Organic Petrology and Geochemistry: Exploring the Organic-Rich Facies

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 403

Special Issue Editors


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Guest Editor
1. LAFO—Laboratório de Palinofácies & Fácies Orgânica, Departamento de Geologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
2. Institute of Earth Sciences—Porto Pole, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
Interests: organic petrology; palynofacies; kerogen; maceral; solid bitumen; depositional paleoenvironment; organic geochemistry; organic facies
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
British Geological Survey, Nottingham, UK
Interests: depositional environment; thermal maturity; gas sorption; porosity; permeability; rock mechanics

Special Issue Information

Dear Colleagues,

A multidisciplinary approach, incorporating organic petrology and geochemistry (both organic and inorganic), provides fundamental insights into the characterization of organic-rich facies in sedimentary basins. The lateral and vertical distribution of these facies is influenced by depositional environmental features, including primary productivity, organic matter input, water column redox conditions, and sediment accumulation rates. By examining various organic and inorganic facies across different basins and integrating petrological and geochemical data, a more comprehensive understanding of the diagenetic processes affecting organic matter can be achieved. This approach facilitates the identification of key factors controlling the preservation and alteration of organic matter, with particular emphasis on kerogen types and their transformation pathways. Such insights provide new perspectives on interpretating the characteristics and potential of hydrocarbon reservoirs. Understanding the organic facies of source rocks is also crucial as the world shifts its focus on "advantaged hydrocarbons" in the context of the energy transition.

This Special Issue will explore the intricate relationships between organic matter types, depositional environments, thermal maturity, and the interplay between organic and inorganic components within organic-rich facies in sedimentary basins. We invite contributions that adopt a multidisciplinary approach and a broad spectrum of techniques for analyzing organic matter, both petrographic and geochemical. Studies that investigate the relationships between organic and inorganic matter are welcomed, as they provide valuable insights into the complex processes governing the evolution of sedimentary basins.

We thank you and look forward to receiving your contributions.

Dr. Paula Alexandra Gonçalves
Dr. Qian Zhang
Guest Editors

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Keywords

  • organic-rich facies
  • organic petrology
  • organic geochemistry
  • inorganic geochemistry
  • palynofacies
  • biomarkers
  • scanning electron microscopy
  • stable isotope geochemistry
  • kerogen
  • thermal maturation
  • depositional paleoenvironment
  • basin analysis

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Published Papers (1 paper)

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Research

20 pages, 7348 KiB  
Article
Bitumen Characteristics, Genesis, and Hydrocarbon Significance in Paleozoic Reservoirs: A Case Study in the Kongxi Slope Zone, Dagang Oilfield, Huanghua Depression
by Da Lou, Yingchang Cao and Xueyu Han
Minerals 2025, 15(5), 443; https://doi.org/10.3390/min15050443 - 25 Apr 2025
Abstract
The Paleozoic strata in the Kongxi slope zone of the Dagang oilfield, Huanghua depression, exhibit significant hydrocarbon exploration potential. Although bitumen is widely present in the Paleozoic reservoirs, its formation process and genetic mechanism remain poorly understood. This study systematically investigates the occurrence, [...] Read more.
The Paleozoic strata in the Kongxi slope zone of the Dagang oilfield, Huanghua depression, exhibit significant hydrocarbon exploration potential. Although bitumen is widely present in the Paleozoic reservoirs, its formation process and genetic mechanism remain poorly understood. This study systematically investigates the occurrence, maturity, origin, and evolutionary processes of Paleozoic reservoir bitumen in the Kongxi zone through core observations, microscopic analyses, geochemical testing, and thermal simulation experiments. The results reveal that reservoir bitumen in the Kongxi slope zone is characteristically black with medium to medium-high maturity. In core samples, bitumen occurs as bands, veins, lines, and dispersions within partially filled fractures and breccia pores. Petrographic analysis shows bitumen partially occupying intergranular pores and intergranular pores of Lower Paleozoic carbonate rocks and Upper Paleozoic sandstones, either as complete or partial pore fills. Additional bitumen occurrences include strip-like deposits along microfractures and as bitumen inclusions. Dark brown bitumen fractions were also identified in crude oil separates. The formation and evolution of Paleozoic reservoir bitumen in the Kongxi slope zone occurred in two main stages. The first-stage bitumen originated from Ordovician marine hydrocarbon source rocks, subsequently undergoing oxidative water washing and biodegradation during tectonic uplift stage. This bitumen retains compositional affinity with crude oils from Lower Paleozoic carbonate rocks. Second-stage bitumen formed through the thermal evolution of Carboniferous crude oil during deeper burial, showing compositional similarities with Carboniferous source rocks and their oil. This two-stage bitumen evolution indicates charging events in the Paleozoic reservoirs. While early uplift and exposure destroyed some paleo-reservoirs, unexposed areas within the Dagang oilfield may still contain preserved primary accumulations. Furthermore, second-stage hydrocarbon, dominated condensates derived from Carboniferous coal-bearing sequences since the Eocene, experienced limited thermal evolution to form some bitumen. These condensate accumulations remain the primary exploration target in the Paleozoic Formations. Full article
(This article belongs to the Special Issue Organic Petrology and Geochemistry: Exploring the Organic-Rich Facies)
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