The Leading Edge最新文献_第3页

Potential fields as a tool to characterize the inaccessible areas of the earth: The case of Pine Island–Ellsworth Mountains area, West Antarctica 电位场是描述地球上无法进入地区特征的工具：南极洲西部松树岛-埃尔斯沃思山脉地区案例

The Leading Edge Pub Date : 2024-04-01 DOI: 10.1190/tle43040218.1

Giuseppe Ferrara, Fausto Ferraccioli, Maurizio Fedi

{"title":"Potential fields as a tool to characterize the inaccessible areas of the earth: The case of Pine Island–Ellsworth Mountains area, West Antarctica","authors":"Giuseppe Ferrara, Fausto Ferraccioli, Maurizio Fedi","doi":"10.1190/tle43040218.1","DOIUrl":"https://doi.org/10.1190/tle43040218.1","url":null,"abstract":"We seek to characterize the geophysical properties of the West Antarctic Rift System. While it is recognized as one of the largest rift systems on the earth, the West Antarctic Rift System is poorly understood as it is covered by the thick West Antarctic Ice Sheet, making any geologic evaluation difficult. We used the potential-field data sets acquired by the British Antarctic Survey, which included aeromagnetic surveys, to conduct a multiscale analysis to identify the main structural lineaments, i.e., contacts, dikes, sills, volcanic necks and conduits, and spherical source distributions. Several interesting areas were defined in which contact-type sources were associated with faults bordering major rift systems (Pine Island, Byrd Subglacial Basin, and Bentley Subglacial Trench) or related to the tributaries in the Pine Island Rift. Moreover, we detected magmatic sources close to rifting zones based on their shape and orientation (Bentley Subglacial Basin edges), helping to define the depth of the sub-ice topography. Our results helped improve our knowledge of the structural regional geology of the West Antarctic Rift System. This work opens interesting scenarios about the extent and position of magmatic sources and how they contribute to the topography of this sector of the West Antarctic Rift System.","PeriodicalId":507626,"journal":{"name":"The Leading Edge","volume":"714 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140776847","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}

引用次数: 0

Spectrometric borehole logging in mineral exploration and mining 矿物勘探和采矿中的光谱钻孔测井

The Leading Edge Pub Date : 2024-04-01 DOI: 10.1190/tle43040246.1

Manuel Queißer, Matthew Tudor, Jens Schubert, Alexander R. Domula, Horst Märten, Thomas Heinig, Tobias Rothe, Alfred Stadtschnitzer

{"title":"Spectrometric borehole logging in mineral exploration and mining","authors":"Manuel Queißer, Matthew Tudor, Jens Schubert, Alexander R. Domula, Horst Märten, Thomas Heinig, Tobias Rothe, Alfred Stadtschnitzer","doi":"10.1190/tle43040246.1","DOIUrl":"https://doi.org/10.1190/tle43040246.1","url":null,"abstract":"Borehole logging tools based on pulsed neutron technology are used to infer geophysical parameters such as bulk density. If fitted with a gamma-ray spectrometer, they may also measure elemental mass fractions of a variety of formation elements. Spectrometric borehole logging tools of this kind are established in the oil and gas industry. With the demand for mineral resources surging, cost- and time-efficient measurement techniques are increasingly needed in mineral exploration. Their ability to detect multiple elements that are building blocks of minerals makes spectrometric borehole logging tools popular in mineral exploration and mining grade control. In this article, the potential of the OreLog pulsed neutron gamma spectrometric downhole logging tool is demonstrated at Erzberg Mountain (Styria, Austria). Erzberg hosts the largest known siderite deposit in the world, and open-pit mining is used to extract iron ore. The aim was to obtain a more detailed and faster geochemical characterization of iron ore deposits prior to blasting. Elemental logs were acquired with highest accuracies for Fe, Ca, and Mn, followed by Si, Mg, K, and S. The tool mapped a 2D cross section of formation element concentration within a few hours, which agrees with orogenetic fault and geologic contact lines. Mineralogical information retrieved from elemental logs confirmed the interlaced mineralogy of the site. It is dominated by a carbonate body, hosting an intergrowth of Mg-rich siderite (sideroplesite) and a solid solution of dolomite/ankerite/kutnohorite. In addition to the tool's potential for enhanced real-time mining control, the benefit of continuous depth-resolved elemental logs is seen in the possibility to deduce a more refined and reliable geochemical and mineralogical model of the deposit. The information-rich data stream opens applications beyond grade control and exploration, such as data assimilation with gravity models or geologic model building.","PeriodicalId":507626,"journal":{"name":"The Leading Edge","volume":"27 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140762764","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}

