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• Geostatic and lithostatic pressure
  | frompg = 5-6 | topg = 5-6
  3 KB (402 words) - 14:47, 16 February 2022
• Free water level determination using pressure
  | frompg = 5-27 | topg = 5-28
  3 KB (463 words) - 17:54, 17 February 2022
• Buoyancy pressures and hydrocarbon presence
  | frompg = 5-1 | topg = 5-64
  3 KB (387 words) - 18:56, 16 February 2022
• Mudlogging: the mudlog
  ...in.]] to [[length::100 ft]] (1:600) and [[length::5 in.]] to [[length::100 ft]] (1:240). This track also includes the location (depth or interval) of the ===Tracks 4 and 5: hydrocarbon evaluation===
  5 KB (752 words) - 15:39, 24 January 2022
• Spontaneous potential logs in water resistivity calculation
  ...ion is necessary if the zone SP is measured from is less than [[length::20 ft]] thick.) # Read the maximum SP response in a zone at least [[length::20 ft]] thick.
  6 KB (1,027 words) - 16:40, 5 April 2022
• Magnetics: interpreting residual maps
  [[file:using-magnetics-in-petroleum-exploration_fig14-5.png|300px|thumb|{{figure number|1}}Geologic map of an area of crystalline [ ...bility. As shown in [[:file:using-magnetics-in-petroleum-exploration_fig14-5.png|Figure 1]], the basement is of complex lithology and is highly fracture
  8 KB (1,109 words) - 17:41, 24 January 2022
• Seal capacity of different rock types
  ...condary hydrocarbon migration and entrapment]: AAPG Bulletin, vol. 63, no. 5, p. 723–760.</ref> Wells and Amaefule<ref name=ch10r94>Wells, J., D., Ama * Most good sands can trap only [[length::50 ft]] or less of oil column.
  5 KB (760 words) - 20:55, 31 March 2022
• Static gas pressure gradient estimation
  | frompg = 5-21 | topg = 5-25
  7 KB (979 words) - 15:24, 17 February 2022
• Displacement pressure: theory vs. reality
  ...xperimental study of secondary oil migration]: AAPG Bulletin, vol. 76, no. 5, p. 638–650.</ref> These experiments at best have column heights 19–23% ...ld in the Tar Springs Formation reservoir is [[length::29 m]] [[depth::(95 ft]]).
  4 KB (587 words) - 13:36, 1 April 2022
• Water resistivity determination
  * If the bed was too thin for the SP to develop fully (beds thinner than 20 ft), the appropriate correction is applied from the charts. | 1-5
  13 KB (2,077 words) - 17:26, 18 January 2022
• Borehole gravity
  ...ma-gamma [[density log]]. The broader difference anomaly observed over the length of the logged interval is explained by the structural influence of the reef ...g (VSP)]] surveys. The BHGM is stopped at each planned survey level, and a 5- to 10-min reading is taken. The blocky appearance of the log reflects the
  10 KB (1,517 words) - 15:54, 20 January 2022
• Petrophysical analysis of Sorrento field wells
  ...but too tight to produce. Between these are [[length::30 ft]] [[depth::(8.5 m]]) of mesoto macroporous sandstone (flow units 1-4). Subsea elevation of –1,030 ft (–314 m) is marked in the depth track.
  7 KB (956 words) - 17:24, 11 April 2022
• Conventional coring
  ...::1.5 ft]] for short radius horizontal wells to greater than [[length::400 ft]] for vertical holes. ! Inner Barrel || Core Length (ft) || Special Features
  13 KB (1,885 words) - 20:49, 19 January 2022
• Sampling for paleontology
  ...ch joint of drill pipe added to the drill string (i.e., every [[length::30 ft]], or 9 m) and represents an amalgamated sample of the rocks penetrated in ...ch joint of drill pipe added to the drill string (i.e., every [[length::30 ft]], or 9 m). However, the geologist can specify a different interval if nece
  7 KB (1,051 words) - 18:08, 24 January 2022
• Borehole gravity applications: examples
  ...gamma-gamma density log. The broader difference anomaly observed over the length of the interval is explained by the influence of the entire reef complex. ...after hydrofracturing the reservoir. In Case #4 the missed pay is about [[length::1 m]] from the well, and the density difference is very pronounced. Such p
  11 KB (1,596 words) - 18:08, 24 January 2022
• Buoyancy pressure
  | frompg = 5-1 | topg = 5-64
  4 KB (596 words) - 18:37, 17 February 2022
• Seismic data acquisition on land
  file:seismic-data-acquisition-on-land_fig5.png|{{figure number|5}}(a) Off end shooting. (b) Split spread shooting. ...include dynamite in “shot holes” ranging in depth from 10 to [[length::300 ft]] (3 to 100 m) and primacord in trenches covered by a few inches of soil. H
  10 KB (1,389 words) - 16:20, 20 January 2022
• Open hole tools
  | Spontaneous potential (SP) || 6–10 ft || N/A || Well-to-well correlation, estimate ''R''_w , and indica | Gamma ray || [[length::2 ft]] || [[length::12 in]] || Well-to-well correlation and estimate ''V''_sh || Sen
  23 KB (3,350 words) - 17:26, 18 January 2022
• Rate of penetration
  ...s calculated by measuring the length of time required to drill [[length::1 ft]] of depth. This is typically done by reading the chart on the geolograph. ...pen on the geolograph places a small mark on the chart. Every [[length::5 ft]] the pen places a larger mark on the chart ([[:file:rate-of-penetration_fi
  7 KB (1,049 words) - 19:02, 20 January 2022
• Wellbore trajectory
  wellbore-trajectory_fig5.png|{{figure number|5}}Kicking off with a jet bit.]] ...tom in the desired trajectory ([[:file:wellbore-trajectory_fig5.png|Figure 5]]). Weight is applied to the bit while it is rotated into the pocket. This
  14 KB (2,167 words) - 20:46, 19 January 2022
• Rock quality
  ...carbonate and sandstone reservoirs: Amoco Production Company Report F76-G-5, 25 p. (unpublished).</ref> developed the following equation to calculate r ...cting-reservoir-system-quality-and-performance_fig9-20.png|{{figure number|5}}Hypothetical capillary pressure curves.
  10 KB (1,534 words) - 16:53, 4 April 2022
• Wellsite math
  | D || Vertical depth || ft | V_bpf || Volume || bbl/ft
  21 KB (3,142 words) - 15:10, 24 January 2022
• Facies map
  ...he gravity flows); 4 = deep-water deposits of the northern Adriatic Basin; 5 = condensed deposits of the Rosso Ammonitico Veronese (lower member). From file:sedimentary-basin-analysis_fig4-38.png|{{figure number|5}}Net sand distribution of shelf areas contoured parallel to the shelf edge
  15 KB (2,070 words) - 20:34, 7 July 2016
• Drill stem testing
  ...arlougher, R. C., 1977, Advances in well test analysis: SPE Monograph Vol. 5, Society of Petroleum Engineers, New York, p. 90–103.</ref><ref name=pt03 ===Length of test interval===
  26 KB (4,009 words) - 15:09, 24 January 2022
• Stimulation
  ...uses the fracture to extend from the wellbore, and this growth in fracture length is accompanied by an increase in fracture width at the wellbore and proport [[file:stimulation_fig5.png|300px|thumb|{{figure number|5}}Proppant is introduced to fracture.]]
  24 KB (3,633 words) - 13:55, 24 January 2022
• Seismic data: building a stratigraphic model
  ...traces] for interpretation. The receiver spacing is usually [[length::10 ft]]. This gives actual [http://wiki.seg.org/wiki/Dictionary:Traveltime travel ...ery coarse velocity data can be obtained from a checkshot survey with only 5 or 6 traveltimes per well.
  5 KB (805 words) - 19:06, 27 January 2022
• Fluid contacts
  * ''C'' = pressure gradient constant (0.433 psi/ft or 0.1 kg/cm²/m) ...oil contacts are at elevations of [[length::-5020 ft]] and [[length::-5080 ft]], respectively.
