Organic petrography, porosity and pore size distribution

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Table of contents

1. Scientific background
2. Geological settings
2.1. The Kimmeridge Clay formation (KCF)
2.1.1. Geological background
2.1.2. OM composition and sedimentary cyclicities in the Yorkshire
2.1.3. Samples description and selection
2.2. The Vaca Muerta Formation (VMF)
2.2.1. Geological background
2.2.2. Mineralogy, organic matter composition and maturity
2.2.3. OM composition and sedimentary cyclicities in the VMF
2.2.4. Samples description and selection
3. Analytical methods
3.1. Characterization of natural and thermally matured samples
3.1.1. Anhydrous confined thermal maturation
3.1.2. X-ray diffraction (XRD)
3.1.3. Petrography
3.1.4. Organic geochemistry
3.1.5. Porosity measurements
3.2. Characterization of isolated kerogen
3.2.1. Raman spectroscopy
3.2.2. Petrography
3.2.3. Small-Angle -X-ray scattering (SAXS)
4. Organic petrography and pore structure characterization of natural low-mature and gas-mature marine mudstones: insights into porosity controls in organic-rich source rocks.
4.1. Results
4.1.1. Mineralogy
4.1.2. Organic geochemistry
4.1.3. Petrographic observations
4.1.4. Porosity and pore size distribution
4.2. Discussion
4.2.1. Organic petrography, porosity and pore size distribution .
4.2.2. Thermal maturity involvement in OM-hosted pore genesis .
4.2.3. Secondary OM-hosted pores vs primary organic porosity
4.2.4. TOC and OM composition controls on pore genesis
5. Concomitant organic matter geochemical transformation and porosity development during confined thermal maturation: insights into the influence of organic matter composition on por
Abstract
Introduction
5.1. Results
5.1.1. Mineralogy
5.1.2. Petrography
5.1.3. Bulk and molecular OM geochemical characterization
5.1.4. Pore volume and pore size distribution
5.1. Discussion
5.1.1. Composition, porosity and maturity of the original OM precursor
5.1.2. OM thermal transformations during anhydrous confined thermal maturation
5.1.3. Thermal maturity and OM geochemical composition as controlling factor of KCF mudstones porosity
Summary and conclusions
6. Influence of thermal maturation on the structure of the isolated OM of organic-rich mudstones
6.1. Results
6.1.1. Elemental composition and Raman spectroscopy
6.1.2. SEM and TEM residual OM texture observations
6.1.3. SAXS measurements
6.2. Discussion
6.2.1. Assessment of thermal maturity and OM structure evolution during thermal maturation using Raman spectroscopy
6.2.2. Concomitant evolution of the texture, the structure and porosity of KCF isolated OM with increasing thermal maturity
Summary and conclusions
7. Does the duration of the confined thermal maturation experiments influence the evolution of the porosity of organic-rich source rocks?
7.1. Results
7.1.1. Evolution of bulk and molecular OM geochemical composition during 104 days of thermal maturation
5.1.2. Evolution of pore volume and surface area during 104 days of maturation and comparison with shorter duration experiments.
5.2. Discussion
5.2.1. How useful is it to combine different models for nitrogen adsorption measurements?
5.2.2. Effect of the duration of confined thermal maturation on OM thermal degradation
5.2.3. Does the duration of confined thermal maturation affect the evolution of porosity?
Summary and general discussion
Conclusions
References