Article
Geosciences, Multidisciplinary
Jiaxin Wei, Shou Chen, Yanping Gu, Huaibiao Zhang, Shuai Yin, Hui Yuan
Summary: This study systematically investigates the diagenesis and reservoir properties of the Jurassic Yan 6 to Yan 10 members, proposing a diagenetic evolution sequence and classification criteria for the Jurassic sandstone reservoirs. The research results reveal a structural-lithological reservoir with unified oil-water interface, favorable for hydrocarbon accumulation in Type I and Type II reservoir areas.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Mohammad Adnan Quasim, Shaista Khan, Vineet Kumar Srivastava, Asma Amjad Ghaznavi, Abul Hasnat Masood Ahmad
Summary: Thin-section petrography, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were used to investigate the diagenetic controls on the reservoir quality of the Ridge and Athleta Sandstone members in the Jara dome, Kachchh Basin, western India. The study found that carbonates, iron oxides, silica overgrowth, and authigenic clays like chlorite and kaolinite are the principal cementing materials in the sandstones. The reservoir quality of the sandstone is influenced by compaction, cementation, dissolution of unstable grains, and the precipitation of carbonate cement and silica overgrowths.
GEOLOGICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
D. Ray, A. D. Shukla, S. Bhattacharya, S. Gupta, P. Jha, U. Chandra
Summary: The study reveals that hematite-bearing concretions in the Indian Jhuran sandstone are similar to Martian blueberries but differ geochemically. The concretions are primarily mixtures of goethite and hematite. It is suggested that the Jhuran iron concretions likely formed due to sedimentary diagenetic processes.
PLANETARY AND SPACE SCIENCE
(2021)
Article
Geochemistry & Geophysics
Wenhuan Li, Tailiang Fan, Zhigian Gao, Zhixiong Wu, Ya'nan Li, Xinlei Zhang, Heng Zhang, Fangda Cao
Summary: The Lower Jurassic reservoir in the Niudong area of the northern margin of Qaidam Basin is a typical low permeability sandstone reservoir. The reservoir quality is mainly influenced by diagenesis, with compaction and cementation causing porosity loss and dissolution increasing porosity. Structural features of the study area, like nose uplift structure and developed fractures, provide favorable conditions for reservoir space and migration channels, ultimately improving the reservoir permeability.
Article
Geosciences, Multidisciplinary
Richard H. Worden, James E. P. Utley
Summary: Porosity and permeability are crucial factors in determining the reservoir quality of sandstone. This quality is influenced by primary sedimentary characteristics and subsequent diagenetic modifications. SEM-EDS is a useful tool for studying various aspects of sandstone diagenesis, including mineralogy, particle characteristics, and cement distribution.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Yifan Zhang, Kelai Xi, Yingchang Cao, Xianzhang Yang, Zhenping Xu, Lu Zhou, Guoding Yu, Zhanghua Han, Zehan Zhang
Summary: Understanding diagenetic fluid types and their effects on diagenesis is crucial for identifying control factors of reservoir characteristics and predicting reservoir sweet spots. This study investigated strong cementation in Lower Jurassic Ahe Formation sandstones near a deep-rooted fault using petrographic and geochemical methods. The results suggest the involvement of deep fluids in reservoir diagenesis and highlight the negative effects of deep fluids on diagenetic processes.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Hui Rong, Yangquan Jiao, Liqun Wu, Xinfu Zhao, Minqiang Cao, Weihong Liu
Summary: An exceptional example in the Qianjiadian area, Songliao Basin, illustrates the effects of igneous intrusions on diagenesis and reservoir quality of sandstone. The intrusion of diabase dikes has been found to impact sandstone diagenesis through two stages, resulting in changes in reservoir quality. Hydrothermal fluids generated by the diabase dikes have influenced the development of secondary pores in the sandstone.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Andreas Pauli de Castro, Carlos Conforti Ferreira Guedes, Fernando Farias Vesely, Deise Marli da Silveira, Lara Ferreira Neves