引用次数: 0

Analytic continuation: A tool for aeromagnetic data interpretation 分析延续：航空磁数据解读工具

The Leading Edge Pub Date : 2024-04-01 DOI: 10.1190/tle43040228.1

Jeffrey B. Thurston, B. Fornberg

{"title":"Analytic continuation: A tool for aeromagnetic data interpretation","authors":"Jeffrey B. Thurston, B. Fornberg","doi":"10.1190/tle43040228.1","DOIUrl":"https://doi.org/10.1190/tle43040228.1","url":null,"abstract":"Extending potential-field data to vertical complex-plane slices provides opportunities, unique to analytic functions, for subsurface imaging. We begin with an existing numerical method for differentiation by integration using Cauchy's integral formula. An example from data over northern Ontario, Canada, illustrates better conditioning compared to derivatives computed using finite differences. Next, these quantities are used for analytic continuation using rational complex-series expansion (Padé approximation). This method provides stable downward continuation to distances that are significantly greater than are achievable by Taylor series and spectral methods. A synthetic test confirms that the rational approximant faithfully reproduces the magnetic response of a thin sheet. A sign reversal of the total field, coincident with the origin of the sheet, features prominently on this example. We also provide synthetic results for sheets with finite depth extent, point sources, thin slabs, and contacts. These also exhibit polarity flips near the source location. Further, these provide a template for interpreting the source geometry using the shape of the approximating function. Additional synthetic tests illustrate an automatic method for locating closely spaced random assemblages of isolated poles. We apply our methods to a deposit-scale heliborne survey over a recently discovered volcanogenic massive sulphide ore deposit in a Canadian greenstone belt. The analytically continued profile over the deposit suggests the presence of a subvertical thin sheet of unknown depth extent. This interpretation coincides with a sulphide ore body that has been previously delimited by several drill holes. Some known prospects near this deposit are also imaged on maps and profiles of the Padé approximant.","PeriodicalId":507626,"journal":{"name":"The Leading Edge","volume":"40 38","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771712","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}

引用次数: 0

Seismic Soundoff: The untapped potential of the earth's hidden commons 地震之声：地球隐藏公域的未开发潜力

The Leading Edge Pub Date : 2024-04-01 DOI: 10.1190/tle43040264.1

Andrew Geary

引用次数: 0

Introduction to this special section: Gravity, electrical, and magnetic methods 本专题介绍：重力法、电法和磁法

The Leading Edge Pub Date : 2024-04-01 DOI: 10.1190/tle43040208.1

Irina Filina, Maurizio Fedi, Jiajia Sun, Alan Morgan

{"title":"Introduction to this special section: Gravity, electrical, and magnetic methods","authors":"Irina Filina, Maurizio Fedi, Jiajia Sun, Alan Morgan","doi":"10.1190/tle43040208.1","DOIUrl":"https://doi.org/10.1190/tle43040208.1","url":null,"abstract":"Geophysics plays an important role in all aspects of geologic analysis, spanning from regional exploration and tectonic mapping to local prospect-level studies and energy transition projects. Out of a variety of geophysical techniques, seismic methods often play the most central role, while less expensive nonseismic methods are less frequently applied. One of the objectives of SEG's Gravity and Magnetics Committee is to promote nonseismic geophysical methods and showcase their value in various geologic applications. As members of that committee, we, the editors of this special section, assert that gravity, magnetic, and electrical methodologies are powerful yet often undervalued tools. We present this special section focused on nonseismic geophysical methods and the impact they can make on various geoscience projects. Included here are a regional tectonic study in Antarctica, a local mining exploration mapping project in Canada, and an analytical methodology capable of providing critical information about subsurface geology and helping to determine the depths of important geologic structures. Although our scope is to provide a broader discussion of different types of nonseismic techniques, all of the papers presented in this special section focus on magnetic surveying.","PeriodicalId":507626,"journal":{"name":"The Leading Edge","volume":"402 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140778618","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}

