7 Molecular distributions and geochemical implications of pyrrolic nitrogen compounds in crude oils
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Chuanyuan Wang
Abstract
A suite of oils from the Tarim Basin, Qaidam Basin, Ordos Basin, and Liaohe Basin, China was characterized geochemically to clarify factors other than lateral migration that can affect the concentrations and distributions of pyrrolic nitrogen compounds (PNCs) in crude oils. Except for oil fractionation during migration, facies and depositional environment and maturity also affect the distribution of PNCs. The relative distribution of pyrrole isomers may vary with the depositional environment. The isomers with high shielding degree are relatively enriched with the increase of maturity, which is consistent with the principle of thermodynamic equilibrium. Biodegradation is another factor which can alter PNCs behavior in oils. Partially shielded dimethylcarbazole isomers appear to be more susceptible to biodegradation than their exposed counterparts. Benzo[c]carbazole seems to show a higher ability to resist biodegradation than benzo[a]carbazole in heavily biodegraded oils. It was determined that PNCs have potential significance in evaluating oil migration, paleo environment, thermal maturity, and the degree of biodegradation. The PNCs could provide another useful diagnostic means for spill source identification at their lightly to moderately weathered stages.
Abstract
A suite of oils from the Tarim Basin, Qaidam Basin, Ordos Basin, and Liaohe Basin, China was characterized geochemically to clarify factors other than lateral migration that can affect the concentrations and distributions of pyrrolic nitrogen compounds (PNCs) in crude oils. Except for oil fractionation during migration, facies and depositional environment and maturity also affect the distribution of PNCs. The relative distribution of pyrrole isomers may vary with the depositional environment. The isomers with high shielding degree are relatively enriched with the increase of maturity, which is consistent with the principle of thermodynamic equilibrium. Biodegradation is another factor which can alter PNCs behavior in oils. Partially shielded dimethylcarbazole isomers appear to be more susceptible to biodegradation than their exposed counterparts. Benzo[c]carbazole seems to show a higher ability to resist biodegradation than benzo[a]carbazole in heavily biodegraded oils. It was determined that PNCs have potential significance in evaluating oil migration, paleo environment, thermal maturity, and the degree of biodegradation. The PNCs could provide another useful diagnostic means for spill source identification at their lightly to moderately weathered stages.
Chapters in this book
- Frontmatter I
- About the Editor V
- Preface VII
- Contents IX
- 1 Introduction to oil chemistry 1
- 2 Chemical fingerprints and chromatographic analysis of crude oils and petroleum products 47
- 3 Advances in Fourier transform mass spectrometry forensic tools for naphthenic acid fraction compounds in oil sand environmental samples and crude oil 127
- 4 Heavy oil resin composition and their influence on asphaltene stability 177
- 5 Asphaltenes: structures and applications 203
- 6 Asphaltene equation of state and oilfield reservoirs 307
- 7 Molecular distributions and geochemical implications of pyrrolic nitrogen compounds in crude oils 361
- 8 Analysis of petroleum-related samples by soft ionization/high-resolution mass spectrometry 383
- 9 Non-combustion applications of petroleum chemistry 423
- 10 Biomarkers in crude oils 449
- 11 Photooxidation of crude oil: formation, characterization, and fate of oil photoproducts in the environment 519
- 12 Molecular structure characterization of crude oil and its products by mass spectrometry 547
- 13 The distillation precipitation fractionation mass spectrometry (DPF-MS) method for molecular profiling of crude oil 619
- 14 Hyphenated gas chromatography and mass spectrometry techniques for the analysis of crude oil and petroleum products 643
- List of contributing authors 679
- Index 683
Chapters in this book
- Frontmatter I
- About the Editor V
- Preface VII
- Contents IX
- 1 Introduction to oil chemistry 1
- 2 Chemical fingerprints and chromatographic analysis of crude oils and petroleum products 47
- 3 Advances in Fourier transform mass spectrometry forensic tools for naphthenic acid fraction compounds in oil sand environmental samples and crude oil 127
- 4 Heavy oil resin composition and their influence on asphaltene stability 177
- 5 Asphaltenes: structures and applications 203
- 6 Asphaltene equation of state and oilfield reservoirs 307
- 7 Molecular distributions and geochemical implications of pyrrolic nitrogen compounds in crude oils 361
- 8 Analysis of petroleum-related samples by soft ionization/high-resolution mass spectrometry 383
- 9 Non-combustion applications of petroleum chemistry 423
- 10 Biomarkers in crude oils 449
- 11 Photooxidation of crude oil: formation, characterization, and fate of oil photoproducts in the environment 519
- 12 Molecular structure characterization of crude oil and its products by mass spectrometry 547
- 13 The distillation precipitation fractionation mass spectrometry (DPF-MS) method for molecular profiling of crude oil 619
- 14 Hyphenated gas chromatography and mass spectrometry techniques for the analysis of crude oil and petroleum products 643
- List of contributing authors 679
- Index 683
