Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900380
P. Xu, S. Ling
Summary The soil-rock interface is of great significance to urban construction and disaster prevention. In this paper, the H/V spectral ratio (HVSR method) based on the propagation characteristics of microtremor is used to mapping the interface in Jinan urban area, China. The results showed that the H/V curve types are depending on the type of bedrock and its weathering degree. Weak weathered limestone can use this method to obtain a better peak frequency-depth relationship, which can be used to estimate the depth of soil-rock interface in similar areas. However, the intrusive rocks with severe weathering can’t get ideal results.
{"title":"Soil-Rock Interface Mapping in Jinan urban area using H/V Spectral Ratio of the Microtremor","authors":"P. Xu, S. Ling","doi":"10.3997/2214-4609.201900380","DOIUrl":"https://doi.org/10.3997/2214-4609.201900380","url":null,"abstract":"Summary The soil-rock interface is of great significance to urban construction and disaster prevention. In this paper, the H/V spectral ratio (HVSR method) based on the propagation characteristics of microtremor is used to mapping the interface in Jinan urban area, China. The results showed that the H/V curve types are depending on the type of bedrock and its weathering degree. Weak weathered limestone can use this method to obtain a better peak frequency-depth relationship, which can be used to estimate the depth of soil-rock interface in similar areas. However, the intrusive rocks with severe weathering can’t get ideal results.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123040305","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900449
D. T. Kieu, W. Zygo, H. Van
{"title":"U-238 in IOCG Sin Quyen deposit, North Vietnam","authors":"D. T. Kieu, W. Zygo, H. Van","doi":"10.3997/2214-4609.201900449","DOIUrl":"https://doi.org/10.3997/2214-4609.201900449","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121096919","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900381
H. A. Khair, M. Adams
Summary Induced seismicity resulted from hydraulic fracturing is an unintended issue, and unpredicted by-product of tight reservoir development. We introduce a new workflow to identify the location and extent of the subtle faults (I.e. below or close to seismic resolution), which may also contribute to the risk of potential induced seismicity. A sequence of post stack seismic processing workflow is introduced. The location of the new identified subtle faults correlates well with the focus of the induced micro-seismicity events. Most Positive Curvature attribute identified a constant NW-SE fault orientation parallel to the Rocky Mountains. The stresses and pore pressures resulted from Mechanical earth models (ID MEM) were then applied on the interpreted faults, and fault susceptibility analysis was conducted. The authors suggest that N-NNE trending faults oriented to current day in-situ stress are critically stressed. This workflow offers a solution to avoid such critically stressed faults that may be prone to slip. It should be noted, that smaller scaled seismicity events, known as micro-seismicity should not be confused with larger events. This is primarily because micro-seismicity, and any seismicity under a Richter scale value of three are not believed to be associated with damage to buildings, or man-made structures.
{"title":"Marrying seismic attributes and geomechanical analysis for de-risking induced seismicity in unconventional reservoirs","authors":"H. A. Khair, M. Adams","doi":"10.3997/2214-4609.201900381","DOIUrl":"https://doi.org/10.3997/2214-4609.201900381","url":null,"abstract":"Summary Induced seismicity resulted from hydraulic fracturing is an unintended issue, and unpredicted by-product of tight reservoir development. We introduce a new workflow to identify the location and extent of the subtle faults (I.e. below or close to seismic resolution), which may also contribute to the risk of potential induced seismicity. A sequence of post stack seismic processing workflow is introduced. The location of the new identified subtle faults correlates well with the focus of the induced micro-seismicity events. Most Positive Curvature attribute identified a constant NW-SE fault orientation parallel to the Rocky Mountains. The stresses and pore pressures resulted from Mechanical earth models (ID MEM) were then applied on the interpreted faults, and fault susceptibility analysis was conducted. The authors suggest that N-NNE trending faults oriented to current day in-situ stress are critically stressed. This workflow offers a solution to avoid such critically stressed faults that may be prone to slip. It should be noted, that smaller scaled seismicity events, known as micro-seismicity should not be confused with larger events. This is primarily because micro-seismicity, and any seismicity under a Richter scale value of three are not believed to be associated with damage to buildings, or man-made structures.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126052082","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900414
C. Foss, T. Wilson, G. Gouthas, L. Katona, Philip Heath
{"title":"Magnetic source depth delineation of the Mulgathing Trough beneath cover in the Gawler Craton, South Australia","authors":"C. Foss, T. Wilson, G. Gouthas, L. Katona, Philip Heath","doi":"10.3997/2214-4609.201900414","DOIUrl":"https://doi.org/10.3997/2214-4609.201900414","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122314912","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900437
A. Mahallati, M. Montahaei
{"title":"Magnetotelluric monitoring of electrical resistivity changes in an active fault zone","authors":"A. Mahallati, M. Montahaei","doi":"10.3997/2214-4609.201900437","DOIUrl":"https://doi.org/10.3997/2214-4609.201900437","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121433813","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900401
M. Loke, T. Dahlin, D. Rucker
Resistivity surveys are now also carried in areas covered by water. The surveys involve electrodes planted on the water bottom or on a streamer towed by a boat. As the water layer has a large effect on resistivity measurements, its effect must be accurately modelled. The water resistivity and depth to the bottom are usually independently measured with a conductivity meter and depth sounder. The upper part of a finite-element grid is used to model the water layer, including possible variations in the water resistivity with depth. We show the results from a 2-D survey in Stockholm with electrodes planted on the sea bottom. The sediment thickness from the inverse model agrees well with drilling results and a possible weak zone in the bedrock was detected. Surveys with floating electrodes do not follow a straight line due to water currents and a 3-D inversion approach is required. An example is shown from a survey in the Panama Canal where the data from 19 sub-parallel lines are collated into a 3-D data set. The inverse model shows a conductive bottom with weathered marine sedimentary rocks and a remnant of an old river channel filled with more resistive sands and gravels.
