pure and applied geophysics最新文献

{"title":"Estimation of Petrophysical Properties Using Linear Programming Sparse Spike Inversion and Deep Feed-Forward Neural Network Techniques Over F3 Block, Netherlands: A Case Study","authors":"Raghav Singh,&nbsp;Prabodh Kumar Kushwaha,&nbsp;S. P. Maurya,&nbsp;Piyush Rai","doi":"10.1007/s00024-024-03439-7","DOIUrl":"10.1007/s00024-024-03439-7","url":null,"abstract":"<div><p>In this study, acoustic impedance (P-impedance) distribution in the subsurface of the F3 block, Netherlands is determined using the linear programming (l₁-norm) sparse spike inversion (LPSSI) method. The objectives of the study are to characterize the sand channel and extract high-resolution subsurface rock features from the low-resolution seismic data. To estimate rock properties from seismic data, a variety of conventional post-stack seismic inversion techniques are available. However, the LPSSI technique is a reasonably quick and easy-to-compute subsurface model that can be employed for both quantitative and qualitative interpretation. The method is employed in two steps: first, composite traces close to well locations are retrieved and inverted for acoustic P-impedance, and then optimization of the LPSSI parameters is done using comparison with well log impedance. According to the analysis of the composite traces, the algorithm performs well and has a high average correlation (0.98). The F3 block seismic data are utilized in the second stage to estimate the distribution of acoustic impedance in the subsurface by using the LPSSI method. A sand channel-like low impedance anomaly with a range of 3800–7400 m/s g/cc is evident in the inverted acoustic impedance analysis at the 1380–1400 ms time interval. Then, using a deep feed-forward neural network (DFNN), many other crucial rock parameters, including porosity, density, and P-wave velocity, were estimated in the inter-well region to corroborate the sand channel. Following the analysis of these petrophysical properties, a high porosity zone (24–40%), low-density zone (1.9–2.02 g/cc), and low P-wave velocity zone (1700–2300 m/s) are present in the 1380–1400 ms time interval, which aligns with the low impedance zone and validates the presence of the sand channel.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"935 - 952"},"PeriodicalIF":1.9,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical Behavior and Air Tightness of Roadway Surrounding Rock Under High Internal Pressure","authors":"Chenlin Wang","doi":"10.1007/s00024-024-03442-y","DOIUrl":"10.1007/s00024-024-03442-y","url":null,"abstract":"<div><p>High-pressure air storage is an important part of a gas storage system. Abandoned coal mine roadways can provide a large number of air storage spaces. The geological conditions of coal mines in different areas vary, such as depth, surrounding rock grade, in situ stress state, and surrounding rock permeability, which directly affect the mechanical behavior and air tightness of roadway surrounding rock under high internal pressure. Therefore, the suitable internal pressure must be selected for abandoned roadways with different geological conditions. In this study, the numerical simulation software FLAC3D was used to calculate the stress, deformation, plastic zone volume, and pore pressure of surrounding rock of an abandoned roadway under 5–10 MPa internal pressure. Results show that some differences exist in the suitable internal pressure of the abandoned roadway under different geological conditions. When the in situ stress state was σ_H &gt; σ_h &gt; σ_v or σ_H &gt; σ_v &gt; σ_h, the suitable internal pressure of grade I, II, and III surrounding rocks was 5–7 and 8–10 MPa at the depth greater than 200 and 300 m, respectively; the suitable internal pressure of grade IV and V surrounding rocks was 5–6, 7–9, and 10 MPa at the depth greater than 200, 300, and 400 m, respectively. When the in situ stress state was σ_v &gt; σ_H &gt; σ_h, the suitable internal pressure of grade I, II, III, IV, and V surrounding rocks was 5–7 and 8–10 MPa at the depth greater than 300 and 400 m, respectively. Surrounding rock permeability can be used to evaluate the air tightness of roadway surrounding rock under high-pressure air. The surrounding rock permeability that can meet the sealing requirements of compressed air energy storage (CAES) caverns is less than 1 × 10⁻¹⁴ m², which are low-permeability strata. Low-permeability hard rock should be selected as much as possible. The research results provide a theoretical basis for the determination of internal pressure and the sealing evaluation of an abandoned coal mine roadway used for gas storage cavern.