Seismic Attributes for Lithological Change

There are many seismic attributes that can be used for direct hydrocarbon indicators (DHI) and lithological changes. Some attributes depend on prestack data like AVO attributes, others depend on poststack data like sweetness and Q attenuation.
 

Poststack attributes can help to predict the presence of hydrocarbon and lithology change along different geobodies. Unfortunately in our case study we do not have wells information across the interested channels, but poststack attributes help for the isolation of geobodies from other not interested geological features using direct hydrocarbon indictors like average energy attribute that help in determination of the best location for prospect wells along channels
 

Most of the attributes discussed previously are defined as "Primitive" attributes. They basically measure a particular physical or geometrical condition or statistics. In spite of they are primitive; they can also be used as building blocks by combining them logically. They can be used to detect more complicated preconditions. The logic of the combination is experience and knowledge based. For example, the fluid factor computed by the AVO analysis is a hybrid attribute based on experience

Since their introduction they have been shown to be effective discriminators. There will continue in developing additional hybrid attributes as we incorporate an additional knowledge of rock physics, geology and reservoir characteristics.
It is very important to find good relation between two or three attributes that help for less risk and can help to generate new attributes. In order to combine attributes we must determine what relation between attributes, usually the use physical attributes with each other can help to follow change in lithology or we can use relation for DHI, in this case study we used both envelope and sweetness attributes and try to find good relation that can use for DHI along geobody

 

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