What is AVO?
In a nutshell, AVO is a way of high-grading brightspots on your seismic sections and of finding subtle anomalies that can be lost in run-of-the-mill CDP stacking and migration. It stands for Amplitude Versus Offset and is something of a misnomer since we typically look at seismic reflection amplitude as a function of incidence angle rather than source-receiver offset. However, the acronym AVO has been in use for a long time and it's probably futile for anyone to try to change it now.
AVO can help to answer the question of whether that amplitude anomaly you see on the workstation screen is due to 50 feet of gas or 50 feet of tight carbonate cement, or coal, or salt, or the top of overpressure, or ....
It may be riskier out there than
Whether you use bright spots, flat spots, dim spots, frequency anomalies, attenuation anomalies or AVO you can't escape risk. Risk is usually seen as the probability of drilling a dry hole but there is also the risk of passing over a profitable discovery. It can be risky to limit your use of technology. You don't escape it by simply making "conservative" drilling decisions. Over the long run, prudent use of technology can reduce the risk inherent in estimating reserves.
Dealing with risk - How AVO
An AVO Checklist
Consider the following points with respect to your project area: