O.T. Technical Lecture: Henry Posamentier, Senior Geological Advisor with Chevron Energy Technology Company
|Date||March 1, 2013|
|Time||3:00 - 4:00 pm|
|Description||Integration of Seismic Stratigraphy and Seismic Geomorphology for Prediction of Lithology; Applications and Workflows|
As high-quality 3D seismic data has become widely available, stratigraphic interpretation has significantly improved our ability to predict the subsurface distribution of lithologies. Stratigraphic interpretation of seismic data involves the integration of stratigraphy and geomorphology, with integrated section and plan view images yielding robust interpretations of stratigraphic architecture and associated lithology. With the investment of billions of dollars in acquisition and processing of seismic data, maximizing the value of that investment by extracting as much information from these data is business critical.
Seismically-derived geologic interpretations can have significant impact on exploration and production in the following ways:
Geology: 1) prediction of lithology, 2) prediction of compartmentalization , 3) development of depositional analogs, 4) Enhanced understanding of geologic processes. Through a variety of techniques, it is possible, in many instances, to image significant parts of depositional systems. Components of depositional systems, i.e., depositional elements such as channels, patch reefs, etc., are then identified and yield insights as to the lithology of these deposits. Subsequently, further analysis can provide insights as to stratigraphic compartmentalization.
Geophysics: 1) provides depositional context for geophysical analyses (e.g., DHI analysis, reservoir properties from seismic), and 2) quality control for geophysical processing. Understanding geologic context can provide a “reality check” when evaluating geophysical data for rock and fluid properties. In addition, iteratively evaluating the effects of geophysical reprocessing on geologic (i.e., stratigraphic and geomorphologic) features so that such features are not processed out of the data, is critical to maximizing the value of seismic data.
Key aspects of successful application of seismic stratigraphic analysis are: 1) integrating section and plan views in an iterative workflow, 2) understanding and recognizing geologically-meaningful patterns both in section and plan view, and 3) having efficient and creative workflows to quickly analyze geophysical data.
|Publisher||Department of Geosciences|
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