ASEG Extended Abstracts最新文献_第5页

Shallow transient electromagnetic method application for groundwater exploration: case study from Greece 浅层瞬变电磁法在地下水勘探中的应用:以希腊为例

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073044

M. Sharlov, I. Buddo, Alexander Pisarnitskiy, N. Misurkeeva, I. Shelohov

引用次数: 3

Learnings from the Gawler Craton airborne survey quality control 高勒克拉通航空测量质量控制的启示

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073168

M. Hutchens

{"title":"Learnings from the Gawler Craton airborne survey quality control","authors":"M. Hutchens","doi":"10.1080/22020586.2019.12073168","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073168","url":null,"abstract":"Summary The Geological Survey of South Australia (GSSA) designed the Gawler Craton Airborne Survey (GCAS) to provide high resolution magnetic, gamma-ray and elevation data covering the northern portion of the Gawler Craton. In total, 1.66 million line km were planned over an area of 295,000 km2, covering approximately 30% of the state of South Australia. The survey design of 200 m spaced lines at a ground clearance of 60 m can be compared with the design of existing regional surveys which generally employed 400 m line spacing and a ground clearance of 80 m. The new survey design results in ~2 x the data coverage and ~25% closer to the ground when compared to previous standards for regional surveys in South Australia. Due to the enormous scale of the survey, the data were acquired using four contractors who employed ten systems to fly the sixteen blocks. To standardise the data from the multitude of systems, Geoscience Australia (GA) employed a comprehensive set of technical specifications. As part of these specifications the contractors were required to fly each of the ten systems over a series of test lines termed the “Whyalla Test Lines” (Whyalla). The final GCAS data provide truly impressive high resolution regional scale products. These will allow more detailed geological interpretation of the prospective Gawler Craton. A laser altimeter was added to the list of required survey equipment. Deficiencies in the technical specifications relating to laser altimeters were identified. Standards and procedures specific to laser characteristics will need to be considered on future surveys. Analyses show that weaknesses in current standards and procedures are still evident. The weaknesses identified allow room for improvements to be made for future surveys. Gamma-ray processing results raised the most serious concerns, with repeatability not achieved. Changes to standard procedures may need to be considered.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"2 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87684500","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

The sample boundary effect in the low-frequency measurements of the elastic moduli of rocks 岩石弹性模量低频测量中的试样边界效应

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073061

W. Tan, V. Mikhaltsevitch, M. Lebedev, S. Glubokovskikh, B. Gurevich

{"title":"The sample boundary effect in the low-frequency measurements of the elastic moduli of rocks","authors":"W. Tan, V. Mikhaltsevitch, M. Lebedev, S. Glubokovskikh, B. Gurevich","doi":"10.1080/22020586.2019.12073061","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073061","url":null,"abstract":"Summary In this study we examine the effect of the boundary conditions on the laboratory measurements of the elastic properties of a fluid-saturated sedimentary rock at low frequencies. In laboratory experiments associated with studying fluid effects on elastic properties of a porous rock sample, the tested sample cannot be completely sealed due to the presence of the fluid lines connected to its pore space. These lines form a pore-fluid storage which can affect the results of the elastic moduli measurements of fluid-saturated rocks. We developed a modified version of the Gassmann model which can estimate the bulk moduli of fully saturated rocks in dependence on the capacity of the pore-fluid storage. Here, we compare the predictions of the modified Gassmann model with the moduli measured on an n-decane-saturated limestone sample with the volume of the pore-fluid storage changing from 2 ml to 260 ml. The experimental results were obtained using a low-frequency apparatus based on the forced-oscillation method at a frequency of 0.1 Hz. We demonstrate that the predictions of the modified Gassmann model are in good agreement with the experimental data.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"7 1","pages":"1 - 3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87900734","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: 1

What you need to know to drill a high pressure, high temperature well 要钻一口高压高温井，你需要知道什么

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073057

J. Slade

引用次数: 1

Regional magnetotelluric and potential field data analyses related to mineral exploration of the Fennoscandian Shield, Sweden 瑞典芬诺斯坎地盾矿产勘探的区域大地电磁和势场数据分析

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073184

Roshanak Vadoodi, Thorkild M Rasmussen, Maxim Yu Smirnov

引用次数: 5

Application of passive seismic and AEM to 3D paleochannel imaging: Capricorn Orogen 被动地震和AEM在摩羯造山带古河道三维成像中的应用

