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  • Estimating formation water density
    #REDIRECT [[Formation water density]]
    37 bytes (4 words) - 21:06, 14 July 2014
  • Determining porosity from density–neutron logs
    #REDIRECT [[Density-neutron log porosity]]
    42 bytes (4 words) - 19:46, 14 January 2015
  • Determining porosity from density-neutron logs
    #REDIRECT [[Density-neutron log porosity]]
    42 bytes (4 words) - 16:56, 19 December 2014
  • Normal hydrostatic pressure gradients
    ...adient is the rate of change in formation fluid pressure with depth. Fluid density is the controlling factor in the normal hydrostatic gradient. In the U.S. R ==Factors controlling fluid density==
    3 KB (428 words) - 10:24, 17 March 2022
  • Static oil pressure gradient estimation
    ...pedia:Pressure|pressure]]. [[Oil and condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and [[P # Estimate oil density using Figure 1.
    3 KB (355 words) - 15:18, 17 February 2022
  • Static hydrocarbon pressure gradients
    ...sured. When density is not measured, charts are available to help estimate density.
    2 KB (195 words) - 15:17, 17 February 2022
  • Gravity anomaly models
    * Density ...he size (shape) and depth of the geologic body than it is to constrain the density.
    4 KB (551 words) - 14:51, 31 January 2022
  • Formation water density
    Formation water density is a function of three variables: ==Estimating density from TDS==
    5 KB (714 words) - 15:19, 13 September 2022
  • Borehole gravity: uses, advantages, and disadvantages
    * Measuring [[Basic_open_hole_tools#Density|bulk density]] when radioactive tools are too risky * Directly measures [[Basic_open_hole_tools#Density|bulk density]]
    3 KB (351 words) - 15:11, 31 January 2022
  • Geostatic and lithostatic pressure
    * [[Wikipedia:Density|Densities]] of formation waters as related to [[Wikipedia:Salinity|saliniti * ρ<sub>m</sub> = weighted average of grain (mineral) density (sandstone and shale = 2.65 g/cm<sup>3</sup>, limestone = 2.71 g/cm<sup>3</
    3 KB (402 words) - 14:47, 16 February 2022
  • Gravity in petroleum exploration
    ...]] meter are effective in locating [[fault]]s and geologic structures with density contrasts to their surroundings. The borehole gravity meter has broad appli
    1 KB (187 words) - 17:53, 25 January 2022
  • Top seal ductility estimation
    ...a top seal]] can be estimated (1) by using laboratory data and log-derived density values that reflect the compaction state or (2) by comparing the strains in ==Shale ductility and density==
    7 KB (1,000 words) - 15:22, 30 March 2022
  • Seismic data: building a stratigraphic model
    ...ere there is a contrast in impedance (which is the product of velocity and density). Depth-dependent velocity and density models are needed to identify events or to create a synthetic seismogram. V
    5 KB (805 words) - 19:06, 27 January 2022
  • Static gas pressure gradient estimation
    ...density. Static gas pressure gradients can be estimated if subsurface gas density is known or has been estimated. Subsurface gas density is dependent on the ratio of its mass to its volume. Mass is related to the
    7 KB (979 words) - 15:24, 17 February 2022
  • Pressure prediction: analysis of cuttings
    ==Density of shale cuttings== ==Measuring shale cuttings density==
    5 KB (818 words) - 17:56, 17 February 2022
  • Hydrocarbon pressure gradient: plotting
    #* Measured hydrocarbon [[Wikipedia:Density|density]] #* Estimates of hydrocarbon density
    3 KB (381 words) - 17:54, 17 February 2022
  • Density-neutron log porosity
    The combination of the density and neutron logs provides a good source of [[porosity]] data, especially in ==Density log==
    12 KB (1,763 words) - 16:18, 5 April 2022
  • Interpreting gravity measurements
    ...odel sections. Divide the section into intervals of approximately the same density. ...ment rocks are not closer to the surface. These structures may be of lower density than the surrounding rocks.
