Mineralogical and geochemical studies on the Qianjiadian deposit, Songliao Basin, NE China: Insights into multiple metallogenic processes in the sandstone-type uranium deposit
As an important part of tight sandstone, authigenic clay minerals and carbonate cements have a strong influence on the densify of tight sandstone, but the details of these effects on pores and throats need be further clarified. The Ordos Basin is the second-largest sedimentary basin in China with the highest annual oil output and is …
It may have been discovered in the Ordos Basin, Erlian Basin, Ili Basin, and in the Songliao Basin, in China, and some have already reached the scale of large/ultra-large mineral deposits [1]. Sandstone type uranium deposit play an important role in the supply of uranium resources in China.
The Dongsheng sandstone-type U deposit hosted in fluvial and/or deltaic sandstones of the lower member of the Middle Jurassic Zhiluo Formation in the northeastern Ordos Basin has experienced ...
The heterogeneity of pores in uranium deposits of different lithologies is strong and influences the mineral composition and its fabric mode. Coarse sandstone, fine sandstone, and sandy mudstone are favorable for ISL mining in Qianjiadian uranium deposits because their permeability is above the required permeability threshold of ISL.
Petrography, Mineralogy, and Geochemistry of Combustion Metamorphic Rocks in the Northeastern Ordos Basin, China: Implications for the Origin of "White Sandstone"
Diagenesis changes the mineral composition and internal structure of a sandstone rock, and then forms many authigenic minerals that critically change its porosity and infiltration ( Gao and Li, 2016; Li et al., 2017c ). Both high matrix and cement contents lead to densification of a tight sandstone reservoir ( Zhang et al., 2016b ).
Detrital ilmenite and its altered minerals are common in sandstone-hosted U deposits in the northern Ordos Basin, north China. Petrographic observation, SEM-EDS, EMPA, and LA-MC-ICP-MS were utilized to characterize the spatial relationship between altered ilmenite and the U minerals, and to investigate the U enrichment mechanism and …
Fractal dimension is a critical parameter to evaluate the heterogeneity of complex pore structure in tight sandstone gas and other low permeability reservoirs. To quantify the fractal dimension of tight sandstone at various pore size classes and evaluate their implications on mineral composition and nano pore structure parameters, we conducted …
Feldspar dissolution and precipitation of clays and quartz cements are important diagenetic reactions affecting reservoir quality evolution in sandstones with detrital feldspars. We examined two sets of sandstone reservoirs to determine whether the sandstone diagenetic systems were open or closed to the mass transfer of products from feldspar dissolution …
Alterations in the cement minerals affect the pores morphology of tight sandstone depending on their mineralogical structure and texture, and the CO 2 flooding mainly changes the micromorphology and heterogeneity of large pores. Clay minerals dominate the cement in the CL lithofacies of tight sandstone.
In addressing the critical need to understand the geological and diagenetic factors affecting Paleogene sandstone reservoirs in the Baiyun Sag—a region vital for oil and gas exploration—this study delves into the Paleogene Zhuhai and Enping formations. Advanced methodologies, including petrographic thin-section analysis, scanning electron …
The red sandstone samples were subjected to elevated temperatures followed by a series of wet-dry cycles. Our findings reveal a significant alteration in the porous architecture of the sandstone samples post-thermal treatment, primarily attributed to water evaporation and mineral expansion.
Authigenic minerals related to wettability and their impacts on oil accumulation in tight sandstone reservoirs: An example from the Lower Cretaceous Quantou Formation in the southern Songliao Basin, China
The results show that clay mineral-related pores are well developed in lithic sandstone and feldspathic lithic sandstone in addition to pores produced by dissolution of calcite cement and clastic grains. Intergranular pores are connected by lamellar, curved lamellar, and narrow pore throats.
The sandstone is alluvial fan-braided river facies. Minerals associated with these deposits can be broadly categorized as detrital, authigenic, and ore-stage mineralization. Ore minerals consist of uraninite and coffinite. This is the first noted occurrence of coffinite in this type of deposit in China.
Table 2. Trace element (µg/g) composition of combustion metamorphic rocks. - "Petrography, Mineralogy, and Geochemistry of Combustion Metamorphic Rocks in the Northeastern Ordos Basin, China: Implications for the Origin of "White Sandstone""
Iron-bearing mineral assemblages and their distribution patterns directly reflect the redox environ-ment in sediments, which plays a decisive role in the migration and precipitation of U. The Dongsheng sandstone-type U deposit hosted in fluvial and/or deltaic sandstones of the lower member of the Middle Jurassic Zhiluo Formation in the northeastern Ordos …
The high-grade ore mainly exists in the form of uranium mineral, the type of uranium mineral is mainly pitchblende, followed by coffinite, a small amount of uranium mineral containing titanium.
The Mangbang Formation in the Hanbazhai area is part of the uranium ore field in the Longchuanjiang Basin, China. Uraniferous sandstones from this formation are examined in this study. The type ...
In Scotland the clay mineralogy of the Lower ORS in the Midland valley is characterized by a variety of interstratified minerals, including regularly interstratified trioctahedral chlorite-vermiculite, a tosudite mineral similar to that described from South Wales and illite-smectite, as well as occasional illite, chlorite and smectite. The oldest …
The Junggar Basin is an important multi-energy (e.g., oil, gas, and coal) superimposed basin in Northwest China and is also one of the important uranium-producing basins. It is located in the Central Asian sandstone-type uranium formation belt.
The alteration of reservoir wettability induced by authigenic minerals and the impacts on oil accumulation in tight sandstone reservoirs were investigated using a suite of mineralogical and ...
Clarification of the source of the Eocene sediments filling the Huimin depression provides significant support for current and future oil and gas exploration in the Bohai Bay Basin, China. A comprehensive assessment of sediment provenance based on sandstone petrography, heavy mineral assemblages, seismic reflection data, and …
Coal is usually found in many sandstone-hosted uranium deposits in western China. However, it remains unclear whether coal organic matter is related to the mineralization of uranium in sandstone.
Sandstone Basics. Sandstone is a type of rock made from sediment — a sedimentary rock. The sediment particles are clasts, or pieces, of minerals and fragments of rock, thus sandstone is a clastic sedimentary rock. It is composed mostly of sand particles, which are of medium size; therefore, sandstone is a medium-grained clastic …
Semantic Scholar extracted view of "Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW China" by M. Min et al.
A host of mineral occurrences have enriched the state of Haryana. The minerals occurring in this state are primarily china clay, limestone, dolomite, quartz/ silica sand, quartzite, slate. Other minerals, such as, barytes, calcite, feldspar, marble, copper, tin and tungsten are noteworthy. Among building stones, granite, slate, marble, quartzite and sandstone …
Mineral alteration is the key factor affecting the extraction of uranium and pore-plugging during acid in situ leaching (ISL) of uranium deposit. A detailed study of mineral alteration in ISL will help us to better understand pore-plugging mechanism and enlighten us to develop the corresponding de-plugging method. The Wuyier uranium …
Dissolution versus cementation and its role in determining tight sandstone quality: A case study from the Upper Paleozoic in northeastern Ordos Basin, China
Uranium-bearing sandstone diagenesis is a complicated process in the Middle Jurassic Zhiluo Formation,north of Ordos Basin,and mineralization is inconsistent with typical interlayer redox model.On the basis of the study of diagenetic minerals,stable isotope composition(δ13 C andδ18 O)of calcite cements and fluid inclusions in Hangjinqi uranium …
