Article

A re-assessment of the organic maturation and palynostratigraphy of the wells Ruivo-1 and Corvina, offshore Algarve Basin, Portugal

Authors:
To read the full-text of this research, you can request a copy directly from the authors.

No full-text available

Request Full-text Paper PDF

To read the full-text of this research,
you can request a copy directly from the authors.

... However, the samples recovered were almost barren. However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010;Borges et al. 2011;Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted, which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012;Fernandes et al. 2010Fernandes et al. , 2013. ...
... However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010;Borges et al. 2011;Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted, which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012;Fernandes et al. 2010Fernandes et al. , 2013. The Ruivo-1 well has a total depth of 2134 m, with sediments consisting mainly of sandstones and siltstones of Miocene age in the uppermost 659 m (based on calcareous nannofossils and foraminifera). ...
Chapter
Full-text available
Biostratigraphic studies of several sections and a borehole (Belverde) of the Lower Tagus Basin, based on Miocene dinoflagellate cyst assemblages, have allowed a detailed stratigraphic investigation to be conducted. Assemblages are very diverse and abundant and can be used as important biostratigraphic guides. Recently, a palynostratigraphic study based on dinoflagellate cysts was conducted in two offshore wells, Ruivo-1 and Corvina, located in the Algarve Basin (southern Portugal). The recovered dinoflagellate assemblages are less abundant and diverse than those obtained in the Lower Tagus Basin. New inferences are made regarding the correlation between the dinoflagellate cysts known from the Lower Tagus Basin with the assemblages recently recovered from the Algarve Basin. Species of selected dinoflagellate cyst assemblages recovered are similar in both basins. Continuing progress with these new palynological studies and biostratigraphic data will help to refine knowledge of and correlations between Portuguese Miocene deposits.
... However, the samples recovered were almost barren. However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010;Borges et al. 2011;Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted, which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012;Fernandes et al. 2010Fernandes et al. , 2013. ...
... However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010;Borges et al. 2011;Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted, which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012;Fernandes et al. 2010Fernandes et al. , 2013. The Ruivo-1 well has a total depth of 2134 m, with sediments consisting mainly of sandstones and siltstones of Miocene age in the uppermost 659 m (based on calcareous nannofossils and foraminifera). ...
Article
Full-text available
Biostratigraphic studies of several sections and a borehole (Belverde) of the Lower Tagus Basin, based on Miocene dinoflagellate cyst assemblages, have allowed a detailed stratigraphic investigation to be conducted. Assemblages are very diverse and abundant and can be used as important biostratigraphic guides. Recently, a palynostratigraphic study based on dinoflagellate cysts was conducted in two offshore wells, Ruivo-1 and Corvina, located in the Algarve Basin (southern Portugal). The recovered dinoflagellate assemblages are less abundant and diverse than those obtained in the Lower Tagus Basin. New inferences are made regarding the correlation between the dinoflagellate cysts known from the Lower Tagus Basin with the assemblages recently recovered from the Algarve Basin. Species of selected dinoflagellate cyst assemblages recovered are similar in both basins. Continuing progress with these new palynological studies and biostratigraphic data will help to refine knowledge of and correlations between Portuguese Miocene deposits.
... However, the samples recovered were almost barren. However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010; Borges et al. 2011; Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted , which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012; Fernandes et al. 2010 Fernandes et al. , 2013). ...
... However, more recently, palynostratigraphic research has been undertaken in two selected offshore wells, Ruivo-1 and Corvina (Fernandes et al. 2010; Borges et al. 2011; Borges 2012). Although the lithologies are essentially marine carbonates, some samples were collected in clastic facies; this allowed a palynostratigraphic study to be conducted , which has provided new biostratigraphic data based on dinoflagellate cysts (Borges 2012; Fernandes et al. 2010 Fernandes et al. , 2013). The Ruivo-1 well has a total depth of 2134 m, with sediments consisting mainly of sandstones and siltstones of Miocene age in the uppermost 659 m (based on calcareous nannofossils and foraminifera). ...
Chapter
Full-text available
Range tops of 41 dinoflagellate cyst taxa occur within the Upper Triassic to Lower Cretaceous of northwest Europe. These range tops form the basis of a proposed biostratigraphy of the Upper Triassic, Jurassic and Lower Cretaceous strata of the region, the subdivision of which is of value to industrial palynologists who work mainly with drill cuttings from oil and gas exploration boreholes.
Article
The Brora Coal, Brora Argillaceous, Brora Arenaceous, Balintore and Kimmeridge Clay formations of the onshore Moray Firth Basin represent an important Middle to Upper Jurassic (Callovian to Lower Kimmeridgian) reference section close to hydrocarbon‐rich North Sea basins. This composite succession at Brora and Balintore is c. 233 m thick; it is mudstone/siltstone‐dominated and largely rich in zonal and subzonal ammonites. For example, the Callovian succession at Brora is virtually complete, with coverage of all seven ammonite zones. All the five formations examined have yielded abundant palynofloras. The lithostratigraphic units sampled, except the Brora Coal Formation, have yielded rich associations of dinoflagellate cysts. The majority of the Inverbrora Member of the Brora Coal Formation at its type section at Brora is of early Callovian age based on dinoflagellate cysts; this member yielded Meiourogonyaulax caytonensis and Mendicodinium groenlandicum and these species preclude a Bathonian age. This member has been previously attributed to the late Bathonian. Dinoflagellate cysts are diverse and abundant in the overlying Brora Argillaceous to Kimmeridge Clay formations, therefore indicating open marine conditions. The stratigraphic distributions and relative proportions of these Callovian to Lower Kimmeridgian dinoflagellate cyst floras are largely consistent with those reported elsewhere in northern Europe, and the established dinoflagellate cyst biozonations can be readily applied to the Inner Moray Firth Basin. Some taxa, such as Gonyaulacysta dentata, are of distinct Boreal affinity. Furthermore, some minor stratigraphic anomalies were noted, including the range base of Scriniodinium crystallinum being in the early Oxfordian at Balintore. In England and Germany, this bioevent occurs in the late Callovian. Some notable dinoflagellate cyst abundance phenomena were observed. An example of this is the prominence of Korystocysta spp. in the Middle Callovian. This and other quantitative phenomena are of correlative significance. Marine palynomorph diversity increased markedly during the Callovian, stabilizing in the Lower Oxfordian. A suite of characteristic dinoflagellate cysts became extinct in the Middle Oxfordian, and some typically Late Jurassic elements became more prominent at this time. The early Kimmeridgian palynofloras from Ethie are entirely typical of this interval elsewhere in Europe.
  • Davey
Surculosphaeridium vestitum (Deflandre 1939) Davey et al. 1966. Corvina well, Sample CO 2195;
Ruivo-1 well, Sample R10
  • Deflandre Pareodinia Ceratophora
Pareodinia ceratophora Deflandre 1947. Ruivo-1 well, Sample R10; K23