Temat: sequence stratigraphy

Skocz do pozycji: 1.

Tytuł:: Structural and seismic sequence stratigraphy analysis of seismic and biostratigraphy data from an onshore field, Niger Delta, Nigeria
Autorzy:: Emujakporue, G. O.
Eyo, A. J.
Tematy:: Niger Delta
Sequence stratigraphy
faults
horzons
seismic; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1078525.pdf Link otwiera się w nowym oknie
Opis:: The structural and sequence stratigraphy of a Niger Delta onshore field has been analysed from seismic and biostratigraphy data in order to assess the hydrocarbon potential of the area. Seven faults F1, F2, F3, F4, F5, F6 and F7 were delineated in the seismic sections. The faults, F1, F4, F6 and F7 are synthetic faults, while F2, F3 and F5 are antithetic. Two horizons H1 and H2 were identified in the seismic sections within the time window of 2200-2600 ms. The seismic sequence stratigraphy analysis revealed five sequence boundaries S1, S2, S3, S4 and S5, which represent four depositional sequences. Four maximum flooding surfaces (MFS) were also delineated in the seismic data. The analysis of the biostratigraphy data thus revealed four sequence boundaries (S1, S2, S3, S4) and three maximum surfaces (MFS1, MFS2 and MF3). The age of the sequence boundary ranges from 13.1Ma to 8.3 Ma. The age of the observed maximum flooding surfaces ranges from 12.8 Ma to 9.4 Ma. In vertical succession, the depositional sequences were identified by the order; sequence boundary, lowstand system tract (LST), Transgressive system tract (TST), Maximum flooding surface (MFS), and Highstand system tract (HST). The lowstand system tract is made up of stacking pattern of sand, while the transgressive system tract thinned into the condense section.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Sequence stratigraphy of the Oxfordian to Tithonian sediments (Baisakhi Formation) in the Jaisalmer Basin
Autorzy:: Pandey, D. K.
Pooniya, D.
Tematy:: sequence stratigraphy
Oxfordian–Tithonian
Jaisalmer
stratygrafia
Oksford
tyton; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2077325.pdf Link otwiera się w nowym oknie
Opis:: The Oxfordian to Tithonian sediments deposited along the southern Tethyan margin exhibit very diverse sedimentary facies. The Jaisalmer Basin, situated along the northwestern margin of the Indian peninsula, is a good example of those preserving these sediments (Baisakhi Formation). The scattered nature of the outcrops, due to peneplanation and desert sand cover, and the diversity in sedimentary facies, have led earlier workers to employ a confusing lithostratigraphy and lithostratigraphic correlations. New records of ammonites, more detailed facies description and the application of the sequence stratigraphic method helped to sort out the stratigraphical problems of these isolated outcrops. The complexity of the Oxfordian-Kimmeridgian-Tithonian sediments present in the Jaisalmer Basin, as evidenced by ammonite finds can be traced along an onshore – offshore transect. Within the Oxfordian-Tithonian strata of the Baisakhi Formation, Jaisalmer Basin, 35 parasequences grouped into three depositional sequences (TST-HST/FSST) have been recognized. In at least two cases, the maximum flooding surfaces (MFS) are superimposed on the transgressive surfaces within very condensed sections. The parasequences belong to a continuous succession representing shoreface (deepest part of the basin) to foreshore (shallowest part of the basin). During deposition of the Tithonian succession the southern part of the basin witnessed shallow, nearshore, or foreshore to fluvial depositional environments and, consequently, contains several depositional gaps and less distinct parasequences. The chronological order of the parasequences has been established on the basis of ammonites: Oxfordian – Perisphinctes (Dichotomosphinctes) sp. and P. (Dichotomoceras) sp.; Kimmeridgian – Torquatisphinctes alterniplicatus (Waagen) and Pachysphinctes aff. major Spath; Tithonian – Aulacosphinctoides sp., Virgatosphinctinae and other zonal ammonites recorded by earlier workers. The most logical facies correlation in conformity with Walther’s law was also used. Unfortunately, no marker beds have been recognized; however, the record of at least two brackish-water phases helped in the understanding of depositional settings along the onshore-offshore transects during these time intervals. In general, the Kimmeridgian-Tithonian part of Baisakhi Formation exhibits a general coarsening-upward trend and a change from lower shoreface zone to fluvial environments. The three sequence cycles interpreted within the Oxfordian-Tithonian sediments in the Jaisalmer Basin correspond to second-order sequence cycles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Distribution of sedimentary organic matter in Anisian carbonate series of S Poland : evidence of third-order sea-level fluctuations
Autorzy:: Götz, Annette E.
