ASEG Extended Abstracts最新文献_第6页

Passive seismic HVSR surveying for groundwater exploration at the Chilalo Graphite Project, Tanzania 坦桑尼亚Chilalo石墨项目地下水勘探被动地震HVSR测量

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073155

Sharna Riley, J. Meyers, J. Sinnott

{"title":"Passive seismic HVSR surveying for groundwater exploration at the Chilalo Graphite Project, Tanzania","authors":"Sharna Riley, J. Meyers, J. Sinnott","doi":"10.1080/22020586.2019.12073155","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073155","url":null,"abstract":"Summary Passive seismic HVSR surveying is increasingly being used for investigating the thickness of soft sedimentary cover deposits sitting over hard and fresh bedrock, and for direct drill targeting of paleochannels for groundwater and brine resources. A detailed passive seismic HVSR survey was carried out at the Chilalo Graphite Project in SE Tanzania to assist with defining the thickness of alluvial deposits on the margins of the Mbewmburu River system. These alluvial sediments have the potential to host significant groundwater supply in paleochannels filled with porous coarse clastic material which can to be used for supporting a graphite ore processing. The HVSR data were acquired by local field operators, and then processed and depth converted using a Vs of 370m/s, with the modelled bedrock surface ranging in depth from <4m to 28m. The gridded bedrock depth highlighted two paleochannel features of variable depth within the river valley. One bore was drilled along the margin of a paleochannel and had encouraging water flow, and several water bores have planned to test the thick paleochannel deposits for groundwater potential. Drilling is ongoing at the time of writing and results are pending. The objective of this presentation is to demonstrate the successful application of the passive seismic HVSR method in assisting with hydrogeological studies by providing modelled bedrock surfaces which can be used for direct drill targeting, budgeting and volume estimations, and identifying potential aquiclude clay layers which could affect the hydraulic connectivity and recharge of the groundwater resource.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"42 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":"79212550","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: 2

Realtime analysis and well planning using wireline logs in a hydrogeological context 在水文地质背景下，利用电缆测井进行实时分析和井眼规划

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073102

B. Birt, O. Filiptsova, S. Ryan, Tim Hopper

{"title":"Realtime analysis and well planning using wireline logs in a hydrogeological context","authors":"B. Birt, O. Filiptsova, S. Ryan, Tim Hopper","doi":"10.1080/22020586.2019.12073102","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073102","url":null,"abstract":"Summary During the drilling process, numerous decisions must be made, often with limited information. In a known area prior knowledge often guides these decisions. In a recent drilling program in the Northern Perth Basin, as part of a research project to monitor the use of aquifers, petrophysical logs were used to help inform some critical decisions. Further analysis of the data collected from the borehole was going to be used to monitor quality, extent and connectivity of the numerous aquifers that make up the Northern Perth Basin. As an aquifer monitoring program, it is critical to ensure that the bore is accessing the aquifer in question. Therefore, accurate knowledge of depth and quality of formation is key. This paper shows how to use a simple set of petrophysical logs including natural gamma, resistivity and borehole magnetic resonance logs can be used to make informed decisions. For example, using a composite log, decisions were able to be made on screen placement prior to running, and also helped decide if extra bores on the same drilling pad were required. Finally, we were able to determine the salinity of ground water from wireline logs. The ability to make these decisions with accurate information not only ensures successful well completion but also maximises resource use.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"2019 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":"78958858","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

A practical approach used to plan and execute, quantify and qualify an effective well clean-up strategy 一种实用的方法，用于规划、执行、量化和验证有效的油井清理策略

