bandeau-08-2016

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Excursions > Pre-meeting excursions

PRE-MEETING FIELD TRIPS

  • FT1 The Eocene marine sedimentation in the Southern Pyrenean Basin: a basin-slope-platform transects
  • FT2 Seismic-scale fluid migration features in a passive margin setting. Outcrop analogues from the Mesozoic SE France Basin
  • FT3 The Bay of Mont Saint Michel: Facies, Morphodynamics and Holocene evolution of a hypertidal coastal environment
  • FT4 Estuarine, coastal marine facies and geobodies architecture in the Gironde estuary and the Atlantic coast (SW France)
  • FT5 Foreland basin evolution in the Southern Pyrenees (Aragon, Spain)
  • FT6 Depositional controls on Marine Source rocks: impact in Conventional and Unconventional Petroleum Systems (Lower Jurassic of the Cantabrian Region, North Spain)
  • FT7 Geological walk in Toulouse

 

  • FT1 The Eocene marine sedimentation in the Southern Pyrenean Basin: a basin-slope-platform transect

Leaders. Roi Da SILVA-CASAL (University of Zaragoza, ESP), Aitor PAYROS (University of the Basque Country, ESP), Naroa MARTÍNEZ-BRACERA (University of the Basque Country, ESP), Marcos Aurell (University of Zaragoza, ESP) mailto

Duration. 3 days (Oct. 7th-9th)

Number of participants. min 20, max 30

Cost. 445€ (double room) & 520€ (single room) including transportation, accommodation, breakfast, field lunches and dinners

Departure. Plaza Federico Moyua 7, 48009 Bilbao (at the bus stop in front of the Deutsche Bank office), Saturday October 7th, at 8:30 a.m.

Return. Congress Center Pierre Baudis (Toulouse), Monday October 9th, at 07:00 p.m.

Transportation. Bus

Description. This field trip will allow a close examination of the sedimentary facies and architecture of the depositional systems developed from deep-sea basin to carbonate slope and shallow-water platform of the Southern Pyrenean basin in Eocene times. In addition, the progressively changing role of several controlling factors, such as climate and tectonism, will be analyzed. The first day will be dedicated to basinal deposits exposed in coastal cliffs near Bilbao (western Pyrenees). The >2300-m-thick lower/middle Eocene succession is mainly composed of hemipelagic carbonate deposits and siliciclastic turbidites. Deep-marine sedimentation was generally controlled by climate, as shown by the accumulation of submarine fan turbidites in cool conditions, the dominance of hemipelagic sedimentation in warmer conditions, and the peculiar characteristics of the deposits accumulated during the EECO (Early Eocene Climatic Optimum). Astronomically driven, short-term climate change (Milankovitch cycles) determined the characteristics of both the hemipelagic deposits and the distal submarine fan turbidites. The early-middle Eocene times were punctuated by several short-lived episodes of extreme global warming (i.e., the so-called hyperthermal events, such as the PETM, Paleocene-Eocene Thermal Maximum), the depositional features of some of which will also be analyzed. In addition, the GSSP (Global Stratotype Section and Point) for the base of the Lutetian Stage (middle Eocene) will be visited and its chronostratigraphic relevance discussed. The second day will begin in the Otsakar section near Pamplona (western Pyrenees). The lower/middle Eocene carbonate slope succession is composed of hemipelagic limestone/marl alternations and calciclastic turbidites (Anotz Fm), which accumulated in one of the few carbonate submarine fans described so far in geological literature. Interestingly, the succession can be readily correlated with the basinal section both at large-scale and bed-to-bed scale. Subsequently, we will move to the shallow-water Guara Fm exposed in the La Peña reservoir and Murillo de Gállego (Zaragoza province, central Pyrenees). Middle-upper Eocene (Lutetian-Bartonian) carbonate platforms are superbly exposed in the Sierras Exteriores area (i.e., the Guara and Arguis formations). The outcrops of the Guara Formation allow understanding the distribution of key skeletal grains across the different facies belts giving rise the Lutetian carbonate platform. The third day will be focused on the Bartonian deltaic system, the associated carbonate buildups, and carbonate ramp deposits. The Lutetian carbonate platform (Guara Fm) was drowned at the onset of the Bartonian, involving the widespread sedimentation of outer platform and prodelta marls (Arguis Formation), laterally related to a delta front (Belsue – Atarés Fm) and fluviatile facies (Campodarbe group) towards de east, on a broader deltaic system. Marly sedimentation was punctuated by the episodic shallow carbonate platform progradation during stages of tectonic quiescence, including a last stage with development of mesophotic coral buildups in a prodelta setting. We will visit those mesophotic buildups near the localitiy of Rasal, as well as a bryozoan-dominated middle ramp deposits. The fieldtrip will conclude with a panoramic overview of the whole system from Pico del Águila.

