this is presentation of Bombay high oil field

1. BOMBAY HIGH
- Omkar Waghumbare
1
@omiii_o8

2. INTRODUCTION
•Bombay High is an
offshore oilfield 160
kilometers (99 miles) off
the coast of Mumbai,
India.
•The oil operations are run
by Oil and Natural Gas
Corporation (ONGC).
2

3. DISCOVERY
• In early 1960’s, a Russian seismic ship started
exploration in the Mumbai offshore basin.
• Regional geophysical surveys were conducted by this
seismic vessel in the area.
• The oil field of Bombay High was thus discovered
during the mapping of Gulf of Khambat in 1964-67.
3

4. • After Discovery Regional geophysical surveys were
conducted by seismic vessel in the confirmed
reservoir area
• ONGC first started drilling in Bombay High with the
drillship Sagar Samrat in 1973.
• The field was put on production in May 1976.
4

5. EXPLORATION
• Seismic exploration vessel
discovered the Bombay High
oilfield.
• ONGC geophysicist M
Krishnamurthy headed the
Indian team which was
attached with the Russian
Offshore seismic expedition.
5

6. • Mumbai North
• Mumbai South
• Mukta
• Panna
• Bassein
• Neelam
• Heera
• Intense exploration and development activities in the
basin have resulted in significant discoveries of
several oil and gas fields
6

7. • Mumbai High North (MHN), an Indian Offshore oil
field is a multilayered carbonate reservoir. This field
has been producing for the last 35 years.
• The Panna-Mukta oilfield consists of two contiguous
offshore oil fields to the northwest of Mumbai, India.
• Bassein is a major gas field in the western offshore
basin of India and is producing gas since 1988.
7

8. • Heera oil Field Located at 70km South west of
Mumbai
• Heera oil field started production in 1984
8

9. DATA PROCESSING & INTERPRETATION
•The first ever momentous application of velocity
analysis was on Bombay high in 1971-72, interval
velocity studies indicated presence of limestone
reservoir in the structure.
•In 1982, a small group of geophysicists was asked
to solve the geologic problems associated with field
development and production.
9

10. •A few wells drilled later on confirmed the seismic
predictions of the synergist group and this resulted
in significant upward estimate of in-place reserves
and in suitable modification of the injection wells
locations.
•In 1997, acquisition of seismic data in Bombay High
offshore through Ocean Bottom Cable (OBC) with
dual sensors was the watershed in the use of latest
tools in ONGC.
10

11. PRODUCTION
•Mumbai High Field
reached its peak
production level in 1998
with 20MMT a year.
Along with its adjoining
fields, it produced at a
rate of 12.8MMSCMD of
gas prior to the recent
redevelopment projects.
11

12. • The production was approximately 265,000bopd with
an average of 63% of water cut and an average
production of 1,200 barrel of liquid a well during
2007.
• Up till 2004, Oil field of Bombay High accounted for
about 38% of the entire domestic production and
supplied 14% of the oil requirement.
• The north platform used to produce 110,000 barrels
of oil every day
12

13. • The field is operated using the gas lifts method, which
is a major artificial lift method used for oil production.
Several gas compressors spread over a number of
process complexes in the field to support the broad
gas lift network.
• As of 2018, the average daily crude oil production at
Mumbai High field was 16.9MMT and gas production
was approximately 52.32MMSCMD.
13

14. STRATIGRAPHY
• Mumbai high is divided into two blocks.
1.Mumbai High North (MHN)
2.Mumbai High South (MHS)
• The low permeability zone divides the Mumbai high north
and south.
• There is a 15 meters wide fault between north and south.
• The estimated initial oil-in-place (OIIP) in Mumbai high north
and south is 1659 Million metric tone (MMT)
14

15. PETROLEUM SYSTEM
• Bombay offshore basin
accounts for nearly two
thirds of the annual
petroleum production
of India.
15

16. TOTAL COMPOSITE PETROLEUM SYSTEM
Source Rock
• Panna formation of Palaeocene-Early Eocene is main source rock of
crude oil formation. Panna formation spread over the entire Mumbai
offshore basin.
• Besides Panna formation, coral reefs are the source rocks as well as
reservoirs.
• Panna formation Total Organic Carbons (TOC): 0.5-20.4 % Thermal
gradient is 3 degree per 100 feet.
• The source rocks contain mixed type-II and type-III kerogens.
16

17. Reservoir rock
• Limestone is the main reservoir. Limestone is basically
Micrite, Biomicrite and chalky type. They posses mainly
primary and secondary porosity.
• Average Porosity range: 15- 35%
• Average Permeability: 10 MD to 1 Darcy
• Other rocks are of Mukta, Bassein, Daman, Panna formation
in Tapti Daman block.
17

18. Cap rock
• Shale is mainly cap rock in Mumbai high. But somewhere carbonates
are also present as cap rocks wherever tight limestone is formed.
• E.g.: Bassein Reservoir.
Seal
• In the Bombay offshore and Kutch areas, the most likely seals are an
extensive series of thick middle to upper Miocene shales. In the
Cambay Graben, interbedded Paleocene through middle Miocene
shales provides seals for the various reservoirs.
18

19. ACCIDENT
• On July 27,2005, 160km West of Mumbai Cost (India),
11 people were killed & 11 missing.
• 362 people were rescued by Offshore Vessel,
Helicopters, Indian Navy and Coast Guards.
• The raging fire that gutted an ONGC oil-drilling platform
in The Bombay High oil field area was caused when an
ONGC vessel "MSV Samudra Suraksha" sent to pick up
a sick worker at the giant platform.
• The platform was destroyed within 2 hours of fire. The
property loss faced by ONGC is 300Million USD.
19

20. 20

21. FUTURE PROSPECTS
• ONGC has floated a tender
for the acquisition,
processing and
interpretation of 1975 sq km
or 4C-3D seismic data in the
Mumbai High area.
• 1600 sq km in Mumbai High
field
• 75 sq km in Heera field.
21

22. THANK YOU
22