Pub Date : 1900-01-01DOI: 10.3997/2214-4609.202112751
N. Masmoudi, A. Ratcliffe, M. Wang, Y. Xie, T. Wang
Depth imaging of converted-wave (P-to-S) ocean-bottom seismic (OBS) data requires a depth model for both the P- and S-wave velocities. Building the S-wave velocity model is very challenging: conventional techniques include PP and PS image registration, or joint PP and PS tomography. These approaches are often impeded by the lack of a reliable PS image in the shallow part of the model due to the sparse-receiver acquisition of typical OBS surveys, and have limited resolution to deal with complex lateral velocity variations. We introduce a new full-waveform inversion technique to update the S-wave velocity using converted-wave reflection data recorded in the radial component of OBS surveys. Key aspects of the method include the use of acoustic Born-modeling, a robust objective function to handle kinematic and dynamic differences, and a layer-stripping strategy to simplify the non-linearity of the inversion problem. The proposed approach is validated on different synthetics, and demonstrated on a field data example, giving an improved S-wave velocity and better reflector continuity for PS imaging.
{"title":"A practical implementation of converted-wave reflection full-waveform inversion","authors":"N. Masmoudi, A. Ratcliffe, M. Wang, Y. Xie, T. Wang","doi":"10.3997/2214-4609.202112751","DOIUrl":"https://doi.org/10.3997/2214-4609.202112751","url":null,"abstract":"Depth imaging of converted-wave (P-to-S) ocean-bottom seismic (OBS) data requires a depth model for both the P- and S-wave velocities. Building the S-wave velocity model is very challenging: conventional techniques include PP and PS image registration, or joint PP and PS tomography. These approaches are often impeded by the lack of a reliable PS image in the shallow part of the model due to the sparse-receiver acquisition of typical OBS surveys, and have limited resolution to deal with complex lateral velocity variations. We introduce a new full-waveform inversion technique to update the S-wave velocity using converted-wave reflection data recorded in the radial component of OBS surveys. Key aspects of the method include the use of acoustic Born-modeling, a robust objective function to handle kinematic and dynamic differences, and a layer-stripping strategy to simplify the non-linearity of the inversion problem. The proposed approach is validated on different synthetics, and demonstrated on a field data example, giving an improved S-wave velocity and better reflector continuity for PS imaging.","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125736662","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 : 1900-01-01DOI: 10.3997/2214-4609.202112765
M. Rodriguez, C. Reilly
{"title":"Assessing preferential orientations of fracture reactivation by iterative-statistical stress inversion from earthquakes in Taranaki, New Zealand","authors":"M. Rodriguez, C. Reilly","doi":"10.3997/2214-4609.202112765","DOIUrl":"https://doi.org/10.3997/2214-4609.202112765","url":null,"abstract":"","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123600397","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 : 1900-01-01DOI: 10.3997/2214-4609.202112717
H. Liu, G. Wu, J. Shan, S. Yang
As an important field of unconventional oil and gas exploration, fractured reservoir is equivalent to HTI medium because of the existence of high angle or nearly vertical fractures, which seismic response presents azimuthal anisotropy characteristics. Many scholars have considered the reflection and transmission coefficients of HTI media according to different research purposes. Based on Thomsen's theory, Rüger established an approximate formula for P and SV waves reflection/transmission coefficients in HTI media. (Thomsen,1986; Rüger,1998)
{"title":"First Order Perturbation Approximation of Azimuth Converted Wave Reflection Coefficient of HTI Media","authors":"H. Liu, G. Wu, J. Shan, S. Yang","doi":"10.3997/2214-4609.202112717","DOIUrl":"https://doi.org/10.3997/2214-4609.202112717","url":null,"abstract":"As an important field of unconventional oil and gas exploration, fractured reservoir is equivalent to HTI medium because of the existence of high angle or nearly vertical fractures, which seismic response presents azimuthal anisotropy characteristics. Many scholars have considered the reflection and transmission coefficients of HTI media according to different research purposes. Based on Thomsen's theory, Rüger established an approximate formula for P and SV waves reflection/transmission coefficients in HTI media. (Thomsen,1986; Rüger,1998)","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114918213","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 : 1900-01-01DOI: 10.3997/2214-4609.202112760
L. Xu, M. Han, J. Wang, A. Alsofi
Surfactants used for chemical flooding were usually anionic surfactants such as sulfate, sulfonates and carboxylates with different hydrophobic chains (Hirasaki et al. 2011, Negin et al. 2017). This is due to most chemical flooding applications were in sandstone reservoirs (Sheng 2010, Guo et al. 2018, Alvarado and Manrique, 2010). Sandstone is composed of quartz (SiO2) grains cemented together with a variety of minerals. As a result, the rock surface of sandstone is negatively charged. The adsorption of anionic surfactants on sandstone is low due to electrostatic repulsion. Polymers used were also negatively charged such as partially hydrolyzed polyacrylamides (Needham and Doe 1987, Zhu et al. 2015) and sulfonated polyacrylamides (Moradi-Araghi et al. 1987, Levitt et al. 2008).
