Fracture stratigraphy controls karst localization within a carbonate sequence with terrigenous input: Implications for conduit-seal layer development in a karst system

Article Geosciences, Multidisciplinary

Siliciclastic content controls the sealing behavior of layers and karst development in a carbonate-siliciclastic sequence, Salitre Formation, Brazil

Rebeca S. Lima et al.

Summary: This study investigates how sedimentary facies control the vertical distribution and the development of karst features in carbonate units, with the siliciclastic content controlling the degree of karstification at different scales.

MARINE AND PETROLEUM GEOLOGY (2023)

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Article Geosciences, Multidisciplinary

Burial stylolites enhance karst dissolution and control cave geometry in heterolithic carbonates, Salitre Formation, Brazil

Cayo C. C. Pontes et al.

Summary: This study investigated the relationship among the 2D geometry, stratigraphy, and petrophysical properties of a cave system developed in a Neoproterozoic mixed carbonate-siliciclastic sequence. The study found that bedding-parallel stylolites play an important role in the porosity and dissolution of the rocks. The presence of closely spaced and thicker stylolites correlates with higher karstification intensity, while greater spacing or absence of stylolites leads to less karstification. These findings have significant implications for predicting subsurface permeability in karstified carbonate reservoirs.

MARINE AND PETROLEUM GEOLOGY (2023)

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Article Geosciences, Multidisciplinary

Pore network characteristics as a function of diagenesis: Implications for epigenic karstification in shallow-water carbonates

Renata E. B. Araujo et al.

Summary: Karst processes play a critical role in the development of porosity and permeability in carbonate reservoirs and aquifers. This study examines the interaction between fluid flow pathways and diagenesis in an epigenic karst setting in the Potiguar Basin, Brazil. The results demonstrate the importance of karst dissolution in creating karst cavities, and how various types of porosity can be connected to fractures, veins, and stylolites at the microscale. Additionally, karst dissolution can increase overall rock permeability through cement dissolution and fracturing during different diagenetic stages.

MARINE AND PETROLEUM GEOLOGY (2023)

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Article Geosciences, Multidisciplinary

Three-dimensional characterization of karstic dissolution zones, fracture networks, and lithostratigraphic interfaces using GPR cubes, core logs, and petrophysics: Implications for thief zones development in carbonate reservoirs

Juliana A.G. Lopes et al.

MARINE AND PETROLEUM GEOLOGY (2023)

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Article Geosciences, Multidisciplinary

Mechanical stratigraphy controls fracture pattern and karst epigenic dissolution in folded Cretaceous carbonates in semiarid Brazil

Fabrizio Balsamo et al.

Summary: Fractures and karst are common in carbonate reservoirs and have a significant impact on the permeability of the rock. Understanding the characteristics and distribution of these features is crucial for modeling reservoirs, predicting fluid flow, and estimating fluid recoveries.

MARINE AND PETROLEUM GEOLOGY (2023)

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Article Energy & Fuels

Advancements towards DFKN modelling: Incorporating fracture enlargement resulting from karstic dissolution in discrete fracture networks

Juliana A. G. Lopes et al.

Summary: This study presents a multiscale approach to develop a deterministic Discrete Fracture Network (DFN) model in low-porosity carbonate rocks, which includes fracture enlargement due to karstic dissolution. Through a case study using field and unmanned aerial vehicle (UAV) imagery data, it is found that advanced stages of karstification can modify the aperture-length relationship of fractures, leading to a constant value of aperture as the degree of dissolution increases. This allows for quantitatively accounting for fracture enlargement and shows that it can significantly increase the transmissivity of a karstified fracture network without changing connectivity.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2022)

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Article Energy & Fuels

Why is it easy to form high-quality reservoirs in a mixed siliciclastic-carbonate system? Evidence from diagenetic characteristics

Xuebin Du et al.

Summary: This study investigates the characteristics and formation mechanisms of mixed siliciclastic-carbonate reservoirs in the Bozhong Sag, Bohai Bay Basin, China, using a combination of reservoir geological and geochemical evidence. The results show that bioclastic-dominated mixed rocks represent high-quality reservoirs due to the presence of primary and secondary pores. The main diagenetic processes include micritization, cementation, dissolution, and compaction.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2022)

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Article Geosciences, Multidisciplinary

The impact of heterogeneous mixed siliciclastic-carbonate systems on CO2 geological storage

Azadeh Pourmalek et al.

