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Topic: Permeability geology

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	Permeability (geology) - Biocrawler (Site not responding. Last check: 2007-10-15)
		In geology, permeability is a measure of the ability of a material (typically, a rock or unconsolidated alluvial material) to transmit fluids through it.
		Permeability is part of the proportionality constant in Darcy's law which relates discharge (flow rate) and fluid physical properties (e.g.
		For a rock to be considered as an exploitable hydrocarbon reservoir, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon - gas reservoirs with lower permeabilities are still exploitable because of the lower viscosity of gas with respect to oil).
	www.biocrawler.com /encyclopedia/Permeability_%28geology%29 (249 words)

	Mini permeability - PanTerra Geoconsultants
		Permeability is commonly measured on plugs that have been taken from the core at intervals of 25 cm or more.
		The use of the mini permeameter is therefore particularly suited for cases where the permeability fluctuates on a scale smaller than the 25 cm interval.
		The technique used to measure mini permeability is non-damaging and rapid.
	www.panterra.nl /index.php/cms_categorie/10345/code/panter/content/categorie/id/15217/fm_parentid/10345 (182 words)

	Permeability (geology) Summary
		Porosity and permeability are two of the primary factors that control the movement and storage of fluids in rocks and sediments.
		In geology, permeability is a measure of the ability of a material (typically, a rock or unconsolidated alluvial material) to transmit fluids through it.
		Permeability is part of the proportionality constant in Darcy's law which relates discharge (flow rate) and fluid physical properties (e.g.
	www.bookrags.com /Permeability_(geology) (859 words)

	Geology Encyclopedia (Site not responding. Last check: 2007-10-15)
		Geology (from Greek γη- (ge-, "the earth") and λογος (logos, "word", "reason")) is the science and study of the solid matter of the Earth, its composition, structure, physical properties, history and the processes that shape it.
		The word "geology" was first used by Jean-André Deluc in the year 1778 and introduced as a fixed term by Horace-Bénédict de Saussure in the year 1779.
		In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.
	www.hallencyclopedia.com /topic/Geology.html (1720 words)

	Permeability
		In SI units, magnetic flux density is measured in tesla, magnetic field strength in ampere per metre and permeability in henrys per metre.
		In geology, permeability is a measure of the ability of a material (typically, a rock) to transmit fluids.
		For a rock to be considered as an exploitable hydrocarbon reservoir, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon - gas reservoirs with lower permeabilities are still exploitable because of the lower viscosity of gas with respect to oil).
	www.ebroadcast.com.au /lookup/encyclopedia/ma/Magnetic_permeability.html (240 words)

	Permeability (fluid) - Wikipedia, the free encyclopedia
		In the earth sciences, permeability (commonly symbolized as κ, or k) is a measure of the ability of a material (typically, a rock or unconsolidated material) to transmit fluids.
		Permeability is part of the proportionality constant in Darcy's law which relates discharge (flow rate) and fluid physical properties (e.g.
		For a rock to be considered as an exploitable hydrocarbon reservoir, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon - gas reservoirs with lower permeabilities are still exploitable because of the lower viscosity of gas with respect to oil).
	en.wikipedia.org /wiki/Permeability_(geology) (303 words)

	Purchase Books / Products : home
		Porosity, permeability, and capillary pressure data (used to estimate saturation) are obtained from core analysis.
		Permeability values, however, cannot be obtained directly from wireline logs in carbonate reservoirs because of the complexity and large variability of carbonate fabrics.
		The foundation of the Lucia classification is the concept that pore-size distribution controls permeability and saturation and that pore-size distribution is related to rock fabric.
	www.aapg.org /eseries/source/orders/index.cfm?section=unknown&task=3&CATEGORY=IOL&PRODUCT_TYPE=SALES&SKU=931&DESCRIPTION=Interactive%20Online%20Learning&FindSpec=&CFTOKEN=79948727&continue=1&SEARCH_TYPE=find (461 words)

	Prof. Richard H. Sibson: Geology Department, University of Otago, New Zealand
		The focus of my research is on the structure and mechanics of crustal fault zones in relation to the shallow earthquake source, combining information from geological field studies of active and ancient exhumed fault zones with theoretical rock mechanics, the materials science of rock deformation, and seismologically derived information on earthquake processes.
		In recent years, a growing interest in the coupling of fluid flow to faulting has led to research into stress-controlled structural permeability, relationships between tectonics and crustal fluid redistribution, and the dynamic processes involved in the formation of fault-hosted hydrothermal mineral deposits.
		Sibson, R.H. 1996: Structural permeability of fluid-driven fault-fracture meshes.
	www.otago.ac.nz /geology/rhs.htm (635 words)

	Oilfield Glossary: Term 'permeability'
		Formations that transmit fluids readily, such as sandstones, are described as permeable and tend to have many large, well-connected pores.
		Absolute permeability is the measurement of the permeability conducted when a single fluid, or phase, is present in the rock.
		Calculation of relative permeability allows for comparison of the different abilities of fluids to flow in the presence of each other, since the presence of more than one fluid generally inhibits flow.
	www.glossary.oilfield.slb.com /Display.cfm?Term=permeability (323 words)

	Beaver Creek Site : Geology
		The Tertiary volcanics overlie older, late Paleozoic fractured--and, therefore, porous and permeable--units that serve as both water conduits and as underground water reservoirs.
		The variable porosity and permeability of the volcanic units determine whether precipitation and runoff infiltrate the regional water table, which is estimated to be anywhere from 300m to 600m below the surface (the exact depth varies from one location to the next).
		The structural grain, or dominant trend of structures, in the Beaver Creek area is northwest-southeast.
	beavercreek.nau.edu /Geology_Soils/geology.htm (523 words)

	permeability
		The permeability (or perviousness) of rock is its capacity for transmitting a fluid.
		Degree of permeability depends upon the size and shape of the pores, the size and shape of their interconnections, and the extent of the latter.
		These relationships are either absolute permeability, which is the quotient of a change in magnetic induction divided by the corresponding change in magnetizing force, or specific (relative) permeability, the ratio of the absolute permeability to the permeability of free space.
	www.webref.org /geology/p/permeability.htm (316 words)

	Petroleum geology - Wikipedia, the free encyclopedia
		Petroleum geology refers to the specific set of geological disciplines that are applied to the search for hydrocarbons (oil exploration).
		Petroleum geology is principally concerned with the evaluation of seven key elements in sedimentary basins:
		Traditionally, these were determined through the study of hand specimens, contiguous parts of the reservoir that outcrop at the surface and by the technique of formation evaluation using wireline tools passed down the well itself.
	en.wikipedia.org /wiki/Petroleum_geology (807 words)

	KGS--Sumner County--Ground Water
		The permeability of a rock is its capacity for transmitting water under pressure and is measured by the rate at which the rock will transmit water through a given cross section under a given difference of head per unit of distance.
		The permeability of water-bearing material generally is expressed as a coefficient of permeability, which is commonly defined by the U.S. Geological Survey as the number of gallons of water per day at a temperature of 60 deg.
		The coefficient of transmissibility is equal to the field coefficient of permeability (same as the coefficient defined above, except that it is for the prevailing temperature of the ground water) multiplied by the saturated thickness of the aquifer (water-bearing material) in feet.
	www.kgs.ku.edu /General/Geology/Sumner/05_gw.html (1672 words)

	Permeability and Dewatering
		Permeability is an important soil parameter for any project where flow of water through soil or rock is a matter of concern.
		There are several factors that influence the permeability of a soil (or rock material): the viscosity of its water (which is slightly influenced by temperature), size and shape of the soil particles, degree of saturation, and void ratio.
		Figure 1 is a sketch of the apparatus used to determine the coefficient of permeability in the laboratory.
	physics.uwstout.edu /geo/perm_dewat.htm (519 words)

