2024 – Field Trip 1

Field Trip 1

Pre-Salt Reservoir Analogues: Lagoon and Subaerial Carbonate Deposits Analysis and
Petrophysical Quality Impacts to Alagoas Age Carbonate Deposits – Campos and Santos Basin

 Date: Saturday, May 18, 2024
Time: 7:30 a.m. – 6:30 p.m.
Fee: $250 for registered attendees.
Maximum capacity: 30 people
Location: Itaboraí e Araruama, Rio de Janeiro, Brazil
Included: Transportation, picnic/lunch, field guide. Pick-up and return from Sheraton Grand Hotel
Sponsor: Petrobras

FIELD TRIP LEADERS: Candida Menezes, Petrophysicist; Ednilson Freire, Reservoir Geologist Advisor; Humberto Calfa, Exploration Geologist; Julia Guerrero, Reservoir Geologist; Marcelle Erthal, Sedimentologist R&D; Paulo Moretti, Sedimentologist Advisor; Willy Bohn, Petrophysicist.

DISCIPLINE: Sedimentology, Stratigraphy, Petrophysics

MAIN GOALS: The one-day field trip aims to provide a better understanding of carbonate sedimentation produced by various biotic or abiotic agents, through the study of an ancient travertine deposits and a recent lagoon in the stunning Lakes Region of Rio de Janeiro State. Furthermore, a discussion on the analogy between the observed sedimentary deposits and the main carbonate Pre-salt reservoirs of the Barra Velha Formation (Alagoas age) will be promoted during the field trip. The approach will comprise sedimentological, stratigraphic and petrophysical aspects.

THE FIELD TRIP: The discovery of large oil accumulations in the Pre-Salt of both Campos and Santos Basins raised the interest in the understanding of lacustrine carbonate sedimentation. The oil production from the pre-salt lacustrine carbonate reservoirs (Alagoas age) currently corresponds to seventy-eight percent of total Brazilian production. This proposed field trip will allow the analysis of sedimentological (generation) and stratigraphic (preservation) aspects to the main carbonate reservoirs observed in the Pre-Salt. In the Araruama region, located north of Rio de Janeiro city, recent organic and chemical sedimentary structures (stromatolites and microbial mats) will be observed and typical carbonate reworking structures. This observation will allow discussions about the base level controls on the formation and preservation of these structures, as well as the physical, chemical and climatic controls for formation and areal distribution. In the Itaboraí region, preserved ancient travertine and tufa deposits will be analyzed, where it will be possible the facies study, geometries and lateral variations of these deposits, also present in the Pre-Salt reservoirs in the East Brazilian Margin. Finally, a conclusion will be made with discussions about the petrophysical and geochemical characteristics from the point of view of the analyzes carried out along the outcrops visited and of the aspects observed in the reservoirs found in the Pre-Salt – Alagoas Age.

 TRIP ITINERARY:

RECOMMENDATIONS: It is recommended to wear a hat or cap, light clothing, sunscreen, nautic aqua shoes (neoprene), extra slippers.

THE FIELD TRIP LEADERS: The field trip leaders are composed by specialist and advisor geologists from Petrobras that has extensive experience in sedimentology, stratigraphy, reservoir geology and petrophysics of carbonate rocks and Pre-Salt reservoirs. The group has worked with rock samples analysis, petrography, log interpretation, sedimentological e diagenetic modeling, stratigraphic correlation, and field activities.