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Block 47 - Onshore Oman
SUMMARY
Block 47 is located in the interior of Oman and covers 8,524 km2. Unlike most blocks this one contains
substantial outcrop belts of the major reservoirs, seals and source intervals expected within it.
Likewise, some of the structural and stratigraphic trapping possibilities are present in laterally
extensive outcrop belts.
The northern portion of the block contains Jabal Akhdar and Jabal Shams. Extensive erosion of these
mountains has resulted in a breach of the Jabal Akhdar anticline and the creation of a series of
extremely deep wadis cutting through the stratigraphic section. Because of this it is possible to view
in detail the three dimensional aspects of what are the subsurface reservoirs in the portions of the
block were gas and gas/condensate have been discovered.
Tight gas is the predominant play within Block 47. To date gas has been discovered in the Natih and
Shuaiba formations while gas/condensate has been discovered in the Amin Formation. These
discoveries have not been fully appraised. There are currently four gas and gas/condensate prospects
mapped across the block.
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.
Infrastructure within this block is exceptional. The towns of Nizwa, Bahla and Al Hamra are within the
block. These are major towns within the interior so modern roads occur throughout the non-
mountainous areas. Within the mountainous regions roads exist that connect the villages to the
modern road infrastructure. Other infrastructure elements such as power and water exist across the
block.
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BLOCK OWNERSHIP HISTORY
The current configuration of Block 47 has evolved since the area was first designated for offering to
outside companies. The original area was once part of Petroleum Development Oman's (PDO) nation-
wide concession. A significant portion of that concession area was relinquished, as specified in the
original agreement, during the 1970s.
As of today the owners of the block in its current configuration have been the following companies.
PDO
Amoco
Indago Oman
Novus Oman
RAK Petroleum
DNO
AVAILABLE DATA
Block seismic base map, satellite image map and infrastructure map
4,175 km 2D seismic data
Gravity data
6 Wells
Seismic and well location base map
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STRATIGRAPHY
Oman chronostratigraphic chart (GTS 2012 dates incorporated)
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The stratigraphic section occurring in this block can be placed into three groups. The oldest of these
ranges from Precambrian to Early Silurian in age and contains the Haima and Huqf Supergroups. The
Amin Formation is part of the Haima Supergroup and so far is the deepest formation penetrated within
the block.
Separated by a regional unconformity that removed well over 100 million years of geologic time is the
predominant pay section. This begins with the Permian age Haushi Group and generally ends with the
Fiqa Formation of the late Cretaceous age Aruma Group. Within this portion of the stratigraphic
section can be found the Natih, Shuaiba and Lekhwair formations, all of which are regionally significant
reservoirs.
Stratigraphy of the Khamah and Wasia Groups in Oman
Finally, overlying the previous portion of the geologic section is the Triassic through Tertiary age
allochthonous section associated with the Hawasina Thrust Complex. This interval is composed of
time-equivalent rocks from over 200 kilometers away. These were thrust over the block as a result of
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Tertiary obduction. This portion of the section covers the block but is thinner in the southern-most
area.
OUTCROP AND ANALOGS
The non-Amin prospective and source intervals as well as some regional seals are found in outcrop
across the northern portion of the block. These are exceptional outcrops and several of the formations
found in the subsurface were first described at these outcrops. This outcrop locations include Jabal
Akhdar and Jabal Shams. The wadis within the block have eroded deeply, exposing the formations in
multiple, predominantly dip-oriented transects. The following formations are present in multiple
outcrops and can also be viewed regionally along the modern road to Jabal Akhdar.
Hamrat Duru Group: Allochthonous sediments of the Hawasina Basin
Natih Formation: Reservoir and source
Nahr Umr Formation: Regional seal
Shuaiba Formation: Reservoir
Kharaib Formation: Potential reservoir
Lekhwair Formation: Potential reservoir
The Amin Formation is not found in outcrop within the block. The nearest outcrops are rather far away
to the southeast, in the Huqf High. There are some professional papers that have been published. The
Target interpretation package also contains material on this formation.
DISCOVERIES
Gas: Natih and Shuaiba formations
Gas/Condensate: Amin Formation
PROSPECTS
Ten mapped prospects that target the Natih, Lekhwair or Amin formations. These are gas and
gas/condensate prospects. They are distributed across the block.
PLAY SUMMARY
The play for this block is Tight Gas. An active hydrocarbon system has been established for this and
adjacent blocks. There are two hydrocarbon sources to which most of the stratigraphic succession
found within the block have been exposed.
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
Hamrat Duru Group sediments would create traps.
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SW to NE seismic line across an anticline. This structure was tested by the Hawamel-1. Pressure
data indicate gas across several zones.
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Top Natih Formation TWT interpretation
RESERVOIR
All potential reservoirs that have been encountered in the block are tight. The carbonate reservoirs
are fractured, which is common in the blocks adjacent to this block. These can be considered
unconventional reservoirs. These are listed below by Group.
Wasia Group
Natih Formation (gas already discovered)
Natih E is an unconventional hydrocarbon target (self-sourced)
Kahmah Group
Shuaiba Formation (gas already discovered)
Kharaib Formation
Lekhwair Formation (strong gas shows)
Mahatta Humaid Group
Amin Formation (gas/condensate already discovered)
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SEAL
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
Khuff Formation
Mahatta Humaid Group
Miqrat Formation
SOURCE
Cambrian sourced from Huqf Supergroup
Natih E
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.
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Seismic data: Results from 14 2D surveys in segy format and 46 2D post-stack scanned sections
in pdf format.
BP_85JAW1: 9 lines in segy format
CEL93REG1: 1 line in segy format
IND07BHL1: 6 lines in segy format
IND07IBI1: 13 lines in segy format
IND07IBI2: 70 lines in segy format
IND07JAW1: 43 lines in segy format
JPX82REG1: 3 lines in segy format
MOL08REG1: 20 lines in segy format
NOL03BHL1: 45 lines in segy format
NOL04BHL1: 24 lines in segy format
PDO82REG1: 2 lines in segy format
PDO84REG3: 11 lines in segy format
PDO98JSK1: 4 lines in segy format
RAK11BHL1: 16 lines in segy format
Those surveys possessing a high number of lines may contain a smaller number of total lines
which have been processed in several ways.
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.
CH-2 (West Miadin)
CH-12 (Al Aridh)
Hawamel-1
Mamurah-1
Zad-1
Zad-2
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
In order to aid in block evaluation Target Oilfield Services has created an interpretation
package. The information it contains is based both upon the MOG's raw data for the block as
well as Target's extensive knowledge of Oman and the region. This provides a significant
advantage to anyone trying to assess this block.
The interpretation package for Block 47 contains the following.
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A geological analysis report for the block. This report goes into greater detail regarding
plays across the block and the block's petroleum system. It also provides a
sedimentologic study.
Well log data
o Edited, spliced and QC log files for wells
o Interpreted logs for wells
Fault interpretations of the 2D seismic data for the following horizons.
o Natih Formation
o Habshan Formation
o Dhruma Formation
o Amin Formation
Multi-horizon TWT and depth interpretations of the 2D seismic data.
o Natih
o Habshan
o Dhruma
o Amin
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 Kingdom 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: [email protected]
TARGET OILFIELD SERVICES INFORMATION
Contact: