Pub Date : 2018-08-27DOI: 10.1190/SEGAM2018-2997392.1
Oscar Ramirez, Genmeng Chen, M. Saunders, L. Geiger, M. Cvetković, Mark Roberts, R. Clarke
Imaging sedimentary basins in the context of oil and gas exploration entails different but complementary objectives. Understanding the tectonic architecture of a basin requires acquisition and processing strategies that differ from those strategies that are required to understand play fairways and prospects. In this paper we demonstrate effective processing strategies that produce clear and consistent images of the Moho discontinuity and elements of the crystalline basement, with equally clear images of the sedimentary section showing amplitude anomalies consistent with the presence of hydrocarbons.
{"title":"Mudline to Moho: Imaging from the seafloor to the Moho discontinuity offshore Argentina","authors":"Oscar Ramirez, Genmeng Chen, M. Saunders, L. Geiger, M. Cvetković, Mark Roberts, R. Clarke","doi":"10.1190/SEGAM2018-2997392.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2997392.1","url":null,"abstract":"Imaging sedimentary basins in the context of oil and gas exploration entails different but complementary objectives. Understanding the tectonic architecture of a basin requires acquisition and processing strategies that differ from those strategies that are required to understand play fairways and prospects. In this paper we demonstrate effective processing strategies that produce clear and consistent images of the Moho discontinuity and elements of the crystalline basement, with equally clear images of the sedimentary section showing amplitude anomalies consistent with the presence of hydrocarbons.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131985778","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2995460.1
E. Manukyan, H. Maurer
{"title":"Imaging of radioactive-waste repository with vertically transversely isotropic full-waveform inversion","authors":"E. Manukyan, H. Maurer","doi":"10.1190/SEGAM2018-2995460.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2995460.1","url":null,"abstract":"","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131999032","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2991018.1
M. Zoback, Jens-Erik Lund Snee
Multi-stage hydraulic fracturing increases production from extremely low-permeability unconventional reservoirs by simultaneously inducing slip on pre-existing fracture planes. Here we illustrate how the high pore pressure generated during hydraulic fracturing operations induces slip on preexisting fractures and faults with a wide range of orientations, thus creating an interconnected permeable fracture network. We demonstrate the basic principles of stimulating slip on poorly oriented faults using the stress state for a horizontal well in the Barnett Shale where fracture orientation data are also available from an image log. We compare this analysis with independent fracture orientation data obtained from earthquake focal plane mechanisms. Using the stress data, we are able to determine which nodal plane slipped in each microseismic event. As the two analyses yield essentially identical results, they show the basic processes by which slip on planes of varied orientations occurs during hydraulic stimulation. We extend this analysis to address some misconceptions about the likelihood of slip on horizontal bedding planes and planes parallel and perpendicular to horizontal principal stress directions. Notably, we show that inducing slip on horizontal or sub-horizontal bedding planes is nearly impossible except in compressive (reverse to strike-slip/reverse) stress states (SHmax ≥ Shmin ≈ SV) or when ambient pore pressure is extremely high. The latter case results in very small differences in the magnitudes of the three principal stresses, regardless of the regional stress state.
{"title":"Predicted and observed shear on preexisting faults during hydraulic fracture stimulation","authors":"M. Zoback, Jens-Erik Lund Snee","doi":"10.1190/SEGAM2018-2991018.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2991018.1","url":null,"abstract":"Multi-stage hydraulic fracturing increases production from extremely low-permeability unconventional reservoirs by simultaneously inducing slip on pre-existing fracture planes. Here we illustrate how the high pore pressure generated during hydraulic fracturing operations induces slip on preexisting fractures and faults with a wide range of orientations, thus creating an interconnected permeable fracture network. We demonstrate the basic principles of stimulating slip on poorly oriented faults using the stress state for a horizontal well in the Barnett Shale where fracture orientation data are also available from an image log. We compare this analysis with independent fracture orientation data obtained from earthquake focal plane mechanisms. Using the stress data, we are able to determine which nodal plane slipped in each microseismic event. As the two analyses yield essentially identical results, they show the basic processes by which slip on planes of varied orientations occurs during hydraulic stimulation. We extend this analysis to address some misconceptions about the likelihood of slip on horizontal bedding planes and planes parallel and perpendicular to horizontal principal stress directions. Notably, we show that inducing slip on horizontal or sub-horizontal bedding planes is nearly impossible except in compressive (reverse to strike-slip/reverse) stress states (SHmax ≥ Shmin ≈ SV) or when ambient pore pressure is extremely high. The latter case results in very small differences in the magnitudes of the three principal stresses, regardless of the regional stress state.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129980697","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2997991.1
Yaoguo Li
{"title":"On the zero-level curves and surfaces in potential fields","authors":"Yaoguo Li","doi":"10.1190/SEGAM2018-2997991.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2997991.1","url":null,"abstract":"","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060815","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 : 2018-08-27DOI: 10.1190/SEGAM2018-W12-04.1
V. Kazei, T. Alkhalifah
SUMMARY Imperfect illumination from surface seismic data due to lack of aperture and frequency content leads to ambiguity and resolution loss in seismic images and in full-waveform inversion (FWI) results. The resolution of time-lapse velocity updates can, however, be improved enforcing the sparsity of the parameter changes. Edge-preserving regularizations and constraints are typically used to promote sparsity. However, different choice of regularization parameters leads to different inversion results and optimal parameters are hard to identify, especially for real data. In particular it is not straightforward to balance the inversion between sparsity constraint and data fit. Fortunately, it is possible to estimate local spatial wavenum-bers in a velocity model that are best illuminated by the data. We propose to constrain part of the model difference spectrum that is well illuminated by the data and optimize the rest of the spectrum to enhance sparsity. We approximate correctly retrieved model wavenumbers by simply picking large enough values in the inverted spectrum and constrain that part of model spectrum. Then we adjust the rest of the wavenumbers to reduce the value of a Sobolev space norm (SSN). SSN reduction promotes sparsity of time-lapse updates, while spectral constraints ensure that the part of the modeled spectrum retrieved from the data is completely retained. Application to synthetic noisy data for a perturbation of the Marmousi II model shows that the model resolution can be improved by using our method to extrapolate the model spectrum.