    5 KB (725 words) - 18:00, 24 January 2022
  • Hydrostatic pressure-depth plot construction
    * Pressures calculated from water density ...culate the gradient from the water density using [[Formation water density|density measured from the formation water]] or calculated from the [[Spontaneous po
    7 KB (895 words) - 18:57, 16 February 2022
  • Methods for obtaining formation fluid pressures
    * Calculating hydrostatic pressures from measured water density or salinity * Estimating hydrostatic pressures from fluid density using R<sub>w</sub> (formation water resistivity)
    2 KB (295 words) - 17:54, 17 February 2022
  • Buoyancy pressure
    ...occur together, they create a buoyancy pressure that is a function of the density difference between the two fluids and the length of the less-dense fluid co * ρ<sub>w</sub> = density of water, g/cm<sup>3</sup>
    4 KB (596 words) - 18:37, 17 February 2022
  • Borehole gravity applications: examples
    ...density measurements and the gamma-gamma log density measurements. (right) Density values measured by the BHGM (left line) and the gamma-gamma tools (right li ...aused by a remote higher [[porosity]] zone not detected by the gamma-gamma density log. The broader difference anomaly observed over the length of the interva
    11 KB (1,596 words) - 18:08, 24 January 2022
  • Pressure prediction: analysis of well-log and seismic data
    [[Basic open hole tools#Resistivity|Resistivity]], sonic, and density logs (as well as some others) can give clues to the presence of over- or un ...depth, mark the value of resistivity, conductivity, sonic travel time, or density.
    5 KB (733 words) - 17:57, 17 February 2022
  • Migration rate calculation
    ...a, including [[permeability]] of carrier beds, [[viscosity]] of oil, fluid density, and [http://www.glossary.oilfield.slb.com/en/Terms/p/pore_pressure.aspx po * ρ<sub>hc</sub> = hydrocarbon density (kg/m<sup>3</sup>)
    4 KB (618 words) - 19:40, 14 February 2022
  • Borehole gravity
    ...n 6330 and 6370 ft is caused by porosity not detected by the gamma-gamma [[density log]]. The broader difference anomaly observed over the length of the logge ...e [[gravity]] meter (BHGM) can be described simply as a deep-investigating density logging tool. Applications range beyond this simple description to include
    10 KB (1,517 words) - 15:54, 20 January 2022
  • Using conventional well logs to estimate richness
    ...ydrogen and carbon contents. All of these attributes can be measured using density sonic, neutron, [[Basic open hole tools#Gamma ray|gamma ray]], and [[Basic | Density || Low (approx. 1 g/cm<sup>3</sup> ) || Similar to pore fluids
    5 KB (768 words) - 15:48, 9 February 2022
  • Borehole gravity tool
    ...tion_fig15-10.png|300px|thumb|{{figure number|1}}Fundamentals of measuring density using a borehole gravity sensor. From Schowalter;<ref name=Schowalter1979>S ...y of the intervening layer. The result is a direct computation of the bulk density of that layer.
    5 KB (720 words) - 18:07, 24 January 2022
  • API gravity
    ...of the American Petroleum Institute (API) that is inversely related to the density of liquid petroleum: API [[gravity]] = (141.5&deg;/[secific gravity at 16&d
    951 bytes (140 words) - 14:03, 25 February 2016
  • Designing a surficial geochemical survey
    ...s.com/data/specpubs/memoir66/18/0243.htm Importance of sampling design and density in target recognition], in D. Schumacher and M. A. Abrams, eds., Hydrocarbo ==Sample density==
    6 KB (826 words) - 17:33, 25 January 2022
  • Hydrocarbon column: calculation of maximum height
    * ''ρ<sub>w</sub>'' = density of water, g/cm<sup>3</sup> * ''ρ<sub>h</sub>'' = density of hydrocarbon, g/cm<sup>3</sup>
    3 KB (488 words) - 16:13, 31 March 2022
  • Hydrodynamic traps: mapping
    ...ynamic traps. Combining formation fluid pressures with other data, such as density and subsea elevation, produces maps that help outline areas where hydrodyna #*Note: Use gas density where gas is expected and oil density where oil is expected.
    4 KB (601 words) - 22:27, 17 February 2022
  • Hydrofractured seal leakage
    ...static pressure gradient is estimated from [[Basic_open_hole_tools#Density|density logs]] or [[porosity]] trend. * Petroleum density is estimated from the gas-oil ratio (GOR), [[API gravity]], temperature, an
    5 KB (679 words) - 17:11, 1 February 2022
  • Fluid-composition trap regime
    ...bility]], [[Wikipedia:Miscibility|immiscibility]], and [[Wikipedia:Density|density]] contrasts between [[hydrocarbon]]s and water are major factors that allow
    3 KB (402 words) - 16:31, 13 April 2022
  • Synthetic seismogram
    Velocity data from the sonic log (and the [[density log]], if available) are used to create a synthetic seismic trace. This tra ...ves are digitized at a sample interval of 0.5 to [[length::1 ft]]. (If the density curve is not available, the sonic alone may be used.)
