Exploration Geophysics最新文献

{"title":"Well log evaluation of the gas-bearing reservoirs in the Bombay offshore basin, Gulf of Cambay, western coast of India","authors":"Sikha Rani Mondal, Ranjana Ghosh, Maheswar Ojha, Saumen Maiti","doi":"10.1080/08123985.2023.2288958","DOIUrl":"https://doi.org/10.1080/08123985.2023.2288958","url":null,"abstract":"Present study aims to locate potential reservoir zones in the Paleocene, Eocene and Oligocene sequences by analysing well log data of nine vertical wells in the exploration block MB-OSN-2004/1 in t...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"7 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138685701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic data interpolation via Unet with non-local blocks","authors":"Jiajia Cao, Lihua Fu, Wenqian Fang, Mengyi Wu","doi":"10.1080/08123985.2023.2290134","DOIUrl":"https://doi.org/10.1080/08123985.2023.2290134","url":null,"abstract":"Due to the constraints of the exploration environment, acquired seismic data are commonly irregular or incomplete, which seriously affects the quality of subsequent seismic data processing and inte...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"58 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138572736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on various factors contributing to poor microtremor data processing results using ESAC method","authors":"Shuangcheng Ge, Gaoxiang Chen, Yonghui Zhao, Shufan Hu","doi":"10.1080/08123985.2023.2281618","DOIUrl":"https://doi.org/10.1080/08123985.2023.2281618","url":null,"abstract":"In practical applications, microtremor data often encounter contamination from various sources of noise, leading to suboptimal processing outcomes. This study aimed to provide a comprehensive analy...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"273 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative measurement of the environmental disturbance caused by onshore seismic surveys","authors":"Tim Dean","doi":"10.1080/08123985.2023.2279995","DOIUrl":"https://doi.org/10.1080/08123985.2023.2279995","url":null,"abstract":"Environmental impact assessments are a key component of the approval process for many onshore seismic surveys. Quantifying the environmental disturbance caused by such surveys is, however, problema...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"6 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative 3D inversion of magnetotelluric phase tensors and impedances reveals electrically anisotropic base of Gawler Craton, South Australia","authors":"Kristina Tietze, Stephan Thiel, Kate Brand, Graham Heinson","doi":"10.1080/08123985.2023.2281615","DOIUrl":"https://doi.org/10.1080/08123985.2023.2281615","url":null,"abstract":"Isotropic three-dimensional (3-D) inversion has become a standard tool in the interpretation of magnetotelluric (MT) data. 3-D anisotropic inversion codes are under development, yet the number of u...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"7 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metasomatism and depletion of the southern Gawler Craton from combined mantle xenocryst and AusLAMP magnetotelluric data","authors":"Kate Selway, Sinan Özaydın, Justin Payne","doi":"10.1080/08123985.2023.2282711","DOIUrl":"https://doi.org/10.1080/08123985.2023.2282711","url":null,"abstract":"Metasomatised mantle is considered a prerequisite for the formation of many major ore deposits. Since magnetotellurics (MT) is strongly sensitive to mantle metasomatism, MT is a useful tool for ana...","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"94 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AusLAMP shines a light on space weather hazards in the Australian high-voltage power grid","authors":"Liejun Wang, Jingming Duan, Adrian P. Hitchman, Matthew G. Gard, Richard A. Marshall, Andrew M. Lewis, William V. Jones","doi":"10.1080/08123985.2023.2281617","DOIUrl":"https://doi.org/10.1080/08123985.2023.2281617","url":null,"abstract":"AbstractA geomagnetic storm, also known as a geomagnetic disturbance (GMD), is a major disturbance of the Earth’s magnetic field caused by solar activity. A geomagnetic storm induces electric currents in the Earth that feed into power lines through substation neutral earthing, causing instabilities and even blackouts in electricity transmission systems. The intensity of geomagnetically induced currents (GICs) is closely associated with the electrical conductivity of the surrounding