Deciphering Diffuse Fractures from Damage Fractures in Fault Zones and Their Effect on Reservoir Properties in Urgonian Carbonates

2018 ◽  
Author(s):  
I. Aubert ◽  
J. Lamarche ◽  
P. Leonide ◽  
N. Semmani ◽  
R. Bourezak ◽  
...  
Keyword(s):  
Fault Zones ◽  
Reservoir Properties

scholarly journals Diagenetic evolution of fault zones in Urgonian microporous carbonates, impact on reservoir properties (Provence – southeast France)

Solid Earth ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 1163-1186
Author(s):  
Irène Aubert ◽  
Philippe Léonide ◽  
Juliette Lamarche ◽  
Roland Salardon
Keyword(s):  
Polarized Light ◽  
Fault Zones ◽  
Reservoir Properties ◽  
Thin Sections ◽  
Stable Isotopic ◽  
Calcite Cementation ◽  
Diagenetic Evolution ◽  
The Impact ◽  
Isotopic Measurements ◽  
Δ13c And Δ18o

Abstract. Microporous carbonate rocks form important reservoirs with permeability variability depending on sedimentary, structural, and diagenetic factors. Carbonates are very sensitive to fluid–rock interactions that lead to secondary diagenetic processes like cementation and dissolution capable of modifying the reservoir properties. Focusing on fault-related diagenesis, the aim of this study is to identify the impact of the fault zone on reservoir quality. This contribution focuses on two fault zones east of La Fare anticline (SE France) crosscutting Urgonian microporous carbonates. Overall, 122 collected samples along four transects orthogonal to fault strike were analyzed. Porosity values have been measured on 92 dry plugs. Diagenetic elements were determined through the observation of 92 thin sections using polarized light microscopy, cathodoluminescence, carbonate staining, SEM, and stable isotopic measurements (δ13C and δ18O). Eight different calcite cementation stages and two micrite micro-fabrics were identified. As a main result, this study highlights that the two fault zones acted as drains canalizing low-temperature fluids at their onset and induced calcite cementation, which strongly altered and modified the local reservoir properties.

scholarly journals Diagenetic evolution of fault zones in Urgonian microporous carbonates, impact on reservoir properties (Provence – SE France)

2019 ◽  
Author(s):  
Irène Aubert ◽  
Philippe Leonide ◽  
Juliette Lamarche ◽  
Roland Salardon
Keyword(s):  
Fault Zone ◽  
Polarized Light ◽  
Fluid Flows ◽  
Fault Zones ◽  
Reservoir Properties ◽  
Thin Sections ◽  
Calcite Cement ◽  
Diagenetic Evolution ◽  
Isotopic Measurements ◽  
Se France

Abstract. Microporous carbonate rocks form important reservoirs with high a permeability variability depending of sedimentary, structural and diagenetic factors. Carbonates are very sensitive to fluids-rock interactions that trigger to secondary processes like cementation and dissolution leading to reservoir properties modifications. As they can act as drains or barriers, fault zones influence the fluid flows in the upper part of Earth crust and increase the fluid-rock interactions. The aim of this study is to identify fault zone impact on fluid flows and reservoir properties during basin geodynamic history. The study focuses on 2 fault zones of the Eastern part of La Fare Anticlinal (SE France) where Urgonian microporous carbonates underwent polyphase tectonics and diagenesis. We took 122 samples along 4 transects cross-cutting two fault zones. Porosity values have been measured on 92 dry plugs. Diagenetic properties of samples have been determined on 92 thin sections using Polarized Light Microscopy, cathodoluminescence, red alizarin, SEM and isotopic measurements (δ13C and δ18O). Height calcite cement stages and 2 micrite micro-fabrics have been identified. This study highlight that fault zones acted as drain canalizing low temperature fluids at their onset, and induced fault zone cementation with two cementation phases, what has strongly altered and modified local reservoir properties.

The permeability structure of fault zones in sedimentary basins: a case study at the Castle Cove Fault, Otway Basin

2018 ◽  
Vol 58 (2) ◽  
pp. 805
Author(s):  
Natalie Debenham ◽  
Natalie J. C. Farrell ◽  
Simon P. Holford ◽  
Rosalind C. King ◽  
David Healy
Keyword(s):  
Fault Plane ◽  
Hanging Wall ◽  
Sedimentary Basins ◽  
Progressive Increase ◽  
Fault Zones ◽  
High Porosity ◽  
Reservoir Properties ◽  
Petroleum Systems ◽  
Host Rocks ◽  
Permeability Structure

An understanding of the permeability structure and transmissibility of fault zones can have profound implications for reservoir appraisal and development within petroleum systems. Previous investigations on the permeability structure of fault zones often focus on low-porosity host rocks rather than porous sedimentary rocks which more commonly form reservoirs. We present detailed mineralogical and geomechanical data from porous Cretaceous sandstones (Eumeralla Formation) collected at the Castle Cove Fault in the Otway Basin, south-east Australia. Ten orientated sample blocks were collected in the hanging wall at distances within 0.5–225 m from the fault plane. A progressive increase in porosity (~17–24%), permeability (0.04–2.92 mD), and pore throat size and connectivity was observed as the fault plane was approached. High-resolution thin section analyses revealed an increase in grain-scale fractures and deformation of authigenic clays in sandstones adjacent to the Castle Cove Fault plane. The improvement of the permeability structure of the sandstones is attributed to the formation of grain-scale fractures and the change in clay morphology as a result of faulting. This study demonstrates the importance of detailed mineralogical and geomechanical analyses when attempting to understand the reservoir properties of high porosity, low permeability, and clay-rich sandstones.

COMPOSITION AND RESERVOIR PROPERTIES OF DEPOSITS OF THE BAZHENOV FORMATION IN THE CENTRAL PART OF TUNDRIN DEPRESSION

2018 ◽  
pp. 107-111
Author(s):  
O. M. Makarova ◽  
N. I. Korobova ◽  
A. G. Kalmykov ◽  
G. A. Kalmykov
Keyword(s):  
Reservoir Properties ◽  
Bazhenov Formation ◽  
The Core ◽  
Petrophysical Data ◽  
Pore Types

According to lithological and petrophysical data the core of the Bazhenov Formation, discovered in the central part of the Tundrin Basin, the structure of the section was characterized , productive oil intervals were identified, in which the collectors of pore and fissure-pore types are developed.

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

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