Genetic Indices in Hyperpycnal Systems: A Case Study in the Late OligoceneEarly Miocene Merecure Formation, Maturin Subbasin, Venezuela

Carlos Zavala, Jose Marcano, Jair Carvajal, Manuel Delgado

AAPG Special Volumes

... anisotropy in flow velocity that results in the accumulation of fine-grained deposits in flow-margin areas (levee deposits) having similar characteristics...

Spectral Decomposition in a Heavy-oil and Bitumen Sand Reservoir

Carmen C. Dumitrescu, Larry Lines

AAPG Special Volumes

..., and (4) incorporation of AVO results into risk and reserves assessment. Some factors such as lithology, tuning, and overburden anisotropy effects have...

Fractures, Hydraulic Injections, and Strain Accommodation in the Tensleep Formation at Flat Top Anticline, Carbon County, Wyoming

John C. Lorenz

AAPG Special Volumes

... in the plane defined by the maximum and intermediate principle stresses, but if little stress anisotropy exists in poorly consolidated sands...

Seismic Geomorphology and Evolution of Submarine Channels from the Angolan Continental Margin

M.J.R. Gee, R.L. Gawthorpe, K. Bakke, S.J. Friedmann

Journal of Sedimentary Research (SEPM)

...-current overspill from the Amazon Channel: texture of the silt/sand load, paleoflow from anisotropy of magnetic susceptibility, and implications for flow...

Structure of Argentine Continental Margin

William J. Ludwig , John I. Ewing , Maurice Ewing

AAPG Bulletin

... commonly exhibit marked anisotropy with sound velocity dependent on the direction of propagation. Inhomogeneities in the layers may cause the arrivals...

Pre-Cretaceous Rocks of Northwestern Honduras: Basement Terrane in Sierra de Omoa

Gregory S. Horne , George S. Clark , Paul Pushkar

AAPG Bulletin

... style but along the same o ientation of anisotropy. If this hypothesis is correct, then orientation of fold axes in these strata would indicate...

Resedimented Facies in Ventura Basin, California, and Model of Longitudinal Transport of Turbidity Currents

Kenneth J. Hsu , Kerry Kelts , James W. Valentine

AAPG Bulletin

... anisotropy (Nanz, 1960) and the preferred grain orientation of all samples parallels the sand trend, as predicted by the hypothesis of longitudinal...

AAPG International Conference and Exhibition, September 7-10, 1997, Vienna, Austria, - Abstracts, #90942 (1997).

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Displacement Geometry in the Volume Containing a Single Normal Fault

Jim A. M. Barnett , John Mortimer , John H. Rippon , John J. Walsh , Juan Watterson

AAPG Bulletin

..., greater than the horizontal gradient. This difference may be due to the material anisotropy of the flat-lying sedimentary successions. Displacement...

Structural Profiles of Ouachita Mountains, Western Arkansas

Ann E. Blythe , Arnon Sugar , Stephen P. Phipps

AAPG Bulletin

... complex, and that the southward vergence seen in these rocks today may be the result of a strong seaward-dipping anisotropy typically developed in some...

Application of Borehole Images to Three-Dimensional Geometric Modeling of Eolian Sandstone Reservoirs, Permian Rotliegende, North Sea

Stefan M. Luthi, Jayanth R. Banavar

AAPG Bulletin

... (1987) and M. A. Chandler, G. Kocurek, D. J. Coggin, and L. W. Lake (1988, personal communication). Permeability anisotropy variations...

Computer-Generated Corelike Descriptions from Open-Hole Logs (1)

HERVE ANXIONNAZ, PIERRE DELFINER, and JEAN PIERRE DELHOMME

AAPG Bulletin

... are distinguished from shaly sandstone intervals with dispersed clay. The influence of such laminations on the vertical permeability anisotropy can...

Causes and Spatial Distribution of Anomalous Magnetization in Hydrocarbon Seepage Environments (1)

HANS G. MACHEL and ELIZABETH A. BURTON

AAPG Bulletin

... and orientations of geochemical plumes depend on fluid potential gradients, which are determined by topographic relief, buoyancy, anisotropy, bedding, structure...

