Seismic Reservoir Delineation using DHI Analysis

With increasing availability of high quality seismic data, the search for and use of Direct Hydrocarbon Indicators (DHIs) during any exploration campaign has become commonplace.

Direct hydrocarbon indicators (DHI) could be a very useful to identify the hydrocarbon, specially the gas presence, also it will be supported by the conventional full bandwidth seismic attributes, which will be a powerful tool to delineate the channel “reservoir” architecture. Sometimes the DHI & seismic attributes are not enough to identify the channel “reservoir” architecture, so, another tool which will use a specific bandwidth for the seismic data spectrum will be used to identify the channel architecture.

Over the years, spectral decomposition analysis “specific bandwidth” of seismic data has progressed from being a tool for stratigraphy analysis to helping in Direct Hydrocarbon Indicator (DHI) definition; a potential weapon for reducing dry well drilling. In the coming years, it is expected that spectral decomposition may be able to play a significant role in analyzing time lapse seismic data.

Study workflow will be as follow:
• Seismic data interpretation “structural & stratigraphic” for the channel “reservoir” top and base.
• Direct hydrocarbon indicators (DHI) analysis over top and base reservoir.
• Seismic attributes screening to delineate the channel architecture.
• Applying different full bandwidth seismic attributes over top and base reservoir to fully delineate the channel architecture.
• Applying a specific bandwidth spectral decomposition analysis over the seismic cube.
• Generating different frequency banded seismic cubes from the full spectrum seismic cube.
• RGB color blending different frequency banded seismic cubes to get the optimum cubes to be used for identifying the channel architecture “horizon based or cube based”.
• Integrating both “full bandwidth seismic attributes with specific bandwidth spectral decomposed seismic cubes” to identify and delineate the channel architecture “Top & Base”.