Summary: This study focuses on the significance of three different outcrops in understanding the impact of mixed facies on CO2 storage. It demonstrates that reservoir systems with mixed carbonate-siliciclastic facies contribute to improving the safe and effective storage of CO2.

PETROLEUM GEOSCIENCE (2022)

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Article Geosciences, Multidisciplinary

Silicification, flow pathways, and deep-seated hypogene dissolution controlled by structural and stratigraphic variability in a carbonate-siliciclastic sequence (Brazil)

Luca Pisani et al.

Summary: This paper documents the relationships between stratigraphy, structural patterns, silicification, and the spatial-morphological organization of a 3D multistorey cave system developed in a Neoproterozoic mixed carbonate-siliciclastic sequence. The combination of lithology, silicification, fracture patterns, and petrophysical properties control the formation of high or low permeability zones, which are fundamental for the spatial organization of dissolution and the compartmentalization of the resulting conduit system. The Calixto Cave is an enlightening example for the complex speleogenetic history affecting a mixed carbonate-siliciclastic succession.

MARINE AND PETROLEUM GEOLOGY (2022)

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Article Geosciences, Multidisciplinary

Karstified layers and caves formed by superposed epigenic dissolution along subaerial unconformities in carbonate rocks-Impact on reservoir-scale permeability

Fabio Luiz M. Bagni et al.

Summary: Superposed events of rock exposure, fracturing, and hydrological dynamics play important roles in epigenic karstification in carbonate reservoirs. This study investigates the effects of superposed meteoric dissolution events in carbonate rocks and suggests that subaerial unconformities can lead to better reservoir qualities by facilitating freshwater leaching and karstification. The study also highlights the importance of faults and fractures in controlling vertical pore distribution within hydrological zones and the role of water table fluctuations in the development of multilevel caves and conduits. The findings have implications for assessing reservoir location and quality in large areas.

MARINE AND PETROLEUM GEOLOGY (2022)

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Article Geosciences, Multidisciplinary

The influence of subseismic-scale fracture interconnectivity on fluid flow in fracture corridors of the Brejoes carbonate karst system, Brazil

Carla P. Q. Furtado et al.

Summary: The present study used a multitool approach to characterize fractures in large fracture corridors, caves, and canyons and investigated their impact on fluid flow in carbonate units. The study revealed that fracture corridors comprise multiple subvertical and conjugate fracture sets, which have a significant influence on fluid flow. The formation of secondary macroporosity provides insights for the study of reservoirs formed in similar structural controls.

MARINE AND PETROLEUM GEOLOGY (2022)

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Article Geosciences, Multidisciplinary

Depositional characteristics of a lacustrine mixed sediment system: A case study from the eastern Shijiutuo Uplift, offshore Bohai Bay Basin, eastern China

Maosong Ye et al.

Summary: This study investigates lacustrine mixed sediments from the Eocene period in the Qinhuangdao-A block in central Bohai Bay Basin. The research integrates seismic, core data, and microscopic analysis to reveal the formation and evolution of the mixed sediment system. The findings show how lake-level changes affect the depositional sequence of mixed sediments in a continental setting.

JOURNAL OF ASIAN EARTH SCIENCES (2021)

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Article Geosciences, Multidisciplinary

Structural and sedimentary discontinuities control the generation of karst dissolution cavities in a carbonate sequence, Potiguar Basin, Brazil

Renata E. B. Araujo et al.

Summary: This study investigates the control of structural discontinuities on the generation of karst dissolution cavities in carbonate rocks. Bed-perpendicular stylolites and fractures can be enlarged by meteoric water percolation, forming a single channel system, while bed-parallel stylolites can contribute to horizontal fluid flow.

MARINE AND PETROLEUM GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Diagenetic controls on reservoir quality of a mixed carbonate-siliciclastic system: Sycamore Formation, Sho-Vel-Tum Field, Oklahoma, USA

David Duarte et al.

