Naslov
Paleozoic and Mesozoic succession of sediments in Khnifes-1 Well (Syria)

Autori
Ivaniček, Zlata ; Sokolović, Branko ; Stanković, Damir ; Pecimotika, Gabrijela ; Veseli, Vladimir ; Kizmanić, Krešimir ; Koch, Georg

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Knjiga sažetaka - Abstracts Book / Horvat, Marija - Zagreb : Hrvatski geološki institut, 2010, 69-70

ISBN
978-953-6907-23-6

Skup
4.Hrvatski geološki kongres s međunarodnim sudjelovanjem

Mjesto i datum
Zagreb, Hrvatska; Šibenik, Hrvatska, 14.10.2010. - 15.10.2010

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Triassic; Permian; Carboniferous; Lithostratigraphic Formations in Syria

Sažetak
The vertical exploration well Khnifes-1 is located in the Hayan block in Syria, and drilled 3022 m of sediments ranging from the Upper Cretaceous to the Carboniferous. The Palaeozoic sediments composed of mudstone/claystone in places hematitic, quartzarenite (silica, anhydrite and dolomite cement) and rare siltstone and dolomicrite of the Markada Formation (3022–2790 m) has been distinguished at the bottom of the well. In this unit the microfossils have not been found. The Carboniferous age is presumed according to correlation with previous investigated wells. Deposits are formed in transitional (deltaic) and occasionally shallow marine environment. The succession of sediments in Khnifes-1 continues with the Amanus Sand Formation of the Palaeozic (2790–2330 m) consists of quartzarenite and hematitic mudstone/claystone. Fossils have not been found. On the basis of correlation with previously investigated wells, EK logs, and lithology, Permian age is supposed as well as transitional to continental depositional environment. The Amanus Shale Formation of the Lower Triassic (2330–2214 m) made of hematitic shale, follows. Indeks microfossils have not been found in this unit. Very scarcely thin mollusc shells were observed together with some other fossils fragments. The Scythian age is presumed according to correlation with previously investigated wells. Sedimentation probably took place in transitional environment. Next is the Kurrachine Dolomite Formation of Triassic (2214–1590 m) composed of micrite (M), biomicrite (W) in places dolomitic and/or argillaceous, dolomicrite (argillaceous, calcitic and silty-sandy) with primary anhydrite/gypsum and shale. Microfossil association is very poor or almost absent. Only benthic foraminifera Nodosaria sp. has been noticed. Throughout the entire interval ostracods, thin mollusc shells, fragments of echinoderms, gastropods, brachiopods, corals and relicts of foraminifera have been found. The Middle – Upper Triassic age is assumed on the basis of correlation with previously investigated wells. Lithology and microfossil content indicate peritidal – supratidal with sporadic sabkha environment. The Kurrachine Anhydrite Formationof the Triassic (1590–1230 m) consists of argillaceous dolomicrite with early diagenetic anhydrite and gypsum, salt and shale pursues. In this unit the microfossils have not been found. The Middle – Upper Triassic age is presumed according to correlation with previously investigated wells. Lithological characteristics suggest supratidal with sabkha environment. The Butmah Formation of the Upper Triassic (1230–1180 m) is next. Sediments are composed of dolomicrite, argillaceous dolomicrite with anhydrite, less gypsum, crystallinedolomite, shale and chert. Fossils have not been found.The Carnian age is supposed due to the lithological characteristics as well as correlation with similar deposits. Sedimentation took place in peritidal (shallow subtidal –supratidal) environment. The Rutbah Formation of the Lower Cretaceous (1180–1140 m) composed of quartzarenite in places conglomeratic, dolomite (crystalline and dolomicrite) and shale proceeded. In this interval there are no fossil remains. As a result of correlation with previous investigated wells, EK logs and lithology the Lower Cretaceous age has been defined. Lithology and absence of fossils suggest predominantly continental (fluvio-deltaic) environment. The Hayane Formation of the Lower Cretaceous – Upper Cretaceous (1140–1030 m) carries on the Mesozoic series. Sediments are micrite (M), slightly fossiliferous, hematitic and dolomitic, biomicrite (W), dolomicrite and dolopelmicrite in places recrystallized, and sporadically late diageneticdolomite. Only a few fragments of echinoderms, ostracods, mollusc shells, undeterminable benthic foraminifera and relicts of microfossils have been found. Due to acorrelation with previous investigated wells, EK logs, and lithology the whole interval is affiliated to Upper Albian – Middle Cenomanian. Sediments were most probably deposited in restricted shallow marine environment. Next is the Judea Formation of the Upper Cretaceous (1030–740 m). Deposits are predominantly composed of late diagenetic dolomite (finely – medium crystalline), and in lesser amount of early diagenetic dolomite (dolomicrite, dolopelomicrite in places recrystallized and impregnated with organic matter). Fossils are very rare. Only a few fragments of echinoderms, mollusk shells and relicts of microfossils have been found. On the basis of correlation with previously investigated wells, EK logs, and lithology the age of whole interval has been estimated as Upper Cenomanian – Turonian. Sedimentation took place in the shallow subtidal – supratidal environment. The Soukhne Formation of the Upper Cretaceous (740– 530 m), consists of biomicrite (W) interbedded with phosporites, chert and shale, follows. The following foraminifera taxa have been defined the Late Santonian – Early Campanian stratigraphic position of the deposits: Muricohedbergellasp., Macroglobigerinelloides sp., Heterohelix sp., Globotruncana sp., Bulimina sp. and Bolivina sp. In the whole interval, benthic undeterminable foraminifera, mollusc shells and fragments of echinoderms are present too. Lithology and microfossil content indicate deposition in outer shelf to deep marine environment. The Shiranish Formation of The Upper Cretaceous (530–390 m) made of biomicrite (W), rarely argillaceous and sporadically brecciated is next. The microfossils, which define the Late Campanian to Maastrichtian age, are presented by the following planktonic and benthic foraminifera: Macroglobigerinelloides prairiehillensis (PESSAGNO), Macroglobigerinelloides subcarinatus (BROENNIMANN), Gansserina gansseri (BOLLI), Globotruncana aegyptica var. gagnebini (NAKKADY), Pseudoguembelina costulata (CUSHMAN), Globotruncana bulloides (VOGLER), Muricohedbergella sp., Globotruncana sp., Contusotruncana sp., Heterohelix sp., Gavelinella sp., Rugoglobigerina sp., Lenticulina rotulata (LAMARCK), Bulimina sp., Bolivina sp., Gyroidinoides sp., Gaudryna sp. and Marsonella sp. Also, in the association of the whole interval, fragments of molluscs, ostracods, echinoderms as well as undeterminable benthic foraminifera and other recristalized microfossils relicts have been observed. Lithology and microfossil association suggest outer shelf to deep marine depositional environment. Subsequently, there is the Judea Formation (390–10 m) of the Upper Cretaceous again. This formation is brought into abnormal contact with the preceding Shiranish formation by tectonics (fault). Sediments are composed of dolomite (predominatelly late diagenetic, in some places with anhydrite, rare gypsum, and some dolomicrite, dolopelmicrite – recrystallized and fossiliferous), sporadically slightly fossiliferous, dolomitized micrite (M), carbonate microbreccia, and chert. Microfossil association is very poor or almost absent. Throughout the entire interval fragments of thin mollusc shells, undeterminable bentic foraminifera, planktonic foraminifera and other recristalized microfossils relicts have been observed. The Upper Cenomanian – Turonian age of this interval is assumed on the basis of correlation with previously investigated wells. Sedimentation took place in the shallow subtidal – supratidal with sporadic sabkha environment.

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Engleski

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Geologija

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