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  • FT2 Seismic-scale fluid migration features in a passive margin setting. Outcrop analogues from the Mesozoic SE France Basin

Leaders. Jean-Philippe BLOUET (University of Fribourg, CHE), Patrice IMBERT (TOTAL, FRA), Sutieng HO (National Taiwan University, TWN) mailto

Duration. 3 days (Oct. 7th-9th)

Number of participants. min 12, max 32

Cost. 540€ up to 23 participants & 420€ above 23 participants, all inclusive

Departure. Congress Center Pierre Baudis (Toulouse), Saturday October 7th, at 07:00 a.m.

Return. Congress Center Pierre Baudis (Toulouse), Monday October 9th, at 09:00 p.m.

Transportation. Bus

Accommodation. Hôtel-Restaurant Les Jeunes Chefs, Saillans (Drôme, France), Hôtel-Restaurant Le Grand Hôtel du Cours, Sisteron (Alpes de Haute-Provence, France)

Description. The SE France Basin is filled by an up to 10 km-thick pile of Mesozoic sediments. These accumulated in a deep embayment that opened onto the divergent, then drifting northern margin of the Tethys Ocean. Several organic-rich intervals were deposited during that period and have locally reached maturity as biogenic or thermogenic (for both oil and gas) source rocks as evidenced by hydrocarbon shows at the outcrop and in boreholes. Although fluid migration study is usually based on petrographic and geochemistry methods, we will develop during this field trip the concept of outcrop scale fluid migration features, namely: sand injectites and seep carbonates and to some extent mass-transport deposits. We will discuss for each of these the related fluid pressure regime, its links to the petroleum systems and inferred seismic analogues of such bodies based on examples from various sedimentary basins.

We propose a journey across the basin, starting from the NW margin (Vercors) and ending at the foot of the SE margin (Sisteron), visiting Jurassic and Cretaceous outcrops on the way. The first set of outcrops is located in the Diois area. Late Cretaceous seep carbonates are nicely exposed on a ca. 200 m long, 150 m height bluff, which allows the description of mappable clustering pattern. The stacked clusters point down to underlying turbidite channels as possible migration pathways (the related source rock will be observed later in the center of the basin). A second outcrop in that area exposes one of the famous Pseudobioherms of the Terres Noires Formation. This spectacular carbonate mound (20 m thick) differs in several ways from the classic outcrop of Beauvoisin (and other seep carbonates worldwide); the origin of such particularities will be discussed based on facies and petrographic analysis, and linked to hydrocarbon migration mechanisms.

A stop in the center of the basin will allow the participants to examine an 80-m-thick mass-transport deposit (MTD); MTDs are known from geotechnical modeling to detach on intervals of high fluid pressure, making them fluid indicators in a wide sense. In addition, the outcrop will raise the issue of the significance of kinematic indicators and highlight some aspects of the mechanical behavior of sediments shortly after deposition.

Aptian-Albian sand injectites connected with thick sandbodies and cross-cutting the marly Marnes Bleues Fm. will be observed near Sisteron; their association with dispersed columnar and tubular carbonate concretions will be examined based on geometric relationships from a couple of hundred meters to a few kilometers scales.

All along the trip, outcrop examples will be discussed along with seismic sections from various sedimentary basins, in relation with their respective fluid / pressure /petroleum systems.

Further information. The trip area is away from it all in many respects, accommodation will be provided in traditional, family-run hotels and restaurants. The highlights include a museum of regional fossils showing world-class specimens. A short presentation can be found here.

