Article
Geosciences, Multidisciplinary
Georgia Pe-Piper, David J. W. Piper
Summary: This study investigates the influence of thermal and hydrological conditions on the dissolution of detrital feldspar and the growth of authigenic K-feldspar and albite in the Scotian Basin. The results indicate that burial depth, temperature, salinity of basinal brines, overpressure, and sandstone permeability all play important roles in feldspar diagenesis.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Yingzhi Cui, Igor Shikhov, Rupeng Li, Shitao Liu, Christoph H. Arns
Summary: In this study, the relationship between rock morphology, applied magnetic field strength, resulting relaxation regimes, and observed NMR relaxation responses is investigated numerically. A fine-scale kaolinite model based on SEM images is introduced to address limitations in the discretization of clays typical for micro-CT images. The spatial analysis of relaxation regimes for three different types of sandstone as a function of external magnetic field strength is performed.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Fares Azzam, Thomas Blaise, Makfoula Dewla, Patricia Patrier, Daniel Beaufort, Ahmed Abd Elmola, Benjamin Brigaud, Eric Portier, Jocelyn Barbarand, Sylvain Clerc
Summary: The presence of grain-coating clays plays a crucial role in preserving the reservoir quality of deeply buried sandstones. These clays are of interest in hydrocarbon exploration as they facilitate the discovery of new oil and gas reserves. However, there is limited scientific literature documenting the origin and distribution of these clays in turbidites. This study investigates the mechanisms and parameters governing clay coat development in turbidite sandstones, focusing on the Agat Formation in the Norwegian North Sea. The findings highlight the importance of chlorite coats in maintaining the quality of deeply buried turbidite reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Shengyu Li, Jingchun Tian, Xiaobing Lin, Nanxin Yin, Chao Luo, Dongdong Yang
Summary: This paper presents an integrated study on the diagenetic conditions of Tengger Formation sandstones using various analytical techniques. The findings provide insights into the reservoir rocks and guidance for future petroleum exploration.
Article
Environmental Sciences
Jie Ren, Zhengxiang Lv, Honghui Wang, Jianmeng Wu, Shunli Zhang
Summary: High-precision in situ delta O-18 values obtained using SIMS were utilized to study the origin of quartz cement in deep-buried sandstones in western Sichuan Basin, China. Three distinctive quartz precipitation phases (Q1, Q2, Q3) with different formation temperatures and delta O-18 values were identified through petrographic, CL, and fluid inclusion data analysis. Changes in delta O-18((water)) and trace element composition from Q2 to Q3 indicate significant alterations in pore fluid chemistry due to hydrocarbon emplacement and water-rock interactions.
Article
Geochemistry & Geophysics
Linjun Huang, Yin Liu, Baoli Bian, Yongping Ma, Hailei Liu, Juanjuan Guo, Jian Cao
Summary: The study found strong fluid-rock interactions in hydrocarbon fluid migration pathways, with quartz grains showing dissolution, clay and chlorite formation, and overgrowth. Elemental enrichment in quartz overgrowth suggested that migration of hydrocarbon-bearing fluids may promote exchange between fluids and minerals. Whole-rock geochemical analysis indicated that decreasing element contents can reflect the direction of hydrocarbon-bearing fluid migration and be monitored with three geochemical proxies.
Article
Geochemistry & Geophysics
Ahmed A. Kassem
Summary: The complex depositional, burial, and diagenetic histories pose challenges to the reservoir quality of Late Cretaceous Nezzazat Group sandstones in Northeastern Africa. However, the quality of commercial reservoirs remains maintained despite deep burial, high temperature, and pressure. This study presents an optimal integration of different data sets to address reservoir quality and performance. Factors such as facies, grain size, porosity, and cementation control the reservoir quality. Compaction and secondary diagenetic processes affect porosity, while clay migration within the pore system is a potential source of formation damage.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2023)
Article
Geosciences, Multidisciplinary
Huan Li, Hongtao Zhu, Xiaofeng Du, Xianghua Yang
Summary: This study investigates the impact of fault movement, induced fluid flow, and thermal mudstone evolution on the generation of secondary porosity and diagenesis in Eocene-Miocene sandstones in the Western Bozhong depression. The analysis includes quantitative petrography, stable isotopes, fluorescence, and evaluations of fault movement, seal, and fluid flow. The results show that mudstones at different depths have varying capacities to provide organic acids/CO2 for mineral dissolution and ions for carbonate cement precipitation. Fault movement activates fluid migration, leading to the redistribution of organic acids/CO2 and the acceleration of secondary porosity generation. The study provides a comprehensive understanding of diagenetic models in different depths and can be used as a reference for similar geological analyses.
Article
Geochemistry & Geophysics
Zhenhuan Shen, Zhuang Ruan, Bingsong Yu, Shujun Han, Chenyang Bai, Qiuhong Chang, Tianxia An
Summary: This research investigates the role of diagenetic fluids in the formation of high-quality sandstone reservoirs in the Eocene Shahejie Formation. Petrographic and geochemical analyses reveal that the diagenetic fluids mainly consist of carbonate, authigenic quartz, and clay minerals. The siliceous fluid originates from the dissolution of feldspar, while carbonate cements are primarily controlled by adjacent mudstone. The study also shows that compaction and carbonate cementation have a significant impact on the pore structure of sandstone reservoirs.
