1988-1990 2D ONGC (Western Geophysical),

GECO 1,071

1996-1997 2D DGH (Western Atlas) 3,400 2001 2D DGH (Large) 3,112

2.2 OTHER SURVEYS : Gravity Magnetic Surveys along with seismic surveys. : Satellite Gravity Survey 2.3 Well Data :

Number of Exploratory Wells : 11

Onland : 4, Offshore : 7 Hydrocarbon : oil & gas shows in a number of

Discoveries / wells Shows

3. BLOCK ON OFFER : 1 Deep Water Block

MN-DWN-2003/1

4. BASIN TYPE : Passive Continental Margin 5. PROVEN SEDIMENTARY SECTION :

Age Range Thickness (Km) Early Cretaceous - Recent ~ 5


5.1 GENERALISED STRATIGRAPHIC SEQUENCE

5.2 GEOLOGICAL CROSS SECTION

AGETHICK.

(m.)LITHO-LOGY

PLEI

ST-

REC

ENT

PLIO

CEN

EM

IOC

ENE

E-M

EOC

.PA

LEO

.LO

WER

CR

ET.

E AR

LY

CR

E TA

CE O

US

PRE-CAMB.

200-600

200-700

600-1700

200-400

50-600

0-500

25-850

SOURCE RES. SEAL OIL & GAS

2

1.TOC >1.5%VRo 0.7 – >1.30% KEROGEN TYPE II & III

2.TOC >1.5%VRo 0.6 – >1.30% KEROGEN TYPE II & III

NOTE: SOURCE ROCK DATA FROM MODEL STUDY

1

OLIGO. 100-200


6. PETROLEUM GEOLOGY :

EXPECTED RESERVOIRS : Late Cretaceous to Pliocene sandstones & Carbonates EXPECTED SOURCE ROCKS : Paleogene Shales EXPECTED CAP ROCKS : Intraformational shales

7. PROVEN / EXPECTED PLAY TYPES :

(i) Anticlinal & Fault related structures in Cretaceous

sequence (ii) Wedgeout of Paleocene-Eocene sediments (iii) Carbonate buildup in Eocene sequence (iv) Turbidite submarine fans in Miocene

8. INTERPRETATION REPORT – CONTENTS

PART-A 1. INTRODUCTION

2. STRUCTURAL AND GEOLOGICAL OVERVIEW

2.1. Tectonic history

2.2. Stratigraphy

3. DATA AVAILABILITY AND QUALITY

3.1. Seismic data

3.2. Well data

3.3. Seismic to well tie

3.4. Survey data information

4. EVENTS PICKED

4.1. Water Bottom

4.2. Top of Miocene

4.3. Top of Oligocene


4.4. Top of Eocene

4.5. Top of Palaeocene

4.6. Top of Cretaceous

4.7. Top of Basement

5. MAP GENERATION

5.1 Time to Depth Conversion

5.2. Mapping parameters

6. INTERPRETATION RESULTS

6.1. Water Bottom

6.2. Top of Miocene

6.3. Top of Oligocene

6.4. Top of Eocene

6.5. Top of Palaeocene

6.6. Top of Cretaceous

6.7. Top of Basement

7. HYDROCARBON POTENTIAL

7.1 Source potential

7.2. Play Types

SUMMARY AND RECOMMENDATIONS

ACKNOWLEDGEMENTS

Appendix A. Reference List

Appendix B. Well Chart

Appendix C. Lithology Encounterd in Wells

Appendix D. Line Listing

LIST OF FIGURES Figure 2.1.1. Regional tectonic elements of the .East Coast of India.

Figure 2.2.1. Tectonic evolution, basin fill and petroleum systems in

Mahanadi basin.

Figure 2.2.2. Mahanadi Basin Well Correlation

Figure 3.1.1. Seismic and Well Database.

Figure 3.1.2. Example of seismic data shot by LARGE.


Figure 3.1.3. Example of seismic data shot by Western Geophysical.

Figure 3.1.4. Comparison of seismic data from different surveys.

Figure 3.1.5. Example of seismic data shot in early surveys.

Figure 3.3.1. Seismic to well tie at well NEC-4 location (line EC-95111).

Figure 3.3.2. Seismic to well tie at well NEC-1 location (line EC-95131).

Figure 3.3.3. Seismic to well tie at well MND-5 location (line EC-95161).

Figure 4.2.1. Top of Miocene. Line EC-95201.

Figure 4.2.2. Top of Miocene. Line EC-01-03.

Figure 4.3.1. Top of Oligocene. Line EC-01-04.

Figure 4.3.2. Top of Oligocene. Line EC-95201.

Figure 4.4.1. Top of Eocene. Line EC-01-08.

Figure 4.4.2. Top of Eocene. Line EC-01-12.

Figure 4.5.1. Top of Palaeocene. Line EC-01-09.




Figure 4.5.5. Top of Palaeocene. Line EC-95211.

Figure 4.6.1. Top of Cretaceous. Line EC-01-11.

Figure 4.6.2. Top of Cretaceous. Line EC-95121.

Figure 4.7.1. Top of Basement. Line EC-01-33.

Figure 4.7.2. Top of Basement. Line EC-01-12.

Figure 5.1.1. Velocity data analysis for Pliocene sequence.

Figure 5.1.2. Velocity data analysis for Palaeocene sequence.

Figure 6.1.1. Water Bottom TWT Map.

Figure 6.1.2. Water Bottom Depth Map.

Figure 6.1.3. Pliocene to Recent Isopach Map.

Figure 6.2.1. Top of Miocene TWT Map.

Figure 6.2.2. Top of Miocene Depth Map.

Figure 6.2.3. Miocene Isopach Map.

Figure 6.3.1. Top of Oligocene TWT Map.

Figure 6.3.2. Top of Oligocene Depth Map.


Figure 6.3.3. Oligocene Isopach Map.

Figure 6.4.1. Top of Eocene TWT Map.

Figure 6.4.2. Top of Eocene Depth Map.

Figure 6.4.3. Eocene Isopach Map.

Figure 6.5.1. Top of Palaeocene TWT Map.

Figure 6.5.2. Top of Palaeocene Depth Map.

Figure 6.5.3. Palaeocene Isopach Map.

Figure 6.6.1. Top of Cretaceous TWT Map.

Figure 6.6.2. Top of Cretaceous Depth Map.

Figure 6.6.3. Tertiary Isopach Map.

Figure 7.1.1. Burial, thermal and maturation history of the sedimentary

section of the Mahanadi basin near pseudo-well MOD-

D11, MOD-D12.



D13, MOD-D14.



D15, well NEC-4.

Figure 7.1.4. Map of the estimated realization of hydrocarbon

potential for probable source rocks near Top of

Cretaceous.



Palaeocene.


potential for probable source rocks near Top of Eocene.



Oligocene.


Figure 7.2.1. Play types of Cretaceous and Eocene sequence. Seismic

line EC-95140. 1 - Anticlinal and fault-related structures in

Cretaceous sequence.2 - Carbonate build-up in

Eocene sequence.

Figure 7.2.2. Play types of Cretaceous - Miocene sequences. Seismic

line EC-01-31. 1 - 85° Ridge. Erosional surface of

Cretaceous sediments. 2 - Palaeocene-Eocene

wedgeouts/ pinchouts against top Cretaceous

sequence. 3 – Sedimentary (carbonate - ?) build-up in

Oligocene sequence above crest of Ridge. 4 – Bright

spots in Eocene sequence. 5 – “Gas chimney”.

Figure 7.2.3. Play types of Cretaceous - Miocene sequences. Seismic

line EC-95211. 1 - Anticlinal and fault-related structures in

Cretaceous sequence. 2 - Palaeocene-Eocene

wedgeouts/pinchouts against 85° Ridge. 3 – Carbonate

build-up in Palaeocene sequence. 4 – “Gas chimney”.

Figure 7.2.4. Play types of Cretaceous - Palaeocene sequences.

Seismic line EC-95221. 1 – Faulted anticlinal structure in

Cretaceous sequence. 2 – Palaeocene wedgeouts /

pinchouts against 85° Ridge. 3 – Carbonate build-up in

Palaeocene sequence

(the same as on Figure 7.2.3).


Seismic line EC-01-33. 1 - 85° East Ridge. Erosional surface

of Cretaceous sediments. 2 - Palaeocene wedgeouts /

pinchouts against top Cretaceous sequence. 3 –

Amplitude anomaly in Palaeocene sequence.


Seismic line EC-01-17. 1 - 85° East Ridge. Faulted anticlinal

structure in Cretaceous sequence (85° Ridge). 2 –

Palaeocene-Eocene wedgeouts/pinchouts against


Ridge. 3 – Amplitude anomaly in Oligocene sequence

may represent carbonate reservoir. 4 – Miocene bright

spot related to Anticlinal structure formed over the ridge.

5 – “Possible Gas chemney”.

Figure 7.2.7. Seismic line EC-95140. 1 - Possible carbonate buildup in

Eocene sequence. 2 – Fault-related structural and

structural-tectonic plays in Oligocene-Pliocene

sequences.

Figure 7.2.8. Line EC 01-19. Amplitude anomaly in Top of Palaeocene

sequence related to carbonate buildups.

Figure 7.2.9. Seismic line EC-01-09. Anticlinal structure in Miocene

sequence.

Figure 7.2.10. Seismic line EC-95120. Canyons visible on the seismic

data occur in the mouth of the Ganges.

Figure 7.2.11. Seismic line EC-01-10. 1 - Canyons visible on the seismic

data occur in the mouth of the Ganges. 2 – Recent

Submarine fans rest on top of the channelised sequence.

Figure 7.2.12. Seismic line EC-01-06. Inner and mid fan lobes in

Pliocene-Recent sediments.

Figure 7.2.13. Seismic line EC-01-08. Inner and mid fan lobes in

Pliocene-Recent sediments.