geology. In this paper, we analyse one of the most well-known geomagnetic storms, the 1989 “Québec storm” and 688 magnetotelluric (MT) survey sites from the Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) to gain insight into the space weather hazard posed for Australia's modern-day power grids. Transmission lines may exhibit local maxima at differing times depending on their spatial orientation and length with respect to the time-varying magnetic field. Localised peak voltages over 100 V can be observed on some individual lines. This assessment identifies the distribution of GICs in south-eastern Australia for the 1989 Québec storm and transmission lines that are more vulnerable to GICs. It is relevant to national strategies and risk assessment procedures to mitigate space weather hazards in the Australian high-voltage power grid and the design of a more resilient power transmission system. We also analyse the 2015 “St Patrick’s Day storm” to study under-estimation of the space weather hazard associated with the band-limited geomagnetic data and MT data sets.Key points The subsurface geology has a great influence on the intensity of geomagnetically induced electric fields, potentially causing up to three orders of magnitude difference between conductive basins and resistive cratonic regions in south-eastern Australia.Analysis using the 1989 “Québec geomagnetic storm” and AusLAMP magnetotelluric data shows the intensity of the geoelectric fields in south-eastern Australia could reach up to 5 [V/km].Geomagnetically induced voltages in the Australian high-voltage power grid could be in excess of 100 V in some transmission lines for a geomagnetic storm with intensity comparable with the 1989 Québec geomagnetic storm.KEYWORDS: Space weather hazardgeomagnetically induced currentshigh-voltage power gridgeomagnetic storms AcknowledgementsThe authors thank Geoscience Australia, the Geological Surveys of Victoria, South Australia, and New South Wales, the University of Adelaide and AuScope for making their MT datasets available for investigation.The geomagnetic field data can be downloaded from the Geoscience Australia Geomagnetism Program (http://www.ga.gov.au).The SECS-MT Python code of Campanyà et al. (Citation2019) has been used for computation of geoelectric field time series. The software of Wessel and Smith (Citation1998) has been used to produce some figures in this paper.We thank Dr Kate Brand, an anonymous reviewer, and editor Dr Mark Lackie for","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"67 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134901593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of geothermal resources using a geophysical potential field in the Hurghada area, Egypt","authors":"Samah Elbarbary, Mohamed Abdel Zaher, Hossam Marzouk, Tarek Arafa-Hamed","doi":"10.1080/08123985.2023.2276403","DOIUrl":"https://doi.org/10.1080/08123985.2023.2276403","url":null,"abstract":"AbstractEgypt's need for clean and renewable energy is pressing for numerous reasons, such as unpredictable fuel prices, diminishing fossil fuel resources, and growing concern about environmental degradation. Harvesting untapped geothermal resources could meet domestic electricity needs besides enabling Egypt to export electricity. The location of Egypt confirms that it has suitable geothermal energy potential areas in some provinces around the country, especially along the Gulf of Suez, the Red Sea, and the Western Desert. The Red Sea coast and the coasts of the Gulf of Suez exhibit several surface manifestations (hot springs and thermal water wells), indicating the presence of geothermal systems in these areas. The objective of this paper is to investigate the geothermal resources and obtain a full image of the geothermal potential of the Hurghada area along the Red Sea coast using geophysical potential field data. Aeromagnetic and aerogravity data were used to identify the most promising target regions for geothermal potentiality. Power spectral analysis of the aeromagnetic data was utilised to appraise the Curie point depth (CPD) and obtain geothermal gradient and heat flow maps of the Hurghada area, whereas a 3-D inversion of gravity data was utilised to estimate the depths to the Precambrian basement rocks. In addition to 3-D inversion of magnetic data to evaluate the spatial distribution of magnetic susceptibility. This study found no direct relationship between basement depths and the CPD, where basement rock outcrops at