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Determination of Heterogeneity by High-Resolution Seismic Reservoir Characterization in the Heavy Oil Temblor Reservoir of Coalinga Field, California

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dc.contributor.authorMahapatra, Sailendra Nathen
dc.contributor.committeechairImhof, Matthias G.en
dc.contributor.committeememberChapman, Martin C.en
dc.contributor.committeememberEriksson, Kenneth A.en
dc.contributor.committeememberCastle, James W.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2014-03-14T20:17:41Zen
dc.date.adate2005-12-12en
dc.date.available2014-03-14T20:17:41Zen
dc.date.issued2005-08-12en
dc.date.rdate2005-12-12en
dc.date.sdate2005-10-26en
dc.description.abstractThe research focuses on analysis and subsurface imaging of siliciclastics rocks on steam-affected 3D poststack seismic data, merged from different vintages, from the Temblor Formation in the Coalinga heavy oil reservoir in the San Joaquin basin, California. The objective was identification, delineation, and demarcation of reservoir heterogeneities by seismostratigraphic and seismogeomorphic analysis. The proximity of the San Andreas Transforms greatly controlled basin evolution and caused substantial reservoir heterogeneity by changing the depositional environment from shallow marine to near-shore fluvial. Moreover, two unconformities dissect the reservoir interval. The seismic dataset exhibits erratic, distorted reflection strengths and amplitudes caused by steam-injection-aided production. A petrophysical analysis based on Gassmann fluid substitution suggests a 27% P-wave velocity decrease in steam-saturated intervals. Seismic to well log ties were problematic and vexing due to the resulting statics, wavelet changes, and line mismatches. Mapping and flattening on a deeper horizon, however, allowed mapping of the internal unconformities and well ties which were crucial for seismostratigraphic sequence identification. Visualization of seismic attributes brought out stratification patterns and two distinct, laterally and vertically extensive, porous, and interconnected facies tracts interpreted as incised valley fills and tidal-to-subtidal deposits as evidenced by bright, steam related amplitudes. Seismic attribute analysis, Geobody Visualization and Interpretation, and structure and isochron maps brought out two prominent channel-systems, recut and restacked in the central part of the area. These deposits were identified on seismic data and correlated to high-gamma coarsening-upward sands on logs and cores. The deeper one, shifting towards SSE with depth, lies between the Base Temblor and Buttonbed unconformities both in the southwestern and northwestern parts of the study area and is scattered in the western-central portion. The shallower one originates in southwestern corner below the Top Temblor unconformity shifts towards ESE-SE with depth, and runs nearly parallel to the Top Temblor unconformity. It cuts across the Valv unconformity in central part creating a channel incision, and follows the Buttonbed unconformity towards the north. The investigation segmented the reservoir into channels, non-channel bearing, and unconformity-bounded subunits which will allow the operator to improve steam injection and optimize placement of oil producing infill wells.en
dc.description.degreePh. D.en
dc.identifier.otheretd-10262005-053324en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10262005-053324/en
dc.identifier.urihttp://hdl.handle.net/10919/29377en
dc.publisherVirginia Techen
dc.relation.haspartSailendra_Final_ETD.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSeismic attribute and geovolume visualizationen
dc.subjectSteam-affected merged 3D poststack seismicen
dc.subjectSeismostratigraphic and Seismogeomorphic analysien
dc.subjectMonarch sands of Monterey Formationen
dc.subjectStacked high-gamma coarsening upward sandsen
dc.subjectSan Joaquin basin and San Andreas Transformsen
dc.titleDetermination of Heterogeneity by High-Resolution Seismic Reservoir Characterization in the Heavy Oil Temblor Reservoir of Coalinga Field, Californiaen
dc.typeDissertationen
thesis.degree.disciplineGeosciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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