Título: | SANDSTONE SEISMIC MODELING: EFFECTS OF VELOCITY DISPERSION AND FLUID TYPE | ||||||||||||||||||||||||||||||||||||||||
Autor: |
OLGA CECILIA CARVAJAL GARCIA |
||||||||||||||||||||||||||||||||||||||||
Colaborador(es): |
SERGIO AUGUSTO BARRETO DA FONTOURA - Orientador |
||||||||||||||||||||||||||||||||||||||||
Catalogação: | 11/JUL/2008 | Língua(s): | PORTUGUESE - BRAZIL |
||||||||||||||||||||||||||||||||||||||
Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
||||||||||||||||||||||||||||||||||||||||
Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=11890&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=11890&idi=2 |
||||||||||||||||||||||||||||||||||||||||
DOI: | https://doi.org/10.17771/PUCRio.acad.11890 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
The evaluation of reservoir dynamics during production
through time-lapse
interpretation has reached a substantial importance in the
petroleum industry,
mainly in sandstones. This evaluation presents many
challenges, mainly
concerned to unmask the overlapping of different effects in
seismic data due to
reservoir changes. Several factors affect seismic
properties and saturation is one
of the most important. This property influences the rock
bulk modulus and
seismic response and also causes a velocity dependence on
the frequency. This
phenomenon is known as velocity dispersion. Furthermore,
the transition from
effective homogeneous fluid to heterogeneous saturation
represents a dispersion
mechanism that appears for seismic frequencies in situ in
sandstones. The most
commonly method used to perform the fluid substitution
technique is based in
Gassmann theory (1951). This approach considers a static
porous media (isostress
condition), where fluid is not affected by wave
propagation. However, it is well
known that acoustic velocities in fluid saturated rocks
depends on frequency,
according to fluid type and distribution on porous media,
viscosity, and others
properties that become waves dispersive. In this work
reservoir flow-simulation,
rock physics transformations, upscaling and seismic
modeling were performed in
gas injection scenarios. Synthetic seismograms and some
contrast sections were
generated using Gassmann (1951) and Mavko & Jizba (1991)
substitution
theories. The goal is to clarify the relevance of
considering velocity dispersion on
time-lapse seismic analyzing possible differences in the
seismic parameters.
Results show that seismic response could increase in 15%
when squirt flow
dispersion is considered. Porosity and tortuosity are
essential parameters to
analyze seismic response.
|
|||||||||||||||||||||||||||||||||||||||||
|