PETROLEUM-BEARING PROSPECTS OF THE FERGANA VALLEY IN THE LIGHT OF THE RESULTS OF EXPLORATORY WORK IN 1940-1946
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Document Creation Date:
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Publication Date:
May 14, 1953
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REPORT
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VROLASSIPIED m For Otrioia1 Use 0440
PlinOLOMmti4ARINQ PAOWICTb LF TRU FEHUANA VALLEY IN
TiE LIGHT OF TfiL WuLTS OF EXPLOhATORY WORK DONE IN
1940-1946
S. I, Win and A. M. Oebrillyan
Froms Neftyanoye khozysystvo [Petroleum Sconomy), No 4,
April 1946, Moscow, Pages 35-14
Over the years of the Great National War, much work was
accomplished in the field of examining both the geological structure
and the petroleum-bearing prospects of the Fergana valley) it was
accomplished by the VNGRI expedition in cooperation with a group of
geologists of Kalininnefti trust and the Uzbek Academy of Sciences.
Its basic conclusion consisted of the discovery of excellent
prospects in the Fergana valley in connection with the development
of numberous clost4 conglomerate structures which appear on the sur-
face as adyrs [adyr: a group of peculiar law hills in Turkmenistan)
in the morphological sense.
As a result of exploratory drilling in the closed structures
of the adyr zone, a huge amount of interesting material on their
geological structure has been accumulated.
The geological construction of conglomerate anticlinal folds
appears to be much more complicated than was formerly presumed by
the majority of geologists.
Let us examine the general process characteristics of the
alpine tectogenesis in the Fergana valley.
The formation of folds in the Mesozoic-Cenozoic deposits,
STAT
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4
According to the opinion of 8. I. Win and V. lidopova, El, 33,
was caused by a grovimetric factor, the origination of which was
duo to dislocations in the Paleozoic substrate, considerably up-
lifted in the adjacent mountain structures if one comparee tte bed
in the depression itself. Under these conditions, a strong tendency
was evidenced, of course, at the periphery of the depression to
subside gradually toward its central part.
For this reason, a more pronounced folding in the Mesozoic-
Cenozoic deposits appeared both at the southern and the northern
boundaries of the Fergana valley. Its folds must feature softer,
forms toward the center; however, their presence under the cover
of contemporary formations is, in the authors opinion, absolutely
necessary. Granted sufficient tension in the formation of folds,
structures must arrange themselves into the linearly elongated zones;
this has been actually observed on the arrangement example of con-
glomerate folds in southeastern Fergana.
As the tectonic movements originated, the formation of folds
took place more or less simultaneously. The folds that were formed
on the sides of large anticlines or on Monoclines in the foothills
will constitute an exception. The Neftedbad and Ayritan structures
on the northern side of the large isfarin anticline as well as May-
lisuy and isbaskent structures on the monocline in northeastern
Fergana are examples of such folds. These folds also differ in
their shape. In cross-section., they become similar to a flexure
with one long, sloping side and one short, steeper side.
In the case of progressive character of folding, the appearance
of structures in the shape of very gentle upheavals occurred as early
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as in the Paleocene period, The data of 8. 8. 8hu1t and 8. 1.
]lin confirm this claim. However) the latter refers to the strum,
tune of an equal foundation, so to speak, and does not belong to
the eookagiory flexao?chapod folds, the formation of which had al-
ready taken place on the sides of large towering anticlinal atruom
tures.
If folds arise simultaneously and are found in the same tec-
tonic zone, they will exhibit more or leas uniform dimensions, with
the exception of those instances when the influence of Paleozoic
substrata ledges becomes an important factor in their formation.
The folds must also feature a lesser elongation and softer configura-
tion as they approach the center of the depression. For this reason,
the length of Paleocene folds in the adyr zone and closer to the
center of depression must not exceed 10 to 15 kilometers near the
valley's boundary.
Consequently, the Neocene structures measuring in length up
to 30 kilometers form a common cover over at least two Paleocene
Naturally, this discrepancy in the tectonics of Neocene and
Paleocene structures "the 'latter :buried under the former) considerably
complicates the exploratory drilling operations, if the axes of those
structures are shifted.