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  • FT3 The Bay of Mont Saint Michel. Facies, Morphodynamics and Holocene evolution of a hypertidal coastal environment

Leaders. Bernadette TESSIER (UMR M2C CNRS-University of Caen Normandie, FRA), Pierre WEILL (UMR M2C CNRS-University of Caen Normandie, FRA), Jérôme FOURNIER (MNHN Concarneau, FRA), Bruno CALINE (TOTAL, FRA), Isabelle BILLEAUD (TOTAL, FRA) mailto

Duration. 2 days (October, 8th-9th)

Number of participants. min 10, max 20

Cost. 300€, including transportation during the field trip (from Rennes to Rennes), accommodation, breakfast, field lunches (2) and dinner (1), guide-book

Departure. Rennes Train Station, Sunday October 8th, at 8:00 a.m. (There are direct flights from Toulouse to Rennes, or direct trains -TGV- from Paris. Participants are advised to arrive in Rennes the day before)

Return. Rennes Airport; Monday October 9th, at 6:00 p.m. (There are direct flights from Rennes to Toulouse – last flight on monday 6:50 p.m.)

Transportation. Bus

Description. The Bay of Mont-Saint-Michel, located between Normandy and Brittany (NW France) is known all over the world through its highly touristic Mont-Saint-Michel and its tidal range, up to 15 m. The aim of this 2-days field trip is to examine the different sedimentary environments, which compose this hypertidal coastal system (in the west, a tide-dominated wave-influenced embayment characterized by wide tidal flats, and bioclastic ridges; In the east, a tide-dominated estuary, with typical tidal facies, especially tidal rhythmites; In the NE, a wave-dominated shoreline with sandspits bordering the high energy estuarine tidal channels. A spectacular reef made by worms develops on the rocky substrate outcropping in this northern entrance of the Bay). Hydrodynamics, sedimentary facies and sequences, Holocene infill and evolution will be discussed through field observations, core, VHR seismic and GPR data. The field trip includes a sightseeing tour of Mont Saint-Michel, and an overview of Norman gastronomy!

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  • FT4 Estuarine, coastal marine facies and geobodies architecture in the Gironde estuary and the Atlantic coast (SW France)

Leaders. Hugues FÉNIÈS (Ensegid-Bordeaux INP, FRA), Raphaël BOURILLOT (Ensegid-Bordeaux INP, FRA), Maxime VIROLLE (University Paris Saclay, FRA) mailto

Duration. 2 days (Oct. 7th-8th)

Number of participants. max 9

Cost. €420, including transportation, field guide, 1 hotel night with breakfast (Oct. 7th), 2 field lunches (Oct. 7th-8th), 1 dinner in a restaurant downtown Bordeaux (Oct. 7th), 1 wine tasting session at Château Tayac. Transportation to Gradignan and return from Gradignan to Toulouse are not included in the price; nor than any additional dinners and hotel nights.

Departure. At the reception desk of the hotel Le Châlet Lyrique, on Saturday, October 7th, at 12:00 a.m. (Possible free pick up of the participants at the airport or the railway station, on the morning of Oct. 7th, before 11:30 a.m. on request)

Return. at the hotel Le Châlet Lyrique, on Sunday October 8th, at 6:00 p.m. (Possible free transfer of the participants to the airport or railway station, on the evening of Sunday Oct. 8th, after 6:00 p.m. on request)

Transportation. Bus & boat

Accommodation. 3-stars Hôtel Le Châlet Lyrique (Gradignan village, located near Bordeaux city, France)

Description. On the first day, the field trip will visit the Gironde estuary, a worldwide reference model for tide-dominated estuaries and will focus on heterolithic estuarine point bars and tidal bars, deposited within the turbidity maximum zone (TMZ). Participants will be transferred by boat on the Plassac tidal bar and detailed facies analysis will be performed based on field observations and trenches. The reservoir heterogeneity of heterolithic point bars and tidal bars will be presented, thanks to numerous cores and very high resolution seismic lines. In addition, the petrology of these estuarine facies will also be presented through thin sections and SEM–EDS data, with a special focus on the clay mineral aggregates coating the quartz grains.

On the second day, the field trip will visit the Atlantic wave-dominated coast and will focus on the facies, reservoir heterogeneity and geometry of the beach and shoreface deposits, thanks to large-size shoreface cores preserved in epoxy. The sequence stratigraphic model of the Gironde incised valley will also be presented through to very high resolution seismic lines.

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  • FT5 Foreland basin evolution in the Southern Pyrenees (Aragon, Spain)

Leaders. Antonio TEIXELL (Universitat Autònoma of Barcelona, ESP), Antonio BARNOLAS (Independent Consultant, Madrid, ESP), Pierre LABAUME (University of Montpellier 2, FRA), Marta ROIGÉ (Universitat Autònoma of Barcelona, ESP) mailto

Duration. 4 days (Oct. 6th-9th)

Number of participants. min 12, max 24

Cost. 780€, including transportation, accommodation, breakfast, field lunches and dinners

Departure. Congress Center Pierre Baudis (Toulouse), Friday October 6th, at 02:00 p.m.

