358
W. L. Watney . J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
Future studies are needed to examine the nature and timing of structural
movement and sedimentary response during contrasting periods of tectonism,
e.g., pre and post foreland basin development. Also, studies are needed to further document the levels of coherency of stratigraphy, lithofacies, and diagenesis in the SARs and refine predictive models for resource exploration.
7
Conclusions
1. High-frequency, carbonate-dominated genetic stratigraphic units (GSUs)
and genetic sets (GSs) are marine to nonmarine cycles bounded by condensed sections. Elevated natural gamma radiation of condensed sections facilitates mapping in the subsurface.
2. Regional mapping of thickness and lithofacies in GSUs and GSs provide detailed temporal (as proxies for associated depositional sequences and sequence sets) and three-dimensional spatial variations of the Kansas shelf configuration bordering the Anadarko and Arkoma basins.
3. Regionalized classification of GSU and GS thickness data is used to create geometric models of basin/shelf subdivisions recognized here as sediment accumulation regions (SARs), km-scale rhombic and arcuate-shaped crustal
blocks.
4. Color gamma-ray log cross-sections illustrate changes in stratigraphy and
lithofacies corresponding closely to SARs.
5. SARs correspond closely with magnetic and gravity anomalies and lineaments as well as Precambrian geology as determined from well control. This
suggests that the SAR boundaries are strongly influenced by Precambrian
structure, particularly reactivated basement faults.
6. Locus of major stratigraphic and lithofacies change is strongly dependent on
inferred differential, episodic subsidence. Subsidence appears to be a major
influence on the GSUs and GSs, in spite of apparent high magnitude/high frequency eustacy.
7. SAR, GSU and GS development may have significant implications in the exploration for stratigraphic traps (abrupt change in shelf configuration and stratigraphy/lithofacies) and evaluation of fluid migration routes (fracture systems).
Acknowledgements
ERMapper from Earth Resource Mapping was used for gravity and magnetic image analysis. Gravity and magnetic images were generated by Joe Kruger while
a visiting scientist at the Kansas Geological Survey. Lea Ann Davidson is thanked
for her assistance in manuscript preparation. Appreciation is extended to PfEFFER software group for support in developing color cross section module, particularly Saibal Bhattacharya. Thanks is also given to Julie Grauer, Ken Stalder,
and Dana Adkins-Heljeson for help and suggestions in experimenting with color
cross section generation.
W. L. Watney . J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
Future studies are needed to examine the nature and timing of structural
movement and sedimentary response during contrasting periods of tectonism,
e.g., pre and post foreland basin development. Also, studies are needed to further document the levels of coherency of stratigraphy, lithofacies, and diagenesis in the SARs and refine predictive models for resource exploration.
7
Conclusions
1. High-frequency, carbonate-dominated genetic stratigraphic units (GSUs)
and genetic sets (GSs) are marine to nonmarine cycles bounded by condensed sections. Elevated natural gamma radiation of condensed sections facilitates mapping in the subsurface.
2. Regional mapping of thickness and lithofacies in GSUs and GSs provide detailed temporal (as proxies for associated depositional sequences and sequence sets) and three-dimensional spatial variations of the Kansas shelf configuration bordering the Anadarko and Arkoma basins.
3. Regionalized classification of GSU and GS thickness data is used to create geometric models of basin/shelf subdivisions recognized here as sediment accumulation regions (SARs), km-scale rhombic and arcuate-shaped crustal
blocks.
4. Color gamma-ray log cross-sections illustrate changes in stratigraphy and
lithofacies corresponding closely to SARs.
5. SARs correspond closely with magnetic and gravity anomalies and lineaments as well as Precambrian geology as determined from well control. This
suggests that the SAR boundaries are strongly influenced by Precambrian
structure, particularly reactivated basement faults.
6. Locus of major stratigraphic and lithofacies change is strongly dependent on
inferred differential, episodic subsidence. Subsidence appears to be a major
influence on the GSUs and GSs, in spite of apparent high magnitude/high frequency eustacy.
7. SAR, GSU and GS development may have significant implications in the exploration for stratigraphic traps (abrupt change in shelf configuration and stratigraphy/lithofacies) and evaluation of fluid migration routes (fracture systems).
Acknowledgements
ERMapper from Earth Resource Mapping was used for gravity and magnetic image analysis. Gravity and magnetic images were generated by Joe Kruger while
a visiting scientist at the Kansas Geological Survey. Lea Ann Davidson is thanked
for her assistance in manuscript preparation. Appreciation is extended to PfEFFER software group for support in developing color cross section module, particularly Saibal Bhattacharya. Thanks is also given to Julie Grauer, Ken Stalder,
and Dana Adkins-Heljeson for help and suggestions in experimenting with color
cross section generation.