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 4","pages":"1221 - 1240"},"PeriodicalIF":1.9,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the Influence of the Shillong Plateau Topography on Thunderstorm Activity Over Northeast India","authors":"Rajesh Kumar Sahu,&nbsp;Bhishma Tyagi,&nbsp;Kuvar Satya Singh,&nbsp;Hara Prasad Nayak","doi":"10.1007/s00024-024-03445-9","DOIUrl":"10.1007/s00024-024-03445-9","url":null,"abstract":"<div><p>Northeast India (NEI) experiences frequent thunderstorms during the pre-monsoon season, which are catastrophic, resulting in significant loss of life and damage to infrastructure and property. The Shillong Plateau (SP) has been identified as a crucial triggering element in the initiation of these thunderstorms over NEI. Our investigation focuses on tracking changes in thermodynamic indicators over NEI to assess the SP's effect on thunderstorm initiation and propagation. The results show a substantial increase in thermodynamic index values across NEI when the SP topography is increased, indicating a rise in thunderstorm activity. On the other hand, reduced topography of the SP leads to a decrease in these indices, which is correlated with a reduction in thunderstorm intensity. We also found that lower SP topography corresponds with higher levels of precipitation, while higher SP topography has the opposite effect on precipitation. These findings emphasize the critical role of the SP topography in regulating pre-monsoon thunderstorms over NEI, with important implications for understanding and predicting regional weather patterns.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"1017 - 1038"},"PeriodicalIF":1.9,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140127457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-Dimensional Simulations of Subaerial Landslide-Generated Waves: Comparing OpenFOAM and FLOW-3D HYDRO Models","authors":"Ramtin Sabeti,&nbsp;Mohammad Heidarzadeh,&nbsp;Alessandro Romano,&nbsp;Gabriel Barajas Ojeda,&nbsp;Javier L. Lara","doi":"10.1007/s00024-024-03443-x","DOIUrl":"10.1007/s00024-024-03443-x","url":null,"abstract":"<div><p>The recent destructive landslide tsunamis, such as the 2018 Anak Krakatau event, were fresh reminders for developing validated three-dimensional numerical tools to accurately model landslide tsunamis and to predict their hazards. In this study, we perform Three-dimensional physical modelling of waves generated by subaerial solid-block landslides, and use the data to validate two numerical models: the commercial software FLOW-3D HYDRO and the open-source OpenFOAM package. These models are key representatives of the primary types of modelling tools—commercial and open-source—utilized by scientists and engineers in the field. This research is among a few studies on 3D physical and numerical models for landslide-generated waves, and it is the first time that the aforementioned two models are systematically compared. We show that the two models accurately reproduce the physical experiments and give similar performances in modelling landslide-generated waves. However, they apply different approaches, mechanisms and calibrations to deliver the tasks. It is found that the results of the two models are deviated by approximately 10% from one another. This guide helps engineers and scientists implement, calibrate, and validate these models for landslide-generated waves. The validity of this research is confined to solid-block subaerial landslides and their impact in the near-field zone.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 4","pages":"1075 - 1093"},"PeriodicalIF":1.9,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00024-024-03443-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140115638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-stack Seismic Probabilistic Inversion Method for Lithofacies and Elastic Parameters of Volcanic Reservoir","authors":"Da Zhang,&nbsp;Cai Liu,&nbsp;Pengfei Zhao,&nbsp;Qi Lu,&nbsp;Yinghan Qi","doi":"10.1007/s00024-024-03444-w","DOIUrl":"10.1007/s00024-024-03444-w","url":null,"abstract":"<div><p>Seismic inversion is the primary way to obtain subsurface models, lithologic and stratigraphic information. However, seismic elastic parameters inversion and ‘discrete lithofacies’ identification for complex volcanic reservoirs are usually independent during the whole inversion process. Also, the influence of reservoir lithology on elastic parameters is not always considered directly before lithofacies prediction. This paper proposes a probabilistic pre-stack seismic inversion method for lithofacies and elastic parameters of volcanic reservoirs. Under the framework of Bayesian inversion, considering that the prior probability distribution of elastic parameters of volcanic reservoirs is affected by volcanic lithofacies, a posteriori probability distribution characterized by a mixed probability model is first derived. Then, a single-point-direct sequential simulation stochastic algorithm with simultaneous optimization of multiple solutions is used to simulate the posterior probability distribution of elastic parameters and lithofacies of volcanic reservoirs, which improves the resolution of lithofacies prediction results of volcanic reservoirs. The feasibility and stability of our method are ensured through synthetic and field applications. The prediction results highly agree with logging curves and lithology logging interpretation data. We have improved the resolution of volcanic rock reservoir lithofacies prediction results. In one-dimensional tests, we achieved the prediction of lithofacies and elastic parameters for three types of volcanic lithofacies. The error compared to prior information is no higher than 15%, thereby verifying the method’s good noise resistance.