Summary: This study investigates the sedimentary provenance and its control on reservoir quality in the Maracangalha Formation. Petrography analysis and X-Ray Fluorescence data reveal a granite-gneissic terrain as the primary source area for quartz-feldspathic sandstones. The sources contribute recycled sedimentary and metasedimentary rocks, leading to the occurrence of specific litho and quartzose petrofacies. The mineral composition and primary texture of sandstones significantly influence diagenetic processes and the formation of secondary porosity. Understanding sedimentary provenance, composition, and diagenesis is crucial for predicting reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Multidisciplinary Sciences
C. Saetre, H. Hellevang, C. Dennehy, H. Dypvik
Summary: This study investigates the geochemical system of the Rosebank field in the Faroe-Shetland Basin, focusing on the dissolution and precipitation effects at the basalt-sandstone interface. The results show that the dissolution and precipitation processes control the basalt dissolution rate, while diffusion has minimal impact on reservoir quality.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Wenchao Dou, Mian Lin, Luofu Liu, Langbo Jia
Summary: This study investigated the relationship between chlorite rims and porosity evolution in the Chang 7 sandstones of the Upper Triassic Yanchang Formation in the Ordos Basin in northcentral China. The results showed that chlorite rims inhibited the formation of quartz cementation, but other factors such as compaction and other cements also controlled the porosity evolution of sandstones. Chlorite rims only played an important role in porosity preservation when quartz cementation was the main process of porosity destruction.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
V. K. Srivastava, B. P. Singh, Som Dutt, A. Aggarwal
Summary: The present study investigates the processes responsible for the occurrence of Middle Eocene dolomites in the Kachchh Basin in the western Indian Continental Shelf. The study identifies three types of dolomites and suggests an organogenic origin based on the presence of algal micritization and microbial covering. The study also reveals the different types of diagenesis experienced by the dolomites, as well as the potential sources of carbon and methane. The findings highlight the importance of understanding the processes and factors influencing dolomite formation in this region.
CARBONATES AND EVAPORITES
(2022)
Article
Geosciences, Multidisciplinary
Dimitrios Charlaftis, Katherine J. Dobson, Stuart J. Jones, Dmitry Lakshtanov, Jonathan Crouch, Jennie Cook
Summary: Characterization of deeply buried sandstones and their reservoir quality is crucial for energy exploration, development, and storage. This study used hydrothermal experiments and X-ray tomography to investigate the evolution of grain coating volume and porosity in sandstone samples under different temperatures. The results showed that kaolinite pore filling and chlorite precipitation played important roles in reducing porosity and preserving reservoir quality. Pore flow simulations based on temperature-dependent pore networks were used to understand the impact of diagenetic processes on sandstone reservoirs.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Prabal Shankar Das, Rima Chatterjee, Sumangal Dasgupta
Summary: This study used a rock physics template (RPT) approach to model the impacts of mechanical compaction and chemical diagenesis on porosity reduction in the Barail Sandstone. This study also analyzed the effects of diagenesis, rock frame constituents, and pore fluids on seismic amplitude response using a probabilistic amplitude variation with angle (AVA) approach.