Figure 7.2.14. Line EC-01-15. The turbidite fan system appear prevalent

from the start of the Miocene onwards. The older the Fan

system the more distal the resultant geometry.

Figure 7.2.15. Hydrocarbon prospects map.


PART – B

BLOCK ON OFFER LOCATION OF THE BLOCK


BLOCK : MN-DWN-2003/1

1. BLOCK AREA : 17,050 Sq. Km (approx.)

2. WATER DEPTH RANGE : 2000 m to > 2500 m

3. EXISTING DATA BASE

3.1 SEISMIC DATA : 2D - 1039 LKM

Vintage Data acquired by Quantum in LKM 2001 DGH 845 1997 DGH 194

SEISMIC COVERAGE MAP

3.2 OTHER SURVEYS : Satellite Gravity Surveys 3.3 WELL DATA Number of Exploratory Well - Nil

MN-DWN-2003/1


4. EXPECTED STRATIGRAPHIC SEQUENCE

5. DEPTH STRUCTURE MAP ON TOP OF CRETACEOUS

EC-9 5161

EC-95151

EC-01-08

EC-95160

EC-01-06

EC-01-04

EC-01-13

EC-01-02

0 10 Km

9000

8000

8500 9500

10000

1050

0

1100

0

11500

1200

0

9000

9500

1000

0

1050

0

11000

1150

09000

9500

8500

9500

10000

10500

11000 1150012000

9500

10000

11000

Scale

NORMAL FAULT

LEGEND

DEPTH CONTOUR

CONTOUR INTERVAL 500 M

13000 11500 10000 8500 7000 5000 1000 2500 100013000 11500 10000 8500 7000 5000 1000 2500 1000

DEPTH IN METERS

AGE LITHOLOGYDEPTH( M)

SOURCE RES. SEAL

1

1. TOC > 1.5%

Kerogen type – II & III

VRo - 0.7% - 1.3%

SORCE ROCK CHARACTERISTICS

R E

C E

N T

6000

4000

5000

3000

2000

1000

4200

6100

P L

I O

C E

N E

-M

I O

C E

N E

2400

8000

10000

7000

9000

6300OLIGOCENE

E

O

C

E

N

E

8800

CRET

ACEO

US

-P

ALA

EOEC

NE

LEGEND

Shale

Limestone

Fan deposits

Water

MN-DWN-2003/1


6. SOME OF THE INTERPRETED PLAY TYPES

A. Truncations and wedge-outs in Paleocene and structural highs in Eocene-Miocene sequences

B. Stacked mounds with crestal channels in Pliocene

Stacked mounds with crestal channels in Pliocene

EC-01-04TW

T IN

SEC

.

4.00

4.50

3.50

EC-01-04 EC-01-04

40002000 30002500 3500SP

WSW ENE

Glide SurfacesGlide Surfaces

Infill possibly sandyInfill possibly sandy

Paleocene truncations & wedge-outs and structural highs in Eocene-Miocene sequences

EC-01-04 EC-01-04

Truncation

SW NEEC-01-04

2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800

8.00

6.50

7.50

7.00

5.50

6.00

5.00

TWT

IN S

EC.

CRETACEOUS TOP PALAEOCENE TOP EOCENE TOP OLIGOCENE TOP

850 East Ridge

Structural High

Truncation

MN-DWN-2003/1


PART-B : BLOCK ON OFFER BLOCK : MN-DWN-2002/3 Definition of the block

Geoscientific surveys

- Geophysical Surveys

- Exploratory Drilling

Hydrocarbon prospects

Expected Play Types

Data Package

LIST OF FIGURES Fig. 1. Index Map of Block MN-DWN-2002/3

Fig. 2. Bathymetry map of Block MN-DWN-2002/3

Fig. 3. Seismic coverage map of Block MN-DWN-2002/3

Fig. 4. Seismic section along Line EC-01-04

Fig. 5. Time structure Map on Top of Oligocene

Fig. 6 Depth structure Map on Top of Oligocene

Fig. 7. Time structure Map on Top of Cretaceous

Fig. 8. Depth structure Map on Top of Cretaceous

Fig. 9 Burial, Thermal and Maturation History for Block MN-DWN-2002/3

Fig. 10 Hydrocarbon Prospects map

Fig. 11 Palaeocene wedgeouts & structural highs in Eocene-Oligocene

sequences

Fig. 12 Turbitides and submarine fans in Miocene-Pliocene sediments

Fig. 13 Miocene-Pliocene submarine fans (delta lobes) and channels

Fig. 14 Stacked Mounds with Crestal Channels in Pliocene

LIST OF TABLES Table 1. List of Seismic Lines

Table 2. Acquisition Parameters and Processing Sequence for 2D seismic

survey by DGH in 2001

Table 3 Acquisition Parameters and Processing Sequence for 2D seismic

survey by DGH in 1997

MN-DWN-2003/1


ANNEXURE

Annexure No. Description

I Contents of data package for the block MN-DWN-2003/1

MAHANADI OFFSHORE BASIN

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