用于化学驱的表面活性剂通常是阴离子表面活性剂，如具有不同疏水链的硫酸盐、磺酸盐和羧酸盐(Hirasaki et al. 2011, Negin et al. 2017)。这是由于大多数化学驱应用于砂岩储层(Sheng, 2010; Guo等，2018;Alvarado和Manrique, 2010)。砂岩是由石英(SiO2)颗粒与多种矿物胶结在一起而成。因此，砂岩的岩石表面带负电荷。阴离子表面活性剂由于静电斥力的作用，在砂岩上的吸附较低。所使用的聚合物也带负电，如部分水解的聚丙烯酰胺(Needham and Doe 1987, Zhu et al. 2015)和磺化的聚丙烯酰胺(Moradi-Araghi et al. 1987, Levitt et al. 2008)。
{"title":"Interaction of Cationic Surfactants with Anionic Polymers for Improving Oil Production","authors":"L. Xu, M. Han, J. Wang, A. Alsofi","doi":"10.3997/2214-4609.202112760","DOIUrl":"https://doi.org/10.3997/2214-4609.202112760","url":null,"abstract":"Surfactants used for chemical flooding were usually anionic surfactants such as sulfate, sulfonates and carboxylates with different hydrophobic chains (Hirasaki et al. 2011, Negin et al. 2017). This is due to most chemical flooding applications were in sandstone reservoirs (Sheng 2010, Guo et al. 2018, Alvarado and Manrique, 2010). Sandstone is composed of quartz (SiO2) grains cemented together with a variety of minerals. As a result, the rock surface of sandstone is negatively charged. The adsorption of anionic surfactants on sandstone is low due to electrostatic repulsion. Polymers used were also negatively charged such as partially hydrolyzed polyacrylamides (Needham and Doe 1987, Zhu et al. 2015) and sulfonated polyacrylamides (Moradi-Araghi et al. 1987, Levitt et al. 2008).","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129637680","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 : 1900-01-01DOI: 10.3997/2214-4609.202112735
M. Ichikawa, T. Mouri, A. Shigematsu, A. Kato, R. Nakata, N. Nakata, Z. Xue
{"title":"Application of time-lapse acoustic FWI to cross-well seismic monitoring data sets in a CCS field","authors":"M. Ichikawa, T. Mouri, A. Shigematsu, A. Kato, R. Nakata, N. Nakata, Z. Xue","doi":"10.3997/2214-4609.202112735","DOIUrl":"https://doi.org/10.3997/2214-4609.202112735","url":null,"abstract":"","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126377322","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 : 1900-01-01DOI: 10.3997/2214-4609.202112752
P. Tóth, A. Deltour
The Szolnok Oil Field in central Hungary – discovered in 1953 (Thamó-Bozsó, 2018) – was in continuous production until its final abandonment in the 1990s. The gross of the producer and appraisal wells were drilled between 1954-1958 and were measured with an obsolete “Eastern-European-type” of open hole logging suite. Historically these log curves were found to be essentially useful in delineating permeable layers, correlating sand-prone beds, stratigraphic well tops and distinguishing hydrocarbon from water-bearing zones. However, their application was rather limited for a quantitative characterization of any petrophysical properties (e.g., clay volume, porosity, water saturation), which are routinely obtainable from a modern open hole log set.