some locations correlate to a decrease in the Curie surface, while at others, they correspond to an increase.KEYWORDS: aeromagneticaerogravityCurie point depthheat flowPrecambrian basement Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was mainly funded by the Science and Technology Development Fund (STDF) in Egypt via a Development & Innovation Grant titled “A Prospective Study of the Geothermal Potential in Egypt.” (Project ID: 43553).","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The resistive limit response of an ellipsoidal conductor: a magnetostatic formulation","authors":"Peter K. Fullagar","doi":"10.1080/08123985.2023.2275804","DOIUrl":"https://doi.org/10.1080/08123985.2023.2275804","url":null,"abstract":"AbstractInterpreting transient electromagnetic (TEM) anomalies in terms of conductive rectangular plates is effective in many situations. However, not all conductors are thin and planar. Triaxial ellipsoid conductors are an attractive alternative: geometrically simple (corner-free), mathematically tractable at early and late time limits, and able to encompass shapes ranging from discs to elongate lenses to equi-dimensional pods. Accordingly a fast magnetostatic algorithm has been developed to compute the resistive limit (RL) response of a ellipsoidal conductor, which may also be permeable. The algorithm has been validated against new analytic resistive limit solutions for spherical and spheroidal conductors and against 3D multigrid finite difference modelling for a triaxial ellipsoidal conductor. A uniformly conductive ellipsoid supports three fundamental current modes in the resistive limit, an independent mode for excitation parallel to each of the principal axes. The RL current density increases linearly with radial distance from the ellipsoid centre. A formula for the time constant of an oblate spheroid has been derived for excitation parallel to its rotational axis, namely τ3≈σμ0bc/(4+6c/b), where σ is the conductivity and c and b are respectively the minor and major radii.KEYWORDS: Ellipsoidresistive limitelectromagneticsmodelling AcknowledgementsI am indebted to the late Dr. Yves Lamontagne (Lamontagne Geophysics) who kindly modelled triaxial ellipsoid RL responses using his MGEM 3D multigrid finite difference program and who provided physical insights. Dr. David Clark (CSIRO/Integrated Magnetics LLC) assisted with theoretical aspects, and in particular confirmed my derivation of equation (22) for the RL field inside a spherical conductor.Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"76 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Remote sensing campaign at the Roman Villa of Caddeddi on the Tellaro river (Noto, Italy)","authors":"D. Tanasi, R. Lanteri, S. Hassam, P. Trapani, D. Calderone, K. Kingsland, L. De Giorgi, I. Ferrari, G. Fragalá, F. Giuri, G. Leucci","doi":"10.1080/08123985.2023.2266446","DOIUrl":"https://doi.org/10.1080/08123985.2023.2266446","url":null,"abstract":"AbstractThe Villa of Caddeddi, in the territory of Noto (Siracusa) is located on the south bank of the Tellaro river, about 3 km from its mouth. The site, interpreted as a rural luxury residence dated to the fourth–fifth century CE, was first discovered in 1972 and intermittently investigated in the subsequent decades and mostly studied from the perspectives of the splendid mosaic floors there uncovered. The excavated structure accounts for just a portion of the complex, which is partially covered by an eighteenth–nineteenth century farmhouse. After a long period of neglect, the villa, mainly known in literature for its exquisite mosaic floors, has been recently restored and opened to the public and become subject of new studies by the University of South Florida’s Institute for Digital Exploration (IDEx) and the Institute of Heritage Science – CNR which between 2019 and 2022 conducted a remote sensing, using ground penetrating radar method, campaign in partnership with the Parco Archeologico e Paesaggistico di Siracusa, Eloro, Villa del Tellaro e Akrai. The results related to the digital exploration and ground penetrating radar allow new knowledge relating to the Roman villa and allows a scientific reconstruction of the villa.KEYWORDS: Roman Sicilyground penetrating radargeophysical surveyRoman Villa Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":50460,"journal":{"name":"Exploration Geophysics","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136210876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}