引用次数: 0

Delineating subbasins of sedimentary rock structure beneath eastern Central Sumatra Basin based on gravity model, seismic profiles, and well-log data: A case study 根据重力模型、地震剖面和井记录数据划分苏门答腊盆地中部东部沉积岩结构子盆地：案例研究

The Leading Edge Pub Date : 2024-03-01 DOI: 10.1190/tle43030176.1

T. B. Nainggolan, D. Kusnida, Eddy Mirnanda, I. Setiadi, Erwin Haryanto Nugroho, Subagio

{"title":"Delineating subbasins of sedimentary rock structure beneath eastern Central Sumatra Basin based on gravity model, seismic profiles, and well-log data: A case study","authors":"T. B. Nainggolan, D. Kusnida, Eddy Mirnanda, I. Setiadi, Erwin Haryanto Nugroho, Subagio","doi":"10.1190/tle43030176.1","DOIUrl":"https://doi.org/10.1190/tle43030176.1","url":null,"abstract":"The Central Sumatra Basin is a vast sedimentary basin that has been proven to produce hydrocarbon. The basin comprises several subbasins that are not sufficiently imaged by conventional seismic reflection profiles and limited well-log data, particularly in the nearshore area to the east. This research aims to delineate sedimentary subbasins, interpret the subsurface geologic model, and identify geologic structures beneath the eastern part of the Central Sumatra Basin using integrated geophysical gravity, seismic profiles, and well-log data. Three-dimensional gravity inversion modeling results indicate that the pre-Tertiary granitic basement is a continental crust with a mass density value of 2.67 gr/cc. The modeling results indicate that the sedimentary rock is composed of Early Oligocene–Middle Miocene sedimentary rock, with a mass density of 2.35 gr/cc, arranged from bottom to top. The residual gravity anomaly model identifies 13 sedimentary subbasins with structural features such as basement height, graben, and fault mapped in a relatively northwest–southeast direction. Moreover, based on the graben pattern and the basement high beneath the eastern Central Sumatra Basin, many structural patterns support the development of petroleum systems similar to that of the western part of the basin, which has already produced hydrocarbon. Our research also revealed the thickness of the Sihapas Formation in the eastern part of the basin, which shows great potential as a hydrocarbon reservoir. The results show that integrated analysis of many geophysical data sets can substantially decrease the uncertainty associated with individual data sets and produce more reliable imaging of subsurface geology.","PeriodicalId":507626,"journal":{"name":"The Leading Edge","volume":"113 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090913","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}

引用次数: 0

Geoscientists Around the Globe 全球地球科学家

The Leading Edge Pub Date : 2024-03-01 DOI: 10.1190/tle43030195.1

引用次数: 0

Editorial Calendar 编辑日历

The Leading Edge Pub Date : 2024-03-01 DOI: 10.1190/tle43030141.1

引用次数: 0

Introduction to this special section: Imaging faults and fractures 本专题介绍：断层和裂缝成像

The Leading Edge Pub Date : 2024-03-01 DOI: 10.1190/tle43030144.1

Molly Turko, Elizabeth Horne, Heather Bedle

引用次数: 0

Seismic Soundoff: Thinking like an algorithm: Utilizing machine learning in seismic data Seismic Soundoff：像算法一样思考：在地震数据中利用机器学习