Fluid invasion effects on sonic interpretation

Han, D-h; Batzle, Michael

doi:10.1190/1.1885889

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The mixing type was informed by field observations of velocity-saturation relationships for CO 2 storage in saline aquifers (Caspari et al, 2011). Fluid properties at in-situ conditions were computed using the FLAG fluid calculator (Han & Batzle, 2014). Constraints on time shifts and relative velocity change can also be derived from analogue datasets such as those published in MacBeth et al, 2019.…”

Section: Amplitude and Time Shift Attributesmentioning

confidence: 99%

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

Bukar,

Bell,

Muggeridge

et al. 2024

Preprint

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Large scale underground storage of CO2 is being deployed worldwide to reduce greenhouse gas emissions to the atmosphere. Modelling studies have investigated the possible risks from the CO2 migrating along faults, but this has not yet been observed. We were able to identify such CO2 migration at a commercial-scale, demonstration CO2 storage project, the Illinois Basin - Decatur Project, including subsequent emergence of the CO2 into overlying permeable layers. Our interpretation resolves previous inconsistencies observed at the project and provides a rare field observation the fluid dynamics of CO2 moving between faults and reservoir lithology. The project had deployed time-lapse 3D vertical seismic profile imaging to study CO2 plume development, interpreted based on the commonly used amplitude attributes. However, factors including survey repeatability, subtle seismic fluid effects and irregular filling of the storage reservoir by CO2 meant that amplitude anomalies due to CO2 were not distinct. Here we apply an alternative interpretation technique to the data based on time shift attributes, resulting in much clearer plume anomalies. This work provides field validations of previously theorised plume behaviours and demonstrates the use of an alternative analysis technique to overcome challenges in interpretation of seismic monitoring data for geological CO2 storage.

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Section: Amplitude and Time Shift Attributesmentioning

confidence: 99%

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

Bukar,

Bell,

Muggeridge

et al. 2024

Preprint

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Estimating elastic properties of sandstone reservoirs using well logs and seismic inversion

Quijada¹

2009

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Seismic signatures of partial saturation on acoustic borehole modes

2007

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We present an exact theory of attenuation and dispersion of borehole Stoneley waves propagating along porous rocks containing spherical gas bubbles by using the Biot theory. An effective frequency-dependent fluid bulk modulus is introduced to describe the dynamic ͑oscillatory͒ behavior of the gas bubbles. The model includes viscous, thermal, and radiation damping. It is assumed that the gas pockets are larger than the pore size, but smaller than the wavelengths involved ͑mesoscopic inhomogeneity͒. A strong dependence of the attenuation of the Stoneley wave on gas fraction and bubble size is found. Attenuation increases with gas fraction over the complete range of studied frequencies ͑10 Hz-50 kHz͒. The dependence of the phase velocity on the gas fraction and bubble size is restricted to the lower frequency range. These results indicate that the interpretation of Stoneley wave properties for the determination of, for example, local permeability formation is not straightforward and could be influenced by the presence of gas in the near-wellbore zone. When mudcake effects are included in the model, the same observations roughly hold, though dependence on the mud-cake stiffness is quite complex. In this case, a clear increase of the damping coefficient with saturation is predicted only at relatively high frequencies.

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Fluid invasion effects on sonic interpretation

Cited by 4 publications

References 5 publications

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

Estimating elastic properties of sandstone reservoirs using well logs and seismic inversion

Seismic signatures of partial saturation on acoustic borehole modes

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