Variation in the chemical composition of carbonate rocks of Russian platform

1957 ◽  
Vol 12 (3) ◽  
pp. 273-276 ◽  
Author(s):  
A.P. Vinogradov ◽  
A.B. Ronov ◽  
V.M. Ratynskii
Keyword(s):  
Chemical Composition ◽  
Carbonate Rocks ◽  
Russian Platform

Optimization of Smart Water Chemical Composition for Carbonate Rocks Through Comparison of Active Cations Performance

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Malek Jalilian ◽  
Peyman Pourafshary ◽  
Behnam Sedaee Sola ◽  
Mosayyeb Kamari
Keyword(s):  
Chemical Composition ◽  
Oil Recovery ◽  
Carbonate Rocks ◽  
Low Cost ◽  
Recovery Phase ◽  
Ion Concentration ◽  
Water Flooding ◽  
Core Flooding ◽  
Smart Water ◽  
The Impact

Designing smart water (SW) by optimizing the chemical composition of injected brine is a promising low-cost technique that has been developed for both sandstone and carbonate reservoirs for several decades. In this study, the impact of SW flooding during tertiary oil recovery phase was investigated by core flooding analysis of pure limestone carbonate rocks. Increasing the sulfate ion concentration by using CaSO4 and MgSO4 of NaCl concentration and finally reducing the total salinity were the main manipulations performed to optimize SW. The main objective of this research is to compare active cations including Ca2+ and Mg2+ in the presence of sulfate ions (SO42−) with regard to their efficiency in the enhancement of oil production during SW flooding of carbonate cores. The results revealed a 14.5% increase in the recovery factor by CaSO4 proving its greater effectiveness compared to MgSO4, which led to an 11.5% production enhancement. It was also realized that low-salinity water flooding (LSWF) did not lead to a significant positive effect as it contributed less than 2% in the tertiary stage.

PECULIARITIES OF DISTRIBUTION AND COMPOSITION OF BETAFITE FROM DIFFERENT FORMATIONS OF THE ALDAN SHIELD (SAKHA-YAKUTIA)

2019 ◽  
pp. 8-15
Author(s):  
V. Guliy ◽  
I. Poberezhska ◽  
N. Bilyk
Keyword(s):  
Chemical Composition ◽  
Mineral Composition ◽  
Oxygen Isotopes ◽  
Carbonate Rocks ◽  
Aldan Shield ◽  
Mineralogical Composition ◽  
Significant Feature ◽  
Carbon And Oxygen Isotopes ◽  
Primary Composition ◽  
Geological Formations

Character of Nb and Ta distribution in the different geological formations of the Aldan Shield are given in this article. To get idea about betafite from different endogenic etalon formations the authors analyzed its well known locations in the pegmatites, skarns, carbonatites, metasomatites and late veins segregations. Geological setting and mineralogical composition of the apatite-bearing rocks from the Aldan Shield are described, and the most significant in scale metamorphosed carbonate and silicate varieties among them have been distinguished. Apatite mineralization in magnesium skarns and metasomatites is developed locally. Titanite and betafite are the main concentrators of Nb and Ta and apatite is typical accompanying mineral in the studied rocks. Betafite was detected in the pegmatite bodies from magnesium skarns and metasomatites of the Shield with irregular distribution within rocks rich and poor in apatite, but was not found in the most developed apatite-carbonate rocks which are regarded as ores of the Seligdar type, so it cannot be mineralogical indicator for this type of ores. Late carbonate generations are significantly enriched in light carbon and oxygen isotopes in contrast to positive δ13Ñ values in apatitecarbonate bodies of the Seligdar deposit and its family and the highest δ18Î values. We used these indicators to distinguish origin of the rocks with various carbonate generations, which have different amounts of betafite. Appearance of betafite is determined by primary composition of the initial rocks. Chemical composition of betafites from the skarns and metasomatites is similar, but with local variations. The most significant feature of the mineral composition is very low Ta content. Titanite is characterized by variable amounts of Nb and Ta in scale of sectors as well as within separate grains.

THE EFFECT OF VARIATIONS IN CHEMICAL COMPOSITION ON THE VELOCITY OF SEISMIC WAVES IN CARBONATE ROCKS

Geophysics ◽  
1953 ◽  
Vol 18 (1) ◽  
pp. 104-115 ◽  
Author(s):  
Carl Kisslinger
Keyword(s):  
Chemical Composition ◽  
Carbonate Rocks ◽  
Seismic Waves ◽  
Mineral Content ◽  
Magnesium Carbonate ◽  
Volume Replacement ◽  
Textural Characteristics ◽  
Local Porosity ◽  
Carbonate Material

