Assiut university researches
‫درا سات ب ال ي نول وج ية ع لى ال ت تاب ع ال تحت سطحى‬
)‫ب شمال خ ل يج ال سوي س (م صر‬
Maher Ibrahim El-Soughier
‫ماهر اب راه يم ال ص غ ير‬
Abstract:
Abstract This study is based on the analysis of two boreholes
samples (GS9-1 and GS24-1 wells) from offshore northern
gulf of suezarea,Egypt.Nearly 1440ft of upper carboniferous
to lower Permian strata were Investigated palynologicaly from
the Gs-9-1 borehole,offshore northern Gulf of Suez,Egypt,in
which this dated is based on presence of
SpelaeotriletesOwensii,Cannanoropllisand Laevigatosporites
vulgaris These are overlain by a Triassic interval in which the
present palynomorphs failed to Assign its Exact age.this
succession is overlain by middle to upper Jurassic sequence
From depth 4410ft-to depth 5910ft,dated as upper bathonianlower oxfordian Based on evidence of
dinocysts(e.glithodiniajurassicaandSystematophora
Penicillata).Its overlain by Upper Jurassic sections which
recorded as Oxfordian-Tithonian from depth 3950ft to depth
4300ft,based on The combined evidence of
dinocysts(e.g.Dichadogonyaulaxpannea) and Miospores
(e.g.Cicatricosisporites). The sediments of upper
cretaceous,which are reported between depth of 3710 to
Depth 3980ft, terminate the borehole succession.this last
interval is dated as upper Cenomanian based on the
presence of idex angiosperm pollen(e.g. Scabratriporites
Simpliformis ).A major hiatus is recorded in the studied
well,based on the absence of At least, the upper
Permian,lower Jurassic and lower cretaceous palynoflora.
Palynomorphs and palynofacies analysis pointed that upper
carboniferous to the "So-called" Triassic succession was
deposited in acontintental environment with minor Marine
influence at certain horizons(sample 2) from the abundant of
land derived Elements(spores,pollen and organic debris).this
phase wase followed by shallow Marginal marine
conditions,which continued during the Upper Cenomanian
from the Dominated of terrestrial palynomorphs with
increased in percentage of marine elements (dinoflagellate
cysts, marine acritarches and microforaminiferal test
linings)which indicates Unequivocal marine origin of
sediments. Also,2100 ft upper Jurassic strata were
investigated palynologicaly From the GS24-1 borehole,which
is dated as middle-Upper Jurassic(Upper Bathonian- Lower
Oxfordian) based on marker dinoflagellate
cysts(lithodiniajurassicaand Systematophorapenicilla).The
sediments of intervals(between depths of 7230ft-6090ft) Are
dated as Cenomanian age based on the presence of index
angiosperm pollen
(Afropolliskahramanensis,TricolporopollenitesandTriporites
sp.).this interval is overlain By apreviously dated TuronianLower Senonian interval in which the present palynomorphs
Did not give direct age.Previsionally designated as
"Undifferentiated Upper Cretaceos". A major unconformity is
also recorded in this borehole,based on the absence of the
Lower Cretaceous sediments.Thepalynomorphs and
palynofacies were also reported from this Borehole which
suggest contintal to marginal marine environments for the
lower part of The Middle-Upper Jurassic and a marginal
marine environment for most of the Midlle- Upper
Jurassic,Cenomanian and Undifferentiated Upper Cretaceous
sequences.