5 days RES/CARBFT
- Geologists, geophysicists, petrophysicists and reservoir engineers.
- Fundamentals of carbonate sedimentology may be a useful prerequisite, but a quick reminder can be organized in the field.
- The Jurassic outcrops of Eastern Paris Basin are exceptional quality analogues for several producing oil fields, especially regarding sequence stratigraphy features and typical carbonate platforms architecture. Recent diagenetic and petrophysical investigation performed on selected outcrops and in equivalent subsurface provide a unique opportunity of proposing an updated, complete and integrated overview of shallow marine carbonates.
- Upon completion of the course, participants will be able to:
- review the constraints to the static model in the field,
- integrate outcrop observation with subsurface data: sedimentary architectures,
- show the distribution and evolution of petrophysical properties through diagenesis.
- A geological and petrophysical static model was performed over a large area centered on the main zone of interest, along an extended stratigraphic interval (Bajocian to Kimmeridgian).
- No prerequisites for this course.
Ways and means
- Outcrop sections (quarries), cores, well logs, thin section photographs, RCA data, NMR logs.
- AM: Meeting point on field trip location.
- PM: Presentation of the stratigraphic succession and of the aims of the trip.
- Early Bajocian platform: 1 quarry (out of 2 possible) with illustration of coral bioconstructions, and inter-bioherms sedimentation. Integration with 3D seismic observations. Quick reminder on basics of carbonate sedimentology on site if required.
- AM: Late Bajocian flooding (flooding of the Early Bajocian carbonate platform) and subsequent establishment of Bathonian platform; discussion about forcing parameters on carbonate platform growths and demises. One type section in a quarry.
- PM: Bathonian platform outcrops (3) in distal (offshore), shoal (OOID shoal) and proximal environments; introduction to the local petrophysics (porosity, permeability, NMR, MICP, …) and reservoir problematic. First integration and discussion of the 3D geological and reservoir model (input, controls on facies and poro-perm distribution in the Middle Jurassic carbonates).
- Visit of the Andra Underground Research Laboratory (to be confirmed) + core store with examples of subsurface equivalent of what has been and will be observed on outcrops AND/OR outcrops illustrating the return of carbonate sedimentation after the Callovian-Oxfordian marls, and the establishment of the Oxfordian platform; discussion about forcing parameters on carbonate platform growths and demises.
- Visit of quarries (2 or 3) to illustrate the evolution of the Oxfordian/Kimmeridgian platform evolution; discussion about the evolution of the architecture of the platform, and regarding the distribution of depositional environments distribution.
- Introduction to the local petrophysics (porosity, permeability, NMR, MICP, …) and reservoir problematic. Second integration and discussion of the 3D geological and reservoir model (input, controls on facies and poro-perm distribution in the Upper Jurassic carbonates).
- AM: Optional quarry AND/OR local gastronomy specialties.
- PM: Travel back to Paris.