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Block 51 - Onshore Oman

SUMMARY

Block 51 is a 10,134 km2 area located in the interior of Oman. Over its history Block 51 has

had several owners and it has also experienced several significant configuration changes.

These configuration changes mean that a few of the companies only possessed a portion of

the block during their tenure. This increases the block's prospectivity.

To date gas and condensate have been discovered in the Natih Formation and gas in the

Gharif Formation. Gas shows are present in other formations. Based upon them and offset

fields/discoveries adjacent to the block the Shuaiba and Amin formations are prospective.

There are two plays within this block. The first is conventional oil and gas within Natih and

Shuaiba formations. In portions of the block both formations possess good reservoir

properties. The rocks, however, are most likely fractured.

Tight gas is the second play within Block 51. This is especially true for pre-Cretaceous

reservoirs and possibly the Natih Formation based on data from some nearby blocks. Within

the tight gas play is an unconventional sub-play for the Natih E. This unit is a source interval

and also a reservoir. Development of unconventional gas is only beginning in the Sultanate

and the Natih E has been recognized as a prime target across northern Oman.

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BLOCK OWNERSHIP HISTORY

Over its history Block 51 has had several owners and it has also experienced several significant

configuration changes. These configuration changes mean that a few of the companies only

possessed a portion of the block during their tenure. Below is the list of companies that have

owned all or part of the current block.

Petroleum Development (Oman) Ltd. (PD(O)), comprised of Shell, PARTEX and

eventually Compagnie Francaise de Petroles

Petroleum Development Oman, Ltd. (PDO) comprised of Shell, PARTEX and eventually

Total and the government of Oman

Amoco

Japex

ARCO

Nimr Petroleum

Hunt Oil

The first well was drilled in 1966 by PD(O): the Afar-2H1. The last well on the block, the Al

Naba-1H1, was drilled in 2008 by Hunt Oil.

AVAILABLE DATA

2D seismic data from 37 surveys

Block seismic base map, satellite image map and infrastructure map

Gravity data

Data for 19 wells, including raw log data and well reports

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Seismic base map

STRATIGRAPHY

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Oman chronostratigraphic chart (GTS 2012 dates incorporated)

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The figure below presents the Cretaceous section within the block. This is the autochthonous

section found below the allochthonous Hawasina section. The allochthonous section is not

found across the block but only in the northern portion. Gas shows have been noted in the

Natih and Shuaiba formations. Gas and condensate have been discovered in the Natih

Formation within the block.

Stratigraphy of the Cretaceous section within Block 51

In the Permian though Jurassic section, shown in the figure below, gas has been discovered

in the Gharif Formation. This portion of the stratigraphic section is one where nomenclature

issues exist in several of the block's wells. This issue is dealt with in Target's evaluation

package for the block.

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Stratigraphy of the Permian through Jurassic section within Block 51

The stratigraphy for the Haima Supergroup also contains nomenclature issues. For example,

these impact intervals within the Mahatta Humaid Group, where gas shows exist. The figure

below shows the stratigraphy for the Haima Supergroup. The Amin Formation is a tight gas

reservoir in an adjacent block.

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Stratigraphy of the Haima Supergroup within Block 51

OUTCROP AND ANALOGS

The following formations are present in multiple outcrops in the Hajar Mountains (Jabals

Akhdar and Shams being prime locations).

Hawasina Group: Allochthonous sediments

Natih Formation: Reservoir and source

Nahr Umr Formation: Regional seal

Shuaiba Formation: Reservoir

In the Huqf uplift outcrop area to the south of the block some of the older formations can be

observed in outcrop. These outcrops include the Mahatta Humaid group. The distance to

these outcrops, however, may diminish their use as direct analogs.

DISCOVERIES

Gas and condensate have been discovered in the Natih Formation.

Gas has been discovered in the Gharif Formation.

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SHOWS

Oil shows were observed in the following formations.

Hawasina Allochthon, Wahrah Formation

Fiqa Formation

Shuaiba Formation

Sahtan Group (undifferentiated)

Gas shows were observed in the following formations.

Hawasina Allochthon, Wahrah Formation

Fiqa Formation

Natih Formation

Shuaiba Formation

Sahtan Group (undifferentiated)

Mahil Formation

Mahatta Humaid Group (undifferentiated)

PROSPECTS

There are currently four prospects mapped within the block.

PLAY SUMMARY

There are two plays within this block. The first is conventional oil and gas within Natih and

Shuaiba formations. In portions of the block both formations possess good reservoir

properties. The rocks, however, are most likely fractured.

Tight gas is the second play within Block 51. This is especially true for pre-Cretaceous

reservoirs and possibly the Natih Formation based on data from some nearby blocks. Within

the tight gas play is an unconventional sub-play for the Natih E. This unit is a source interval

and also a reservoir. Development of unconventional gas is only beginning in the Sultanate

and the Natih E has been recognized as a prime target across northern Oman.

TRAP

Predominantly 2-way dip-closed, fault-bounded anticlines. Stratigraphic traps associated with

progradational clinoforms and carbonate platforms exist in adjacent blocks and are expected

within this block. Although not actively pursued to date imbricate thrusting and fault bend

folding within the Hawasina Group sediments would create traps.

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North-South seismic line across Block 51 showing the major reflectors.