	CV
		Research in structural geology: specifically fault growth and propagation, fault zone permeability and deformation of high porosity sandstones.
		Assisted with labs in mapping, structural geology and sedimentology, and field courses in structural geology and mapping.
		Evans, Z. Shipton: Analyses of Permeabilities of Faulted Sandstone in a Subseismic Fault.
	www.tcd.ie /Geology/shiptonz/CV.html (2824 words)

	Groundwater Sensitivity Data
		Areas with peat over till were considered to have the permeability of the underlying till in the sensitivity assessment because of the effectiveness of low permeability till in retarding the rate of travel.
		A subsurface permeability score for each well log was calculated by summing all the weighted unit scores for lithologic units to a depth of 50 feet below the land surface.
		The Moderate sensitivity areas are extensive (35 percent of the rated area of the county), mostly in the northeastern half of Stearns County These areas are associated with loamy Des Moines lobe till in the northwestern portion of the county and sandy Superior lobe till in the eastern part of the county.
	www.soilandwater.co.stearns.mn.us /Lakeshed_Project/groundwater_sensitivity_data.html (2465 words)

	Utah Geological Survey
		The porosity and permeability structures still retain their original link to grain size, in spite of subsequent cementation and carbonate dissolution, so the applicability of fluid-flow modeling to deep exploration plays is not strongly impacted.
		A comparison of average permeability values for a given grain size/sedimentary structure combination suggests that for a specific grain size, permeability decreases as the sorting of the sedimentary structure decreases.
		Algorithms are in place to distribute permeability and porosity within clinoform geometries derived from either: (1) the field-based photomosaics, or (2) the stochastic code.
	geology.utah.gov /emp/ferron/ferr12qu.htm (3760 words)

	Florida Geological Survey \| Geological Bulletin No. 31 \| Geology and Hydrology (Site not responding. Last check: 2007-10-15)
		Following is a discussion of the geology and hydrology of Florida, to the extent that these relate to the occurrence of these many springs.
		Permeable parts of the sedimentary veneer are of local extent and in places supply small springs.
		Where the permeability is low, owing to a high clay content, they serve, along with underlying poorly permeable beds of Miocene and Pliocene age, as confining beds atop the artesian Floridan Aquifer.
	www.flmnh.ufl.edu /springs_of_florida/geohydro.html (3622 words)

	Regional Permeability Estimates from Fracture Apertures (Site not responding. Last check: 2007-10-15)
		Permeability estimates were based on data for the range of apertures that were effectively sampled, and only relied up on fractal modeling for the ineffectively sampled aperture range.
		The estimated permeabilities are similar to permeabilities calculated from specific capacity tests conducted on water wells in the Edwards aquifer.
		The calculated permeability for this outcrop is consistent with values obtained in other studies where o pen conduits such as caves and enhanced dissolution features are present.
	www.geo.utexas.edu /physical_hydrogeology/gw_abstracts/zahm_marrett2.htm (446 words)

	Geology - MSN Encarta
		Economic geology is the use of geologic knowledge to find and recover materials that can be used profitably by humans, including fuels, ores, and building materials.
		Stratigraphy and sedimentary geology are fields that investigate layered rocks and the environments in which they are found.
		Sedimentology, or sedimentary geology, is the study of sediments and sedimentary rocks and the determination of their origin.
	encarta.msn.com /encyclopedia_761555455_5/Geology.html (942 words)

	Groundwater
		Permeability is a measure of the degree to which the pore spaces are interconnected, and the size of the interconnections.
		A good example of a rock with high porosity and low permeability is a vesicular volcanic rock, where the bubbles that once contained gas give the rock a high porosity, but since these holes are not connected to one another the rock has low permeability.
		Good aquifers are those with high permeability such as poorly cemented sands, gravels, and sandstones or highly fractured rock.
	www.tulane.edu /%7Esanelson/geol111/groundwater.htm (1823 words)