The cause of this, discrepancy may undoubtedly be seen in. a
long interruption of sediment acPumulation as well as erosion of a
considerable portion of Molassic layer on anticline sides ancl'Oen
of the underlying Paleocene and joartially:Cretaceous deposits, ,as
this, for example, is seen from a section through the Yuzhnyy
Alamyshik depost (Figure 1).
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Te development of anticlinal told under the condition? of
progreaeive folding) of maw) continued on durtn the lateral
ruption of sediment 4v:cumulations broulon procesuou which create a
surfaoe relief muut have; played An eesential role in the shaping
of anticlinal folds, I: a volley was formed in the vioinity of an
area under consideration, then the abeenoe of upthruat facilitated
a gradual overlapping of the growing anticlinal folds in this
direction. As a result of erosion, the load upon the entire layer
of sediments resting on top and causing the plicative character of
folding wss destroyed; for the samu reason, there also developed dis-
junctive dislocations exemplified in the upthrust of anticlinal sides
in the direction of the valley and in addition to that, in the forma-
tion of cross folds of small amplitude.
We have accumulated actual material from the absolute markings
pertaining to the sole position of the Sokha series in drilling holes;
the results are summarized in the table.
Absolute marking for the sole
Names of areas of the Sokha series
(anticlines) northern side, southern side,
m in
Yuthnyy Alamyshik +400 +250
Andizhan +375
'Palvantash +370 *200
.Nayman +100 S -70
Khodzha-Osman +50 -120
40
The spread of erosion .1.1 Paleocene structures is most clearly
apparent in a southeasterly direction when one compares data referring
, 44, 111
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to the Palvantash and Khodaha?Ototan entiolinesi the latAer Wang
!situated southellst of the former. Thus an Abool4t4e marking of the
solo of the 6okha curiae on the northern side of'Palvantash is
equal to *370 meter, on the souther eido to *2QQ mattes) on tho
nother side of KhodshamOsman to +50 meters, and on the southern
side of the same to 420 meters.
On the baais of these data one may oeneider the established
regularities in the degree of erosion increase in the southeasterly
direction as proved. Taking into account that the distance between
the Pa4vantash and Khodzha-Osman structures is 4 to 5 kilometers
and the difference in absolute markings for the sole of the Sokha
series is 450 to 500 meters, one can speak of a relatively steep
inclination (1/8 to 1/10) of erosion surface from south to east,
in the direction of the Karachatyrian Paleozoic ridge. This ridge
together with the zone of anticlinal Paleocene structures along
the Talmazar Yuzhnyy Alamyshik line had at a pre-Sokhian time
evidently surrounded a small depression which was elongated from
northeast to southwest.
The Paleocene structures are scarcely of any practical interest
in their central portion so long as the intensity of erosion increased
toward the axial section of the depression. Moreover, even anticlinal
folds, found on the outside of this zone and including Shaarikhan,
Boston, and other folds, will evidently prove to be eroded to a con-
siderable extent.
Even at that time the general denudation surface of the
Fergana valley was sloping westward; to confirm it, one may quote
the very same data from the table, according to which the difference
,WWWWMAIR
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in the walking? Vox, the solo of the bold* aeries between Yuahnyy
Alamyshik and Newman (along the northern sidee) amounts to 300
metere. Since tho distance between these two pointe la about
50 kilometers, an inclination or the order of 060 is produced.
It is not possible, however, on the Was of this material,
to draw any conclusions with respect to asymmetry and compulsory
upsetting of Paleocene folds in the direction of the periphery of
the Fergana valley. If one has to do with the pre-Sokhian erosion,
the development of each individual Paleocene structure will greatly
depend on the relief character of the given area at that time.
This circumstance will undoubtedly also exert influence upon
the axial dislocation of Neocene structures. Under the formation
conditions of Paivantash Yuzhnyy Alamyshik, and other Paleocene
structures discussed above, their simultaneous lifting and upsetting
in a southerly direction caused a strong upthrust of the north
sides and in turn determined the axial dislocation of Neocene struc-
tures to the north.
If, in the process of a continuous development of the
structure, the unity of construction is preserved so to speak,
along with the accumulation of sediments, both on the plan'and in
the profile, then in such a case the, sediments of the Sokha series
were deposited upon the ready-formed folds.
Under these conditions, the sediments of the Sokha series
which were deposited onto a level surface did not participate in the
formation of individual structures when the Paleocene anticlines
grew further; these sediments at once enveloped two or three Paleo-
cene folds like a cover while individual structures were situated
linearly or slightly shifted sidewards.
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However, as the Neocene structure was formed it received the
impressionoo to speak, of the position of the buried anticlines,
and its axis, being somewhat dislocated, had to bend on the plan
while pasning from one buried fold into another. These curvatures
evidently should have appeared with greater clarity in the lower
part af the Sokha series and become more blurred in the upper layers
as the thickness of the series increased.
That this is actually true is confirmed by the available dril-
ling material. The axial curvatures of the Neocene structure em-
phasize the separation of one Paleocene anticline from another; in
other words they indicate the position of their anticlinal terminals.
Geologists, unfortunately, have failed to pay due attention to the
connection between the said axial curvatures and the Paleocene
structural forms. Since the slope angles of the structure axis
are usually quite flat, they attributed it to accidental measure-
ments and attempted to level them off on the map.
From what has been said it follows that the sediments of the
Sokha series played a passive role in the process of fold formation
as they enveloped, so to speak, the Paleocene anticlines. The cap
of the Neocene fold shifted somewhat sidewards depending on the
development of those anticlines. From the viewpoint of S. I.
this is not obligatory in all cases, however, and depends as al-
ready mentioned, on the character of relief which was formed prior
to the settlement of the Sokha series.
There are also divergent opinions on that matter, however.
V Popov [3], who was the first to furnish a genetic
interpretation of axial shifting phenomena in the Fergana valley
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structures, claims that it was caused by the processes of sediment
accumulation which took place simultaneously with continuous techtonic
movsmente. The thickness of the Molassio sediment(' which accumulate
on the growihg anticline folds will be different. In thie case the
thickness of Molasses on the north aides of these folds will be
greater than on the south sides leaning toward the Paleozoic moun-
tainous structures. Reverse relationship must prevail in the North"
Fergana strip. These differences in the thickness of deposits
bring about a successive shifting of bends in the upper layers in
the direction of the Fergana valley.
The dislocation of Neocene axes but to the north in relation
to the axe's of buried Paleocene folds is thus characteristic of
conglomerate structures in south Fergana.
A. M. Gabrilyan and several other geologists accept as true
such an explanation of "rolling axes,' as stated by V. I. Popov.
A quantitative evaluation of axial dislocation, which is
obviously of great significance for ascertaining the position of
exploratory holes, is very difficult to furnish.
Referring to actual data, the magnitude of axial dislocation
varies considerably and makes up as little as 10-15 percent and as
much as 50-60 percent and more, of the Molassic thickness super-
imposed on Paleocene folds. The average dislocation magnitude
may be assumed under certain conditions to equal 1/3 of the
superimposed Molasses. In such a case it is necessary to drill
the first exploratory holes in the closed Neocene structures of this
area, 300-500 meters due south of the surface axis.
, A 4
Ittko,
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Under these conditions; which handicap the disposition of
the first exploratory holes, the data on inolinometrio hole measures,
wants acquire a great aignifioance as long as the well shaft dis-
tortion in the great majority of cases occurs upward along the layer
upthrusts
The following circumstance affecting the delineation of the
structures deserves attention. The geological map of Fergana shows
in the northeast of the zone of adyr-type structures, folds which
depart at a sharp angle from the basic anticlines, these being
elongated in a northeasterly direction. These omoustaches," as
they are called, furnish the idea of fold virgation which has no
relationship with the general structure plan of Fergana.
According to S. I. il'in [2j, these are not anticlines) and
their origination is due to entirely different causes.
As already mentioned the Sokha series was deposited on an
eroded surface, the relief of which had reflected the local tec-
tonic structure. The anticlines rose over the synclines between
them in the course of a further development of tectonic processes
and simultaneously with the accumulation of the sediments belonging
to the Sokha series. As the structures were situated in echelons
at a distance of several kilometers from one another) abridge was
formed in the relief during its upheave; the bridge led from one
anticlinal elevation to another and was bound by a synclinal
depression on one side and by a general monoclinal slope on the
other) the latter being formed by the outer side of one anticline
and a part of the side of another anticline. Figure 2 shows
various cases of connection between the Paleocene structures.
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As the Soft series enveloped thou? anticlines) being itself
a product of such a tectonic structure, it formed paeudomanticlines.
On the spot those ',moustaches,' aro out off owing to contemporary
erosion) they are ounnected with a single basic structure. Their
presence may serve, to some extent, us an indication of a direction
where another anticline buried under the cap of contemporary forma-
tions may be found.
It is necessary, furthermore, to dwell on the characteristics
of structures in northeast Fergana, especially on those of Mgyli-su
and Isbaskent.
On account of their construction peculiarities, the axial
surfaces of the latter flexure-shaped folds will reflect on the sur-
face in the Neocene deposits with lesser intensity than in the
aforementioned case of structures in the adyr strip in southeast
Fergana. The bends of the Neocene axis, which are quite evident in
that area, here will be more subdued.
Evidently, the exploration of these flexure-shaped folds piled
up on the surface in the form of Molasses will be considerably more
complex.
The construction of such structures as Ak-chop, .A.mbell, and
Supe-tau in northwest Fergana is entirely Unclear; they feature the
phenomena of diapirism in Neocene deposits and probably the lack of
agreement in tectonics of both Neocene and Paleocene.
The Fergana valley faces the urgent problem of prospecting
for new buried Paleocene structures located closer to the central
portion of the valley, perhaps in its very center, and concealed under
-10-
ity
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the cover of contevorary formatione. Thie problem OAA be eolved
only by giving preference to gravimetric reeearch which will furnigh
a general idea an IA the location cundittons or the curfaoo or the
paloposoio substrata.
Evident4, and in contrast to the prevailing views, the depth
of the Paleozoic substrata in the central portion of the valley does
not exceed 2 to 3 kilometers, If this is proved, then the reserves
of petroleum-bearing lands will incroase many times.
There exists a good possibility that the thickness of Molassic
deposits in the central portion will decrease. Another possibility
is also not ruled out, namely, that the phenomenon of sediment erosion
prior to the deposition of the Sokha series, which is revealed in
the vicinity of depression boundaries, will appear here with much
less intensity, and possibly will be absent altogether in the center
of depression.
Under these conditions, the difference is tectonics of both
Neocene and Paleocene, which is noticeable in the structures in the
adyr zone, will come to light here with considerable lessening and,
perhaps, will disappear altogether during a continuous process of
deposit sedimentation.
All these factors, including also the regional distribution
of petroleum phases, permit an optimistic evaluation f prospects
in the central portion of the valley, provided the supposition of
a shallow depth for the Paleozoic foundation is confirmed.
There is a certain danger in applying such geophysical
prospecting methods as gravimetry and electro-prospecting in search
for buried structures. For this reason seismic methods must be used.
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The Ilmoustachen direction showing location of aconnecting
anticline may be ueed in the search for buried etructures, especially
at the inner periphery of the adyr sone.
Ueophysical work in this region suffers under particularly
unfavorable conditions owing to the development of coarse fragmentary
accumulations in the Molasses. Drilling as deep as 20U-300 meters
may therefore be necessary in order to probe the structures as may
the correlation of the holes according to core sampling diagrams.
Should this method be justified, the problem of prospecting will be
considerably facilitated.
In conclusion, we would like to dwell on the problem of
selecting new areas for exploratory drilling, or more exactly) on
the criteria which must prevail, in our view, during the drilling,
as well as on the methods of conducting exploratory drilling.
The study of the history of Tertiary period in the Fergana
depression as well as the analysis of Paleocene phases and petro-
leum-bearing areas of the productive horizons indicate the absolute
necessity of giving first preference to deep prospecting in the
anticline folds found in the eastern portion of the Fergana valley.
Both the thickness of oil-bearing -strata and the nuMber of productive
horizons are on the increase in the latter. Such an importeat factor
as is the qualitative content of the crude, which markedly improves
in Fergana from west to east may also be cited in favor of superiority
of the, eastern portion of the valley over the western portion.
