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This calculation is usually done with the more accurate Fatti equation.
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This attribute works well for Class 2 and 3 AVO responses (Ross, 2002).ĭerived Attributes Scaled S-wave Reflectivity : aA-bB The AVO difference (A-B) shows an increase in Shear Impedance at the top of the reservoir, which can be indicative of hydrocarbons. This attribute works well for a class 3 AVO response.ĭerived Attributes Scaled Poisson’s Ratio Change : aA+bB The AVO sum (A+B) shows a negative response at the top of the reservoir (a decrease in σ) and a positive response at the base (an increase in σ) indicating hydrocarbon-charged sands. The AVO product shows a positive response at the top and base of the clastic reservoir, which can indicate the presence of hydrocarbons. We normally display the AVO attribute volume in color.
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The AVO Attribute volumes are stored as SEG-Y files.AVO attributes are valuable when used in conjunction with other geophysical and geological inputs for reservoir modeling and characterization. The goal is to identify hydrocarbon anomalies in the reservoir.AVO attribute volumes allow you to measure a subset of the velocity-corrected gather to determine the zero-offset (intercept) and gradient components of the amplitude at a given time sample.
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The geophysicist has full control and understanding of the conditioning processes applied, and therefore greater confidence in the results of the subsequent reservoir characterization.AVO Attribute Volume Hampson-Russell’s Software HRS9 Houston, Texas 2011 HampsonRussell Software includes a ready-made workflow containing the most frequently used gather conditioning processes, but the user has complete control over the workflow steps and parameters and can choose to add additional processes, for example, an offset scaling step. When input to processes such as AVO analysis, the conditioned gathers will result in more accurate and reliable results than the input of unconditioned gathers. Gather Conditioning removes noise, provides consistent fold, time-aligns reflection events and can be used to correct the background amplitude decay with offset calibrated using synthetic gathers generated from well logs. Improve Gather Data for Pre-Stack Analysis This specialized set of applications within HampsonRussell improves the signal-to-noise ratio and alignment of CDP gather data in preparation for any prestack analysis process such as AVO or simultaneous inversion.