Basement heat flow, past or present, is a key input parameter in geothermal or hydrocarbon matura... more Basement heat flow, past or present, is a key input parameter in geothermal or hydrocarbon maturation models but the scarcity of available reliable heat flow estimates is usually impeding basin or regional scale interpretation (Fig.1). This study proposes a GIS-based geologically-driven alternative workflow to the direct interpolation of heat flow data points to determine first pass regional variation of basement heat flow using publicly available datasets.
HAL (Le Centre pour la Communication Scientifique Directe), May 14, 2007
Je voudrais tout d'abord remercier l'ensemble des membres du jury, Jean-Pierre Petit, Yves Leroy,... more Je voudrais tout d'abord remercier l'ensemble des membres du jury, Jean-Pierre Petit, Yves Leroy, Atef Onaisi, Najwa Yassir, Jacques Angelier, Stéphane Bouissou et Loic Bazalgette pour avoir accepté de juger ce travail. Au terme de ce travail je tiensà remercier A. Chemenda pour avoir diriger cette thèse et su canaliser mes efforts de recherche sur les aspects les plus prometteurs de cette recherche. Mes remerciements vont aussià tous les membres de Geo-FracNet, passés et actuels :
... orogeny. In the Uralides, there is a linear HP belt west of the main ophiolitic suture. The H... more ... orogeny. In the Uralides, there is a linear HP belt west of the main ophiolitic suture. The HP metamorphism (15-18 kbar/500-700°C) developed in supracrustal continental rocks outcropping beneath an ophiolitic nappe. This ...
Digital Earth Africa is now providing an operational Sentinel-1 normalized radar backscatter data... more Digital Earth Africa is now providing an operational Sentinel-1 normalized radar backscatter dataset for Africa. This is the first free and open continental scale analysis ready data of this kind that has been developed to be compliant with the CEOS Analysis Ready Data for Land (CARD4L) specification for normalized radar backscatter (NRB) products. Partnership with Sinergise, a European geospatial company and Earth observation data provider, has ensured this dataset is produced efficiently in the cloud infrastructure and can be sustained in the long term. The workflow applies radiometric terrain correction (RTC) to the Sentinel-1 ground range detected (GRD) product, using the Copernicus 30 m digital elevation model (DEM). The method is used to generate data for a range of sites around the world and has been validated as producing good results. This dataset over Africa is made available publicly as a AWS public dataset and can be accessed through the Digital Earth Africa platform and...
The McArthur Basin SEEBASE model for basement topography provides a new view of basin geometry an... more The McArthur Basin SEEBASE model for basement topography provides a new view of basin geometry and a foundation upon which to build basin, petroleum systems, and play models. This project has integrated readily available open-file datasets to provide an interpretation of the structure and geometry of the numerous sub-basins at a regional-scale (ca 1:1M). It forms an exploration template and provides a context which can be used to better constrain known petroleum and mineral systems and to generate new play concepts. The greater McArthur Basin GIS and SEEBASE study is a cost-effective prospecting tool that gives a first-pass regional perspective, providing a basis for focusing future exploration and data acquisition strategies, and reducing exploration risk
The 2018 North West Queensland SEEBASE provides a significantly higher resolution interpretation ... more The 2018 North West Queensland SEEBASE provides a significantly higher resolution interpretation of the basement surface. The 2006 OZ SEEBASE version provided a good regional overview and clearly highlighted all of the main depocentres, but it lacked detail due to the regional nature of the study and the availability and quality of data available at the time. The range of new and updated data, and evolution of our understanding of regional geology and tectonic evolution has led to significant improvements in the updated SEEBASE model and significantly improves understanding of basement and basin evolution for North West Queensland. The results provide industry with a framework product to help focus exploration and data acquisition strategies and reduce exploration risk
The Moattama Basin lies in offshore Myanmar bounded to the west by the Yadana-M8 High and to the ... more The Moattama Basin lies in offshore Myanmar bounded to the west by the Yadana-M8 High and to the east by the Tanintharyi - Mergui Shelf. The depocentre continues south as the East Andaman Basin which is bounded to the west by the Alcock-Sewell rises. Together, the two basins are also referred to as the Martaban Basin (e.g. Racey and Ridd, 2015). The main depocentre is dominated by a very thick Late Miocene to Recent delta system, and includes a less well known Late Oligocene-Early Miocene syn-rift. The Tertiary sediments are thickest (>8km; Racy and Ridd, 2015) in the Moattama region and adjacent to the shelf, and thin to ∼5 km in the southern deep water blocks (Fig. 1) where water depth is >∼2,500m. Frogtech Geoscience has completed an integrated study to understand the geodynamic evolution of basement and basin systems of onshore and offshore Myanmar. A key part of this project has been interpretation of the nature of basement, including basement terranes, major boundaries, ...