In view of these considerations) geophysical investigations
in the central portion of the valley ought to be started from its
eastern side. There is no general agreement among geologists as to
%
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tho methods of conducting deep exploratory drilling in the closed
structures in the Fergana valley. The exploration of the largest
possible number or areas where, as a rule, only a single hole woo
drilled has constituted the standard procedure until now, it perm
mitted acoumulatton of exhaustive actual material for passing a
judgment on the atructure of theae folds,. It is doubtful, however,
whether this method may be retained in the future.
A. M. Gabrillyan claims that starting the first exploratory
hole in reliance on the data furnished by surface geology makes it
hard to assure that the presumable petroleum-bearing Paleocene will
be opened up in the top portion of the buried structure.
It is necessary to do simultaneous drilling by two rigs at
new places in order to accelerate the exploration, which does not
increase the risk of getting a higher percentage of dry holes.
The first exploratory hole must be fixed with regard to the
axial deflection: in a southerly direction from the surface axis in
the south Fergana strip, in a northerly direction in the north Fergana
strip; the second holes are fixed along the surface axis. After the
limiting Paleocene horizons have been opened up by two holes, the
third hole is drilled either between them or in the upthrust direc-
tion of the Paleocene strata revealed in holes 1 and 2. If this
system of drilling is used, it is advisable to increase the distance
between the holes in the profile up to SOO meters.
S. I. Ii in is in agreeMent, on the whole j with the necessity
of reducing the time tor exploratory work 'and conducting the drilling
by two riga in' the same section,
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As far so the inner @dips of the folda are concerned, hq la
not lure whether the relationship in position of the Neocene and
P111000101 MO remain in force in thia ease, too. The eAploration
or bovernyy AlAmyshik will ftrnish th4 mo4orial needed for the
tinal solution of tine given proulem.
CONCLUSIONS
1. A considerable quantity of large anticlinal structures
to be explored or which are being explored by deep drilling, as
well as the general geological factors which are favorable for
prospecting for new buried structures in tho central portion of
the valley, make it possible to state that the problem of "abundant
Fergana crude oil" may be solved successfully if drilling operations
are developed correspondingly.
2. There are established instances of a sharp angular non-
conformity between the Okha series and the underlying series, the
latter being eroded as much as the upper chalk.
One may also consider as proved the phenomenon of axial
deflection in the case of anticlines in Fergana, which undoubtedly
must be kept in mind while fixing position of the first exploratory
holes.
REFERENCES
:Ellin, S. I., Minerallnyye istochniki Sang-khok [Mineral Sources
in Sang-khok]. Uch. Zap. Stalinab.
S. I., Problema neftenosnosti Sredney Azii [The Problem of
?Petroleum-Bearing Prospects in Central Asia] Izv. AN Tadzh, SSR
No 3, 1943
A )
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3e Popov, V. IS, (lenesie metodika ieolodevaniya kaynosoyekikh
malefic Fergany [Ori4in and hecearch t?ietliode of Cenozoic
Molaueee in Ferganali Trudy ISredneaziatfekey net? lonf.,
lyul, AN Uzts imohkont, 1945e
El. .
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VNCLA55IFILD 44.4441wu Uh17
Figure, 1, Cross-Section Ihimail the 9eo1oOcal Profile
1-Sokha deposits; 2-Chagatayskiy series - Massagetskiy stage;
2-Upper Fergana series - Sumsarskiy stage; 3 - Upper Fergana series -
Xhanabadskiy, Isfarinskiy and Rishtanskiy stages; 5-Lower Fergana
series - Turkestenskiy and Alayskiy stages; 6-Sogbiyskiy series -
Suzkskiy and Bukharskiy stages; 7-upper chalk (Goznau gympsum);
8 - upper thalk; 9 - conglomeration.
Th
Figure 2. Various Cases of 11102.11141cla Lau the Buried
Paleocene FoldsUnder a Single Neocene Structure.
1-Subterranean relief of Paleocene structures; 2-axis of
Neocene structures; 3-axis of Paleocene structures.
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STAT
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