  19 KB (2,690 words) - 21:20, 19 January 2022
• East Breaks reservoir rock
  File:Sedimentary-basin-analysis fig4-43.png|{{figure number|5}}North-South seismic section through the East Breaks 160-161 field. ...is_fig4-42.png|Figures 4]], [[:file:sedimentary-basin-analysis_fig4-43.png|5]], and [[:file:sedimentary-basin-analysis_fig4-44.png|2]]). The 160-1 elect
  13 KB (1,771 words) - 17:24, 5 December 2023
• Core description
  ...ks: The University of Texas at Austin, Bureau of Economic Geology Handbook 5, 43 p.</ref> and Boyles et al.<ref name=pt05r28>Boyles, J. M., A. J. Scott, ...gh. Usually a scale of [[length::1 in]] = [[length::5 ft]] or [[length::10 ft]] is appropriate.
  13 KB (1,786 words) - 20:50, 19 January 2022
• Structural exploration: thrust belt example
  exploring-for-structural-traps_fig20-5.png|{{figure number|2}}Tectonic setting for the western U.S. relevant to La [[:file:exploring-for-structural-traps_fig20-5.png|Figure 2]] depicts the tectonic setting for the western U.S. relevant t
  14 KB (1,897 words) - 20:01, 3 February 2022
• Workovers
  ...[:file:workovers_fig1.png|Figure 1]]. The production casing is only 5 to [[length::9 in.]] in diameter, and it has been run into a corkscrew-shaped hole that ...asons just noted are generally completed to yield a profit in a reasonable length of time. Those done for the following reasons may have little profit incent
  12 KB (1,834 words) - 15:25, 24 January 2022
• Relating traps to paleogeography
  ...roduce from the ''Glob alt'' sandstones and the ''Glob alt'' sandstone 200-ft (60-m) isopach. file:sedimentary-basin-analysis_fig4-56.png|{{figure number|5}}North–south seismic section showing the hypothetical model for migration
  11 KB (1,482 words) - 15:47, 21 March 2022
• Mudlogging: drill cuttings analysis
  ...eflect the various lithologies drilled over a 10-ft interval. The interval length can vary depending on the drilling rate and the detail needed for reservoir ...re typically washed through a 5-mm sieve. Particles greater than [[length::5 mm]] usually contain a high percentage of lost circulation material and cav
  10 KB (1,482 words) - 15:25, 24 January 2022
• Full waveform acoustic logging
  ...Z; (2) the source-receiver spacing is longer, on the order of [[length::10 ft]] (3.05 m); and (3) the receiver is commonly an array consisting of four to ...ed and digitized, with the typical digitization interval being 5 μsec. The length of the time window recorded varies from 2 to 10 msec, depending on the sour
  10 KB (1,530 words) - 20:47, 19 January 2022
• Types of wells
  ...of keeping it substantially within the reservoir target until the desired length of horizontal penetration is reached ([[:File:M91Figure161.JPG|Figure 1]]). At very high angles, if the top reservoir is 15 m (49 ft) deeper than predicted, the target will be penetrated much later than plann
  22 KB (3,567 words) - 17:20, 11 March 2019
• East Breaks hydrocarbon migration model
  ...flow regimes of the Louisiana Gulf Coast above a depth of [[depth::20,000 ft]] (6096 m). The uppermost regime consists of low-salinity, meteoric water d ...overpressure and undercompacted sediments below a depth of [[depth::10,000 ft]] (3048 m). The consequent thermal and geopressure gradient would drive flu
  10 KB (1,376 words) - 16:00, 23 March 2022
• Cross-well electromagnetic tomography monitoring of fluid distribution
  | Frequency || 5-1000 Hz || 5-1000 Hz || Harmonics > 1000 Hz | Logging Speed || Typical 2000-5000 ft/hr || Stationary (tomography) || TX speed adjusted to meet required signal-
  18 KB (2,715 words) - 18:29, 8 February 2024
• Well types
  ...of keeping it substantially within the reservoir target until the desired length of horizontal penetration is reached ([[:file:M91Figure161.JPG|Figure 1]]). At very high angles, if the top reservoir is 15 m (49 ft) deeper than predicted, the target will be penetrated much later than plann
  24 KB (3,753 words) - 19:33, 3 March 2016
• Fault seal analysis for reservoir development
  ...nd the fault seal capacity: Journal of the Geological Society, v. 163, no. 5, p. 741-751.</ref>).]] ...e corresponding position on the diagram ([[:file:GumelarFigure5.jpg|Figure 5]]) using this technique, the alignment of the relationship positions at any
  14 KB (2,146 words) - 19:35, 13 September 2022
• Drilling a well
  ...s that sit on the sea floor. In moderately deep water (more than 45 m [150 ft] deep), a floating or semisubmersible rig is used. The semisubmersible rig ...eep water is defined as water depths between 500 and 2000 m (1640 and 6562 ft).<ref name=Weimerandslatt_2004>Weimer, P., and R. M. Slatt, 2004, Petroleum
  15 KB (2,385 words) - 15:05, 1 August 2016
• Petroleum exploration
  UGM_Petroleum_Exploration_Fig_5.png|{{figure number|5}}Land Seismic Acquisition (Source: [https://www.oilinuganda.org/ Oil in Uga [[File:UGM_Petroleum_Exploration_Fig_7.png|thumb|upright=2.5|center|{{figure number|7}}Vertical section illustrating CMP recording The 0
  15 KB (2,331 words) - 19:12, 17 April 2019
• Well completion
  ...with a dual or triple completion in reservoirs deeper than [[depth::10,000 ft]]. well-completions_fig5.png|{{figure number|5}}Wellbore diagram of a conventional triple completion.