The 2017 onshore Canning SEEBASE provides a significantly higher resolution interpretation of the... more The 2017 onshore Canning SEEBASE provides a significantly higher resolution interpretation of the basement surface beneath the Canning Basin in comparison to earlier versions. The range of new and updated data, and the evolution of our understanding of the regional geology and tectonic evolution has led to significant improvements in the SEEBASE model and the understanding of basement and basin evolution for the Canning Basin. The results provide GSWA and other researchers with a base for planning further research programs and pre-competitive data acquisition, as well as providing industry with a framework product to help focus exploration and data acquisition strategies and reducing exploration risk.
A recently released open file study of the depth-to-basement and basement heat flow is presented,... more A recently released open file study of the depth-to-basement and basement heat flow is presented, which covers the Queensland portion of the South Nicholson Basin and includes basins underlying the Lawn Hill Platform and Georgina Basin. The present-day basement heat flow model is derived from an analysis of basement composition, structure and history, with the crustal radiogenic and mantle heat flow assessed separately. Resulting from an integrated, iterative interpretation and analysis of a wide range of publicly available spatially continuous geophysical and geological datasets, the heat flow model reproduces faithfully sharp and high-amplitude variations of the published heat flow at small distances. Variations are replicated through the integration of interpreted basement composition and a geologically driven determination of heat production within the radiogenic crustal layer. The values of mantle heat flow based on lithosphere thickness derived from seismic tomography models a...
A new regional scale SEEBASE® model has been produced for the intracratonic Canning Basin, locate... more A new regional scale SEEBASE® model has been produced for the intracratonic Canning Basin, located in the north of Western Australia. The 2017 Canning Basin SEEBASE model is more than an order of magnitude higher resolution than the 2005 OZ SEEBASE version — the average resolution is ~1 : 1 M scale with higher resolution in areas of shallow basement with 2D seismic coverage — such as the Broome Platform and Barbwire Terrace. Post-2005 acquisition of potential field, seismic and well data in the Canning Basin by the Geological Survey of Western Australia (GSWA), Geoscience Australia and industry provided an excellent opportunity to upgrade the SEEBASE depth-to-basement model in 2017. The SEEBASE methodology focuses on a regional understanding of basement, using potential field data to interpret basement terranes, depth-to-basement (SEEBASE), regional structural geology and basement composition. The project involved extensive potential field processing and enhancement and compilation ...
Dilatancy bands were recently obtained in conventional axisymmetric extension tests on a syntheti... more Dilatancy bands were recently obtained in conventional axisymmetric extension tests on a synthetic physical rock analogue (granular, frictional, cohesive and dilatant) material GRAM1 at a relatively low mean stress σ within range σd < σ < σs , where σd and σs are experimentally constrained values (Chemenda et al., JGR, 2011). The walls of the opened bands have plumose morphology defined by the decohesion pattern of the material within the band, which have a complex 3-D structure. At σ < σd , the sample rupture occurs through mode I cracking and results in smooth fracture surfaces. With σ increase at σ > σs , the bands become inclined to σ1 , resulting in dilatant shear and then in compactive shear bands that have an irregular structure and geometry at a micro-scale. Pure compaction bands were not obtained (at least not evidenced) in the extension tests, but they were generated in the GRAM1 compression tests as previously in the porous rocks. At lower pressure in the comp...