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"829 - 846"},"PeriodicalIF":1.9,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140100005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphologic Adjustment of a River Reach with Groynes to Channel Bypassing","authors":"Milan Lehotský,&nbsp;Šárka Horáčková,&nbsp;Miloš Rusnák,&nbsp;Tomáš Štefanička,&nbsp;Jaroslav Kleň","doi":"10.1007/s00024-024-03433-z","DOIUrl":"10.1007/s00024-024-03433-z","url":null,"abstract":"<div><p>This article is focused on the investigation of the spatio-temporal variability of the Danube River reach’s vertical accretion thickness due to the response of the Danube River reach to bypassing. Five groyne-induced benches (GIBs) of the bypassed channel developed after water diversion in 1992 was studied by changes in topography for three-time spans (for the original gravel surface, for the surface before the 2013 flood and for the surface after the 2013 flood). The allostratigraphic approach was applied to 548 drilling probes at all GIBs and toptop, supra-platform, tail and backchannel geomorphic units have been identified at each GIB. The main to side-channel system connectivity increase sedimentation rates and the accretion was controlled by large flood events. The 100-year flood in 2013 contributed to the total volume by almost 26%. During study period 1992–2017, totally 1,146,589 m³ was accreted on five GIBs, of this 209,752 m³ during flood event in 2013 and 267,700 m³ in post flood period 2014–2017. The top geomorphic unit exhibits the highest median values of vertical accretion and for all GIBs accretion thickness are not related to the height above the mean channel water level. The thickness of accretion varied, likely because the variability of the vegetation cover caused variable hydraulic conditions and accretion rate span from 3.8 cm.year⁻¹ to 5.3 cm.year⁻¹. The investigation of the sediment thickness over long time spans 24 years and a large flood event) allowed us to conclude that the thickness is spatially variable for individual GIBs; however, its trend over time remains constants depending on the intake of sediments during large floodsd events. This article also provides a methodological template for the detailed investigation of river channel adjustment due to bypassing.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"977 - 1001"},"PeriodicalIF":1.9,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00024-024-03433-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of Source and Spectral Decay Parameters for Local Earthquakes in Siang Region of Arunachal Himalaya and Its Implication to the Tectonics and Crustal Heterogeneity","authors":"Amritansh Rai,&nbsp;Himanshu Mittal,&nbsp;G. P. Singh","doi":"10.1007/s00024-024-03436-w","DOIUrl":"10.1007/s00024-024-03436-w","url":null,"abstract":"<div><p>In our study, we estimated earthquake source parameters and spectral decay characteristics of 378 seismograms corresponding to 80 small earthquake events with magnitudes ranging from 1.5 to 3.5. These earthquakes occurred between July 2011 and May 2012 in the Siang region of the Arunachal Himalaya which is not well-studied. To estimate source parameters, the classical Brune model is employed and through the analysis, a scaling relationship is established between the estimated corner frequency (<span>(f_{c})</span>) and seismic moment (<span>(M_{0})</span>), which can be expressed as <span>(M_{0} = { 1}, times ,{1}0^{{{22}}} f_{c}^{{{-}{3}.