Article
Geosciences, Multidisciplinary
Claire Bossennec, Yves Geraud, Johannes Boecker, Bernd Klug, Luca Mattioni, Jean-Pierre Sizun, Masafumi Sudo, Isabelle Moretti
Summary: In-situ delta O-18 measurements in quartz overgrowths within the Buntsandstein Gp. sandstone reservoirs in the Upper Rhine Graben reveal two types of evolution linked to burial temperature increase and injection of allochthonous fluids. The fluids causing quartz cementation are either autochthonous buffered in O-18 from clay illitisation or allochthonous fluids of meteoric origin with delta O-18 below -5%. These results provide insights into the diagenetic history of the region and the initiation of quartz cementation during the Jurassic period, validated by dating results obtained on feldspar overgrowths.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Article
Energy & Fuels
Olakunle J. Oye, Andrew C. Aplin, Ian J. Orland, John W. Valley
Summary: The Fulmar Formation sandstones from the Fulmar Field in the Central North Sea have a burial depth of 3.2 km and a temperature of 128 degrees C. However, their quartz cement content is only 3.7 +/- 1.7% (1 sigma), which is significantly lower than predicted by temperature-related quartz precipitation kinetics models. Oxygen isotope microanalysis of quartz overgrowths indicates limited cementation at temperatures above 110 degrees C. The low volumes of quartz cement can be explained by the effective stress history of the Fulmar Formation, which experienced a decrease in pore fluid pressures and an increase in effective stress due to lateral seal failure.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ingmar Boesing
Summary: The phenomenon of passivity is crucial for various areas of our technological and metal-based civilization, but the mechanisms behind it are still not fully understood. This paper presents a comprehensive model that can simulate the growth and dissolution of oxide films on various metal oxides under external potential. The simulation provides insights into defect concentrations and electric field during passive film growth and dissolution, and proposes an anodic transpassive dissolution mechanism. The simulation shows good agreement with experimental results from the oxidation of iron electrodes. Adding a transpassive dissolution mechanism to oxide film models is the next step towards corrosion prediction based on modeling.
NPJ MATERIALS DEGRADATION
(2023)
Article
Geosciences, Multidisciplinary
Marcus Vinicius Fonseca Santini Tavares, Emilio Velloso Barroso, Anderson Moraes, Aline Theophilo Silva
Summary: This study investigates the impact of brittle deformation on porosity and permeability distribution in poorly consolidated sandstones. Results from numerical modeling align with field measurements, providing insights for geological modeling of poorly consolidated sandstones in Brazilian offshore basins.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Malgorzata Jonczyk-Szostek, Piotr Kanty, Jaroslaw Rybak, Jakub Saloni, Karolina Trybocka
Summary: This paper presents the laboratory testing results of soil-cement composite columns, providing assessment and analysis of their material characteristics, as well as offering guidelines and conclusions for construction and numerical modeling. Prospects and needs for future developments are also proposed based on actual experience.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
A. R. Latifi, S. Saeidijam, M. Derakhshandi, M. Heydari
Summary: This study investigates the theory of electrokinetic barrier process and models it using numerical methods. The experimental results show good agreement with the numerical model.
RESULTS IN ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Yingchang Cao, Jon Gluyas, Xiaoyan Li, Kelai Xi, Yanzhong Wang, Zhenzhen Jia, Peipei Sun, Norman H. Oxtoby
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Yingchang Cao, Zhenzhen Jia, Jon Gluyas, Tian Yang, Yanzhong Wang, Kelai Xi
MARINE AND PETROLEUM GEOLOGY
(2015)
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Jon Gluyas, Yingchang Cao, Norman H. Oxtoby, Zhenzhen Jia, Yanzhong Wang, Kelai Xi, Xiaoyan Li
MARINE AND PETROLEUM GEOLOGY
(2015)
Article
Geosciences, Multidisciplinary
Zhonghong Chen, Xulong Wang, Ming Zha, Yueqian Zhang, Yingchang Cao, Disheng Yang, Kongyou Wu, Yong Chen, Guanghui Yuan
Article
Geosciences, Multidisciplinary
Zhonghong Chen, Yingchang Cao, Xulong Wang, Longwei Qiu, Yong Tang, Guanghui Yuan
JOURNAL OF ASIAN EARTH SCIENCES
(2016)
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Yingchang Cao, Yongchao Zhang, Jon Gluyas
MARINE AND PETROLEUM GEOLOGY
(2017)
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Yingchang Cao, Jon Gluyas, Xu Cao, Wenbo Zhang
Article
Geosciences, Multidisciplinary
Kelai Xi, Yingchang Cao, Keyu Liu, Jens Jahren, Rukai Zhu, Guanghui Yuan, Helge Hellevang
JOURNAL OF ASIAN EARTH SCIENCES
(2019)
Article
Geosciences, Multidisciplinary
Yanzhong Wang, Miruo Lin, Kelai Xi, Yingchang Cao, Jian Wang, Guanghui Yuan, Muhammad Kashif, Mingshui Song
MARINE AND PETROLEUM GEOLOGY
(2018)
Article
Energy & Fuels
Cao Yingchang, Yuan Guanghui, Li Xiaoyan, Wang Yanzhong, Xi Kelai, Wang Xiaoming, Jia Zhenzhen, Yang Tian
Article
Geosciences, Multidisciplinary
Guanghui Yuan, Yingchang Cao, Longwei Qiu, Zhonghong Chen
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)