Terminology on fracture and discontinuities in geological objects mainly relies on distinguishing... more Terminology on fracture and discontinuities in geological objects mainly relies on distinguishing between tabular and sharp forms of deformation localization/failure structures (Aydin et al, JSG 2006; Shultz and Fossen, AAPG, 2009). On this basis joints (considered as mode I fractures) and dilation bands (very rarely observed) are distinguished among extension discontinuities. The former propagate with the separation of the fracture walls due to strong stress concentration at the fracture tips. The plumose features or hackles typical of joints (these terms cover a wide variety of diverging fractographic features) are believed to result from the fracture front breakdown due to the loading mode change (the origin of this change remains unclear). This view is called into question by recent experimental results of extension tests conducted on a synthetic physical rock analogue (granular, frictional, cohesive and dilatant) material (GRAM1) and by field observations of embryonic (not yet ...
La modélisation de la déformation, de la rupture et de la fracturation des milieux rocheux représ... more La modélisation de la déformation, de la rupture et de la fracturation des milieux rocheux représente un enjeu majeur dans de nombreux domaines scientifiques et pratiques, notamment pour l'exploitation des réservoirs fracturés. Cependant, cette modélisation se heurte à la mauvaise ...
Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synth... more Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synthetic granular, cohesive, frictional and dilatant rock analogue material GRAM2. For the first time parallel sets of fractures that have all the characteristics of natural joints were reproduced in the laboratory. The fractures are regularly spaced, normal to σ 3 , and have plumose morphology very similar to that of natural joints. These fractures can form at tensile stress σ 3 much smaller in magnitude than the tensile strength of material and even at slightly compressive σ 3. When mean stress σ exceeds a certain value, the fractures become oblique to σ 1 (the obliquity increases with σ), forming networks of conjugate shear bands/fractures. These results of plane-strain experiments are in good agreement with those of better controlled conventional axisymmetric tests on a similar material in Chemenda et al. (2011b) and are closer to real geological situations. Both types of experiments are complementary. Their results lead to the conclusion that at least certain categories of natural fractures (including joints, and conjugate shear fractures/bands) were initiated as deformation localization bands. The band orientation is defined by the constitutive properties/parameters (notably the dilatancy factor) that are sensitive to σ.
La modélisation physique thermo-mécanique de la subduction continentale est réalisée grâce à des ... more La modélisation physique thermo-mécanique de la subduction continentale est réalisée grâce à des matériaux analogues très sensibles à la température. Ils permettent de modéliser les différentes couches de la lithosphère, soumise à un gradient thermique. La croûte continentale est ...
Boutelier, D., Chemenda, A. & Jorand, C. 2002. Thermo-mechanical laboratory modelling of continen... more Boutelier, D., Chemenda, A. & Jorand, C. 2002. Thermo-mechanical laboratory modelling of continental subduction: first experiments. In: Schellart , WP and Passchier, C. 2002. Analogue modelling of large-scale tectonic processes. Journal of the Virtual Explorer , 6, 61-65.
In number of orogens (e.g. Alps, Norwegian Caledonides, Dabie Shan) exhumation of UHP/LT rocks wa... more In number of orogens (e.g. Alps, Norwegian Caledonides, Dabie Shan) exhumation of UHP/LT rocks was followed by HT metamorphism and magmatic events both suggesting heating of the crust. We present a geodynamical model based on the thermo-mechanical analogue experiments that allow us to account for this relation between the exhumation and temperature increase. According to the model the continental crust
Basement heat flow, past or present, is a key input parameter in geothermal or hydrocarbon matura... more Basement heat flow, past or present, is a key input parameter in geothermal or hydrocarbon maturation models but the scarcity of available reliable heat flow estimates is usually impeding basin or regional scale interpretation (Fig.1). This study proposes a GIS-based geologically-driven alternative workflow to the direct interpolation of heat flow data points to determine first pass regional variation of basement heat flow using publicly available datasets.