The variations of velocity in limestones have not fallen into as definite a pattern as have those in sandstones and shales. Although it is conceded generally that textural characteristics are more important than mineral content in determining the velocity in sandstones and shales, the possibility that the concentration of magnesium carbonate may appreciably alter the velocity in a limestone is investigated. It is found that dolomitization can be expected to have an effect on the velocity, but that effect is not certain, in that it depends on the nature of the dolomitization process. A volume for volume replacement of calcite by dolomite tends to increase the velocity, but dolomitization giving rise to local porosity, whether the resulting interstices are empty or filled by non‐carbonate material, tends to decrease the velocity.

scholarly journals Мetasomatic rocks after shungite-bearing rocks of the Maksovo Deposit, Onega Structure, Karelia

2019 ◽  
pp. 149-164
Author(s):  
L. V. Kuleshevich ◽  
М. М. Filippov ◽  
N. А. Goltsin ◽  
R. Sh. Krymsky ◽  
K. I. Lokhov
Keyword(s):  
Chemical Composition ◽  
Carbonate Rocks ◽  
Sedimentary Rocks ◽  
Northwestern Part ◽  
K Concentration ◽  
Qualitative Characteristics

The Maksovo metasapropelite deposit, which contains shungite matter and is called maksovite, is located in the eastern Onega structure. The deposit is a diapiric fold which formed ca. 2070±10 Ma ago. It is underlain by carbonate rocks and overlain by tuff siltstones and is cross-cut by 1956±5 Ma gabbro-dolerites. Unaltered maksovites are pelitomorphic rocks with a massive to mildly layered texture and moderate concentrations of all petrogenic components and Сorg of about 30%. Fe-Mg rich and alkaline metasomatic rocks evolve after maksovites and mafic and carbonate tuff siltstones in the northwestern part of the deposit within a multiple ridge-like fold after brecciation zones. They differ from unaltered sedimentary rocks in heterogeneous (brecciated, streaky) textures, mineral and chemical composition and are saturated with numerous sulphide, carbonate, quartz and albite veinlets. They are identified by intense biotitization, chloritization and the presence of calcite, microcline metacrystals, albite-carbonate metacrystals with apatite and carbonate-quartz metacrystals with sulphides and rutile, veinlets and disseminated mineralization. Na concentration rises to 5.67% and K concentration to 7.57%. P and Ti concentrations, accompanying alkaline metasomatism, as well as Mg-Fe and ore-bearing components (often incompatible), increase locally. Metasomatic rocks evolve heterogeneously and are represented by breccia zones. Their slightly elevated radioactivity disturbs the qualitative characteristics of primary maksovite as a useful mineral. Maksovites were dated at 1558±61 Ma by the Re-Os method from sulphides.

scholarly journals Industrial Assessment of the Carbonate Rocks of the Pila Spi Formation at Haibat Sultan Mountain, Iraqi Kurdistan Region

2020 ◽  
Vol 8 (1) ◽  
pp. 24-30
Author(s):  
Varoujan K. Sissakian ◽  
Mohammed J. Hamawandy ◽  
Rahel K. Ibrahim
Keyword(s):  
Chemical Composition ◽  
Carbonate Rocks ◽  
Cement Industry ◽  
Constant Thickness ◽  
Dolomitic Limestone ◽  
Kurdistan Region ◽  
X Ray ◽  
Iraqi Kurdistan

The Pila Spi Formation is one of the prominent formations forming continuous ridges in Kurdistan Region. The thickness of the formation ranges from 15 to 110 m, consisting of well-bedded limestone, dolomite, dolomitic limestone, and very rare marl beds. The study area is located about 15 km east of Koya town, next to the abandoned tunnel through a deeply cut valley which has exposed 50 m of the formation. However, the uppermost part of the exposed section may belong to one of the Oligocene formations of Kirkuk Group. The study area was selected within the Pila Spi Formation because the rocks of the same formation and along the same ridge, about 45 km west of the study area showed encouraging results for cement industry. The average CaO is about 51%, whereas the average MgO is 1.8%. Therefore, eight samples were collected at constant thickness from the exposed section. The samples were subjected to X-ray fluorescence (XRF) test to indicate the main oxides in the sampled section. The acquired results from the XRF tests showed that the chemical composition of the exposed rocks within the Pila Spi Formation is suitable for cement industry, also for paper and paint but needs some treatment. Accordingly, another eight samples were collected from the same section to increase the density of sampling, totaling to 16 samples.

scholarly journals Prospects of Karelian carbonate deposits for the production of correcting additives to cement blend based on upper devonian marls from the russian platform

2019 ◽  
Author(s):  
Петр Фролов ◽  
Оксана Мясникова ◽  
Александр Савицкий
Keyword(s):  
Carbonate Rocks ◽  
Russian Platform ◽  
Upper Devonian ◽  
Carbonate Deposits

The possible use of carbonate rocks from some Karelian deposits for the production of correcting additives to raw cement blend from cement occurrences in the Leningrad and Novgorod districts (exemplified by the Babino occurrence) with insufficient standards for unaided exploitation are discussed.

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