Pub Date : 2023-10-01DOI: 10.1016/j.rines.2023.100007
Subodh Verma , Arindam Das , Sachin R. , Tapan Pal
The Andaman and Nicobar Group of Islands represent a topographic high of forearc sediments in an actively rising accretionary prism on the Andaman subduction margin. Preliminary observations of deformation structures recorded in tuff are reported from Great Nicobar Island. Active compression led to the formation of meso-scale deformation structures such as a schuppen zone with horse units; sole and roof thrusts; fault breccia zone; high angle reverse faults and pop-up structures. Offset of tuff beds up to a few centimetres are observed across these faults.
{"title":"Preliminary appraisal of deformation structures from Great Nicobar Island, Andaman-Sumatra arc system","authors":"Subodh Verma , Arindam Das , Sachin R. , Tapan Pal","doi":"10.1016/j.rines.2023.100007","DOIUrl":"https://doi.org/10.1016/j.rines.2023.100007","url":null,"abstract":"<div><p>The Andaman and Nicobar Group of Islands represent a topographic high of forearc sediments in an actively rising accretionary prism on the Andaman subduction margin. Preliminary observations of deformation structures recorded in tuff are reported from Great Nicobar Island. Active compression led to the formation of meso-scale deformation structures such as a schuppen zone with horse units; sole and roof thrusts; fault breccia zone; high angle reverse faults and pop-up structures. Offset of tuff beds up to a few centimetres are observed across these faults.</p></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"1 ","pages":"Article 100007"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2211714823000079/pdfft?md5=8ee6dea9d52297bce5219bc8a10789f6&pid=1-s2.0-S2211714823000079-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92136242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1016/j.rines.2023.100004
Željka Fiket , Gordana Medunić
This paper presents a comprehensive data set on rare earth elements (REE) and their distribution in soils and vegetables in an area where the soil background is enriched with these elements. The study examined REE distribution in six vegetables commonly grown in local residents' gardens, including fennel, garlic, lettuce, parsley, onion, and raddichio, and each plant was analyzed for REE composition in its root, stem, and leaf or bulb. In addition to total REE concentrations in soils and plants, the data set includes transfer factors and fractionation indices for REE in soils, as well as normalized curves. This dataset may be useful in the field of soil geochemistry and research on the uptake of lanthanides into plants and the food chain, as well as their potential effects on human health.
{"title":"Dataset of rare earth elements distribution in soils and vegetables","authors":"Željka Fiket , Gordana Medunić","doi":"10.1016/j.rines.2023.100004","DOIUrl":"https://doi.org/10.1016/j.rines.2023.100004","url":null,"abstract":"<div><p>This paper presents a comprehensive data set on rare earth elements (REE) and their distribution in soils and vegetables in an area where the soil background is enriched with these elements. The study examined REE distribution in six vegetables commonly grown in local residents' gardens, including fennel, garlic, lettuce, parsley, onion, and raddichio, and each plant was analyzed for REE composition in its root, stem, and leaf or bulb. In addition to total REE concentrations in soils and plants, the data set includes transfer factors and fractionation indices for REE in soils, as well as normalized curves. This dataset may be useful in the field of soil geochemistry and research on the uptake of lanthanides into plants and the food chain, as well as their potential effects on human health.</p></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"1 ","pages":"Article 100004"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50191335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sustaining wellbore stability in depleted reservoirs is a crucial concern. With production from hydrocarbon reservoirs, the reservoir's pore pressure is reduced over time, and the reservoir is depleted since field development is one of the main purposes for oil companies. Heavy mud weight in depleted reservoir caused fracture due to reduced fracture gradient, and low mud weight caused blow out in high-pressure zone or well collapse due to shale beds that required high mud weight to prevent collapse. Considering geomechanics and coupled equilibrium equation, continuity equation, Hook’s law, compatibility equation, Darcy’s law, and thermal relation, the Thermo-poro-elastic equation was derived in this research. A finite element method has been designed to execute the fully coupled thermo-poro-elastic non-linear models. The finite element model was validated by analogizing it to the available analytical solutions for the thermo-poro-elastic wellbore troubles in shale. The non-linear thermal-poro-elasticity finite element model was used to analyze wellbore stability in a depleted limestone reservoir during drilling. The numerical results showed that a decrease drilling fluid’s temperature (cooling) causes to increase in the potential for tensile failure and reduces the potential of shear failure. Due to the depletion reservoir, the potential of tensile failure increased than shear failure, so heating the drilling fluid could cause wellbore stability in the depleted reservoir. Furthermore, based on the numerical results, it may be supposed that the drilling fluid’s temperature is one of the essential elements in the wellbore stability analysis in depleted reservoirs.
{"title":"Wellbore stability in a depleted reservoir by finite element analysis of coupled thermo-poro-elastic units in an oilfield, SW Iran","authors":"Alireza Pirhadi , Pooria Kianoush , Arash Ebrahimabadi , Reza Shirinabadi","doi":"10.1016/j.rines.2023.100005","DOIUrl":"https://doi.org/10.1016/j.rines.2023.100005","url":null,"abstract":"<div><p>Sustaining wellbore stability in depleted reservoirs is a crucial concern. With production from hydrocarbon reservoirs, the reservoir's pore pressure is reduced over time, and the reservoir is depleted since field development is one of the main purposes for oil companies. Heavy mud weight in depleted reservoir caused fracture due to reduced fracture gradient, and low mud weight caused blow out in high-pressure zone or well collapse due to shale beds that required high mud weight to prevent collapse. Considering geomechanics and coupled equilibrium equation, continuity equation, Hook’s law, compatibility equation, Darcy’s law, and thermal relation, the Thermo-poro-elastic equation was derived in this research. A finite element method has been designed to execute the fully coupled thermo-poro-elastic non-linear models. The finite element model was validated by analogizing it to the available analytical solutions for the thermo-poro-elastic wellbore troubles in shale. The non-linear thermal-poro-elasticity finite element model was used to analyze wellbore stability in a depleted limestone reservoir during drilling. The numerical results showed that a decrease drilling fluid’s temperature (cooling) causes to increase in the potential for tensile failure and reduces the potential of shear failure. Due to the depletion reservoir, the potential of tensile failure increased than shear failure, so heating the drilling fluid could cause wellbore stability in the depleted reservoir. Furthermore, based on the numerical results, it may be supposed that the drilling fluid’s temperature is one of the essential elements in the wellbore stability analysis in depleted reservoirs.</p></div>","PeriodicalId":101084,"journal":{"name":"Results in Earth Sciences","volume":"1 ","pages":"Article 100005"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2211714823000055/pdfft?md5=bd8883b1144aaaff85d7a6e1a0a8c462&pid=1-s2.0-S2211714823000055-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92046596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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