HAL (Le Centre pour la Communication Scientifique Directe), May 14, 2007
Je voudrais tout d'abord remercier l'ensemble des membres du jury, Jean-Pierre Petit, Yves Leroy,... more Je voudrais tout d'abord remercier l'ensemble des membres du jury, Jean-Pierre Petit, Yves Leroy, Atef Onaisi, Najwa Yassir, Jacques Angelier, Stéphane Bouissou et Loic Bazalgette pour avoir accepté de juger ce travail. Au terme de ce travail je tiensà remercier A. Chemenda pour avoir diriger cette thèse et su canaliser mes efforts de recherche sur les aspects les plus prometteurs de cette recherche. Mes remerciements vont aussià tous les membres de Geo-FracNet, passés et actuels :
... orogeny. In the Uralides, there is a linear HP belt west of the main ophiolitic suture. The H... more ... orogeny. In the Uralides, there is a linear HP belt west of the main ophiolitic suture. The HP metamorphism (15-18 kbar/500-700°C) developed in supracrustal continental rocks outcropping beneath an ophiolitic nappe. This ...
Digital Earth Africa is now providing an operational Sentinel-1 normalized radar backscatter data... more Digital Earth Africa is now providing an operational Sentinel-1 normalized radar backscatter dataset for Africa. This is the first free and open continental scale analysis ready data of this kind that has been developed to be compliant with the CEOS Analysis Ready Data for Land (CARD4L) specification for normalized radar backscatter (NRB) products. Partnership with Sinergise, a European geospatial company and Earth observation data provider, has ensured this dataset is produced efficiently in the cloud infrastructure and can be sustained in the long term. The workflow applies radiometric terrain correction (RTC) to the Sentinel-1 ground range detected (GRD) product, using the Copernicus 30 m digital elevation model (DEM). The method is used to generate data for a range of sites around the world and has been validated as producing good results. This dataset over Africa is made available publicly as a AWS public dataset and can be accessed through the Digital Earth Africa platform and...
The McArthur Basin SEEBASE model for basement topography provides a new view of basin geometry an... more The McArthur Basin SEEBASE model for basement topography provides a new view of basin geometry and a foundation upon which to build basin, petroleum systems, and play models. This project has integrated readily available open-file datasets to provide an interpretation of the structure and geometry of the numerous sub-basins at a regional-scale (ca 1:1M). It forms an exploration template and provides a context which can be used to better constrain known petroleum and mineral systems and to generate new play concepts. The greater McArthur Basin GIS and SEEBASE study is a cost-effective prospecting tool that gives a first-pass regional perspective, providing a basis for focusing future exploration and data acquisition strategies, and reducing exploration risk
The 2018 North West Queensland SEEBASE provides a significantly higher resolution interpretation ... more The 2018 North West Queensland SEEBASE provides a significantly higher resolution interpretation of the basement surface. The 2006 OZ SEEBASE version provided a good regional overview and clearly highlighted all of the main depocentres, but it lacked detail due to the regional nature of the study and the availability and quality of data available at the time. The range of new and updated data, and evolution of our understanding of regional geology and tectonic evolution has led to significant improvements in the updated SEEBASE model and significantly improves understanding of basement and basin evolution for North West Queensland. The results provide industry with a framework product to help focus exploration and data acquisition strategies and reduce exploration risk
The Moattama Basin lies in offshore Myanmar bounded to the west by the Yadana-M8 High and to the ... more The Moattama Basin lies in offshore Myanmar bounded to the west by the Yadana-M8 High and to the east by the Tanintharyi - Mergui Shelf. The depocentre continues south as the East Andaman Basin which is bounded to the west by the Alcock-Sewell rises. Together, the two basins are also referred to as the Martaban Basin (e.g. Racey and Ridd, 2015). The main depocentre is dominated by a very thick Late Miocene to Recent delta system, and includes a less well known Late Oligocene-Early Miocene syn-rift. The Tertiary sediments are thickest (>8km; Racy and Ridd, 2015) in the Moattama region and adjacent to the shelf, and thin to ∼5 km in the southern deep water blocks (Fig. 1) where water depth is >∼2,500m. Frogtech Geoscience has completed an integrated study to understand the geodynamic evolution of basement and basin systems of onshore and offshore Myanmar. A key part of this project has been interpretation of the nature of basement, including basement terranes, major boundaries, ...
