Stable isotope evidence for depositional cycles and diagenetic patterns in Brushy Canyon and Cherry Canyon formations, Delaware basin, west Texas
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5062969
A stable isotope study on two cores from the Brushy Canyon Formation and three cores from the Cherry Canyon Formation of the Delaware basin reveal distinct delta/sup 18/O isotopic differences in the carbonate matrix of these two clastic facies. The delta/sup 18/O isotopic values in the two Brushy Canyon cores are similar, regardless of whether the cores are from an overbank or channel part of the deep-water fan complex. The three Cherry Canyon cores are considerably more enriched in delta/sup 18/O than the Brushy Canyon cores, i.e., some values exceed +100 per mil relative to PDB. The delta/sup 18/O record of the three cores appears to correlate regionally with both isotopic composition and the geophysical logs. The extremely enriched delta/sup 18/O values (> +30 per mil) in the Cherry Canyon directly correspond to the fine to medium siltstones. The fine to medium sandstones represent a relatively depleted delta/sup 18/O isotopic signal of less than +30 per mil. The large delta/sup 18/O contrast between the Brushy Canyon and Cherry Canyon basinal clastics suggests that changes in sea level, combined with possible wind-blown clastic and evaporitic materials from back-reef lagoonal environments, could enhance the distinct isotopic differences of the two clastic facies. Although diagenesis is part of the isotopic signal of the carbonate matrix of both basinal clastic facies, the effects of diagenesis have not totally eliminated the primary isotopic signal due to the depositional processes of the two clastic facies.
- Research Organization:
- Univ. of South Carolina, Columbia
- OSTI ID:
- 5062969
- Report Number(s):
- CONF-860624-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:5
- Country of Publication:
- United States
- Language:
- English
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Conference
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· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5866467
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Conference
·
Fri Sep 01 00:00:00 EDT 1989
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:5499407
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Conference
·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:7262382