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'THE GEOLOGY AND MINERAL RESOURCES OF DHUFAR PROVINCE, MUSCAT AND OMAN' [‎45v] (80/96)

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The record is made up of 1 item (47 folios). It was created in 1947. It was written in English. The original is part of the British Library: India Office The department of the British Government to which the Government of India reported between 1858 and 1947. The successor to the Court of Directors. Records and Private Papers Documents collected in a private capacity. .

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64
%
f
of Petroleum Geologists, Vol. 17, No. 3, March 1933, pages 299 to 340),
and the other ‘The Geology of the Oil-field Belt of S.-W. Iran and
Iraq’ (see Geological Magazine, Vol. hXXVII, No. 3, June 1940,
pages 227 to 252), the general principles are clearly explained. In the
former paper the reservoir rocks (i.e. those from which the oil is
yielded up to wells) of three oil-fields are discussed. These are
Masjid-i-Sulaiman, Haft Kel and Naft Khaneh. In these cases the
‘ reservoir rock ’ is a Limestone of lower Miocene age, called the
Asmara Limestone. It is a fine-grained foraminiferal Limestone,
mostly of low porosity, and the porosity of the rock is independent
of the degree of dolomitization. It is in the fractures, joints and
cracks that the oil is held and these are essential factors in the
oil-yielding capacity of the rock. In the latter paper Dr. Lees has
reviewed the primary conditions for oil-fields. These are:
(i) The occurrence of source rocks within which oil can be
formed from material constituting the rock;
(ii) The presence of reservoir rocks which are able to store
the oil and also deliver it up to wells;
(iii) Impervious strata or cover rocks which prevent the escape
of the oil upwards to the surface; and
(iv) Proper structural features, arches and domes, in the
strata of (ii) to allow oil to accumulate locally.
99. In Iran and Iraq the ‘source rocks’ are believed to be
certain chocolate to brown-coloured strata with 15% of hydro
carbon matter adsorbed in them, and which are thought to range in
age from Trias or Jurassic to Eocene. In Dhufar they could well
be represented by the Samhan series discussed in paragraphs 72
and 73, and which include just those strata in which the bituminous
matter, etc., as well as the ‘oil show’ of Murbat bay, occurs. These
strata have not been searched or studied to establish whether they
carry appreciable percentages of hydrocarbon, and this evidence
will be difficult to secure from such outcrops as are seen. They
carry uncertain evidence of petroleum residues, which, if true,
might have come during the upward escape of oil from lower strata
not exposed in Dhufar. In Iran and Iraq the ‘reservoir rocks’ as
stated are the Asmara Limestones of Miocene age, but it is also known
that certain Eocene Limestones are ‘ reservoir rocks ’ in the Kirkuk
° ~ Them are no Oligocene and younger (Miocene) rocks in
u ar, and the Limestones of the Qara mountains appear to be
largely upper to middle Eocene, but I doubt whether they are
functioning as reservoir rocks’. This applies also to the.basal
Limestones of the Jabal Samhan which may be lower Eocene and
possi y upper Cretaceous in age. The total thickness of the
Limestone series of Jabal Qara and Jabal Samhan is probably not
more than 3,000 feet. The next series below, the argillaceous and

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This booklet contains a comprehensive geological report compiled by Sir Cyril Sankey Fox for the Omani Government in 1947. The booklet is the first general mineral audit of the southern reaches of Oman, near its border with Yemen, along with a detailed description of the geography. The mineral audit includes descriptions of potential oil deposits. The booklet also contains a map of the Dhufar coast.

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1 item (47 folios)
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'THE GEOLOGY AND MINERAL RESOURCES OF DHUFAR PROVINCE, MUSCAT AND OMAN' [‎45v] (80/96), British Library: India Office Records and Private Papers, IOR/L/PS/12/1422, ff 6-53, in Qatar Digital Library <https://www.qdl.qa/archive/81055/vdc_100058140641.0x00005c> [accessed 4 March 2024]

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