ASEG Extended Abstracts最新文献_第3页

Legacy data – hidden opportunity 遗留数据-隐藏的机会

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073241

K. Reeves

引用次数: 0

Lithology characterisation of the roof and floor of the Moranbah measures coal seam using post-stack and pre-stack seismic inversion 利用叠后和叠前地震反演技术对莫兰巴煤层顶板进行岩性表征

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072990

M. Pavlova

{"title":"Lithology characterisation of the roof and floor of the Moranbah measures coal seam using post-stack and pre-stack seismic inversion","authors":"M. Pavlova","doi":"10.1080/22020586.2019.12072990","DOIUrl":"https://doi.org/10.1080/22020586.2019.12072990","url":null,"abstract":"Summary 3D seismic technology has become a popular exploration and development tool among coal mining companies in Australia in the last ten years. Traditionally the main use of these seismic data is to inform the mine of the structural features such as faults, rolls and dykes. There have been very few attempts to use quantitative seismic interpretation to help understand geological risks ahead of longwall mining. The purpose of this paper is to provide an example of roof and floor characterisation using post-stack and prestack seismic inversion. First step in the study was to understand the relationship between elastic and rock properties using log data. Thus, when looking at the relationship between lithology/gamma ray response and compressional impedance I observed that massive, blocky sandstones have high velocity and density and hence high compressional impedance, while siltstones, claystones and fine-grained sands have low density, velocity and low compressional impedance. Lithology discriminators lambda-rho and mu-rho crossplots also showed good separation of blocky clean, sands and soft fine-grained sands. As a second step I ran pre-stack and post-stack inversions using a small subset of the boreholes. Thirdly, upon reviewing products of the inversions against all log data, I found the pre-stack results to be more superior than the post-stack. The current work highlighted a few areas of blocky sandstone roof and weak floor. This information could be used to inform the future mine operations and design.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84307089","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

From a Mining Mindset to Regional Discovery: A Case Study for Hematite Iron Ore Exploration in Mauritania 从采矿思维到区域发现:以毛里塔尼亚赤铁矿勘探为例

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073145

B. Waele, A. Aitken, M. V. Mourik, Khalifa Oul Laab Laab, Mohamed Elhacen Ould Med Yeslem, Thiam Mohamedou

引用次数: 2

A geological pressure model for the Browse Basin and the southern Vulcan Sub-Basin, NWS Australia 澳大利亚西北部Browse盆地和Vulcan南部次盆地的地质压力模型

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072925

J. Heller, Toh Shi-Yuan, A. Edwards

{"title":"A geological pressure model for the Browse Basin and the southern Vulcan Sub-Basin, NWS Australia","authors":"J. Heller, Toh Shi-Yuan, A. Edwards","doi":"10.1080/22020586.2019.12072925","DOIUrl":"https://doi.org/10.1080/22020586.2019.12072925","url":null,"abstract":"Summary The results presented in this paper draws on a regional pressure analysis of the offshore areas of the Browse Basin and the southern Vulcan Sub-Basin. The presented study focuses on Late Permian to Recent stratigraphy and a new stratigraphic scheme consisting of 11 main sequences has been developed as part of the study. Vp-Rho cross plot analysis conducted for wells in the study area, indicates that undercompaction (disequilibrium compaction) is the main overpressure generating mechanism present. Although no clear deviation from a normal compaction/disequilibrium compaction trend is evident in the analysed wells, densities can be very high at depth with densities up to 2.65 g/cm3 and above. This indicates that some cementation and possible clay mineral transformations have taken place in the deeper (and older) shales posing a challenge to conventional porosity/effective stress related pore pressure prediction. For the purpose of this study, a model describing (shale) overpressures due to “primary” and “secondary” disequilibrium has been developed. The developed geological pressure model shows an overall good match with shale pressure predictions and/or forms the upper bound of the observed shale pressure/drilling data for the majority of the analysed wells across the study area. The model is particularly useful when planning to drill in areas with few offset wells for calibration and may also form a supplement to pore pressure predictions from seismic velocities away from well control and thereby significantly reduces the risk of encountering unexpected high pressures.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80333017","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

Co-operative inversion of geoelectrical data sets acquired from different electrode arrays 不同电极阵列地电数据集的协同反演

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073100

D. T. Kieu, T. Truong

引用次数: 1

Quaternary buried valley characterization on the Canadian Prairies using a shear land-streamer 加拿大大草原第四纪隐伏谷的剪切地貌特征