The 2017 onshore Canning SEEBASE provides a significantly higher resolution interpretation of the... more The 2017 onshore Canning SEEBASE provides a significantly higher resolution interpretation of the basement surface beneath the Canning Basin in comparison to earlier versions. The range of new and updated data, and the evolution of our understanding of the regional geology and tectonic evolution has led to significant improvements in the SEEBASE model and the understanding of basement and basin evolution for the Canning Basin. The results provide GSWA and other researchers with a base for planning further research programs and pre-competitive data acquisition, as well as providing industry with a framework product to help focus exploration and data acquisition strategies and reducing exploration risk.
A recently released open file study of the depth-to-basement and basement heat flow is presented,... more A recently released open file study of the depth-to-basement and basement heat flow is presented, which covers the Queensland portion of the South Nicholson Basin and includes basins underlying the Lawn Hill Platform and Georgina Basin. The present-day basement heat flow model is derived from an analysis of basement composition, structure and history, with the crustal radiogenic and mantle heat flow assessed separately. Resulting from an integrated, iterative interpretation and analysis of a wide range of publicly available spatially continuous geophysical and geological datasets, the heat flow model reproduces faithfully sharp and high-amplitude variations of the published heat flow at small distances. Variations are replicated through the integration of interpreted basement composition and a geologically driven determination of heat production within the radiogenic crustal layer. The values of mantle heat flow based on lithosphere thickness derived from seismic tomography models a...
A new regional scale SEEBASE® model has been produced for the intracratonic Canning Basin, locate... more A new regional scale SEEBASE® model has been produced for the intracratonic Canning Basin, located in the north of Western Australia. The 2017 Canning Basin SEEBASE model is more than an order of magnitude higher resolution than the 2005 OZ SEEBASE version — the average resolution is ~1 : 1 M scale with higher resolution in areas of shallow basement with 2D seismic coverage — such as the Broome Platform and Barbwire Terrace. Post-2005 acquisition of potential field, seismic and well data in the Canning Basin by the Geological Survey of Western Australia (GSWA), Geoscience Australia and industry provided an excellent opportunity to upgrade the SEEBASE depth-to-basement model in 2017. The SEEBASE methodology focuses on a regional understanding of basement, using potential field data to interpret basement terranes, depth-to-basement (SEEBASE), regional structural geology and basement composition. The project involved extensive potential field processing and enhancement and compilation ...
Dilatancy bands were recently obtained in conventional axisymmetric extension tests on a syntheti... more Dilatancy bands were recently obtained in conventional axisymmetric extension tests on a synthetic physical rock analogue (granular, frictional, cohesive and dilatant) material GRAM1 at a relatively low mean stress σ within range σd < σ < σs , where σd and σs are experimentally constrained values (Chemenda et al., JGR, 2011). The walls of the opened bands have plumose morphology defined by the decohesion pattern of the material within the band, which have a complex 3-D structure. At σ < σd , the sample rupture occurs through mode I cracking and results in smooth fracture surfaces. With σ increase at σ > σs , the bands become inclined to σ1 , resulting in dilatant shear and then in compactive shear bands that have an irregular structure and geometry at a micro-scale. Pure compaction bands were not obtained (at least not evidenced) in the extension tests, but they were generated in the GRAM1 compression tests as previously in the porous rocks. At lower pressure in the comp...