    8 KB (1,199 words) - 13:57, 24 January 2022
  • Formation evaluation of naturally fractured reservoirs
    ===Correction curve on the compensated density log=== The Δρ (delta rho) curve corrects the [[Basic open hole tools#Density|density log]] for the effect of rough borehole and mud cake. As such, the correctio
    9 KB (1,380 words) - 17:25, 18 January 2022
  • Seismic data display
    In exploration seismology, reflections are recorded from velocity or density contrasts in the rock sequence. By SEG convention, an increase in velocity, ...trace, (b) variable area, (c) variable area wiggle trace, and (d) variable density. Copyright: Conoco Inc.]]
    9 KB (1,404 words) - 21:17, 19 January 2022
  • Hydrostatic pressure gradient
    * [[Estimating formation water density]]
    2 KB (207 words) - 18:56, 16 February 2022
  • Gravity data processing
    | Elevation & surface density | Detailed topography & surface density
    4 KB (519 words) - 14:16, 31 January 2022
  • Factors that cause migration
    ...ity is less than that of water. This buoyancy force is proportional to the density difference and the height of the [[hydrocarbon column]]. It acts vertically ...ssure (P) decreases the buoyancy force as the hydrocarbons are buried. The density of hydrocarbons increases more rapidly than that of water as pressure incre
    6 KB (918 words) - 15:16, 14 February 2022
  • Seismic data interpretation - recurring themes
    ...effect, an edge detection technique. The bigger the [[velocity]] and/or [[density]] contrast between the rocks, the stronger the edge. ...uding a [[Fluid contacts|fluid contact]], [[porosity]] variation, or shale density change.
    5 KB (739 words) - 18:51, 27 January 2022
  • Hydrodynamic influence on trapping
    * ρ<sub>w</sub> = water density * ρ<sub>h</sub> = [[hydrocarbon]] density
    4 KB (582 words) - 22:08, 17 February 2022
  • Buoyancy forces in reservoir fluids
    ...the oil-water interface and the force of gravity acting together with the density contrast between the reservoir fluids, tending to pull the water down. ...rocarbon-water interface and the force of gravity acting together with the density contrast between the reservoir fluids, acting to pull the water down.<ref n
    8 KB (1,182 words) - 20:27, 3 March 2016
  • Seismic data preparation for mapping
    # Compute a synthetic seismogram for each online well with a sonic or [[density log]]. .... Another option is to convert sonic log (or velocity, density, velocity * density) to time and directly overlay onto the seismic section being interpreted. F
    7 KB (1,064 words) - 19:11, 27 January 2022
  • Standard interpretation
    ...ty formations, the compensated neutron in very low porosity formations, or density versus neutron crossplots in known lithologies. ...ic|sonic]] logs. When using a single porosity measuring device such as the density, neutron, or sonic, assumptions are normally required to estimate porosity.
    25 KB (3,776 words) - 19:53, 18 January 2022
  • Determining water saturation
    * [[Determining porosity from density-neutron logs]]
    2 KB (244 words) - 13:38, 5 April 2022
  • Preprocessing of logging data
    ...log. The gamma ray from the density curve and all curves recorded with the density are then shifted to match the induction log depths. The base curve should a ...epth shifts required. Core bulk density usually correlates well with the [[density log]] because lithologic variations are eliminated, resulting in two simila
    13 KB (2,094 words) - 17:42, 18 January 2022
  • The gravity method
    ...' that are caused by rocks having anomalous density in comparison with the density of the surrounding rocks. ...in aircraft, and in boreholes.<ref name=pt07r31>LaFehr, T. R., 1983, Rock density from [[borehole gravity]] surveys: Geophysics, v. 48, p. 341, DOI: [http://
    6 KB (854 words) - 16:19, 20 January 2022
  • Core-to-log transformations and porosity-permeability relationships
    ...}Plot showing unshifted core porosity in spiked format, together with bulk density log. ...|{{figure number|2}}Plot showing shitted core porosity, together with bulk density log.
    14 KB (1,893 words) - 20:15, 2 February 2016
  • Drilling fluid
    ...on and the subsurface environment. The most critical of the properties are density, [[viscosity]], fluid loss control, and chemical composition. ===Density===
    13 KB (1,866 words) - 21:17, 19 January 2022
  • Tool table
    | [[Basic open hole tools#Density|Density]] || 6 || 16 || √ || √ || √ || √ || √ || √ || 0–2.0 || × ||
    5 KB (544 words) - 16:27, 18 January 2022

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