Summary: Reservoir quality is closely related to diagenesis, and understanding the impact of geological factors on diagenetic evolution can help predict porosity and permeability in formations. This study in southern Oklahoma aims to determine the influence of diagenesis on reservoir quality in the mixed carbonate-siliciclastic Sycamore Formation, providing valuable insights for exploration and development of unconventional reservoirs.

MARINE AND PETROLEUM GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Fault-controlled upwelling of low-T hydrothermal fluids tracked by travertines in a fold-and-thrust belt, Monte Alpi, southern apennines, Italy

L. Smeraglia et al.

Summary: Active faults within the southern Apennines fold-and-thrust belt control the upwelling of hydrothermal fluids at surface. The study in the Monte Alpi area reveals that travertines formed in a paleo-fluvial environment precipitated from CO2-rich meteoric-derived fluids. High-permeability fluid conduits localized along fault zones at fault intersections, while low-permeability fault zones were observed in clay smeared fault segments in shales and metapelites.

JOURNAL OF STRUCTURAL GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Hydrothermal silicification confined to stratigraphic layers: Implications for carbonate reservoirs

Victor H. P. Souza et al.

Summary: Hydrothermal silicification plays a significant role in carbonate reservoirs, with sedimentary facies and stratigraphy influencing the process. The Cristal Cave study in Brazil reveals differences in silicification degrees and vertical distribution within the stratigraphic units, contributing to the understanding of silicified carbonate reservoirs.

MARINE AND PETROLEUM GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Flow pathways in multiple-direction fold hinges: Implications for fractured and karstified carbonate reservoirs

Cayo C. C. Pontes et al.

Summary: This study focused on the development of caves in carbonate units, investigating the roles of fractures and folds in the formation of karst conduits and flow pathways in carbonate reservoirs. The conduit shape, typically ellipsoidal in cross-section, reflects tectonic features and textural variations, with carbonate layers containing pyrite and low detritic mineral contents being favorable flow pathways. The development of the karst system was found to be related to fracture corridors formed along fold hinges, contributing to the formation of super-K zones.

JOURNAL OF STRUCTURAL GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Paleogeographic constraints on source area and depositional systems in the Neoproterozoic Irece Basin, Sao Francisco Craton

Ana Santana et al.

Summary: The study examines the characteristics and detrital zircon analysis of the Neoproterozoic carbonate sequences in the Irece Basin on top of the Sao Francisco Craton. Results indicate the formation of the basin as an extension of the Neoproterozoic passive margin, with a possible unconformity and a maximum depositional age of approximately 670 million years.

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES (2021)

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Article Geosciences, Multidisciplinary

High-permeability zones in folded and faulted silicified carbonate rocks ? Implications for karstified carbonate reservoirs

Vincenzo La Bruna et al.

Summary: By studying the Cristal Cave Karst System in the São Francisco Craton of Brazil, it was found that the cave system occurs in a regional folded sector and high-permeability zones are formed along fracture corridors at the fold hinges.

MARINE AND PETROLEUM GEOLOGY (2021)

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Article Geosciences, Multidisciplinary

Structural diagenesis of shallow platform carbonates: Role of early embrittlement on fracture setting and distribution, case study of Monte Alpi (Southern Apennines, Italy)

Vincenzo La Bruna et al.

JOURNAL OF STRUCTURAL GEOLOGY (2020)

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Article Geosciences, Multidisciplinary

Fracture stratigraphy and DFN modelling of tight carbonates, the case study of the Lower Cretaceous carbonates exposed at the Monte Alpi (Basilicata, Italy)

Giuffrida Alessandro et al.

MARINE AND PETROLEUM GEOLOGY (2020)

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Article Geosciences, Multidisciplinary

Influence of fracture stratigraphy on hypogene cave development and fluid flow anisotropy in layered carbonates, NE Brazil

F. Balsamo et al.

MARINE AND PETROLEUM GEOLOGY (2020)

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Article Geosciences, Multidisciplinary

Karst dissolution along fracture corridors in an anticline hinge, Jandaira Formation, Brazil: Implications for reservoir quality

Fabio Luiz Bagni et al.

MARINE AND PETROLEUM GEOLOGY (2020)

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Article Geosciences, Multidisciplinary

Are stylolites fluid-flow efficient features?

