Seismic attributes, and CT scans in Hyrdocarbon-reservoir characterization: reservoir petrophysical facies signatures, Wellington Field, Kansas, USA
Abstract
Located in the northern segment of the Sedgwick Basin of south-central Kansas, the Wellington Field has produced over 20 million bbl of oil from the Mississippian age (Cowley Formation) dolomite reservoir. Wellington Field Mississippian carbonate reservoir is undergoing renewed reservoir characterization effort, for enhanced tertiary oil recovery and CO2-sequestration, to understand the seismic signatures of the variation of petrophysical properties. This study focuses on integrating the analysis of seismic facies attributes with petrophysical well-logs and CT-scan imaging to understand the effects of pore-space architecture and porosity variation of the carbonate reservoir rocks. Integration of seismic attributes facies classification, based on unsupervised artificial neural network (ANN), with CT-scan of the pore-space resulted in realization of the role of pore-shape and porosity variation in defining classes of seismic facies. This study established a reliable relationship of acoustic impedance to porosity with important implications to enhancing reservoir modeling as well as enabling prediction of field-scale porosity prediction. The conducted computer tomography (CT) imaging provided porosity architecture data that highlighted the impact of pore-shape on seismic signature of reservoir petrophysical facies. The pore structure varies from fractures that cut through the host rock (dolomite) while the inter-crystal porosity is contained by the digenetic processes of chert at the top of the reservoir. The bottom of the reservoir is dominated by fracture porosity that intrudes host rock (dolomite) and diagenetic processes of chert.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.S31E0580R
- Keywords:
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- 0599 General or miscellaneous;
- COMPUTATIONAL GEOPHYSICS;
- 0999 General or miscellaneous;
- EXPLORATION GEOPHYSICS;
- 7290 Computational seismology;
- SEISMOLOGY;
- 7299 General or miscellaneous;
- SEISMOLOGY