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Block 65

SUMMARY

Block 65 is a 1,230 km2 area located in the interior of Oman. Over its history Block 65 has had several owners and it has also experienced several configuration changes. These configuration changes mean that not all previous block holders possessed data across the entirety of the block. This increases the block's prospectivity, especially since significant oil fields exist in adjacent blocks.

Wells drilled to date have focused upon the Cretaceous age section, in particular the Natih and Shuaiba formations have been the primary target intervals. The Lekhwair Formation has also been penetrated as a secondary target. Oil has been discovered in the Natih Formation. Shows have been observed in the UER, Natih and Shuaiba formations.

There are two plays within this block. The first is conventional oil and gas within the Natih and Shuaiba formations. In portions of the block both formations possess good reservoir properties. This is an extension of the highly successful Natih and Shuaiba formations' play in adjacent blocks 9 and 27. The second play is the Natih E unconventional oil play. This unit is a source interval and also a reservoir. Development of unconventional resources is only beginning in the Sultanate and the Natih E has been recognized as a prime target across northern Oman.

BLOCK OWNERSHIP HISTORY

Over its history Block 65 has had several owners and it has also experienced several configuration changes. These configuration changes mean that not all previous block holders possessed data across the entirety of the block. 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
  • Japex
  • Occidental Oman
  • Oman Oil Company Exploration and Production (OOCEP)

The first well was drilled in 1968 by PD(O): the Maqhoul-1. The last well on the block, the Karam-1, was drilled OOCEP in 2016.

AVAILABLE DATA

  • 2D seismic data: 114 lines in segy format plus additional scanned lines
  • 3D seismic data: Two surveys that cover portions of the block
  • Block seismic base map, satellite image map and infrastructure map
  • Gravity and magnetics data
  • Data for 6 wells, including raw log data and well reports

Seismic base map

STRATIGRAPHY

Oman chronostratigraphic chart (GTS 2012 dates incorporated)


The figure below presents the Cretaceous section within the block. Wells drilled to date have focused upon this section. In particular the Natih and Shuaiba formations have been the primary target intervals. The Lekhwair Formation has also been penetrated as a secondary target.

Stratigraphy of the Cretaceous section within Block 65

OUTCROP AND ANALOGS

The following formations are present in multiple outcrops in the Hajar Mountains (Jabals Akhdar and Shams being prime locations).

  • Natih Formation: Reservoir and source
  • Nahr Umr Formation: Regional seal
  • Shuaiba Formation: Reservoirl

DISCOVERIES

The Karam-1 made a significant discovery in the Natih Formation (Natih A/B). The Al Shreega-1 encountered a thin oil column in the Natih A.

SHOWS

Oil shows were observed in the following formations.

  • UER Formation (Hadhramaut Group): 23o API oil
  • Natih A: 22.6o API oil.
  • Shuaiba Formation

PROSPECTS

There are currently several prospective structures identified within the block. These are on trend with Oxy Oman's Khamilah/Wadi Aswad trend.

PLAY SUMMARY

There are two plays within this block. The first is conventional oil and gas within the Natih and Shuaiba formations. In portions of the block both formations possess good reservoir properties. This is an extension of the highly successful Natih and Shuaiba formations' play in adjacent blocks 9 and 27.

The second play is the Natih E unconventional oil play. This unit is a source interval and also a reservoir. Development of unconventional resources 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.


Southwest (left) to northeast (right) seismic line through the B274WPST1. A horizon within the Natih Formation is shown in green. The top Shuaiba Formation is shown in violet.

RESERVOIR

Wasia Group

Natih A/B

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


Kahmah Group

Shuaiba 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



SOURCE

Natih Formation.

Safiq siltstones.

Huqf Supergroup.




Page created at 24 Aug
Last updated at 18 Sep