Pub Date : 2019-04-24DOI: 10.3997/2214-4609.201900405
A. A. Furkhan, A. Adipta, W. S. Giamboro, Y. Yatini
Summary This paper will discuss the preliminary examination of andesite quarry mining feasibility in due respect of the volumetric reserves and its overburden thickness. The volumetric reserves were done by calculating the andesite tonnage that utilizes the volume-based resistivity characteristics and density. In addition, overburden thickness was estimated between the top andesite and the topography elevation. The study concluded that the amount of andesite reserves are viable enough to be further detailed mining study.
{"title":"Preliminary Feasibility Study Based on Resistivity Volumetric Calculation : Andesite Quarry","authors":"A. A. Furkhan, A. Adipta, W. S. Giamboro, Y. Yatini","doi":"10.3997/2214-4609.201900405","DOIUrl":"https://doi.org/10.3997/2214-4609.201900405","url":null,"abstract":"Summary This paper will discuss the preliminary examination of andesite quarry mining feasibility in due respect of the volumetric reserves and its overburden thickness. The volumetric reserves were done by calculating the andesite tonnage that utilizes the volume-based resistivity characteristics and density. In addition, overburden thickness was estimated between the top andesite and the topography elevation. The study concluded that the amount of andesite reserves are viable enough to be further detailed mining study.","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":"130915064","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: 10.3997/2214-4609.201900419
N. Muztaza, N. A. Nawawi, M. T. Zakaria, T. Adeeko
Summary The study explores the use of 2-D resistivity method to identify the type of mudstone from the outcrop of Bukit Chondong (BC), Perlis. The distinction of mudstone is based from the comparison of resistivity values of different mudstone, which are the red mudstone and the grey mudstone from outcrop of Guar Jentik (GJ) and Utan Aji (UA) in Perlis. All the survey outcrops was identified within the same classification of Kubang Pasu Formation. The resistivity survey was performed using SAS4000 Terrameter with Pole-dipole array configuration. The resistivity was implemented on a single 40 m survey line with minimum 1 m electrode spacing. The resistivity data was processed by utilizing RES2DINV and Surfer 10 software which the inversion results was displayed in a form of contouring values. The range of resistivity value for red mudstone is 10 to 150 Ωm and grey mudstone is 120 to 500 Ωm. The resistivity value for mudstone of BC is 20 to 130 Ωm, which fall in the range values of red mudstone. Thus, mudstone of BC has the possible to be classified as red mudstone.
{"title":"Distinction of the Type of Mudstone at Bukt Chondong, Perlis Using 2-D Resistivity Method","authors":"N. Muztaza, N. A. Nawawi, M. T. Zakaria, T. Adeeko","doi":"10.3997/2214-4609.201900419","DOIUrl":"https://doi.org/10.3997/2214-4609.201900419","url":null,"abstract":"Summary The study explores the use of 2-D resistivity method to identify the type of mudstone from the outcrop of Bukit Chondong (BC), Perlis. The distinction of mudstone is based from the comparison of resistivity values of different mudstone, which are the red mudstone and the grey mudstone from outcrop of Guar Jentik (GJ) and Utan Aji (UA) in Perlis. All the survey outcrops was identified within the same classification of Kubang Pasu Formation. The resistivity survey was performed using SAS4000 Terrameter with Pole-dipole array configuration. The resistivity was implemented on a single 40 m survey line with minimum 1 m electrode spacing. The resistivity data was processed by utilizing RES2DINV and Surfer 10 software which the inversion results was displayed in a form of contouring values. The range of resistivity value for red mudstone is 10 to 150 Ωm and grey mudstone is 120 to 500 Ωm. The resistivity value for mudstone of BC is 20 to 130 Ωm, which fall in the range values of red mudstone. Thus, mudstone of BC has the possible to be classified as red mudstone.","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":"133637422","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: 10.3997/2214-4609.201900439
X. Tang, Z. Xiong, C. Zhao, D. Li
{"title":"Three-Dimensional numerical Simulation of Vertical Line Source Borehole-to-surface electrical method","authors":"X. Tang, Z. Xiong, C. Zhao, D. Li","doi":"10.3997/2214-4609.201900439","DOIUrl":"https://doi.org/10.3997/2214-4609.201900439","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":"133972120","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: 10.3997/2214-4609.201900378
H. Liu, T. Hu, A. Li, Y. Yuan
Summary A straightforward and naive implementation of elastic reverse time migration (ERTM) might produce images that are not very useful mainly because they are filled with noises arising from incorrectly imaged mode conversions, cross-talk, and back-scattered energy. Therefore, we present a ERTM workflow that overcomes these problems. We first employ vector-based normalized cross-correlation imaging conditions (VBNICs) for PP and PS reflections to avoid cross-talk and polarity reversal. Based on Poynting-vector imaging condition, we implement angle filtering to reduce low-wavenumber and high-amplitude noise. Then, we efficiently extract dip-angle gathers by using Poynting vectors and finally utilize them to attenuate the artifact caused by non-physical wave-mode conversions because their slopes differ from the migration dip. Numerical examples demonstrate that the proposed ERTM workflow can produce images with less noise and higher quality.