	Coalbed methane drilling - Patent 5411104
		A transition from high permeability to low permeability coal is coincident with a vitrinite reflectance of about 0.78 R. The majority of the low rate coalbed methane wells are located in areas where R.sub.o is less than 0.78 and the coals are ranked in the high volatile B bituminous or medium volatile bituminous grades.
		Test data suggests that near wellbore permeability is less than that of pre-existing natural fractures located at greater distances from the well; (b) hydraulic fracture emplacement may cause increased horizontal stress and cleat aperture decrease with permeability decrease in the reservoir adjacent the induced fracture.
		The present system optimizes permeability in that it preserves the natural fracture, permeability, and connectivity of the reservoir around the borehole as well as extending the connectivity of the well to the reservoir by use of a horizontal or lateral borehole following the lay of the reservoir.
	www.freepatentsonline.com /5411104.html (3559 words)

	Definition of Permeability (geology)
		ja:透水性 In geology, permeability is a measure of the ability of a material (typically, a rock) to transmit fluids through it.
		It is of great importance in determining the flow characteristics of hydrocarbons in oil and gas reservoirs, and of water in aquifers.
		Permeability is used to calculate flow-rates using Darcy's law.
	www.wordiq.com /definition/Permeability_%28geology%29 (215 words)

	Indiana Geology Glossary
		A permeable body of rock, such as fractured bedrock or glacial till, that is saturated with ground water and is capable of providing significant quanties of water to wells and springs.
		Permeability caused by post-depositional modification of a rock or sediment, such as fracturing or the development of solution features.
		The part of the total stream load that is carried for a considerable period of time in suspension, free from contact with the stream bed; it consists mainly of clay, silt, and sand.
	igs.indiana.edu /geology/glossary/listEntireGlossary.cfm (3555 words)

	Rock Properties
		Ground Water Atlas of the U.S. an on-line USGS publication that describes the geology and groundwater resources of different regions of the nation.
		Permeability is greater (flow is faster) through the wider passage on the right.
		Permeability is the capacity of water to flow through rock or sediment.
	www.mhhe.com /earthsci/geology/mcconnell/groundwater/prop.htm (1118 words)

	[No title]
		A laboratory device for measurement of permeability of materials, for example, soil or rocks; consists of a powder bed of known dimension and degree of packing through which the particles are forced; pressure drop and rate of flow are related to particle size, and pressure drop is related to surface area.
		A device for measuring the coefficient of permeability by measuring the flow of fluid through a sample across which there is a pressure drop produced by gravity.
		An instrument for measuring the magnetic flux or flux density produced in a test specimen of ferromagnetic material by a given magnetic intensity, to permit computation of the magnetic permeability of the material.
	www.accessscience.com /Dictionary/P/P15/DictP15.html (1672 words)

	geology 312 notes (Site not responding. Last check: 2007-10-15)
		Permeability of the sediments and vertical potential gradients cause recharge of deeper portions of the aquifer from the surface.
		Permeability describes the flow rate of a unit volume of water through a unit cross-sectional area of material under a hydraulic gradient, and is expressed in gallons per day of water per square foot of the aquifer (gpd/sq.
		Local geology affects the flow routes and filtration rates of water seeping through aquifers, and the directions where groundwater and pollution may flow toward the discharge area.
	students.washington.edu /knoblach/geology_312_notes.htm (5276 words)

	DRAM, FGS, Florida Geology Glossary
		geology - the study of the planet Earth, the materials of which it is made, processes that affect these materials, the changes that the Earth has undergone in the past and the changes it is currently undergoing.
		permeability - a measure of a porous material's ability to allow fluids or gases to flow through its pores.
		structural geology - the branch of geology concerned with the deformation of rock bodies and with interpreting the natural forces that caused the deformations.
	www.dep.state.fl.us /geology/geologictopics/glossary.htm (2272 words)

	CHAPTER 3
		If the geology and contaminant distribution are not adequately understood, decisions regarding the applicability of surfactant/cosolvent flushing should not be made.
		Numerous studies in the published literature have demonstrated that relative permeability is a function of fluid saturation (Bear, 1972; Corey, 1986).
		It is clear that as the relative permeability to one phase increases, the relative permeability to the other phase decreases.
	clu-in.org /products/aatdf/chap3.htm (9439 words)

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