Sequence stratigraphic architecture of the Upper Jurassic-Lower Cretaceous deposits in the Sayun-Masilah Basin, Yemen: A case study from Masilah oilfields

2020 ◽  
Vol 192 ◽  
pp. 104287 ◽  
Author(s):  
Nabil M. Al-Areeq ◽  
Mohamed M. Elhossainy ◽  
Abdelhamid M. Salman
Keyword(s):  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Sequence Stratigraphic ◽  
Stratigraphic Architecture ◽  
Cretaceous Deposits

scholarly journals Palaeoecological analysis of maximum flooding zones from the Tithonian (Upper Jurassic) of the Kachchh Basin, western India

Facies ◽  
2020 ◽  
Vol 67 (1) ◽  
Author(s):  
Franz T. Fürsich ◽  
Matthias Alberti ◽  
Dhirendra K. Pandey
Keyword(s):  
Upper Jurassic ◽  
Carbonate Content ◽  
Western India ◽  
Rift Basin ◽  
Benthic Assemblages ◽  
Depositional Sequence ◽  
Sequence Stratigraphic ◽  
Stratigraphic Architecture ◽  
Kachchh Basin ◽  
Rich Fauna

AbstractThe siliciclastic Jhuran Formation of the Kachchh Basin, a rift basin bordering the Malagasy Seaway, documents the filling of the basin during the late syn-rift stage. The marine, more than 700-m-thick Tithonian part of the succession in the western part of the basin is composed of highly asymmetric transgressive–regressive cycles and is nearly unfossiliferous except for two intervals, the Lower Tithonian Hildoglochiceras Bed (HB) and the upper Lower Tithonian to lowermost Cretaceous Green Ammonite Beds (GAB). Both horizons represent maximum flooding zones (MFZ) and contain a rich fauna composed of ammonites and benthic macroinvertebrates. Within the HB the benthic assemblages change, concomitant with an increase in the carbonate content, from the predominantly infaunal “Lucina” rotundata to the epifaunal Actinostreon marshii and finally to the partly epifaunal, partly infaunal Eoseebachia sowerbyana assemblage. The Green Ammonite Beds are composed of three highly ferruginous beds, which are the MFZ of transgressive–regressive cycles forming the MFZ of a 3rd-order depositional sequence. The GAB are highly ferruginous, containing berthieroid ooids and grains. GAB I is characterized by the reworked Gryphaea moondanensis assemblage, GAB II by an autochthonous high-diversity assemblage dominated by the brachiopods Acanthorhynchia multistriata and Somalithyris lakhaparensis, whereas GAB III is devoid of fossils except for scarce ammonites. The GAB are interpreted to occupy different positions along an onshore–offshore transect with increasing condensation offshore. Integrated analyses of sedimentological, taphonomic, and palaeoecological data allow to reconstruct, in detail, the sequence stratigraphic architecture of sedimentary successions and to evaluate their degree of faunal condensation.

scholarly journals Geology of the Upper Jurassic to Lower Cretaceous geothermal aquifers in the West Netherlands Basin – an overview

2020 ◽  
Vol 99 ◽  
Author(s):  
Cees J.L. Willems ◽  
Andrea Vondrak ◽  
Harmen F. Mijnlieff ◽  
Marinus E. Donselaar ◽  
Bart M.M. van Kempen
Keyword(s):  
Lower Cretaceous ◽  
Cold Water ◽  
Upper Jurassic ◽  
The West ◽  
Geothermal Heat ◽  
Sequence Stratigraphic ◽  
Tectonic History ◽  
Water Breakthrough ◽  
Hydrocarbon Fields ◽  
Sedimentary Aquifer

Abstract In the past 10 years the mature hydrocarbon province the West Netherlands Basin has hosted rapidly expanding geothermal development. Upper Jurassic to Lower Cretaceous strata from which gas and oil had been produced since the 1950s became targets for geothermal exploitation. The extensive publicly available subsurface data including seismic surveys, several cores and logs from hundreds of hydrocarbon wells, combined with understanding of the geology after decades of hydrocarbon exploitation, facilitated the offtake of geothermal exploitation. Whilst the first geothermal projects proved the suitability of the permeable Upper Jurassic to Lower Cretaceous sandstones for geothermal heat production, they also made clear that much detail of the aquifer geology is not yet fully understood. The aquifer architecture varies significantly across the basin because of the syn-tectonic sedimentation. The graben fault blocks that contain the geothermal targets experienced a different tectonic history compared to the horst and pop-up structures that host the hydrocarbon fields from which most subsurface data are derived. Accurate prediction of the continuity and thickness of aquifers is a prerequisite for efficient geothermal well deployment that aims at increasing heat recovery while avoiding the risk of early cold-water breakthrough. The potential recoverable heat and the current challenges to enhance further expansion of heat exploitation from this basin are evident. This paper presents an overview of the current understanding and uncertainties of the aquifer geology of the Upper Jurassic to Lower Cretaceous strata and discusses new sequence-stratigraphic updates of the regional sedimentary aquifer architecture.