{"title":"Reducing ERTM artifact arising from incorrectly imaged mode conversions in the dip-angle domain","authors":"H. Liu, T. Hu, A. Li, Y. Yuan","doi":"10.3997/2214-4609.201900378","DOIUrl":"https://doi.org/10.3997/2214-4609.201900378","url":null,"abstract":"Summary A straightforward and naive implementation of elastic reverse time migration (ERTM) might produce images that are not very useful mainly because they are filled with noises arising from incorrectly imaged mode conversions, cross-talk, and back-scattered energy. Therefore, we present a ERTM workflow that overcomes these problems. We first employ vector-based normalized cross-correlation imaging conditions (VBNICs) for PP and PS reflections to avoid cross-talk and polarity reversal. Based on Poynting-vector imaging condition, we implement angle filtering to reduce low-wavenumber and high-amplitude noise. Then, we efficiently extract dip-angle gathers by using Poynting vectors and finally utilize them to attenuate the artifact caused by non-physical wave-mode conversions because their slopes differ from the migration dip. Numerical examples demonstrate that the proposed ERTM workflow can produce images with less noise and higher quality.","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":"114448750","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: 10.3997/2214-4609.201900392
P. Irarue
Summary The linear discontinuity in the magnetic data pattern which separates the contrasting magnetic intensity areas to the north and south coincides with the location and orientation of the major east-west trending and southerly dipping near vertical fault structure observed at Galagalalana and Seuseulina thermal sites in the west and also with the Bolousunamo fumarole site on higher land area toward the east. Moderate to low magnetic intensity anomalies were concentrated toward the south side of the linear discontinuity thus indicating intense hydrothermal activity (or alteration) toward the south. This also suggests that the localized up flow on the structure (faults) may have been pushed toward the south due to the N-S hydrological gradient thus causing demagnetization to the south. A preliminary model proposed for Deidei geothermal system suggests neutral chloride outflow at low land areas (Seuseulina and Yaiyaiboalana boiling springs) towards the west and steam and hot pressurized water up flow at higher land areas (Bolousunamo acid sulphate fumarole) toward the east.