NATURAL RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Anjali Choudhary, Bhawanisingh G. Desai, Suruchi Chauhan
Summary: This paper documents the changes in ichnofabric in the distal part of the basin during a basinal-scale transgression. The ichnofabric analysis of the Jumara Formation at the Jara dome suggests an increase in ichnodiversity steadily from member-I to III and then a decline. Comparisons with other coeval sediments of the Kachchh basin indicate high diversity in the Jara dome area.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2023)
Article
Geosciences, Multidisciplinary
Jingdong Liu, Lei Li, Cunjian Zhang, Youlu Jiang, Rudy Swennen, Chengjin Zhao, Shuai Hou
Summary: This study investigates the pore structure and fluid flow behavior in tight sandstone reservoirs of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin. Different types of sandstones possess different pore-throat systems, with clay mineral-related pores and throats being the key factors affecting the pore structure and fluid flow behavior. The findings provide valuable insights for reservoir characterization and development.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Aditya Kharya, Himanshu K. Sachan, Shashi Ranjan Rai
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Sadia Khanam, M. A. Quasim, A. H. M. Ahmad, Sumit K. Ghosh
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2020)
Article
Geosciences, Multidisciplinary
Faiz Ahmad, Mohammad Adnan Quasim, Abul Hasnat Masood Ahmad
Summary: The study on the microfacies and diagenetic processes of the Fort Member limestones in Western Rajasthan suggests that they have high reservoir potential, with various microfacies and diagenetic features indicating deposition and diagenesis in different environments, directly affecting porosity and reservoir quality.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Priyanka Tripathi, O. P. Pandey, J. P. Srivastava, H. K. Sachan, D. V. Subbarao, M. Satyanarayanan, A. Keshav Krishna, Nimisha Vedanti, G. Koti Reddy, K. Rasheed, Sujeet Kumar Dwivedi, G. Parthasarathy
Summary: Integrated geoscientific investigations on basement cores from Maharashtra, India, revealed a complex geological history of high velocity-high density rocks with a subduction zone/arc-related affinity and significant metasomatism. These rocks show evidence of crust-mantle interaction and possible links to earthquake nucleation in intraplate stable regions.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Article
Geology
Aditya Kharya, Himanshu K. Sachan, Christopher J. Spencer, Koushik Sen, Divya Prakash, Shashi Ranjan Rai, Vikash Kumar
Summary: This study focuses on the fluid activity in the Zildat and Shergol ophiolitic melanges of the Indus Suture Zone, presenting fluid-inclusion and isotope geochemistry of quartz-calcite veins to decipher their origin and evolution. The isotopic analysis of calcite veins indicates a mixing model of marine and primitive-mantle fields, with a mid-ocean ridge basalt fluid source for the Zildat veins and enriched-mantle and depleted-MORB-mantle rocks as potential sources for the Shergol veins. The vein-forming fluids were likely introduced into fractures in the host rocks as a result of deformation, with emplacement depths estimated at approximately 2.5 km and temperatures between 200-400 degrees C.
JOURNAL OF GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Sadia Khanam, M. A. Quasim, A. H. M. Ahmad
Summary: The Proterozoic Rajgarh Formation sandstones are texturally immature and compositionally sub-mature, with the reservoir quality strongly influenced by depositional facies and diagenetic modifications. Primary porosity reduction is mainly due to mechanical and chemical compaction in the studied sandstones. Different depositional facies show various diagenetic features such as clay coating, feldspar dissolution, iron-oxide cementation, and pyrite precipitation, impacting both primary and secondary porosity. Depositional environment controls diagenetic pathways and influences reservoir quality, with river-dominated estuary facies considered as potential reservoir rocks.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2021)
Article
Environmental Sciences
Shaikh Asjad, A. H. M. Ahmad, M. A. Quasim, Himanshu K. Sachan
Summary: The geochemical study of the Kuldhar Member Shale in western Rajasthan revealed that it is a Fe-shale with contributions from various rock formations. The source area experienced moderate to high chemical weathering under warm and humid climatic conditions, with sediment source shifting from distal to local over time, indicating a tectonically active basin.
JOURNAL OF SEDIMENTARY ENVIRONMENTS
(2021)
Article
Geosciences, Multidisciplinary
Faiz Ahmad, Mohd Amir, Mohammad Adnan Quasim, Nurul Absar, Abul Hasnat Masood Ahmad
Summary: The detrital mineralogy and geochemical characteristics of the Middle Jurassic Fort Member Sandstone in Western India provide insights into paleoweathering, sediment provenance, and tectonic setting. The sandstones exhibit moderate to intense chemical weathering and originate mainly from felsic igneous rocks. Geochemical analysis suggests a passive margin tectonic setting.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
Talat Ahmad, Irfan Maqbool Bhat, Tsuyoshi Tanaka, Mike Bickle, Yoshihiro Asahara, Hazel Chapman, Himanshu K. Sachan
Summary: The Tso Morari Crystalline Complex in eastern Ladakh consists of eclogites composed of garnet, omphacite, amphibole, phengite, glaucophane, quartz, and iron oxide. Geochemical analysis suggests these eclogites have high Fe-Ti basaltic compositions and originate from depleted-mantle sources. The existing hypothesis of enriched Panjal and Phe volcanics as the protolith for the eclogites is partially negated, and it is proposed that the subducted portion of the depleted Panjal volcanics and Ladakh ophiolitic mafic rocks could be the protolith.
JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Priyanka Tripathi, H. K. Sachan, V Rajagopalan, O. P. Pandey, Sujeet Kumar Dwivedi, G. Parthasarathy
Summary: This study presents a detailed examination of the mineral chemistry and geothermobarometry of the Deccan volcanic covered Neoarchean crystalline basement rocks in the Killari region of Maharashtra, India. The results provide evidence of the composition and formation environment of the rocks, indicating a calc-alkaline nature formed in a subduction zone related environment. Geothermobarometric studies reveal metamorphic temperatures between 540 and 860 degrees C and pressure between 5 to 7 kb, corresponding to depths of 15-21 km. The rocks show deformation, retrogression, and metasomatism by halogen-rich mantle-derived CO2, brought to the surface by ongoing geodynamic processes.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2021)
Article
Geosciences, Multidisciplinary
A. S. A. E. Alsrory, Nabeel A. S. A. Al-Azazi, Mohammed Albaroot, M. A. Quasim
Summary: This study uses one-dimensional basin modelling to examine the hydrocarbon generation and expulsion history of Upper Jurassic source rocks in the Sab'atayn Basin in Yemen. The modelling results reveal significant subsidence and uplift events that have had a notable impact on heat flow distribution and hydrocarbon generation.
GEOLOGICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
M. A. Quasim, Nurul Absar, B. P. Singh, Faiz Ahmad, M. Ashok
Summary: In this study, the major, trace, and rare earth element compositions of the Bijaigarh Shale (BS) were analyzed to infer the composition, weathering history, and tectonic setting of the Mesoproterozoic continental crust. The BS consists of quartz, smectite, kaolinite, and illite, with occasional framboidal pyrites. The high chemical index of alteration (CIA) and plagioclase index of alteration (PIA) values, along with the depletion of certain elements, suggest intense chemical weathering in a warm and humid climate. The REE patterns and immobile element ratios indicate a felsic provenance, with insignificant recycling. The source area is estimated to consist of various granite types and Porcellanite.
JOURNAL OF EARTH SYSTEM SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Aashna Javed, K. F. Khan, M. A. Quasim
Summary: Detailed investigations were conducted on sandstone samples from the Joyan Member of the Jaisalmer Formation. The sandstones are mainly composed of quartz, metamorphic and sedimentary rock fragments, and subordinate feldspar. The detritus for the sandstones is derived from various sources, including metamorphic, volcanic, and recycled sedimentary rocks. The shift in sediment supply suggests sedimentation in a tectonically active basin.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2023)
Article
Agronomy
H. K. Sachan, Deeksha Krishna
Summary: The combination of organic and inorganic fertilizers was found to significantly increase the growth and yield of French beans. The application of nutrients in combination was more effective than using inorganic fertilizers or organic manure alone. The combination of 100% NPK with Poultry manure at 5 t ha(-1) was the most effective for enhancing growth and yield.
Article
Geosciences, Multidisciplinary
Mohammad Adnan Quasim, Shaista Khan, Vineet Kumar Srivastava, Asma Amjad Ghaznavi, Abul Hasnat Masood Ahmad
Summary: Thin-section petrography, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were used to investigate the diagenetic controls on the reservoir quality of the Ridge and Athleta Sandstone members in the Jara dome, Kachchh Basin, western India. The study found that carbonates, iron oxides, silica overgrowth, and authigenic clays like chlorite and kaolinite are the principal cementing materials in the sandstones. The reservoir quality of the sandstone is influenced by compaction, cementation, dissolution of unstable grains, and the precipitation of carbonate cement and silica overgrowths.
GEOLOGICAL JOURNAL
(2021)