{"title":"Time-lapse waveform inversion regularized by spectral constraints and Sobolev space norm","authors":"V. Kazei, T. Alkhalifah","doi":"10.1190/SEGAM2018-W12-04.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-W12-04.1","url":null,"abstract":"SUMMARY Imperfect illumination from surface seismic data due to lack of aperture and frequency content leads to ambiguity and resolution loss in seismic images and in full-waveform inversion (FWI) results. The resolution of time-lapse velocity updates can, however, be improved enforcing the sparsity of the parameter changes. Edge-preserving regularizations and constraints are typically used to promote sparsity. However, different choice of regularization parameters leads to different inversion results and optimal parameters are hard to identify, especially for real data. In particular it is not straightforward to balance the inversion between sparsity constraint and data fit. Fortunately, it is possible to estimate local spatial wavenum-bers in a velocity model that are best illuminated by the data. We propose to constrain part of the model difference spectrum that is well illuminated by the data and optimize the rest of the spectrum to enhance sparsity. We approximate correctly retrieved model wavenumbers by simply picking large enough values in the inverted spectrum and constrain that part of model spectrum. Then we adjust the rest of the wavenumbers to reduce the value of a Sobolev space norm (SSN). SSN reduction promotes sparsity of time-lapse updates, while spectral constraints ensure that the part of the modeled spectrum retrieved from the data is completely retained. Application to synthetic noisy data for a perturbation of the Marmousi II model shows that the model resolution can be improved by using our method to extrapolate the model spectrum.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130063753","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2998625.1
A. Barone, A. Vassiliou
Many important data processing techniques that are used in typical seismic processing workflows rely on one or both the of following assumptions: 1) that data are spatially located on a regular grid, and 2) that data are all located at the same elevation. Seismic surveys are often designed such that these assumptions are close to correct, but (in particular for land data) they are never exactly met. Kirchhoff-based Wavefield continuation offers an effective and efficient method for re-datuming seismic data to accurately account for the effects of topography. This method inherently produces an output that is regularly gridded at user-specified intervals, which both regularizes the spatial gridding of the data and “fills in” minor holes in the data coverage. Combined, these effects ensure the aforementioned data processing assumptions are met rather than just approximated, which in turn will improve the accuracy of all subsequent data processing steps in a given seismic processing workflow.
{"title":"2D/3D Kirchhoff-based wavefield continuation","authors":"A. Barone, A. Vassiliou","doi":"10.1190/SEGAM2018-2998625.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2998625.1","url":null,"abstract":"Many important data processing techniques that are used in typical seismic processing workflows rely on one or both the of following assumptions: 1) that data are spatially located on a regular grid, and 2) that data are all located at the same elevation. Seismic surveys are often designed such that these assumptions are close to correct, but (in particular for land data) they are never exactly met. Kirchhoff-based Wavefield continuation offers an effective and efficient method for re-datuming seismic data to accurately account for the effects of topography. This method inherently produces an output that is regularly gridded at user-specified intervals, which both regularizes the spatial gridding of the data and “fills in” minor holes in the data coverage. Combined, these effects ensure the aforementioned data processing assumptions are met rather than just approximated, which in turn will improve the accuracy of all subsequent data processing steps in a given seismic processing workflow.","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130447137","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2965257.1
J. Kruk, C. Hebel, C. Brogi, M. Kaufmann, Xihe Tan, L. Weihermüller, J. Huisman, H. Vereecken, A. Mester
{"title":"Calibration, inversion, and applications of multiconfiguration electromagnetic induction for agricultural top- and subsoil characterization","authors":"J. Kruk, C. Hebel, C. Brogi, M. Kaufmann, Xihe Tan, L. Weihermüller, J. Huisman, H. Vereecken, A. Mester","doi":"10.1190/SEGAM2018-2965257.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2965257.1","url":null,"abstract":"","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133981249","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 : 2018-08-27DOI: 10.1190/SEGAM2018-2995993.1
Li Wang, Guangzhi Zhang, Xingyao Yin
{"title":"Stochastic inversion of AVO based on an improved MCMC method","authors":"Li Wang, Guangzhi Zhang, Xingyao Yin","doi":"10.1190/SEGAM2018-2995993.1","DOIUrl":"https://doi.org/10.1190/SEGAM2018-2995993.1","url":null,"abstract":"","PeriodicalId":158800,"journal":{"name":"SEG Technical Program Expanded Abstracts 2018","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134388920","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：