RESERVOIR

Wasia Group

Natih Formation (gas already discovered)

Natih E is an unconventional hydrocarbon target (self-sourced)

Kahmah Group

Shuaiba Formation

Haushi Group

Gharif Formation (gas already discovered)

Mahatta Humaid Group

Amin Formation

SEAL

Aruma Group

Shales within the Fiqa Formation

Wasia Group

Natih Formation's more shale-prone members

Nahr Umr

Kahmah Group

Low permeability carbonate mudstones and shales associated with the basal portions

of its formations

Akhdar Group

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Khuff Formation

Safiq Group

Shale units within the Sahmah Formation

Mahatta Humaid Group

Miqrat Formation

SOURCE

The Fiqa Formation can serve as a source based on block well data

Natih Formation

Safiq siltstones

Huqf Supergroup as the possible deep gas source is known in area

MOVING FORWARD

Proceeding further takes you out of the public area. Doing so gives you access to the raw data

as well as the ability to order interpretation-ready and evaluation packages. There are 4 steps

for moving forward.

Step 1: MEERA Subscription for the bid round

MEERA is the software platform being used by the MOG. It allows users to view data

live and interactively from anywhere in the world. For more information on this

platform please view the LDR video.

The subscription permits general access and allows viewing of the data packages.

The system is the official point of contact with the MOG and will be used for

Interaction with the MOG, including clarification requests.

Bid submissions

Award notifications

Step 2: MOG raw data viewing and purchase

These data can be viewed live from anywhere in the world via the MEERA platform.

Acquiring the raw data is simple. These data can be downloaded directly or can be

provided on digital media for a selected destination.

There is a large amount of raw data for this block. These data include seismic lines,

well documents and gravity data. Following is a brief summary listing for seismic and

well data.

Seismic data: Results from 37 2D surveys in segy.

A00: 1 line

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A94: 3 lines

A98: 8 lines

A99: 2 lines

AC6: 15 lines

ARO3297: 26 lines

C6V: 196 lines

ENC_J: 18 lines

SURVEY_87: 41 lines

IUL: 133 lines

J: 17 lines

JP: 14 lines

NPO98: 32 lines

TBK: 33 lines

VCHC: 29 lines

NUMBERED: 5 lines

A0: 7 lines

A87: 16 lines

A91: 1 line

A94: 5 lines (separate from A94 noted above)

A95: 1 line

A98: 9 lines (separate from A98 noted above)

AC6: 81 lines (separate from AC6 noted above)

AJ: 10 lines

ANPO: 1 line

AYANG: 1 line

AYCHC: 5 lines

C6: 5 lines

HUNT_C6V: 28 lines

IUL: 42 lines (separate from IUL noted above)

JP: 11 lines (separate from JP noted above)

JP_HUNT: 5 lines

NUMBERED_2: 31 lines

NPO98: 25 lines (separate from NPO98 noted above)

OM: 1 line

TBK: 6 lines (separate from TBK noted above)

YCHC: 6 lines

Those surveys possessing a high number of lines may contain a smaller number of total

lines which have been processed in several ways.

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Well Data: Not all wells contain the same types of data. Most have log data and many

have a series of well documents. Some wells also have core data.

Abeer-1

Abeer-2

Afar-2

Al Hammah-1

Al Naba-1

Ayoun-1

Baqlah-1

Jebel Madar-1

Majan-1

Matam-1

Najah-1

S Afar-1

Shabiyah-1

Sinaw-1

Southwest Matam-1

Step 3: Target Oilfield Services’ interpretation-ready package viewing and purchase

Target Oilfield Services has prepared interpretation-ready Petrel and Techlog projects.

The Petrel project contains all seismic data and MOG raw well data. The Techlog

project contains the MOG raw log data.

Both projects will save time since the data management has already been completed.

Interpretation can proceed immediately instead of having to wait until the various

data have been loaded onto an interpretation platform.

Step 4: Target Oilfield Services’ evaluation package viewing and purchase

Target Oilfield Services has completed a comprehensive block interpretation. This

interpretation has rectified data errors and inconsistencies. It places the block within

a regional context and incorporates Target's extensive knowledge of Oman's geology

and reservoirs. Intended to aid in block analysis the evaluation package provides a

significant advantage to anyone trying to assess this block.

The interpretation package for Block 51 contains the following.

A geological evaluation report for the block.

o Reviews and updates/corrects stratigraphy across the block.

o Contains a sedimentological study for the entire Fars through Huqf

interval.

o Reviews and provides details on the geologic structures within the

block.

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o identifies existing and additional prospects within the block.

Well log data

o Edited, spliced and QC log files for wells

o Interpreted logs for wells

Fault interpretations based on the 2D seismic data

Multi-horizon TWT and depth interpretations of key horizons

Data are in digital format and can be provided as:

o Downloadable data in standard digital formats.

o A complete Petrel project containing the wells, well logs, seismic data

and interpretations.

o A complete Techlog project containing the well log data.

MINISTRY INFORMATION

When available the standard MOG data to be provided include:

All 2D and 3D seismic data within the block boundaries

Gravity data associated with the block

Well files for all wells in the block (note: these may not exist for all wells)

Cultural data: Infrastructure, etc.

Surface topography maps

Contact:

Suleiman Saif Al Ghuniami

Director of Petroleum Concessions

Ministry of Oil and Gas

Tel +968 24640526

Fax +968 24602541

E-mail: s.alghunaimi@mog.gov.om

TARGET OILFIELD SERVICES INFORMATION

Contact:

ldrsupport@targetofs.com