Return. Congress Center Pierre Baudis (Toulouse), Monday October 9th, at 08:30 p.m.

Transportation. Bus

Description. The Jaca basin in the Spanish Pyrenees provides models for syn-orogenic sedimentation in a foreland basin in relation with thrust tectonics. During the field trip we will examine illustrative outcrops of thrusts and fault-related folds, stratal architectures and facies of depositional systems affected by growing structures, which are good analogues for hydrocarbon reservoirs. The trip will cover a traverse of the Jaca basin, where sedimentary rocks and structures and are well exposed and are suitable for conceptual discussion. Syn-orogenic sediments range from deep-water turbidites to shallow marine and terrestrial molasse. Turbidites include debris sheets (megaturbidites) that have produced gas. Molasse sediments are perturbed by growth anticlines and exhibit intraformational unconformities.

The first day comprises the travel from Toulouse to Jaca and a general presentation to the trip after the arrival. In the next day, the field work is initiated in the scenic Aragüés valley, studying thrust-fold geometries and deformed syn-orogenic turbidites. The classic turbidite and breccia deposits of the Hecho group of the Jaca basin, which produced gas, will be analyzed. The third day will be devoted to examine the evolution from deltaic to alluvial systems of the final molassic infill of the basin. In the afternoon we will study growth strata and related unconformities at the internationally known example of the Pico del Aguila anticline. The last day involves a reconnaissance of the interactions between growing salt-related thrust structures and proximal alluvial fan conglomerates in south Pyrenean mountain front at Riglos (Gallego gorge), and concludes with the return in the evening.

Further information. The field trip takes place in mountain scenery, which is a plus to the geology. Lodging will be in a comfortable hotel in the touristic/historic town of Jaca, a famous center for winter and summer leisure activities. Field work involves some walking in mountain terrain, always along safe and well-marked trails. In addition to warm clothes and a raincoat, we recommend hiking boots, sun protection cream, and a hat. Weather can be highly variable in October, and it can determine the order of the stops and the accessibility of some of them.

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  • FT6 Depositional controls on Marine Source rocks: impact in Conventional and Unconventional Petroleum Systems (Lower Jurassic of the Cantabrian Region, North Spain)

Leader. Santiago QUESADA (REPSOL, ESP) mailto

Duration. 2.5 days (Oct. 7th-9th)

Number of participants. min 15, max 21

Cost. 690€ (double room) & 810€ (single room), including transportation, accommodation, breakfast, field lunches and dinners (a limited number of individual rooms are available with an extra of 100€)

Departure. Bilbao airport, Friday October 6th, at 05:30 p.m.

Return. Congress Center Pierre Baudis (Toulouse), Monday October 9th, afternoon

Transportation. Bus

Description. The field trip provides with good field examples, subsurface data and numerous analytical results for an updated review of the depositional controls and models for marine organic facies and source rocks at a basin scale. In addition, the field trip runs in active areas for hydrocarbon exploration and production. The implications for conventional and unconventional petroleum system and hydrocarbon exploration will be discussed.

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  • FT7 Geological walk in Toulouse

Leaders. Frédéric CHRISTOPHOUL (University of Toulouse III - GET, FRA), Stéphane BONNET (University of Toulouse III - GET, FRA), Michel de SAINT BLANQUAT (CNRS - GET, FRA), Vincent Regard (University of Toulouse III - GET, FRA) mailto

Duration. 3-4h. (Oct. 9th)

Number of participants. min 1, max 60 (groups of 15)

Cost. 12€, including field guide

Departure. Starting point at Capitole Place (Toulouse), Monday October 9th, at 01:30 p.m. (group 1), at 01:45 p.m. (group 2), at 02:00 p.m. (group 3), at 02:15 p.m. (group 4)

Description. The city of Toulouse owns an impressive built heritage due to its long history since the roman times, through middle age, modern period until nowadays. This walk in the streets of Toulouse will present the iconic monuments in their historic context through the geological materials used for their building, approaching the local geological context, material availability and constraints. The end of the walk, along the Garonne river docks will allow to present of the geomorphological context of the river terraces and their consequences on the control of historical extreme floods.

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