Journal ArticleDOI
Regional Fractures II: Fracturing of Mesaverde Reservoirs in the Piceance Basin, Colorado (1)
John C. Lorenz,Sharon J. Finley +1 more
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TLDR
In this paper, a regional set of west-northwest extension fractures was observed in abundant vertical and deviated core from the U.S. Department of Energy's Multiwell Experiment and Slant Hole Completion Test wells.Abstract:
Cretaceous strata in the east-central Piceance basin of northwestern Colorado were subjected to several phases of stress due to horizontal tectonic compression, burial, and uplift. These rocks contain a regional set of west-northwest extension fractures, observed in abundant vertical and deviated core from the U.S. Department of Energy's Multiwell Experiment and Slant Hole Completion Test wells. Time-depth relationships, fracture orientation, and fluid inclusion analyses indicate that the fractures formed at about 36-40 Ma, during a phase of increased Laramide west-northwest compression, and in a pressure-temperature regime compatible with the geologically reconstructed maximum burial depths. This regional fracturing is an example of load-parallel extension fracturing and basinwide dilatancy at depth, under conditions of high pore pressure and anisotropic, tectonically created, horizontal stress.read more
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Sublinear scaling of fracture aperture versus length: An exception or the rule?
TL;DR: In this paper, a nonlinear aperture-to-length relationship is derived, still based on linear elastic fracture mechanics in a homogeneous body, but incorporating subcritical and critical (equilibrium law) fracture propagation criteria.
Journal ArticleDOI
Fractures in sandstone reservoirs with ultra-low permeability: A case study of the Upper Triassic Yanchang Formation in the Ordos Basin, China
Zeng Lianbo,Li Xiang-Yang +1 more
TL;DR: In this article, the authors studied the effect of different successive tectonic stress fields on the formation of high-angle tectonics in the Upper Triassic Yanchang Formation in the Ordos Basin.
Journal ArticleDOI
Scaling relationships of joint and vein arrays from The Burren, Co. Clare, Ireland
TL;DR: In this paper, a study of the systematics of veins and joints in Carboniferous limestones of The Burren, Ireland is presented, where scaling relationships were established for fracture arrays mapped from low elevation aerial photographs that image fractures on numerous limestone pavements for areas up to ca 1 km2.
Journal ArticleDOI
Prediction of lithofacies and reservoir quality using well logs, Late Cretaceous Williams Fork Formation, Mamm Creek field, Piceance Basin, Colorado
TL;DR: In this paper, the authors identify 12 lithofacies based on sand-grain populations, cement types, and clay matrix content, and show that careful petrographic assessment of the heterogeneity can be upscaled by correlation with log properties to yield tools for field-scale reservoir quality prediction.
Journal ArticleDOI
Testing the basin-centered gas accumulation model using fluid inclusion observations: Southern Piceance Basin, Colorado
András Fall,Peter Eichhubl,Stephen P. Cumella,Robert J. Bodnar,Stephen E. Laubach,Stephen P. Becker +5 more
TL;DR: The basin-centered gas accumulation model was applied to the Piceance Basin by determining the timing of fracturegrowth and associated temperature, pressure, and fluid-composition conditions using microthermometry and Raman microspectrometry of fluid inclusions trapped in fracture cement that formed during fracture growth as discussed by the authors.
References
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Fundamentals of rock mechanics
John Conrad Jaeger,N. G. W. Cook +1 more
TL;DR: In this article, Mecanique des roches and Analyse des contraintes were used to construct Elasticite Reference Record (ER) and Elasticite reference record (ER).
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Experimental Deformation of Sedimentary Rocks Under Confining Pressure: Pore Pressure Tests
TL;DR: In this article, a triaxial compression test was conducted on various types of porous rocks, including Beerea sandstone, Marianna limestone, Hasmark dolomite, Repetto siltstone, and Muddy shale, in which the external confining pressures and internal pore pressures were measured independently.
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The great transgressions of the Late Cretaceous
J. M. Hancock,E. G. Kauffman +1 more
TL;DR: Facies analysis in both the Western Interior of the USA and in NW Europe reveals simultaneous major oscillations in sea level that controlled the principal transgressions and regressions except in regions of rapid contemporaneous tectonics.
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Contemporary tectonics and seismicity of the Western United States with emphasis on the Intermountain Seismic Belt
Robert B. Smith,Marc L. Sbar +1 more
TL;DR: In this paper, a comparison of the calculated and observed rates of the motion for the Yellowstone plume with respect to that for the North American plate was made, and it was concluded that the Yellowstone plate has remained stationary relative to the Hawaiian plume.