Structural domains
Definition
A structural domain is an areally distinct region or subregion with similar structural properties (e.g., similar fold vergence or style, shortening, uplift, faulting style, etc.).
Identifying structural domains
Once a prospective tectonic setting is identified, we can determine where to focus exploration within that setting. This can be done most effectively by defining the boundaries and internal structural character of the different structural domains within the tectonic setting.
Among different tectonic settings, the number and complexity of the structural domains can vary significantly. For example, the number and character of the structural domains defined in a basin forming in the cratonic interior in a relatively quiet but long-lived tectonic setting contrast significantly to those defined in a short-lived but intense rifting event.
Tools to define structural domains
Within a particular tectonic setting, a significant number of markedly different domains may exist. Our ability to define the domains depends on the data available and the scale of observation. The following data sources can help define the boundaries and describe the internal complexity of structural domains:
- Potential fields
- Satellite imagery and/or aerial photography (See Remote sensing.)
- Regional surface and subsurface geologic data
- Exploration seismic data
- Deep crustal seismic data
- Reconnaissance outcrop studies
Assessing potential
Once the structural domain is defined and described, we must assess its potential to satisfy the play concept criteria. Some of the more obvious issues center around structural style:
- Fold styles
- Fault–fold relationships
- Fault spacing and interaction
- Fault fabrics
- Fault scaling
- Shortening–uplift ratios
Characterizing the structural domains lets us look at specific domains relative to the hydrocarbon system and thereby identify prospective structural fairways.
See also
External links
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