Sequence stratigraphic evolution of the Mensa and Thunder Horse intraslope basins, northern deep-water Gulf of Mexico—Lower Cretaceous through upper Miocene (8.2 Ma): A case study

AAPG Bulletin ◽  
2017 ◽  
Vol 101 (07) ◽  
pp. 1109-1143 ◽  
Author(s):  
Paul Weimer ◽  
Renaud Bouroullec ◽  
Todd G. Lapinski ◽  
Aaron A. van den Berg ◽  
Raquel Cepeda ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Deep Water ◽  
Lower Cretaceous ◽  
Sequence Stratigraphic ◽  
Upper Miocene ◽  
Stratigraphic Evolution

scholarly journals Lithology of the Upper Jurassic-Lower Cretaceous deposits of the eastern part of the Myrgovaam and Rauchua depressions, Western Chukotka

2020 ◽  
Vol 65 (4) ◽  
Author(s):  
Elena V. Vatrushkina ◽  
◽  
Marianna I. Tuchkova ◽  
Keyword(s):  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Coarse Grained ◽  
Fine Grained ◽  
Tectonic Environment ◽  
The Matrix ◽  
Siliciclastic Rocks ◽  
Facies Variation ◽  
Felsic Volcanic ◽  
Cretaceous Deposits

Upper Jurassic-Lower Cretaceous deposits were formed on the South-Western margin of the Chukotka terrane in active tectonic environment. Their stratigraphic units characterized by sedimentary structures and lithology similarities, facies variation and scarcity of reliable fauna findings. Detailed lithological studies are necessary due to the absence of a unified approach to the stratigraphic division of deposits. The paper presents petrographic, geochemical, and isotope-geochemical characteristics of Upper Jurassic-Lower Cretaceous rocks. The stages of changing the sedimentation conditions and sources, which determined the differences in sedimentological features and the composition of the studied strata, are reconstructed. The Oxford-Kimmeridgian section is composed of sandy debris flow deposits with an arcosic composition of psammitic differences. Among their sources, ancient granitoids dominated, while siliciclastic rocks, volcanites and metamorphic complexes were secondary. Volgian-valanginian interval is characterized by the accumulation of sediments in various parts of the submarine fan. In Volgian sequences fine -, medium - and coarse-grained turbidites with lenses of small-pebble conglomerates are identified. A large number of simultaneous pyroclastic material in the Volgian deposits indicates the synchronous volcanic activity. In the Volgian period, the province was dominated by volcanites, mainly of the basaltic and andesitic composition, siliciclastic rocks were present in smaller amount. The Berriasin section is composed of fine-grained turbidites with single horizons of medium-grained turbidites and gravelitic lenses, as well as slope deposits in the form of rhythmically interbedded sandstones and mudstones with slump structures. Sandstones have greywacke composition and contain an admixture of ash material in the matrix. The main sources for Berriasian deposits were siliciclastic rocks and felsic volcanic complexes. The Valanginian section is represented by fine and medium-grained turbidites with horizons of amalgamated sandstones. Sandstones are classified as arkoses by the ratio of rock-forming components. The dominant source in the Valanginian time was ancient granitoids, while siliciclastic rocks and volcanites were secondary.

Pupae of Mesozoic Jurochlus Kalugina, 1985 (Diptera: Chironomidae), with description of four new species

Zootaxa ◽  
2012 ◽  
Vol 3478 (1) ◽  
pp. 434-452 ◽  
Author(s):  
ELENA D. LUKASHEVICH ◽  
ANDREY A. PRZHIBORO
Keyword(s):  
New Species ◽  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Systematic Position ◽  
Cretaceous Deposits

The Mesozoic chironomid genus Jurochlus Kalugina, 1985, known only as pupae, is reviewed. Four new species ofJurochlus are described from the Upper Jurassic and Lower Cretaceous deposits of Mongolia, viz. J. trivittatus sp. nov.,J. limbatus sp. nov., J. lineatus sp. nov. (Shar Teg, J 3 ) and J. adustus sp. nov. (Khutel Khara, J 3 /K 1 ). Both previouslydescribed species, J. sibiricus Kalugina, 1985 and J. rigor Kalugina, 1985, are re-described in detail based on re-examination of the holotypes. The diagnosis of the genus Jurochlus is emended and its systematic position (probably Podonominae or Tanypodinae) is discussed.

scholarly journals Volcanogenic material in upper jurassic-lower cretaceous deposits of the Eastern Russian plate and its sources

2021 ◽  
Vol 21 (1) ◽  
pp. 49-57
Author(s):  
Konstantin I. Nikashin ◽  
◽  
Svetlana O. Zorina ◽  
Keyword(s):  
Rare Earth ◽  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Russian Platform ◽  
Island Arcs ◽  
Pyroclastic Material ◽  
Shale Formations ◽  
Igneous Province ◽  
Volcanic Glasses ◽  
Cretaceous Deposits

. Widespread “camouflaged” pyroclastics including smectite, illite-smectite and heulandite are detected in the upper jurassic– lower cretaceous deposits of the Ulyanovsk-Saratov basin. Moreover, volcanic glasses are found in several stratigraphic units. The quantity of pyroclastic material in the study section (17–72%) is probably related to volcanic input in the basin. Concentrations of the trace and rare earth elements point to a predominantly acid source of ash material, except the Promzino and Ulyanovsk black shale formations linked to the mixed andesite-basaltic and felsic sources. Island arcs of the Northern Tethys basin and the High-Altitude Arctic Igneous Province are regarded as probable sources of the pyroclastic influx in the epeiric basin of the Russian Platform in the Jurassic-Early Cretaceous.

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