{"title":"A preliminary ground magnetic and resistivity investigations on Deidei geothermal area, Papua New Guinea","authors":"P. Irarue","doi":"10.3997/2214-4609.201900392","DOIUrl":"https://doi.org/10.3997/2214-4609.201900392","url":null,"abstract":"Summary The linear discontinuity in the magnetic data pattern which separates the contrasting magnetic intensity areas to the north and south coincides with the location and orientation of the major east-west trending and southerly dipping near vertical fault structure observed at Galagalalana and Seuseulina thermal sites in the west and also with the Bolousunamo fumarole site on higher land area toward the east. Moderate to low magnetic intensity anomalies were concentrated toward the south side of the linear discontinuity thus indicating intense hydrothermal activity (or alteration) toward the south. This also suggests that the localized up flow on the structure (faults) may have been pushed toward the south due to the N-S hydrological gradient thus causing demagnetization to the south. A preliminary model proposed for Deidei geothermal system suggests neutral chloride outflow at low land areas (Seuseulina and Yaiyaiboalana boiling springs) towards the west and steam and hot pressurized water up flow at higher land areas (Bolousunamo acid sulphate fumarole) toward the east.","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":"126153628","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: 10.3997/2214-4609.201900422
C. Arnhardt, H. Reeves, N. Fatt
{"title":"Collaborative validation of hazard susceptibility mapping for Kuala Lumpur","authors":"C. Arnhardt, H. Reeves, N. Fatt","doi":"10.3997/2214-4609.201900422","DOIUrl":"https://doi.org/10.3997/2214-4609.201900422","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":"133692887","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: 10.3997/2214-4609.201900406
S. Irawati, Hidayat, H. Grandis
Summary Magnetotellurics (MT) is a passive electromagnetic method that measures fluctuations of electric and magnetic fields at the earth’s surface. In this study, MT method is applied for basin delineation based on the resistivity contrast between sediments and basement. Thirty MT stations were deployed at eastern part of the Kutai basin, East Kalimantan, Indonesia. We analyzed the MT data using phase tensor analysis, to obtain the dimensionality and the geoelectrical strike of the subsurface. Most of the MT data are characterized by phase ellipse and low skew value (-3o < β < 3o). This indicates that MT data have 2D character with the direction of geoelectrical strike N 30o E. This result is in a good agreement with the geological strike that of NE-SW direction. We performed 2D modeling at two lines to obtain the resistivity configuration of the Kutai basin. The low resistivity anomalies may be associated with shale or black shale of the Pamaluan Formation showing geometries influenced by Samarinda anticlinorium and its fault structures.
{"title":"Magnetotelluric (MT) Data Analysis and 2D Modeling of the Kutai Basin, Indonesia: Preliminary Results","authors":"S. Irawati, Hidayat, H. Grandis","doi":"10.3997/2214-4609.201900406","DOIUrl":"https://doi.org/10.3997/2214-4609.201900406","url":null,"abstract":"Summary Magnetotellurics (MT) is a passive electromagnetic method that measures fluctuations of electric and magnetic fields at the earth’s surface. In this study, MT method is applied for basin delineation based on the resistivity contrast between sediments and basement. Thirty MT stations were deployed at eastern part of the Kutai basin, East Kalimantan, Indonesia. We analyzed the MT data using phase tensor analysis, to obtain the dimensionality and the geoelectrical strike of the subsurface. Most of the MT data are characterized by phase ellipse and low skew value (-3o < β < 3o). This indicates that MT data have 2D character with the direction of geoelectrical strike N 30o E. This result is in a good agreement with the geological strike that of NE-SW direction. We performed 2D modeling at two lines to obtain the resistivity configuration of the Kutai basin. The low resistivity anomalies may be associated with shale or black shale of the Pamaluan Formation showing geometries influenced by Samarinda anticlinorium and its fault 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":"122208571","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: 10.3997/2214-4609.201900376
M. Gouda, A. Salim, G. Hamada
Summary Seismic velocity is a pivotal geophysical property that contains important information about Earth layers. The layering of Earth, clay content and fractures within layers are the main causes of the dependence of seismic velocity on the angle of incidence which is called: “Seismic Anisotropy”. Seismic anisotropy affects the velocity-dependant attributes such as Acoustic Impedance resulting in misinterpretation of seismic data. Consequently, anisotropy correction of acoustic impedance is important to mitigate the uncertainty. Anisotropy parameters can be obtained from core data and well logs with various methods. However, the common limitation in the previous work is that anisotropy is obtained at well locations neglecting the lateral heterogeneity of layers. This study aims to obtain anisotropy-free acoustic impedance (Zp0) from the partial-stack inversion of near, mid and far-angle stacks. The outputs of the inversion are used to obtain Zp0 by three different methods: the refactorization of Thomsen’s anisotropy equation, statistical modelling, and the Multi-Layer Feedforward Neural Network Theory (MLFN). The results obtained from the MLFN and the refactorized Thomsen’s model showed better matching with impedance logs, more obvious lateral continuity of layers and more enhanced amplitude spectrum compared to the uncorrected P-impedance. Such improvement reduces the uncertainty of the final reservoir model.