Szulc, Joachim
Feist-Burkhardt, Susanne
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Diagenesis, sequence stratigraphy and reservoir quality of the Carboniferous deposits of the southeastern Lublin Basin (SE Poland)
Autorzy:: Kozłowska, Aleksandra
Waksmundzka, Maria I.
Tematy:: diagenesis
sequence stratigraphy
reservoir quality
Carboniferous
Lublin Basin; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2059687.pdf Link otwiera się w nowym oknie
Opis:: This study estimates the reservoir properties of the Carboniferous deposits in the southeastern part of the Lublin Basin based on diagenetic and sequence stratigraphic patterns. Depositional sequences distinguished represent the following environments/processes: shallow clay and carbonate shelves, deltaic, fluvial, and hyperconcentrated flow while para-sequences (cyclothems), maximum regression-initial transgression surfaces (T), maximum flooding surfaces (MFS) and also lowstand (LST), transgressive (TST) and highstand (HST) systems tracts have been recognised. Sequences recognized may be linked to the global stratigraphic division of the Carboniferous, thus providing a time framework and environmental context for petrographic and petrophysical examinations. The reservoir properties were found to be clearly controlled by depositional environment, diagenetic history and burial. The best properties were recognized in sandstone lithosomes formed in braided, meandering and anastomosed fluvial channels and hyperconcentrated flows which fill the incised valleys and belong to the LST. They are characterized by good porosity reaching up to 15.1%. The TST and HST deposits are represented chiefly by claystones, mudstones and limestones that formed in a shallow shelf and deltaic environment, being sealing intervals. The diagenetic history of sandstones comprises eo-, meso- and telodiagenetic phases. The major processes acting during the first of these were mechanical compaction, dissolution of mineral grains, formation of predominantly quartz overgrowths around the quartz grains, and crysialiizaton of kaolinite. During mesodiagenesis, cementation with quartz, kaolinite and carbonates continued along with the formation of dickite and fibrous illite; moreover, mineral grains were dissolved and chemical compaction set in. The effects of telodiagenetic processes were feldspar dissolution and precipitation of kaolinite. During diagenesis the maximum temperature affecting the Carboniferous deposits was ~120°C. Compaction and cementation were the main factors responsible for the reduction of porosity by approximately 55 and 38%, respectively. One of the major diagenetic processes was dissolution resulting in the formation of secondary porosity. The Serpukhovian and Bashkirian sandstones from sequence 11 show good reservoir potential, while those from sequences 6, 9, 10, 12-14 only fair potential.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Sea-level dynamics and palaeoecological factors affecting trace fossil distribution in Eocene turbiditic deposits (Gorrondatxe section, N Spain)
Autorzy:: Molina, Eustoquio
Payros, Aitor
Uchman, Alfred
Apellaniz, Estibaliz
Orue-Etxebarria, Xabier
Rodríguez-Tovar, Francisco J.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Bajocian transgressive-regressive sequences of the Tecocoyunca Group, southern Mexico, with maximum flooding surfaces marked by Thalassinoides
Autorzy:: Pieńkowski, Grzegorz
Martini, Michelangelo
Zepeda-Martínez, Mildred
Tematy:: Mexico
Jurassic
Thalassinoides
maximum flooding surfaces
siliciclastic sequence stratigraphy; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2058570.pdf Link otwiera się w nowym oknie
Opis:: Bajocian (Middle Jurassic) transgressive-regressive sequences (TRS), outcropping in the Rosario Nuevo Creek (Tezoatlán Basin, Tecocoyunca Group) in Oaxaca State, Mexico, represent one of the Jurassic phases of opening and widening of a trans-Pangaean marine corridor (called also the Hispanic Corridor) and show a retrogradational-progradational set of sedimentary successions with decipherable and diverse facies. Two TRSs have been distinguished. The lower one starts with fluvio-deltaic sandstones including pedogenic horizons. Drowning of the deltaic plain and gradual rising of the water table is marked by change in vegetation: from large trees to low-rise vegetation with characteristic clumps of dense roots cemented by siderite. The delta plain succession is topped by a thin coal seam, followed by a transgressive surface. Ensuing laminated mudstones of restricted marine origin pass into open marine deposits, represented