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072977

David G. Schieck, R. Hearst

{"title":"Quaternary buried valley characterization on the Canadian Prairies using a shear land-streamer","authors":"David G. Schieck, R. Hearst","doi":"10.1080/22020586.2019.12072977","DOIUrl":"https://doi.org/10.1080/22020586.2019.12072977","url":null,"abstract":"Summary A 72 channel 3-component land-streamer in conjunction with an IVI Envirovibe modified with a transverse shearpack has been constructed and tested over a known >70 m Quaternary buried valley system SE of Calgary, Alberta. Recent near surface seismic reflection developments using a land-streamer have been commercialized in the Western Canadian Prairies repurposing former exploration seismic equipment. Shear-shear reflection, P-wave reflection and multichannel analysis of surface wave (MASW) data are acquired concurrently using this cost-effective system. Processed data depicts detailed characteristics relative to cross-sections based on sparse water wells drilled to depth in this area. Real-time GPS to sub-meter accuracy, 24-bit distributed recording, advanced vibrator electronics and feedback using 3C analogue geophones all operated by a single observer while operating the Vibroseis machine is a novel approach for shallow seismic applications. This equipment and methodology demonstrate a cost-effective approach to soil investigations for near surface shear velocities, soil characterization, and detailed lithology of quaternary valleys within the Canadian Prairies to in-fill drill locations and airborne geophysical methods.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81161486","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

Thermal Refraction: Impactions for Subglacial Heat Flux 热折射:冰下热通量的影响

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072986

S. Willcocks, D. Hasterok

引用次数: 2

CO2-water-rock predictions from aquifer and oil field drill core data: The Precipice Sandstone-Evergreen Formation CO2 storage reservoir-seal pair 从含水层和油田钻探岩心数据预测CO2-水-岩:悬崖砂岩-常绿组CO2储层-封对

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073162

J. Pearce, A. L. Croix, F. Brink, V. Honari, S. González, A. Harfoush, J. Underschultz

{"title":"CO2-water-rock predictions from aquifer and oil field drill core data: The Precipice Sandstone-Evergreen Formation CO2 storage reservoir-seal pair","authors":"J. Pearce, A. L. Croix, F. Brink, V. Honari, S. González, A. Harfoush, J. Underschultz","doi":"10.1080/22020586.2019.12073162","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073162","url":null,"abstract":"Summary The Surat Basin is one of the most prospective onshore basins in Australia for CO2 storage. The Precipice Sandstone and Evergreen Formation have been appraised for their feasibility as a future CO2 storage reservoir-seal pair. Here we will focus on predicted CO2-water-rock reactions. These predictions rely on mineral and porosity data from drill core. Data were obtained from northern and two southern regions of the Basin. The northern region was more data rich. The southern region is more well core and data sparse with the exception of the Moonie oil Field. Additional drill core samples were collected from archived well core of Moonie and other parts of the basin. The core samples were characterised for porosity, mineral, and metal content to build geochemical models to predict local CO2-water-rock reactions and their potential effect on reservoir scaling, changes to porosity and mineral trapping of CO2. For the northern region, our work has predicted low reactivity of the Precipice Sandstone, with mineral trapping in the Evergreen Formation. The Precipice Sandstone sampled in the Moonie field has different mineralogical characteristics to wells in the Northern region. Here, CO2-water-rock predictions indicate minor alteration of plagioclase and K-feldspar to kaolinite, chalcedony and ankerite in cleaner Moonie sandstones, with additionally precipitation of smectite in clay rich sands. Formation water pH was buffered between 5 and 6 by dissolution of calcite or siderite cements. Sampled core has also shown evidence of previous natural CO2 and hydrothermal fluid alteration, fractured quartz grains, and fracture fills with mineral trapping as carbonates. This type of natural analogue data is vital to validate long term predictions. New drill core and data are still required in future for the southern and central Surat Basin region which is most prospective for CO2 injection and storage.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89527065","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: 4

Inversion of magnetotellurics data with enhanced structural fidelity 增强结构保真度的大地电磁资料反演

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073124

F. Golfre' Andreasi, S. Re, F. Ceci, L. Masnaghetti

引用次数: 2

Collaborating on pre-competitive geophysical projects in the Northern Territory, Australia 在澳大利亚北领地合作开展竞争前的地球物理项目

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073134

T. Dhu, A. McCoy, I. Scrimgeour

引用次数: 1