What is DHI in seismic?

Credit: GEO ExPro. Direct hydrocarbon indicators (DHIs) are an anomalous type of seismic amplitude that may occur due to the presence of hydrocarbons. They occur due to a change in pore fluids, which cause a change in the bulk rock’s elastic properties.

What is seismic attribute analysis?

Seismic attribute analysis involves extracting or deriving a quantity from seismic data that can be analysed in order to enhance information that might be more subtle in a traditional seismic image, leading to a better geological or geophysical interpretation of the data.

What is direct hydrocarbon indicators?

Seismic direct hydrocarbon indicators (DHIs) are anomalous seismic responses caused by the presence of hydrocarbons. DHIs occur when a change in pore fluids causes a change in the elastic properties of the bulk rock which is seismically detectable (i.e. there is a “fluid effect”).

What is flat spot in seismic interpretation?

In reflection seismology, a flat spot is a seismic attribute anomaly that appears as a horizontal reflector cutting across the stratigraphy elsewhere present on the seismic image. Its appearance can indicate the presence of hydrocarbons.

What does RMS amplitude show?

The root mean square amplitude (RMS) is a commonly used technique to display amplitude values in a specified window of stack data. With RMS amplitude, hydrocarbon indicators can be mapped directly by measure reflectivity in a zone of interest.

What is AVO seismic?

1. n. [Geophysics] Abbreviation for amplitude variation with offset. Variation in seismic reflection amplitude with change in distance between shotpoint and receiver that indicates differences in lithology and fluid content in rocks above and below the reflector.

Why is acoustic impedance important?

The acoustic impedance of an instrument for any particular fingering is one of the major factors which determines the acoustic response of the instrument in that fingering. It determines which notes can be played with that fingering, how stable they are and it also helps determine whether they are in tune.

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.

https://www.youtube.com/watch?v=LZuZ_d3C51Q