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WSGS Geophysical and Explorations Group

Yuri Ganshin Ph.D.
Geologist: Exploration Geophysics
Geophysical Modeling, Seismic Interpretation
(307) 766-2286 Ext. 251
yganshin@uwyo.edu

SEISMIC ATTRIBUTES

Seismic attributes are the quantities mathematically derived from pre-stack and post-stack seismic data. In many cases, they are more closely related to physical rock properties than to conventional seismic amplitudes. Properly chosen seismic attributes highlight specific petrophysical/geologic parameters such as lithology, fluid content, and degree of fracturing. Analysis of 3D seismic data with several types of seismic attributes may reveal the geologic factors that control the spatial distribution of subsurface energy reserves, as in the examples shown below.

Flattened horizon of interval velocity cube, derived from continuous velocity analysis		Flattened horizon of apparent dip cube, derived from post-stack volume analysis

The Geophysical and Exploration Group twofold:

The geophysical and exploration group compiles geophysical data for the state of Wyoming and provides geophysical support to energy-related industries in Wyoming.

When compiling geophysical data, the group gives priority to seismic 2D and 3D surveys processed using commercial and in-house techniques. These techniques include innovative seismic velocity/frequency analyses that result in better understanding and imaging of the subsurface geology, hydrocarbon resources, and physical features of the state. The Wyoming State Geological Survey welcomes any donated seismic data sets acquired in Wyoming, and will re-process and re-interpret the data using in-house facilities. This data compilation will allow the WSGS to create catalogues of interpreted seismic data for each of Wyoming's oil-and-gas-producing basins. The catalogues will include 2D sections and 3D volumes with variable seismic attributes. At the locations with well control, these attributes will be correlated with geophysical logs. Using the catalogues, explorationists can select the attributes that will allow them to delineate hydrocarbon reserves with more certainty.