{18}}})</span>. This relationship is in close agreement with previous studies conducted in the Arunachal and Himachal Himalaya regions. It provides support for deviations from self-similarity in the study area, offering valuable insights into the tectonics and structural heterogeneity beneath the Arunachal Himalaya. Our analysis revealed variations in source radius, ranging from 154.4 m to 312.6 m, and seismic moment, spanning from 2.37 × 10¹¹ N-m to 9.32 × 10¹³ N-m. Interestingly, we observed an increasing trend in stress drop, ranging from 0.013 MPa to 3.26 MPa, within the same range of seismic moment. This significant variation in stress drop primarily occurs in the upper 10–15 km of the Earth’s crust, indicating shear brittle failure in this upper crustal region. Furthermore, we conducted an in-depth examination of spectral parameters, including <span>(f_{c})</span> high-cut frequency (<i>f</i>_<i>max</i>), and high-frequency spectral decay parameter kappa (κ). Our study highlighted the dependence of κ and <i>f</i>_<i>max</i> estimates on both source characteristics and propagation path, with the source having the most substantial influence. This observation was substantiated through statistical analyses. Additionally, we explored the effect of recording site characteristics on κ and observed a significant contribution of shallow geology at the recording site. This was evident through a negative correlation between the site component of κ (κ₀) and V_S30, indicating that the local geology of the recording site plays a significant role in spectral parameter estimation. Based on our comprehensive data analysis and statistical observations, we conclude that the variations in source and decay parameters for earthquakes of different magnitudes are attributed to the diverse structural heterogeneities and complex seismotectonic processes underlying the Arunachal Himalaya region.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"789 - 813"},"PeriodicalIF":1.9,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140020086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observed Characteristics of Planetary Boundary Layer Processes and Associated Convection over a Tropical Location on the East Coast of India","authors":"S. S. Satpathy,&nbsp;S. Pattnaik,&nbsp;S. S. Chakraborty,&nbsp;D. Trivedi,&nbsp;A. Sisodiya","doi":"10.1007/s00024-023-03423-7","DOIUrl":"10.1007/s00024-023-03423-7","url":null,"abstract":"<div><p>This study characterizes the variability in different parameters using high-frequency ground-based instruments, i.e., ceilometer and Micro Rain Radar (MRR), on a diurnal scale installed at the Indian Institute of Technology Bhubaneswar, Odisha, India. The study evaluates cloud base height (CBH) and boundary layer height (BLH) to understand their role in influencing convection from liquid water content (LWC), rain rate, radar reflectivity, and fall velocity over a tropical location for different seasons on a diurnal scale. The data retrieved from these surface-based instruments are segregated into four different seasons, i.e., pre-monsoon, monsoon, post-monsoon, and winter, for 2019 and 2020. It is noted that the atmospheric processes influencing convection and associated rainfall over the study location differ for different seasons. The frequency distribution of different types of clouds depending on their vertical levels, i.e., low-level clouds (LLC), mid-level clouds (MLC), and high-level clouds (HLC), during different seasons revealed a high occurrence of low- to mid-level clouds in pre-monsoon and post-monsoon seasons, mid-level clouds in the monsoon season, and low-level clouds in the winter season. The results also illustrate that the rainfall during different seasons largely depends on the types of clouds, i.e., LLC, MLC, and HLC, as detected from the CBH layers, which contribute to convection and rainfall over the study location. It is also revealed that the boundary layer processes in convection and rainfall influence the evolution of BLH during different seasons. Further, the study compares model skills in verifying boundary layer height and rainfall against surface-based observations. Besides characterizing the diurnal variability in these parameters on a daily scale, the study also elucidates the relationship between the cloud types and BLH. The results indicate that LLC occurrences were positively related to BLH during the pre-monsoon and monsoon seasons in 2019 and 2020. In contrast, a negative correlation is observed for cloud types MLC and HLC with BLH for the rest of the seasons of 2019 and 2020. Also, during post-monsoon and monsoon, distinct signatures of deep convection are noted over the study region, suggesting the influence of the boundary layer on MLC and HLC. The results from radar reflectivity and fall velocity during the monsoon and post-monsoon season support the influence of MLC and HLC on deep convection over the region. The diurnal variation in the observed parameters on a seasonal scale will help in understanding the role of various atmospheric parameters and processes in convection and associated rainfall over a tropical location and can provide necessary verification skills for weather and climate regional models against observations.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"1039 - 1051"},"PeriodicalIF":1.