scholarly journals Section A-A'; surface and subsurface correlations of some Upper Cretaceous and Tertiary rocks, Green River basin, Wyoming

1979 ◽  
Author(s):  
B.E. Law ◽  
C.W. Spencer ◽  
Henry W. Roehler
Keyword(s):  
River Basin ◽  
Upper Cretaceous ◽  
Green River Basin ◽  
Green River

scholarly journals Fracture porosity creation and persistence in a basement-involved Laramide fold, Upper Cretaceous Frontier Formation, Green River Basin, USA

2016 ◽  
Vol 153 (5-6) ◽  
pp. 887-910 ◽  
Author(s):  
STEPHEN E. LAUBACH ◽  
ANDRÁS FALL ◽  
LAUREN K. COPLEY ◽  
RANDALL MARRETT ◽  
SCOTT J. WILKINS
Keyword(s):  
Fluid Inclusion ◽  
River Basin ◽  
Upper Cretaceous ◽  
Great Depth ◽  
High Angle ◽  
Green River Basin ◽  
Green River ◽  
Considerable Uncertainty ◽  
Frontier Formation ◽  
Current Maximum

AbstractFracture-hosted porosity and quartz distribution along with crack-seal texture and fluid inclusion assemblage sequences in isolated, bridging quartz deposits show that open fractures can persist through protracted burial and uplift in foreland basins. Fractures oriented at a high angle to current maximum compressive stress remain open and were weak mechanical discontinuities for millions of years even at great depth. Upper Cretaceous Frontier Formation sandstones in the basement-involved (Laramide) Table Rock anticline, eastern Greater Green River Basin, Wyoming sampled by two horizontal wells (cut parallel or nearly parallel to bedding and at a high angle to steeply dipping fractures) have 41.5 m of rock in four cores at depths of 4538–4547 m. Cores intersect older E-striking Set 1 fractures are abutted by or locally cross-cut by N-striking Set 2 fractures. Both sets contain quartz and porosity. Sequenced using quartz crack-seal cement texture maps, Set 1 fluid inclusion assemblage (FIA) trapping temperatures increase progressively from 140 to 165°C then decrease toc. 150°C, compatible with fracture opening overc. 15 Ma during rapid burial followed by uplift in Eocene–Oligocene time. Set 2 opened atc. 160°C, probably near maximum burial. After a period of quiescence, Set 2 reopened atc. 5 Ma atc. 140°C, on a cooling trajectory. Intermittent Set 2 movement could reflect local basement-involved fault movement, followed after a pause by further Set 2 reactivation in the modern stress field during uplift. Interpretations are sensitive to available burial/thermal histories, which have considerable uncertainty.

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