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TOWARDS SURFACE-BASED HYDRAULIC CONDUCTIVITY MAPPING USING SEISMOELECTRIC SIGNALS AND DATA-DRIVEN MODELS

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dc.creatorROBERTO ESTEBAN AEDO GARCÍA
dc.creatorGONZALO SEBASTIÁN SALDÍAS YAU
dc.creatorCARLOS RODRIGO REY BARRA
dc.creatorMIGUEL ANGEL CAMILO VALDEBENITO CHÁVEZ
dc.date2026
dc.date.accessioned2026-09-22T20:33:23Z
dc.date.available2026-09-22T20:33:23Z
dc.date.issued2026
dc.description.abstractESTIMATING VERTICAL HYDRAULIC CONDUCTIVITY (KV) IN SEMI-ARID BASINS IS CHALLENGING BECAUSE LITHOLOGICAL HETEROGENEITY LIMITS THE REPRESENTATIVENESS OF SPARSE HYDRAULIC MEASUREMENTS. THIS STUDY EVALUATES A SURFACE-BASED SEISMOELECTRIC WORKFLOW FOR INFERRING DEPTH-RESOLVED K V PROFILES WITHOUT USING DRILLING INFORMATION DURING MODEL DEVELOPMENT. BOREHOLE DATA WERE RESERVED FOR EXTERNAL VALIDATION. THE WORKFLOW INTEGRATES FIELD ACQUISITION, GEOSPATIAL DATA SYNTHESIS, SIGNAL CONDITIONING, PHYSICALLY GUIDED FEATURE ENGINEERING, SUPERVISED REGRESSION BENCHMARKING, AND HYDROGEOLOGICAL EXPERT APPRAISAL. ITS MAIN CONTRIBUTION IS A DRILLING-INDEPENDENT MODELING STRATEGY THAT TRANSLATES SURFACE SEISMOELECTRIC ATTRIBUTES INTO VERTICAL K V PROFILES. THIS PROVIDES PRE-DRILLING INFORMATION FOR WELL SITING, SCREEN-INTERVAL DESIGN, AND PLANNING OF DRILLING AND COMPLETION COSTS. A HIGH-DENSITY SURVEY WAS CONDUCTED IN THE ÑUBLE REGION OF CENTRAL CHILE USING A DUAL-CHANNEL SEISMOELECTRIC SYSTEM WITH INVESTIGATION DEPTHS OF UP TO 200 M. MORE THAN 500 GEOREFERENCED STATIONS WERE ACQUIRED. SEISMOELECTRIC ATTRIBUTES DERIVED FROM THE DUAL-CHANNEL RESPONSE, TOGETHER WITH TOPOGRAPHIC DESCRIPTORS, WERE USED TO TRAIN AND COMPARE MULTIPLE REGRESSION MODELS. COMPARED WITH A BASELINE CONFIGURATION BASED ONLY ON RAW VOLTAGE AND DEPTH, THE AUGMENTED MODEL SHOWED STRONGER CROSS-VALIDATED PERFORMANCE. THE COEFFICIENT OF DETERMINATION INCREASED FROM R 2 = 0.711 TO R 2 = 0.968 , RMSE DECREASED FROM 3.534 TO 1.305 M/D, AND MAE DECREASED FROM 1.368 TO 0.546 M/D. THE PREDICTED K V PROFILES BETTER PRESERVED PERSISTENT HIGH- AND LOW-CONDUCTIVITY INTERVALS AND ABRUPT VERTICAL TRANSITIONS THAN THE BASELINE MODEL. THEY WERE ALSO CONSISTENT WITH INDEPENDENT LITHOSTRATIGRAPHIC EVIDENCE AND POST-DRILLING YIELD VERIFICATION AT THE VALIDATION SITE. PROFILE-LEVEL SMOOTHING WITH SAVITZKY–GOLAY AND WAVELET FILTERS IMPROVED VISUAL CONTINUITY WHILE PRESERVING THE DOMINANT CONDUCTIVITY CONTRASTS. THESE RESULTS
dc.formatapplication/pdf
dc.identifier.doi10.1016/j.acags.2026.100377
dc.identifier.issn2590-1974
dc.identifier.urihttps://repositorio.ubiobio.cl/handle/123456789/14356
dc.language
dc.publisherApplied Computing and Geosciences
dc.relation.uri10.1016/j.acags.2026.100377
dc.rightsOPEN ACCESS
dc.subjectSeismoelectric method
dc.subjectVertical hydraulic conductivity
dc.subjectHydrogeophysics
dc.subjectMachine learning
dc.subjectFeature engineering
dc.subjectSubsurface mapping
dc.subjectDataset Zenodo
dc.titleTOWARDS SURFACE-BASED HYDRAULIC CONDUCTIVITY MAPPING USING SEISMOELECTRIC SIGNALS AND DATA-DRIVEN MODELS
dc.typeARTÍCULO
dspace.entity.typePublication
oaire.fundingReferenceANID- AGENCIA NACIONAL DE INVESTIGACIÓN Y DESARROLLO (EX CONICYT)
oaire.fundingReferenceUBB- UNIVERSIDAD DEL BÍO-BÍO
oaire.fundingReferenceANID- AGENCIA NACIONAL DE INVESTIGACIÓN Y DESARROLLO (EX CONICYT)
oaire.licenseConditionCC BY 4.0
ubb.EstadoPUBLICADA
ubb.Otra ReparticionDEPARTAMENTO DE FISICA
ubb.Otra ReparticionDEPARTAMENTO DE FISICA
ubb.Otra ReparticionDEPARTAMENTO DE INGENIERIA INDUSTRIAL
ubb.SedeCONCEPCIÓN
ubb.SedeCONCEPCIÓN
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