Natural fractures are widespread in shales in sedimentary basins and can significantly
increase the bulk permeability and enhance fluid flow, which are thereby considered to be a …

Petroleum-bearing fluid inclusions are small encapsulations of oil and gas that offer an
invaluable opportunity to better constrain the evolution of petroleum systems. Insights into …

Fluid overpressures are widely expected during hydrocarbon generation and expulsion from
source rocks, yet direct evidence for this phenomenon is lacking in the case of organic-rich …

Clay rocks are low permeability sedimentary formations that provide records of Earth history,
influence the quality of water resources, and that are increasingly used for the extraction or …

Hydrofractures, or hydraulic fractures, are fractures where a significantly elevated fluid
pressure played a role in their formation. Natural hydrofractures are abundant in rocks and …

Bedding-parallel calcite veins (BPCVs) occur widely in Upper Cretaceous lacustrine shales
of the Qingshankou Formation in the Northern Songliao Basin, China. Research on the …

Abstract In the Late Jurassic–Early Cretaceous Vaca Muerta Formation, previously
unrecognized yet abundant structures constituting a new category of kinematic indicator …

Sparry calcite is common in sedimentary rocks. In mudrocks, it has been reported to occur as
veins in bedding-parallel, oblique, and vertical fractures. Tectonic forces were traditionally …

Field, petrographic and geochemical analysis of fibrous calcite veins in the Lower Jurassic
Shales-with-Beef Member in the Wessex Basin was conducted to investigate the formation …

Bedding-parallel, fibrous calcite veins (commonly referred to as “beefs”) are widely
developed within Eocene, lacustrine, laminated organic-rich source rocks in the Dongying …