Terminology on fracture and discontinuities in geological objects mainly relies on distinguishing... more Terminology on fracture and discontinuities in geological objects mainly relies on distinguishing between tabular and sharp forms of deformation localization/failure structures (Aydin et al, JSG 2006; Shultz and Fossen, AAPG, 2009). On this basis joints (considered as mode I fractures) and dilation bands (very rarely observed) are distinguished among extension discontinuities. The former propagate with the separation of the fracture walls due to strong stress concentration at the fracture tips. The plumose features or hackles typical of joints (these terms cover a wide variety of diverging fractographic features) are believed to result from the fracture front breakdown due to the loading mode change (the origin of this change remains unclear). This view is called into question by recent experimental results of extension tests conducted on a synthetic physical rock analogue (granular, frictional, cohesive and dilatant) material (GRAM1) and by field observations of embryonic (not yet ...
La modélisation de la déformation, de la rupture et de la fracturation des milieux rocheux représ... more La modélisation de la déformation, de la rupture et de la fracturation des milieux rocheux représente un enjeu majeur dans de nombreux domaines scientifiques et pratiques, notamment pour l'exploitation des réservoirs fracturés. Cependant, cette modélisation se heurte à la mauvaise ...
Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synth... more Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synthetic granular, cohesive, frictional and dilatant rock analogue material GRAM2. For the first time parallel sets of fractures that have all the characteristics of natural joints were reproduced in the laboratory. The fractures are regularly spaced, normal to σ 3 , and have plumose morphology very similar to that of natural joints. These fractures can form at tensile stress σ 3 much smaller in magnitude than the tensile strength of material and even at slightly compressive σ 3. When mean stress σ exceeds a certain value, the fractures become oblique to σ 1 (the obliquity increases with σ), forming networks of conjugate shear bands/fractures. These results of plane-strain experiments are in good agreement with those of better controlled conventional axisymmetric tests on a similar material in Chemenda et al. (2011b) and are closer to real geological situations. Both types of experiments are complementary. Their results lead to the conclusion that at least certain categories of natural fractures (including joints, and conjugate shear fractures/bands) were initiated as deformation localization bands. The band orientation is defined by the constitutive properties/parameters (notably the dilatancy factor) that are sensitive to σ.
La modélisation physique thermo-mécanique de la subduction continentale est réalisée grâce à des ... more La modélisation physique thermo-mécanique de la subduction continentale est réalisée grâce à des matériaux analogues très sensibles à la température. Ils permettent de modéliser les différentes couches de la lithosphère, soumise à un gradient thermique. La croûte continentale est ...
Boutelier, D., Chemenda, A. & Jorand, C. 2002. Thermo-mechanical laboratory modelling of continen... more Boutelier, D., Chemenda, A. & Jorand, C. 2002. Thermo-mechanical laboratory modelling of continental subduction: first experiments. In: Schellart , WP and Passchier, C. 2002. Analogue modelling of large-scale tectonic processes. Journal of the Virtual Explorer , 6, 61-65.
In number of orogens (e.g. Alps, Norwegian Caledonides, Dabie Shan) exhumation of UHP/LT rocks wa... more In number of orogens (e.g. Alps, Norwegian Caledonides, Dabie Shan) exhumation of UHP/LT rocks was followed by HT metamorphism and magmatic events both suggesting heating of the crust. We present a geodynamical model based on the thermo-mechanical analogue experiments that allow us to account for this relation between the exhumation and temperature increase. According to the model the continental crust
Uploads
Papers by Cedric Jorand