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073122

R. Woods, T. Bothwell, B. Birt, Tim Hopper, S. Higginson

{"title":"A practical approach used to plan and execute, quantify and qualify an effective well clean-up strategy","authors":"R. Woods, T. Bothwell, B. Birt, Tim Hopper, S. Higginson","doi":"10.1080/22020586.2019.12073122","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073122","url":null,"abstract":"Summary Bringing a new well on-line is an expensive proposition and the need to ensure optimal performance is critical. Saturation and contamination of the drilling fluid with fines and subsequent invasion of the formation has historically resulted in hundreds of hours per well of invisible lost time during the clean-up phase of the well. New technologies, workflows and methods that can reduce costs/turnaround on projects were conducted on a large multi-well project in Perth, Western Australia, to maximise well efficiencies. Data from multiple sources were used to optimise and validate well clean-up operations with the aim to maximising production. This case study uses integration of well testing transient pressure data, Borehole Magnetic Resonance (BMR) derived transmissivity and flow logging to quantify success of clean-up/development of water wells, to reduce cost and optimise productivity. This case study demonstrates the successful implementation of an integrated approach to well clean-up using several scales of permeability data from core to wireline BMR to well test. This case study demonstrates that, in this particular setting, the use of the presented methodology was cost effective, yielded positive confirmation of asset delivery, and has led to a 90% reduction in clean-up associated time.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"7 6","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":"91441099","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

Revising the structural elements map of the North West Shelf 修订西北陆架构造要素图

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073107

C. Elders, T. Bernecker

{"title":"Revising the structural elements map of the North West Shelf","authors":"C. Elders, T. Bernecker","doi":"10.1080/22020586.2019.12073107","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073107","url":null,"abstract":"Summary The widely used scheme of naming basins and their regional subdivisions on the North West Shelf emerged from relatively sparse data collected during the early stages of exploration. Such data allow the recognition of large-scale structures and depocentres with a broadly distinct tectono-stratigraphic framework. While that scheme has endured, the availability of extensive, high quality seismic data and stratigraphic information from numerous exploration wells means that we can define much more precisely the structural elements that comprise the margin and the stratigraphic signatures of the basin fill. This has highlighted some inconsistencies in the existing nomenclature, the presence of structural elements of different ages and the presence of boundaries between basins that sometimes can appear rather arbitrary. We present a revised map for the North West Shelf that shows the structural elements with distinct tectono-stratigraphic signatures that comprise the margin, and applies a consistent nomenclature to them. The aim is to provide a framework that will allow for the better demarcation of distinct hydrocarbon provinces and improved targeting of exploration programmes. This is a work in progress and we invite you to annotate the map shown on our poster with your own comments or to provide feedback via our blog.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"1 1","pages":"1 - 2"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89744235","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

New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution 埃克斯茅斯次盆地的新认识:构造-地层演化

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073004

C. Dempsey, R. Benson, G. O’Halloran, O. Schenk, A. Karvelas, S. Tewari

引用次数: 4

Access to geological structures, density, minerals and textures through novel combination of 3D tomography, XRF and sample weight 通过3D层析成像、XRF和样品重量的新颖组合，获得地质结构、密度、矿物和纹理

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073146

M. Bergqvist, Eric Landström, Eric Landström, S. Luth

引用次数: 8

VMS and Ni-Cu exploration using an integrated geophysical and drilling method 地球物理与钻井相结合的VMS和Ni-Cu勘探

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073033

F. Effersø, E. Smart, R. Mortimer

{"title":"VMS and Ni-Cu exploration using an integrated geophysical and drilling method","authors":"F. Effersø, E. Smart, R. Mortimer","doi":"10.1080/22020586.2019.12073033","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073033","url":null,"abstract":"Summary This case study illustrates the use of an exploration method that leverages modern exploration techniques for deep-seated VMS and Ni-Cu deposits in a 978 km2 survey area in the highly prospective Areachap Belt, South Africa. The exploration method comprises the use of a high power helicopter TEM (“HTEM”) system, a large fixed loop TEM (“FLTEM”) ground system and drilling that are employed in a staged process to keep down risks and costs and more importantly to optimize the chances of discovering viable economic mineral resources. Based on the HTEM survey 19 high priority VMS targets were detected for ground follow up with FLTEM. The FLTEM data confirmed all of these targets, and 2D plate modelling refined the parameter for optimal drilling of the targets. The first result of the drilling campaign led to the discovery of a significant Ni-Cu deposit. The prospect of this case study is that the employed method may be useful for certain types of mineral exploration. Provided that the electrical conductivity contrast between the mineralisation and the host rock is sufficient then the use of HTEM and FLTEM is a viable choice. The staged exploration process ensures that potential resources are detected and that risks and costs at each step are kept down.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"1 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":"90188777","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