{"title":"Estimation of Anisotropy-Free Acoustic Impedance from Partial-Stack Seismic Inversion: A Case Study From Inas Field, Malay Basin","authors":"M. Gouda, A. Salim, G. Hamada","doi":"10.3997/2214-4609.201900376","DOIUrl":"https://doi.org/10.3997/2214-4609.201900376","url":null,"abstract":"Summary Seismic velocity is a pivotal geophysical property that contains important information about Earth layers. The layering of Earth, clay content and fractures within layers are the main causes of the dependence of seismic velocity on the angle of incidence which is called: “Seismic Anisotropy”. Seismic anisotropy affects the velocity-dependant attributes such as Acoustic Impedance resulting in misinterpretation of seismic data. Consequently, anisotropy correction of acoustic impedance is important to mitigate the uncertainty. Anisotropy parameters can be obtained from core data and well logs with various methods. However, the common limitation in the previous work is that anisotropy is obtained at well locations neglecting the lateral heterogeneity of layers. This study aims to obtain anisotropy-free acoustic impedance (Zp0) from the partial-stack inversion of near, mid and far-angle stacks. The outputs of the inversion are used to obtain Zp0 by three different methods: the refactorization of Thomsen’s anisotropy equation, statistical modelling, and the Multi-Layer Feedforward Neural Network Theory (MLFN). The results obtained from the MLFN and the refactorized Thomsen’s model showed better matching with impedance logs, more obvious lateral continuity of layers and more enhanced amplitude spectrum compared to the uncorrected P-impedance. Such improvement reduces the uncertainty of the final reservoir model.","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":"132018523","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: 10.3997/2214-4609.201900379
S. Bazin, A. Köhler, G. Sauvin, J. Park, J. Johansson, S. Senna
Summary The objective of this study is to find an efficient way to measure bedrock depth and geotechnical parameters through the estimation of shear wave velocity, Vs. The Norwegian Geo Test Sites (NGTS) initiative aims to establish five national test sites as field laboratory for testing innovative soil investigation and foundation methods. We have measured ambient seismic noise data as well as Multichannel Analysis of Surface Waves (MASW) data at two NGTS sites, Onsoy and Halden. The results of the shear-wave inversions are compared with ground-truth measurements from the two well-characterized sites. The results obtained with the passive seismic test and the MASW active test are quite similar despite the fact the passive method requires less time and equipment in the field.
{"title":"Site characterization with ambient seismic noise at the Norwegian Geo Test Sites","authors":"S. Bazin, A. Köhler, G. Sauvin, J. Park, J. Johansson, S. Senna","doi":"10.3997/2214-4609.201900379","DOIUrl":"https://doi.org/10.3997/2214-4609.201900379","url":null,"abstract":"Summary The objective of this study is to find an efficient way to measure bedrock depth and geotechnical parameters through the estimation of shear wave velocity, Vs. The Norwegian Geo Test Sites (NGTS) initiative aims to establish five national test sites as field laboratory for testing innovative soil investigation and foundation methods. We have measured ambient seismic noise data as well as Multichannel Analysis of Surface Waves (MASW) data at two NGTS sites, Onsoy and Halden. The results of the shear-wave inversions are compared with ground-truth measurements from the two well-characterized sites. The results obtained with the passive seismic test and the MASW active test are quite similar despite the fact the passive method requires less time and equipment in the field.","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":"132028129","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: 10.3997/2214-4609.201900410
E. Purnomo, A. Biswas, D. Ghosh, C. Sum
{"title":"Under Gas Clouds Effects Shallow Marine Gas Reservoir Delineation","authors":"E. Purnomo, A. Biswas, D. Ghosh, C. Sum","doi":"10.3997/2214-4609.201900410","DOIUrl":"https://doi.org/10.3997/2214-4609.201900410","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":"126885383","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}
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