{"title":"The inversion of 2-D and 3-D resistivity data from surveys in aquatic areas","authors":"M. Loke, T. Dahlin, D. Rucker","doi":"10.3997/2214-4609.201900401","DOIUrl":"https://doi.org/10.3997/2214-4609.201900401","url":null,"abstract":"Resistivity surveys are now also carried in areas covered by water. The surveys involve electrodes planted on the water bottom or on a streamer towed by a boat. As the water layer has a large effect on resistivity measurements, its effect must be accurately modelled. The water resistivity and depth to the bottom are usually independently measured with a conductivity meter and depth sounder. The upper part of a finite-element grid is used to model the water layer, including possible variations in the water resistivity with depth. We show the results from a 2-D survey in Stockholm with electrodes planted on the sea bottom. The sediment thickness from the inverse model agrees well with drilling results and a possible weak zone in the bedrock was detected. Surveys with floating electrodes do not follow a straight line due to water currents and a 3-D inversion approach is required. An example is shown from a survey in the Panama Canal where the data from 19 sub-parallel lines are collated into a 3-D data set. The inverse model shows a conductive bottom with weathered marine sedimentary rocks and a remnant of an old river channel filled with more resistive sands and gravels.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114305719","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900434
V. Loo
Summary Unmanned Aerial Vehicle (UAV) has been rapidly developed for the past decades. This technique has distinct advantages over traditional methods to produce aerial photographs. It can provide high resolution images with less time and cost. With photogrammetric techniques coupled with software as well as sufficient known parameters (focal length, pixel size, and distance of sensor from ground), the images can be processed to generate the contour map by commercial softwares. This research offers key insights on the application of UAV photogrammetry for slope surveying in civil engineering. The objective of this research is to validate the accuracy of applying photogrammetric methods via UAV surveying for a slope failure. Several surveying points are chosen to compare with the elevation obtained from UAV Photogrammetry. The result shows a difference less than 100mm which was found to be acceptable. The gain in time and labour savings reinforces the prospect of using UAV Photogrammetry as a cost-effective means for surveying of on-going construction site, slope survey, monitoring of slope movement and other application for civil engineering.
{"title":"Surveying a Slope Deformation along Highway by Application of Unmanned Aerial Vehicle (UAV)","authors":"V. Loo","doi":"10.3997/2214-4609.201900434","DOIUrl":"https://doi.org/10.3997/2214-4609.201900434","url":null,"abstract":"Summary Unmanned Aerial Vehicle (UAV) has been rapidly developed for the past decades. This technique has distinct advantages over traditional methods to produce aerial photographs. It can provide high resolution images with less time and cost. With photogrammetric techniques coupled with software as well as sufficient known parameters (focal length, pixel size, and distance of sensor from ground), the images can be processed to generate the contour map by commercial softwares. This research offers key insights on the application of UAV photogrammetry for slope surveying in civil engineering. The objective of this research is to validate the accuracy of applying photogrammetric methods via UAV surveying for a slope failure. Several surveying points are chosen to compare with the elevation obtained from UAV Photogrammetry. The result shows a difference less than 100mm which was found to be acceptable. The gain in time and labour savings reinforces the prospect of using UAV Photogrammetry as a cost-effective means for surveying of on-going construction site, slope survey, monitoring of slope movement and other application for civil engineering.","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121604085","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900448
M. A. Hellmy, R. Muhammad, M. Shuib, T. Ng, W. Abdullah
{"title":"Reconnaissance Survey of Limestone Cliff in Bukit Takun, Templers Park by Terrestrial","authors":"M. A. Hellmy, R. Muhammad, M. Shuib, T. Ng, W. Abdullah","doi":"10.3997/2214-4609.201900448","DOIUrl":"https://doi.org/10.3997/2214-4609.201900448","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115902083","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900450
Y. Kolesnikov, K. Fedin
{"title":"Determination of resonant properties of near-surface layer using microtremor data","authors":"Y. Kolesnikov, K. Fedin","doi":"10.3997/2214-4609.201900450","DOIUrl":"https://doi.org/10.3997/2214-4609.201900450","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134288038","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}
Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900430
Bin Zhou, M. van de Werken
{"title":"Prediction of Coal Top by Conductively-Guided Borehole Radar Waves: Results from Field Trials","authors":"Bin Zhou, M. van de Werken","doi":"10.3997/2214-4609.201900430","DOIUrl":"https://doi.org/10.3997/2214-4609.201900430","url":null,"abstract":"","PeriodicalId":393867,"journal":{"name":"EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128180714","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：