{"title":"Utilizing Vintage Logs for Modern Petrophysical Property Modelling of a Rejuvenated Oil Field – Szolnok, Hungary","authors":"P. Tóth, A. Deltour","doi":"10.3997/2214-4609.202112752","DOIUrl":"https://doi.org/10.3997/2214-4609.202112752","url":null,"abstract":"The Szolnok Oil Field in central Hungary – discovered in 1953 (Thamó-Bozsó, 2018) – was in continuous production until its final abandonment in the 1990s. The gross of the producer and appraisal wells were drilled between 1954-1958 and were measured with an obsolete “Eastern-European-type” of open hole logging suite. Historically these log curves were found to be essentially useful in delineating permeable layers, correlating sand-prone beds, stratigraphic well tops and distinguishing hydrocarbon from water-bearing zones. However, their application was rather limited for a quantitative characterization of any petrophysical properties (e.g., clay volume, porosity, water saturation), which are routinely obtainable from a modern open hole log set.","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122450197","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 : 1900-01-01DOI: 10.3997/2214-4609.202112722
X. Duan, Y. Li, G. Liu, H. Tan
{"title":"Frequency division constraint seismic stochastic inversion method and its application in Bohai Bay","authors":"X. Duan, Y. Li, G. Liu, H. Tan","doi":"10.3997/2214-4609.202112722","DOIUrl":"https://doi.org/10.3997/2214-4609.202112722","url":null,"abstract":"","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123576793","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 : 1900-01-01DOI: 10.3997/2214-4609.202112761
L. Clemmensen, M. Mau
{"title":"A 10-Myr record of Late Triassic lake deposition, Fleming Fjord Group, East Greenland","authors":"L. Clemmensen, M. Mau","doi":"10.3997/2214-4609.202112761","DOIUrl":"https://doi.org/10.3997/2214-4609.202112761","url":null,"abstract":"","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130800040","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 : 1900-01-01DOI: 10.3997/2214-4609.202112780
T. Seher, H. Masoomzadeh, C. Yang, S. Dong, S. Drewell, Z. Zhang
{"title":"Variable depth streamer deghosting using a linear Radon transform with a time domain sparsity constraint","authors":"T. Seher, H. Masoomzadeh, C. Yang, S. Dong, S. Drewell, Z. Zhang","doi":"10.3997/2214-4609.202112780","DOIUrl":"https://doi.org/10.3997/2214-4609.202112780","url":null,"abstract":"","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123478777","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 : 1900-01-01DOI: 10.3997/2214-4609.202112784
H. Huang, T. Wang, J. Cheng
Seismic anisotropy is widely distributed in the subsurface of Earth. In an anisotropic medium, P and S waves are intrinsically coupled due to the nature of elastic wave propagation. For the elastic reverse time migration (ERTM), it is essential to isolate the P and S wave modes before applying the imaging condition in order to avoid the image crosstalks. However, the polarization direction of P or S waves in anisotropic media, which is crucial for the mode separation, is no longer parallel or perpendicular to the propagation direction and will be spatially varying with the change of model parameters. Therefore, the wave mode separation or vector decomposition of elastic wavefields becomes infeasible because of the expensive computational cost to calculate the polarization.
{"title":"Elastic wave mode decomposition in anisotropic media with convolutional neural network","authors":"H. Huang, T. Wang, J. Cheng","doi":"10.3997/2214-4609.202112784","DOIUrl":"https://doi.org/10.3997/2214-4609.202112784","url":null,"abstract":"Seismic anisotropy is widely distributed in the subsurface of Earth. In an anisotropic medium, P and S waves are intrinsically coupled due to the nature of elastic wave propagation. For the elastic reverse time migration (ERTM), it is essential to isolate the P and S wave modes before applying the imaging condition in order to avoid the image crosstalks. However, the polarization direction of P or S waves in anisotropic media, which is crucial for the mode separation, is no longer parallel or perpendicular to the propagation direction and will be spatially varying with the change of model parameters. Therefore, the wave mode separation or vector decomposition of elastic wavefields becomes infeasible because of the expensive computational cost to calculate the polarization.","PeriodicalId":143998,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129833720","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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