HR: 1330h
AN: S22B-0453    [PDF]
TI: Measuring Quality Factors From Multicomponent Reflection Seismic Data and its Significance for Lithology and Fluid Type Prediction
AU: * Ortiz-Osornio, M
EM: mortizo@imp.mx
AF: Insituto Mexicano del PetrĒleo, Eje Central Lazaro Cardenas No. 152, Mexico, D.F CP 07730 Mexico
AU: * Ortiz-Osornio, M
EM: mortizo@imp.mx
AF: DEPFI-UNAM, Ciudad Universitaria s/n, Mexico, D.F 04510 Mexico
AU: CalderĒn-Macias, C
EM: ccaldero@imp.mx
AF: Insituto Mexicano del PetrĒleo, Eje Central Lazaro Cardenas No. 152, Mexico, D.F CP 07730 Mexico
AU: Ramos-Matinez, J
EM: jmartin@imp.mx
AF: Insituto Mexicano del PetrĒleo, Eje Central Lazaro Cardenas No. 152, Mexico, D.F CP 07730 Mexico
AB: Relationships among shear and compressional wave velocities (VP and VS) and quality factors (QP and QS) for predicting lithology and fluid content, have been previously studied and proposed by some researchers. Thus, for example, VP/VS has been used as a lithology indicator for sandstone, shale and limestone. Likewise, QP/QS has been related to fluid content, mainly to discriminate oil, brine, and gas saturation. The velocities and quality factors for both P and S waves can be obtained from multicomponent reflection seismic data. Multicomponent data are most commonly recorded from compressional sources in the oil industry. Converted P to S waves or PS waves are generally measured in the radial component. In cases where there are heterogeneity and/or azimuthal anisotropy, the transverse component is also considered. Processing of the converted wave results in a PS image and an interpreted converted-wave velocity field (VPS). Likewise, it is possible to estimate a converted-wave quality factor (QPS) field. The converted-wave quality factor can also be used as a lithology and fluid content indicator since this parameter depends on VP/VS and QP/QS ratios. Crossplots involving QPS obtained from previously published laboratory measurements of P- and S-wave velocities and quality factors, reveal the significance of estimating QPS from multicomponent seismic data. An important advantage of using QPS as a lithology indicator is that it can be mapped directly from multicomponent surface seismic data. In this work we present a new methodology to obtain QPS. In the pure mode case, approaches for estimating Q are well known. However for converted-waves, some simplifying assumptions need to be made due to the propagation characteristics of the converted P- to S-wavepath.
UR: http://www.imp.mx/investigacion/ynf/smc/
DE: 0935 Seismic methods (3025)
DE: 5144 Wave attenuation
SC: Seismology [S]
MN: 2003 Fall Meeting