Petrography and diagenesis of Lower Cretaceous Travis Peak (Hosston) Formation, east Texas
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:7152765
Travis Peak sandstones in east Texas are fine to very fine-grained quartzarenites and subarkoses with an average composition of Q/sub 95/F/sub 4/R/sub 1/. Plagioclase feldspar is more abundant than orthoclase, and chert and low-rank metamorphic rock fragments are the most common lithic components. The first authigenic cements were clays, primarily illite, that coated detrital grains with tangentially oriented crystals. Next, extensive quartz cement (average 15.5% of the rock volume) occluded much of the primary porosity. Relatively late-stage cements include ankerite, which commonly has a dolomitic nucleus, a second-generation illite, and chlorite. Ankerite and dolomite are most abundant in marginal marine deposits near the top of the Travis Peak and are less abundant in the deeper, fluvial part of the formation. Feldspar dissolution and albitization of plagioclase were also relatively late diagenetic reactions. Plagioclase composition determined by microprobe ranges from An/sub 24/ to An/sub 0.1, but 83% of the analyses indicated a composition of less than An/sub 5/. Reservoir bitumen - a solid, immobile hydrocarbon accumulation - fills pores in sandstones in the upper 300 ft (90 m) of the Travis Peak. The volume of reservoir bitumen is as much as 19%. It has an H/C ratio of 0.79 to 0.90, suggesting that the bitumen formed by deasphalting of oil, which caused heavy molecules to precipitate. Permeability decreases with depth below the top of the Travis Peak. Porosimeter-measured porosity is the best predictor of permeability, and there is a low but statistically significant inverse correlation between total volume of cement and permeability.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 7152765
- Report Number(s):
- CONF-8610199-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:9
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diagenesis and burial history of the lower Cretaceous Travis Peak Formation, East Texas
Diagenesis and burial history of Lower Cretaceous Travis Peak Sandstone, east Texas
Controls on reservoir quality in tight sandstones of the Travis Peak formation, East Texas
Thesis/Dissertation
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Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6443411
Diagenesis and burial history of Lower Cretaceous Travis Peak Sandstone, east Texas
Conference
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Fri May 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:6048921
Controls on reservoir quality in tight sandstones of the Travis Peak formation, East Texas
Journal Article
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Mon Feb 29 23:00:00 EST 1988
· SPE (Society of Petroleum Engineers) Format. Eval.; (United States)
·
OSTI ID:7166957