World-class training for the modern energy industry

Reservoir Characterization of Deepwater Systems: Ross Formation, Ireland (G023)

  • TypeType: Field
  • TypeDiscipline: Depositional Systems, Reservoir Characterization
  • TypeDuration: 5 Days

Tutor(s)

Vitor Abreu: President, ACT-GEO; Adjunct Professor, Rice University, Texas

Overview

Given the high cost of exploration and development of deepwater reservoirs, it is essential to have an accurate pre-drill prediction of reservoir architecture and properties, and to integrate post-drill assessments of reservoir heterogeneity away from well penetrations. The outcrops of the Ross Formation offer a unique opportunity to observe seismic-scale exposures of a deepwater fan system with characteristics similar to the producing fields in West Africa, Brazil and the Gulf of Mexico, to name a few. The size and quality of the exposures allow the participants to observe the main building blocks of fan systems. Lobes and distributary channels can be observed from proximal to distal settings, with excellent exposures of vertical stacking and 2-D arrangements of these elements.

Duration and Logistics

A 5-day field course comprising a mix of field activities with exercises (60%) and classroom lectures with exercises (40%). Exercises emphasize practical applications and will focus on description of deepwater lithofacies, stratal geometries and recognizing key stratigraphic surfaces. The course is based in Kilkee Bay, Ireland, with participants flying in and out of Shannon, Ireland.

Level and Audience

Advanced. This course is intended for geoscientists, petrophysicists, engineers and managers who are seeking to gain a comprehensive understanding of deepwater reservoirs.

Exertion Level

This class requires an EASY exertion level. Access to the coastal outcrops is relatively easy and there will be walks of up to 2km (1.2 miles) most days, all at sea level. The longest walk on the class is approximately 3.2km (2 miles), with no ascent or descent over 50m (160 feet). Summer weather can be cool and wet, or warm and wet, with a daily temperature range of 4–24°C (40–74°F). Transport will be by van on paved roads.

Objectives

You will learn to:

  1. Interpret and map different archetypes of deepwater reservoirs using cores, well-logs and seismic lines, from exploration to production business scales.
  2. Define trap configurations and perform risk assessment for stratigraphic traps.
  3. Estimate reservoir presence risk and predict N:G.
  4. Interpret environments of deposition (EoDs) and related reservoir architecture, lithofacies associations and diversity.
  5. Evaluate reservoir geometry and connectivity in different EoDs, integrating with production data.
  6. Define depositional geometries of turbidites in seismic-scale outcrops.

Course Content

IIn addition to visiting world-class outcrops, participants will learn to describe cores and integrate core and well-log information with seismic to generate high-resolution environment of deposition maps of reservoirs in different settings. Additionally, participants will learn how to integrate engineering and production data to improve prediction of reservoir performance. Cores, well-logs and seismic examples are compared to and contrasted with outcrops to help participants extrapolate 2-D outcrop information to 3-D views of reservoir scale depositional systems.

Itinerary (Provisional)

Day 0
Participants arrive at Shannon Airport and travel to Kilkee Bay.

Day 1
Field visit: George’s Point

  • George’s Point, east side of Kilkee Bay, to introduce the local stratigraphy and setting
  • Lectures: Class introduction, field safety and geologic setting; and sequence stratigraphy of deepwater systems
  • Exercises: Lowstand sequence sets from Pelotas Basin, West Siberia and New Jersey

Day 2
Field visit: Loop Head and Fisherman’s Point

  • Loop Head; general basinal context; Ross Formation turbidites. Bridges of Ross and east of Ross; major slump sheets, Fisherman’s Point turbidite channels and sand volcanoes
  • Lectures: Deepwater processes and depositional models
  • Exercises: Lobes and lobe complexes – Golo Fan

Day 3
Field visits: Ross Formation at Kilcredaun, Carrigaholt and Loop Head

  • Ross Formation at Kilcredaun; boat trip from Carrigaholt; Ross Formation in sea cliffs between Carrigaholt and Loop Head; lateral accretion packages of the Rehy Cliffs
  • Lectures: Deepwater lithofacies and rock properties
  • Exercises: Core description of deepwater reservoirs

Day 4
Field visits: Kilbaha Bay, Kilcloher Head and Rinevella Bay

  • Turbidite facies including channels and mega-flutes
  • Lectures: Deepwater exploration methods, reservoir presence assessment and pre-drill prediction
  • Exercises: East breaks mini-basin mapping and pre-drill prediction

Day 5
Field visit: Torkeal Bay

  • Torkeal Bay – stories, story stacking, lobe and lobe stacking
  • Lectures: Deepwater reservoirs and production behavior
  • Exercises: High-resolution reservoir mapping and production data integration

Day 6
Drive to Shannon and depart.

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