Caprock Characterization For Carbon Dioxide Storage In Reservoirs Using An Integrated Approach
Authors
Jefimov, Konstantin ; Krebsas, Paulius
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Pages
151
Abstract
Denne afhandling undersøger de petrofysiske (bjergarts- og væskeegenskaber) og geomekaniske (hvordan bjergarter deformeres og brister) forhold i Tensleep-formationen i Teapot Dome-feltet, Natrona County, Wyoming, USA. Målet er at finde den mest egnede brøndplacering til injektion af CO2 som led i kulstofopsamling og -lagring (CCS). Vi fokuserer på forhold, der styrer integriteten af dæklaget, det forseglende bjergartslag som skal holde CO2 sikkert inde. Hovedparten af analysen udføres med to Schlumberger-platforme. Techlog integrerer brønddata i sammenhængende arbejdsgange. Petrel bruges til brøndkorrelation, seismisk fortolkning, reservoirmodellering og volumeberegninger. Samlet anvendes de til at samle og fortolke de tilgængelige brønd-, seismiske og reservoirdata. Brøndudvælgelsen sker i tre trin. For det første udarbejdes sprødheds-duktilitets-kort for dæklaget ved at krydsplotte Youngs modul og bulkmodul, to mål for bjergarternes stivhed. Det peger på, hvor dæklaget sandsynligvis vil deformeres uden at revne (duktilt) eller lettere kan sprække (sprødt). For det andet estimeres HCPV (hydrocarbon pore volume), en standardopgørelse af hvor meget porerum i reservoiret der er fyldt med kulbrinter, for at belyse kapacitet og injektionsrammer. For det tredje sammenstilles resultaterne under seks sæt begrænsninger, hvilket giver en række mulige scenarier, hvorfra den mest egnede brønd kan vælges.
This thesis examines the petrophysical (rock and fluid properties) and geomechanical (how rocks deform and fail) characteristics of the Tensleep Formation in the Teapot Dome field, Natrona County, Wyoming, USA. The goal is to identify the most suitable well location for injecting CO2 as part of carbon capture and storage (CCS). The work focuses on factors that control the integrity of the caprock, the sealing rock layer that must keep injected CO2 contained. Most of the analysis uses two Schlumberger software platforms. Techlog integrates wellbore data into consistent workflows. Petrel supports well correlation, seismic interpretation, reservoir modeling, and volume calculations. Together, they are used to compile and interpret the available well, seismic, and reservoir data. The well-selection workflow has three steps. First, we build ductility–brittleness maps for the caprock by cross-plotting Young’s modulus and bulk modulus, two measures of rock stiffness. This indicates where the caprock is more likely to deform safely (ductile) or to fracture (brittle). Second, we estimate HCPV (hydrocarbon pore volume), a standard measure of how much reservoir pore space is filled with hydrocarbons, to frame capacity and injection considerations. Third, we combine these results under six sets of constraints to generate possible scenarios, from which the most suitable well can be chosen.
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