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140020085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionospheric Response to Anomalous Geomagnetic Storm of 27 October 2021–05 November 2021","authors":"Asebe Oljira Geleta,&nbsp;Gizaw Mengistu Tsidu","doi":"10.1007/s00024-024-03434-y","DOIUrl":"10.1007/s00024-024-03434-y","url":null,"abstract":"<div><p>This study presents the first results on the ionospheric response and occurrence of ionospheric irregularities to the anomalous geomagnetic storm which occurred during period of 27 October 2021–05 November 2021 that was the first strong anomalous storm occurred in the current solar cycle with symmetric horizontal component (SYM-H) peak value of − 118 nT. Multi-site GPS observations from middle latitude of European longitudinal, equatorial region of American and Asian sector were used to analyze variations of total electron content (TEC) and the occurrence of the ionospheric irregularities during the storm period. The storm caused composite consequences on the terrestrial ionosphere. The remarkable positive ionospheric storm with deviation in TEC (ΔTEC) <span>(approx)</span>(120–200) %  was occurred at equatorial station over American within longitudinal belt of <span>({left(65-74right)}^{^circ })</span>W during the beginning of recovery phase of the storm. In addition, appreciable vertical total electron content enhancement of  ΔTEC <span>(approx)</span>(40–60) % was also noticed during recovery phase over European middle latitude with in longitudinal belt of <span>({left(2-20right)}^{^circ })</span> E. Regarding, occurrence of ionospheric irregularity the present study concluded that, the generation of ionospheric irregularity was completely suppressed during initial, major and recovery phase of the storm over both equatorial regions of American and Indian longitudinal sector. However, there was a moderate occurrence of ionospheric irregularity over both sectors during 27–31 October 2021, which could be attributed to the effect of 28 October solar flare and less intensity of southward-directed Bz component of the interplanetary magnetic field (IMFBz) during this periods. Moreover, the local time at which the maximum excursion of SYM-H may matter for the suppression of irregularities during the anomalous strong storm of 4 November 2021. In future, it may need further study, using additional observations and numerical modeling which may  shed more light on the response of anomalous geomagnetic storm of 4 November 2021. This study is presenting the first result of ionospheric response and the effects of anomalous geomagnetic storm of the current solar cycle on the occurrence of irregularities over low latitude region of South American and Asian sector.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"895 - 918"},"PeriodicalIF":1.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140009076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extraction of High Chargeability Distribution using Joint Inversion of Direct Current Resistivity and Time Domain Induced Polarization Data: A Development and Test Results on Uranium Bearing Target Rock","authors":"Vishnu Kant Verma,&nbsp;Shalini Singh,&nbsp;Anand Singh","doi":"10.1007/s00024-024-03432-0","DOIUrl":"10.1007/s00024-024-03432-0","url":null,"abstract":"<div><p>Induced polarization datasets, which assess the overvoltage characteristics of the subsurface, are becoming increasingly prevalent. These datasets are not limited to mineral resource exploration but are also gaining traction in various engineering applications. We present the result of joint inversion of direct current resistivity and induced polarization data. We have obtained two subsurface properties: electrical resistivity and chargeability, by minimizing the single objective function. For this purpose, we have computed the distorted apparent resistivity using the secondary voltage measure at each time gate. We compared our results with the conventional inversion of induced polarization on synthetic data with both high and low chargeable mineralized ore bodies. We noted that our approach provides a more reasonable model for high chargeable ore bodies. However, both joint inversion and nonlinear approaches give similar results for low-chargeable ore bodies. Nonlinear inversion of induced polarization was accomplished by solving two objective functions: One for resistivity and another one for induced polarization. Thus, error in the resistivity inversion propagates in the chargeability computation due to consequences. Further, the developed joint inversion algorithm is also applied to a field data set measured at the Beldih mine located in the West Bengal, India. We compared our final chargeability models with the local geology and geologic models obtained via other geophysical methods on the same profiles and found an excellent correlation in both models.</p></div>","PeriodicalId":21078,"journal":{"name":"pure and applied geophysics","volume":"181 3","pages":"953 - 976"},"PeriodicalIF":1.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139953233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}