by bioturbated heterolithic strata with ammonites followed by nearshore sandstones, deposited in a storm-dominated basin. A similar succession, although without the deltaic part, is repeated in the next TRS. Of note are two thin (15-20 cm) continuous beds with Thalassinoides isp. networks, present within open marine deposits. Although large Thalassinoides networks are mostly known from shallow-marine and coastal environments, the case from Mexico represents less common occurrences from a deeper marine (offshore) setting, associated with maximum flooding surfaces, sediment starvation and firmgrounds (Glossifungites ichnofacies). Occurrences of Thalassinoides meshes, precisely marking maximum flooding surfaces, are helpful in defining the hierarchy of sequence stratigraphic cycles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Badenian evolution of the Central Paratethys Sea : paleogeography, climate and eustatic sea-level changes
Autorzy:: Kováč, Michal
Bajraktarević, Zlatan
Harzhauser, Mathias
Nagymarosy, András
Filipescu, Sorin
Oszczypko, Nestor
Saftić, Bruno
Studencka, Barbara
Rögl, Fred
Sliva, Ubomír
Andreyeva-Grigorovich, Aida
Brzobohatý, Rostislav
Pavelić, Davor
Fodor, László
Opis:: The Miocene Central Paratethys Sea covered wide areas of the Pannonian Basin System, bordered by the mountain chains of the Alps, Carpathians and Dinarides. The epicontinental sea spread not only in the back-arc basin area, but flooded even the Alpine-Carpathian Foredeep, situated along the front of gradually uplifting mountains. The Early Badenian (early Langhian) transgressions from the Mediterranean toward the Central Paratethys realm, via Slovenia and northern Croatia (Transtethyan Trench Corridor or Trans Dinaride Corridor) flooded the Pannonian Basin and continued along straits in the Carpathian Chain into the Carpathian Foredeep. The isolation of eastern parts of the Central Paratethys at the end of this period (late Langhian) resulted in the "Middle Badenian" salinity crisis. Thick evaporite sediments, above all halite and gypsum were deposited in the Transcarpathian Basin, Transylvanian Basin and Carpathian Foredeep. During the Late Badenian (early Serravallian), the latest full marine flooding covered the whole back-arc basin and a great part of the foredeep. The main problem is to create a model of sea connections during that time, because some authors consider the western Transtethyan Trench Corridor (Trans Dinaride Corridor) closed and there is no evidence to prove a supposed strait towards the Eastern Mediterranean. A proposed possibility is a connection towards the Konkian Sea of the Eastern Paratethys. The Badenian climate of the Central Paratethys realm can be characterized as fairly uniform, reflecting the stable subtropical conditions of the Miocene Climatic Optimum. No considerable changes in terrestrial ecosystems were documented. Nevertheless, evolution of steep landscape associated with rapid uplift of the East Alpine and Western Carpathian mountain chains (including high stratovolcanoes) caused development of vertical zonation of dry land and consequently close occurrence of different vegetation zones in a relatively small distance during this time. In the Central Paratethys Sea a slight N-S climatic gradient seems to be expressed already from the Early Badenian, but a biogeographic differentiation between basins in the North and South starts to become more prominent first during the Late Badenian, when a moderate cooling of the seawater can also be documented. The Late Badenian sea-level highstand coincides with the appearance of stress factors such as stratification of the water column and hypoxic conditions at the basin bottom in the whole area. Taking into account all bioevents and changes of paleogeography in the Central Paratethys realm, we can very roughly correlate the Early (and "Middle") Badenian with the eustatic sea-level changes of TB 2.3, TB 2.4 or Bur5/Lan1, Lan2/Ser1 and the Late Badenian with TB 2.5 or Ser2 cycles (sensu Haq et al. 1988; Hardenbol et al. 1998). Generally, we can assign the Early Badenian transgressions to be controlled by both, tectonics (induced mainly by back-arc basin rifting) and eustacy, followed by forced regression. The Late Badenian transgression and regression were dominantly controlled by sea-level changes inside the Central Paratethys realm.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 8.

Tytuł:: Middle Triassic evolution of the Tatricum sedimentary basin : an attempt of sequence stratigraphy to the Wierchowa Unit in the Polish Tatra Mountains
Autorzy:: Jaglarz, P.
Szulc, J.