  19 KB (2,910 words) - 21:06, 18 January 2022
• Magnetics
  ...h::100 ft]] above the earth's surface, but heights of 500 to [[depth::1500 ft]] are more typical. The line spacing for complete detail should not be much ...rth America: Boulder, CO, Geological Society of America, 4 sheets, scale 1:5,000,000.</ref> showed results on a continental scale. Paterson and Reeves<r
  10 KB (1,481 words) - 15:39, 24 January 2022
• Dipmeter
  ...te that the curves are responding to apparent bedding features less than [[length::1 in.]] thick. ...harply distinguishes between [[sandstone]] and shale layers thinner than [[length::1 in.]] By establishing a cutoff line as shown, everything to the right ca
  14 KB (2,128 words) - 17:25, 18 January 2022
• Eolian reservoirs
  ...large-scale sand blankets. These may be very thick (more than 300 m [1000 ft]), and cover hundreds of square kilometers.<ref name=Richardsonetal_1988a>R .... The width-to-thickness ratio is estimated as between 50:1 and 100:1. The length-to-thickness ratio is estimated as 200 to 1.
  19 KB (2,690 words) - 18:42, 1 August 2016
• Meandering fluvial reservoirs
  ...SEG (Society of Exploration Geophysicists) Geophysical Developments Series 5, p. 45–56.</ref>). Reprinted with permission from the AAPG.]] ...g river deposits in his database is only 38 m (124 ft), with 4–20 m (13–65 ft) as a common thickness range. Gibling makes the comment that despite their
  32 KB (4,727 words) - 21:03, 15 January 2024
• Preprocessing of logging data
  ;5. Edit logs to eliminate invalid data: Erroneous data can be recorded in cas ...eference before data processing can continue. A depth shift of [[length::3 ft]] can destroy an otherwise good correlation among logging measurements or b
  13 KB (2,094 words) - 17:42, 18 January 2022
• Deltaic reservoirs
  ...d that distributary channels show a common width range of 10–300 m (33–984 ft) (see Table 2). Distributary channels tend to be straight where they incise ...) || 50 m-1300+ km (164 ft-808+ mi); many > 1 km (0.62 mi); common range 0.5-10 km (0.3-6 mi) || 15-15,000+; some > 1000; common range 50-1000
  34 KB (4,776 words) - 18:18, 5 January 2024
• Rock-water reaction: formation damage
  ...er-balanced (1000 psi) Increase well rate slowly Maximize perforations per ft Select rate less than critical velocity Use clay stabilizer || Preflush if ...e have cation exchange capacity (CEC) values of approximately 100, 20, and 5, respectively, Thus, total brine cation concentration must be higher to pre
  17 KB (2,380 words) - 18:23, 21 January 2022
• Relationship between porosity and permeability on fractured basement reservoir
  ...structure and probability factor f. B. Matrix and fracture on porous f = 0,5 (Erlich, 1971) ...s, shows comparative size in matrix with probability fracture factor f = 0,5. Residual saturation of oil has been evaluated by Erlich model with dimensi
  29 KB (4,601 words) - 16:09, 12 April 2016

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