Using finite dipole lengths in complete earth 3D MT modelling 有限偶极子长度在全地球三维大地电磁学建模中的应用

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073129

W. Soyer, F. Miorelli, R. Mackie

{"title":"Using finite dipole lengths in complete earth 3D MT modelling","authors":"W. Soyer, F. Miorelli, R. Mackie","doi":"10.1080/22020586.2019.12073129","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073129","url":null,"abstract":"Summary We have quantified the use of finite electric dipole lengths from the point measurement assumptions typical in 3D MT inversion modeling. Electric fields are measured across dipoles of typically 50 m to 200 m at MT soundings. Modeling algorithms, however, normally use point electric field values at the surface of single cells to calculate MT transfer functions. This is perfectly reasonable for the majority of cases, but there are situations with strong shallow variability of resistivity, where measurements may not be simulated well by point electric fields, and detailed information might not be used optimally. We explore the consequences of this omission by quantifying the difference between point solutions and electric field integrations across dipoles in 3D forward calculations for selected cases. The topic ties closely with galvanic distortion and inversion for related parameters, lateral magnetic field variations, and the benefit of providing shallower constraints for the imaging of deeper targets. As a side product, the analysis led us to focus on the fields output from the 3D modeling, and we illustrate electric current systems through the cases analyzed. We observe that in the presence of strong topography and outcropping inhomogeneities, finite dipole solutions can differ considerably from point solutions, while over a variable regolith case the effect appears more contained","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"5 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":"85841965","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

Soil gases, pathfinders for exploration of buried sulphide deposits: insights from laboratory experiments 土壤气体，埋藏硫化物矿床勘探的探路者:来自实验室实验的见解

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073149

C. Plet, C. Siégel, R. Noble, R. Anand, M. Woltering, R. Thorne, A. Pagès, S. Spinks

{"title":"Soil gases, pathfinders for exploration of buried sulphide deposits: insights from laboratory experiments","authors":"C. Plet, C. Siégel, R. Noble, R. Anand, M. Woltering, R. Thorne, A. Pagès, S. Spinks","doi":"10.1080/22020586.2019.12073149","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073149","url":null,"abstract":"Summary The future of mineral resources in Australia relies on the discovery of deposits under sedimentary cover. Traditional surface geochemistry techniques are of limited use in this context, and alternative exploration tools such as the detection of soil gases are gaining increasing interest. Previous studies have highlighted the potential of soil gases, such as sulphur gases and soil gas hydrocarbons, for locating buried mineralisation. Here, we performed laboratory weathering experiments of sulphides under sterile and non-sterile conditions to gain insights into the origin of these gases. The experiments revealed that hydrocarbon gases could not be detected, suggesting they commonly originate from microbial ecosystems in the cover and/or in the soil. In addition, equilibrium thermodynamic predictions indicate a larger range of sulphur gases than detected, which suggests the experimental system did not reach thermal equilibrium. Our results also reveal that CS2 is the most abundant gas produced, and could be of particular interest as a pathfinder for mineral exploration through cover.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"31 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":"86035234","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

The mineral factory: how to build a giant quartz reef 矿物工厂:如何建造一个巨大的石英礁

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072994

Lisa R Tannock, M. Herwegh, A. Berger, K. Regenauer‐Lieb

引用次数: 1