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073067

S. Jakica, Lucy I. Brisbout

{"title":"Application of passive seismic and AEM to 3D paleochannel imaging: Capricorn Orogen","authors":"S. Jakica, Lucy I. Brisbout","doi":"10.1080/22020586.2019.12073067","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073067","url":null,"abstract":"Summary This study uses shallow passive seismic HVSR (horizontal-to-vertical spectral ratio) technique to determine the depth and extent of a Cenozoic paleochannel composed dominantly of sand and clay incised into the Proterozoic granitic basement of the Capricorn Orogen. The paleochannel contains sand-dominated intervals that host water that is presently being explored by Hastings Metals. There is some drilling data available but only a few drill cores intersect the basement. Improved understanding of the paleochannel geometry will assist with water exploration. The measured resonant frequency is related to shear wave velocity (Vs) and layer thickness. Passive seismic measurements at drill hole SWMB007 allow us to define a Vs for the regolith package overlying the basement. This Vs value is applied to 53 passive seismic measurements along Traverse 7 and the thickness of the paleochannel has been imaged in normalised H/V amplitude images. Along Traverse 7, HVSR data image a symmetrical paleochannel with a maximum depth of ~115 m. The geometry of the paleochannel imaged is broadly similar to the geometry obtained from 2.5D AEM inversion. However, the paleochannel has a greater maximum depth in AEM and some internal features of the paleochannel also differ.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"14 1","pages":"1 - 5"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84395183","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

The Foura Sandstone type section (Samaropollenites speciosus Zone, Carnian–early Norian; early Late Triassic), Timor-Leste: preliminary correlation between Timor and the Bonaparte Basin 富拉砂岩型剖面(卡尼—早诺世撒马洛花岗岩带);晚三叠世早期)，东帝汶与波拿巴盆地的初步对比

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073150

D. Peyrot, M. Keep, J. Scibiorski, E. McCartain, P. Baillie, J. Soares, D. Haig, A. Mory

引用次数: 6

Combining arrival classification and velocity model building using expectation-maximization 结合到达分类和速度模型建立使用期望最大化

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073105

Cericia Martinez, J. Gunning, Juerg Hauser

{"title":"Combining arrival classification and velocity model building using expectation-maximization","authors":"Cericia Martinez, J. Gunning, Juerg Hauser","doi":"10.1080/22020586.2019.12073105","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073105","url":null,"abstract":"Summary Probabilistic inversions of wide angle reflection and refraction data for crustal velocity models are regularly employed to understand the robustness of velocity models that can be inferred from these data. It is well understood that the uncertainties associated with the picks of individual arrivals contribute to overall model uncertainty. Typically only a modicum of effort is devoted to quantifying uncertainty in the traveltime picks; a constant noise estimate is commonly assigned to a given class of arrivals. Further, determining the class of arrivals is often left to the behest of the interpreter, contributing additional uncertainty to the data that is both difficult to quantify and may be altogether incorrect. Given the crucial role data uncertainty plays in characterising model robustness, there is a need to thoroughly and appropriately quantify uncertainty in the traveltime data which itself is inferred from the waveform. Here we propose a method that treats arrival or phase classification as part of the velocity model building (inversion) framework using the well-established expectation-maximization (EM) algorithm.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"26 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84823794","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

Statistical rock physics analysis and modelling in the Browse Basin Browse盆地统计岩石物理分析与建模

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072947

Shuich Desaki, Yuki Kobayashi, Peter Miklavs

引用次数: 0

Geophysics used to help find good quality groundwater in the Vientiane Plain, Lao PDR 地球物理学曾帮助在老挝人民民主共和国万象平原找到优质地下水

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073213

M. Hatch, O. Batelaan, E. Banks, S. Douangsavanh

{"title":"Geophysics used to help find good quality groundwater in the Vientiane Plain, Lao PDR","authors":"M. Hatch, O. Batelaan, E. Banks, S. Douangsavanh","doi":"10.1080/22020586.2019.12073213","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073213","url":null,"abstract":"Summary Lao PDR is a poorly developed country, with a large rural population which relies heavily on agricultural production. The Vientiane Plain is one of the most important and largest agricultural production areas with plans to expand the area under irrigated agriculture. Historically, surface water has been used because of its relative abundance with limited consideration to use groundwater. Where groundwater development has occurred for irrigation there is little or no management, and what little there is, is based on very poor hydrogeological information. A lack of knowledge of where to site wells has led to well failure and poor water quality. This project was initiated through the Society of Exploration Geophysics - Geoscientists without Borders Program to: teach local scientists, both university-based, as well as from the government, about the latest in hydrogeophysical technology and how it can be used in the Lao PDR. Specifically we looked to apply hydrogeophysical techniques to characterise the hydrogeology of the Vientiane Plain; to evaluate the quantity and quality of groundwater that may be available; and to enhance the scientific knowledge of local resource users. Two field trips were undertaken in 2018 and 2019 to conduct workshops and training with in-country government department officials and students from the Laos University. Results from the project identified and mapped highly conductive zones related to saline geological features which would be unsuitable locations for well locations for groundwater irrigation.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"47 1","pages":"1 - 3"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80855885","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