What is post-stack inversion?

Poststack inversion methods generally refer to the various workflows used to transform stacked seismic data into quantitative rock physics parameters. From poststack inversion, the outcome is usually acoustic impedance, whereas prestack inversion may result in both acoustic impedance and shear impedance.

What is seismic inversion method?

In geophysics (primarily in oil-and-gas exploration/development), seismic inversion is the process of transforming seismic reflection data into a quantitative rock-property description of a reservoir.

What is the advantage of performing seismic inversion?

Compared to working with seismic amplitudes, inversion results show higher resolution and support more accurate interpretations. This in turn facilitates better estimations of reservoir properties such as porosity and net pay.

What is post-stack seismic data?

Post-stack seismic inversion utilizes post-stack seismic data along with well log data to estimate acoustic impedance. Post-stack seismic inversion is very fast compared to other pre-stack seismic inversion methods and provides a high-resolution subsurface image.

What is seismic stacking?

The problem of combining a collection of seismic traces into a single trace is commonly referred to as stacking in seismic data processing. This process is used to attenuate random noise and simultaneously amplify the coherent signal in the gather.

What is pre-stack inversion?

Pre-stack inversion can be used when post-stack inversion fails to sufficiently differentiate geologic features that have similar P-impedance signatures. It makes use of amplitude versus offset information and inverts offset gathers for P-impedance, S-impedance and density.

What is elastic inversion?

Elastic inversion provides an estimate of elastic parameters by the use of Amplitude Variations with Angle data. This information gives the geoscientist additional parameters for the interpretation of lithology, porosity and fluid type.

What is P impedance?

P-impedance= density *P-velocity. S-impedance= density*S-velocity. Note that all other attributes can be calculated from the impedance. From well log data we used density and velocity data to get the impedance and the Poisson’s ratio.

What is pre stack seismic data?

Pre-stacking inversion changes seismic into P-impedance, S-impedance, and density by integrating well and seismic data. Pre-stacking Inversion Workflow. Credit: Petrologic. The two techniques used on pre-stacking are: simultaneous and elastic inversion.

How is stacking done in geophysics?

A processed seismic record that contains traces that have been added together from different records to reduce noise and improve overall data quality. The number of traces that have been added together during stacking is called the fold.

What are the post-stacking methods of seismic inversion?

The post-stacking methods are colored inversion, model-based inversion, sparse spike inversion and Band-limited impedance inversion. Colored Inversion (CI) is a process to approximately match or convolve the amplitude spectrum of a seismic with the acoustic impedance spectra issued from well data.

What is poststack inversion?

Poststack inversion transforms a single seismic data volume into acoustic impedance through integration of seismic data and well data. The benefits of acoustic impedance obtained after inversion are well established for stratigraphic interpretation in comparison to conventional seismic data analysis.

What are the different types of seismic inversion?

The seismic inversion techniques can be divided into two broad categories: Pre-stack and Post-stack inversion. The first approach in the seismic inversion is the most commonly used where the effect of the wavelet is removed from the seismic data and a highresolution image of the – subsurface is produced [16].

Is seismic inversion a useful tool in reservoir characterization?

Seismic inversion-a critical tool in reservoir characterization. Scandinavian oil -gas magazine, 5(6):19{22. [22]. Russell, B. (1999). Comparison of poststack seismic inversion methods.