Pierre-Olivier Bruna et al.

JOURNAL OF STRUCTURAL GEOLOGY (2019)

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Article Geosciences, Multidisciplinary

Fracture simulation parameters of fractured reservoirs: Analogy with outcropping carbonates of the Inner Apulian Platform, southern Italy

Alessandro Giuffrida et al.

JOURNAL OF STRUCTURAL GEOLOGY (2019)

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Article Geosciences, Multidisciplinary

The conduit-seal system of hypogene karst in Neoproterozoic carbonates in northeastern Brazil

Caroline L. Cazarin et al.

MARINE AND PETROLEUM GEOLOGY (2019)

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Article Geosciences, Multidisciplinary

Linking natural fractures to karst cave development: a case study combining drone imagery, a natural cave network and numerical modelling

Quinten Boersma et al.

PETROLEUM GEOSCIENCE (2019)

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Article Geography, Physical

Structural control on karst water circulation and speleogenesis in a lithological contact zone: The Bossea cave system (Western Alps, Italy)

Marco Antonellini et al.

GEOMORPHOLOGY (2019)

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Review Geosciences, Multidisciplinary

Stylolites: A review

R. Toussaint et al.

JOURNAL OF STRUCTURAL GEOLOGY (2018)

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Expanding the spectrum of shallow-marine, mixed carbonate-siliciclastic systems: Processes, facies distribution and depositional controls of a siliciclastic-dominated example

Ernesto Schwarz et al.

SEDIMENTOLOGY (2018)

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Types of mixing and heterogeneities in siliciclastic-carbonate sediments

Domenico Chiarella et al.

MARINE AND PETROLEUM GEOLOGY (2017)

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Palaeoproterozoic assembly of the Sao Francisco craton, SE Brazil: New insights from U-Pb titanite and monazite dating

Carmen Aguilar et al.

PRECAMBRIAN RESEARCH (2017)

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Hypogenic origin, geologic controls and functional organization of a giant cave system in Precambrian carbonates, Brazil

Alexander Klimchouk et al.

GEOMORPHOLOGY (2016)

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Fracture characteristics in Cretaceous platform and overlying ramp carbonates: An outcrop study from Maiella Mountain (central Italy)

Andrea Rustichelli et al.

MARINE AND PETROLEUM GEOLOGY (2016)

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Fracture stratigraphy and fluid flow properties of shallow-water, tight carbonates: The case study of the Murge Plateau (southern Italy)

E. Panza et al.

MARINE AND PETROLEUM GEOLOGY (2016)

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The characteristics of open fractures in carbonate reservoirs and their impact on fluid flow: a discussion

Ole Petter Wennberg et al.

PETROLEUM GEOSCIENCE (2016)

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Superposed folding and associated fracturing influence hypogene karst development in Neoproterozoic carbonates, Sao Francisco Craton, Brazil

Renata A. Ennes-Silva et al.

TECTONOPHYSICS (2016)

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The gas effective permeability of porous media with Klinkenberg effect

Cuihong Li et al.

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The use of topology in fracture network characterization

David J. Sanderson et al.

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Fracture corridors as seal-bypass systems in siliciclastic reservoir-cap rock successions: Field-based insights from the Jurassic Entrada Formation (SE Utah, USA)

Kei Ogata et al.

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Potential use of calcareous mudstones in low hydraulic conductivity earthen barriers for environmental applications

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ENVIRONMENTAL TECHNOLOGY (2013)

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Porosity gain and loss in unconventional reservoirs: Example of rock typing in Lower Cretaceous hemipelagic limestones, SE France (Provence)

Pierre-Olivier Bruna et al.

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Structural and petrophysical characterization of mixed conduit/seal fault zones in carbonates: Example from the Castellas fault (SE France)

Christophe Matonti et al.

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Sedimentary and diagenetic controls on the multiscale fracturing pattern of a carbonate reservoir: The Madison Formation (Sheep Mountain, Wyoming, USA)

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Structural and host rock controls on the distribution, morphology and mineralogy of speleothems in the Castanar Cave (Spain)

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Fracture stratigraphy controls karst localization within a carbonate sequence with terrigenous input: Implications for conduit-seal layer development in a karst system

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