Tematy:: basin analysis
paleoenvironments
sequence stratigraphy
late Scythian-Ladinian
Tatra Mts.; Pokaż więcej
Wydawca:: Polskie Towarzystwo Geologiczne
Powiązania:: https://bibliotekanauki.pl/articles/191483.pdf Link otwiera się w nowym oknie
Opis:: The paper focuses on paleoenvironmental reconstruction and sequence stratigraphy of the Tatricum Basin for the late Scythian-Ladinian interval. The reconstruction is based on observations carried out in the Kominiarski Wierch section, situated in the Polish part of the Tatra Mts. Sedimentological and geochemical studies indicate that during middle Triassic time the Tatricum Basin was situated upon an isolated and restricted carbonate platform dominated by shallow water carbonate and evaporitic sedimentation. The basin was a tectonically stable area controlled by eustatic fluctuations. Incipient tectonic movements first occurred in late Ladinian time only. The studied sedimentary succession is composed of several stacked, shallowing-upward cycles that are interpreted as 3rd order depositional sequences. The constructed sedimentary sequence framework corresponds well with the sequence stratigraphic scheme of the Northern Alpine Triassic and enables a better chronostratigraphic resolution of the Triassic in the Tatra Mts.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Middle Triassic evolution of the Tatricum sedimentary basin : an attempt of sequence stratigraphy to the Wierchowa Unit in the Polish Tatra Mountains
Autorzy:: Jaglarz, Piotr
Szulc, Joachim
Opis:: The paper focuses on paleoenvironmental reconstruction and sequence stratigraphy of the Tatricum Basin for the late Scythian Ladinian interval. The reconstruction is based on observations carried out in the Kominiarski Wierch section, situated in the Polish part of the Tatra Mts. Sedimentological and geochemical studies indicate that during middle Triassic time the Tatricum Basin was situated upon an isolated and restricted carbonate platform dominated by shallow water carbonate and evaporitic sedimentation. The basin was a tectonically stable area controlled by eustatic fluctuations. Incipient tectonic movements first occurred in late Ladinian time only. The studied sedimentary succession is composed of several stacked, shallowing-upward cycles that are interpreted as 3rd order depositional sequences. The constructed sedimentary sequence framework corresponds well with the sequence stratigraphic scheme of the Northern Alpine Triassic and enables a better chronostrati- graphic resolution of the Triassic in the Tatra Mts.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Sediment discharge and storage over the last deglacial highstand period on the central Vietnam shelf off Nha Trang
Autorzy:: Dung, Bui Viet
Stattegger, Karl
Kieu, Nguyen Van
Thanh, Nguyen Trung
Thong, Bui Xuan
Vu, Pham Nguyen Ha
Man, Ha Quang
Trang, Pham Hong
Tematy:: sediment budget
Nha Trang shelf
central Vietnam
Holocene highstand
sequence stratigraphy; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2058662.pdf Link otwiera się w nowym oknie
Opis:: A sediment budget for the central Vietnam shelf off Nha Trang over the last deglacial Holocene highstand period has been investigated on the basis of shallow seismic and sediment core data and empirical equations. The annual suspended sediment discharge to the Nha Trang shelf ranges from: 4.3 to 5.4 Mt/year. Estimates based on published empirical equations suggest that the sediment discharge by three main local mountainous rivers (the Cai, Dinh and Van Phong rivers) that enter the Nha Trang shelf ranges between 1.7 and 4 Mt/year, which implies that the local rivers discharge approximately 75% of the total annual sediment input to the shelf. The annual sediment supply of the Cai River is approximately 2 and 6 times higher than that of the Dinh and Van Phong rivers, respectively. The highstand sediment depocentre of the Nha Trang shelf is mostly attached to the local river outflows, indicating their importance as the principal sediment supply sources to the shelf. Additional sources of sediment supply to the Nha Trang shelf can probably be related to along-shore transport from the nearby shelves. Calculations based on seismic and sediment core data indicate that the net sediment volume storage on the Nha Trang shelf is approximately 2.15 Mt/year. Approximately 50% of the total sediment yield supplied to the shelf is probably transported along-shore to the south. The sediment budget model for highstand deposits on the Nha Trang shelf is typical for a small mountainous river basin, which is significantly different from that of the large river delta systems in Vietnam such as the Mekong and Red rivers where 90% of the river sediments are captured on the delta plain/subaqueous part and only 10% of the river sediments are transported to the nearby shelf. In contrast, most of the sediments supplied by small mountainous rivers off Nha Trang are transported to the mid-shelf, forming a shore-parallel mud depocentre.
Dostawca treści:: Biblioteka Nauki

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