Evolution of Porosity and Permeability in the Lower Cretaceous Travis Peak Formation, East Texas (1)

SHIRLEY P. DUTTON and TIMOTHY N. DIGGS

AAPG Bulletin

... that even small-scale anisotropy may have an effect on permeability. At least part of the variation in average permeability among samples from different...

A Two-Dimensional Model of Overpressure Development and Gas Accumulation in Venture Field, Eastern Canada (1)

P. L. FORBES , P. UNGERER , and B. S. MUDFORD

AAPG Bulletin

... to permeability (for any lithology), we mean horizontal permeability (K[h]). Vertical permeability (K[v]) is related to K[h] by an user-imposed anisotropy ratio, K...

Geometry and Development of Relay Ramps in Normal Fault Systems

D. C. P. Peacock , D. J. Sanderson

AAPG Bulletin

.... Sanderson, 1992, Effects of layering and anisotropy on fault geometry: Journal of the Geological Society of London, v. 149, p. 793-802. Pollard, D. D...

Thermal Maturity of Lower Paleozoic Sedimentary Successions in Arctic Canada

Thomas Gentzis , Tim de Freitas , Fariborz Goodarzi , Michael Melchin , Alfred Lenz

AAPG Bulletin

... anisotropy at lower maturity levels than does vitrinite (Jacob, 1975; Robert, 1980). Graptolite and solid bitumen reflectances may be more similar than...

The Influence of Fault Permeability on Single-Phase Fluid Flow Near Fault-Sand Intersections: Results from Steady-State High-Resolution Models of Pressure-Driven Fluid Flow

Stephan K. Matthai , Stephen G. Roberts

AAPG Bulletin

... resolve each sand layer and calculate explicitly the gross anisotropy due to this layering. COMPUTATIONAL METHOD The geologic cross section...

Mineralization, fluid flow, and sealing properties associated with an active thrust fault: San Joaquin basin, California

Renee J. Perez, James R. Boles

AAPG Bulletin

..., v. 31, p. 14891503.Lopez, D. L., and L. Smith, 1996, Fluid flow in fault zones: Influence of hydraulic anisotropy and heterogeneity on the fluid...

Sandbox models of downward-steepening normal faults

Thomas L. Patton

AAPG Bulletin

..., and fractures may impart a strong flow anisotropy. For example, Laubach et al. (1995) recorded increased water flow along fracture swarms associated...

A scale-independent approach to fracture intensity and average spacing measurement

Orlando J. Ortega, Randall A. Marrett, Stephen E. Laubach

AAPG Bulletin

... and applications: Journal of Structural Geology, v. 18, no. 23, p. 169178.Marrett, R., 1997, Permeability, porosity, and shear-wave anisotropy from scaling...

Natural fractures in the Barnett Shale and their importance for hydraulic fracture treatments

Julia F. W. Gale, Robert M. Reed, Jon Holder

AAPG Bulletin

... anisotropy associated with fractures. Simon (2005) tried this approach in north Texas using new seismic attributes, including azimuthal interval velocity...

Late opening-mode fractures in karst-brecciated dolostones of the Lower Ordovician Ellenburger Group, west Texas: Recognition, characterization, and implications for fluid flow

Julia F. W. Gale, Leonel A. Gomez

AAPG Bulletin

... is less clear, but the orthogonal sets could reflect low stress anisotropy at the time of fracturing. This might be more likely during the burial...

Fracture permeability created by perturbed stress fields around active faults in a fractured basement reservoir

Tetsuya Tamagawa, David D. Pollard

AAPG Bulletin

... the complete stress tensor: Application to permeability anisotropy and wellbore stability: The Log Analyst, NovemberDecember, p. 2133.Byerlee, J. D., 1978...

Structural evaluation of column-height controls at a toe-thrust discovery, deep-water Niger Delta

Olga V. Kostenko, Steve J. Naruk, Willem Hack, Manuel Poupon, Hans-Jurg Meyer, Miguel Mora-Glukstad, Charles Anowai, Margaret Mordi

AAPG Bulletin

..., 2001, Slip slidin' awaySome practical implications of seismic velocity anisotropy on depth imaging: The Leading Edge, v. 19, p. 7073.MacLean, B. C...