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• Reservoir quality
  ...higenic minerals can preserve the original porosity by protecting the rock from later degradation by compaction or cementation.<ref name=pt06r158>Wilson, M Numerous methods exist for assessing reservoir quality, ranging in scale from the macroscopic to the microscopic (see [[Evaluating diagenetically complex
  18 KB (2,514 words) - 17:47, 21 January 2022
• Core-to-log transformations and porosity-permeability relationships
  ...e of formation measured by the bulk density tool relative to that obtained from a core plug. ...ysis applications|quantitative log analysis]] are reasonable and that data from both sources are mutually supportive.
  14 KB (1,893 words) - 20:15, 2 February 2016
• Cross-borehole tomography
  ...eservoir [[cross section]] between two boreholes. The information obtained from cross-borehole tomography, when properly interpreted in the context of all ...lly in the frequency range of 20 Hz to as high as several kilohertz. Sonic logs represent the measurement of velocities at the wellbore and are usually plo
  14 KB (2,060 words) - 20:51, 19 January 2022
• Tool table
  ...ices are designed to operate excentered, some centered, and some stood off from the borehole wall. Tool positioning is important in ensuring valid environm * [[Quick-look lithology from logs]]
  5 KB (544 words) - 16:27, 18 January 2022
• Pay determination
  ...under a set of known or predicted economic conditions. It is of importance from the field discovery, through initial appraisal and development phases, to f ''Pay'' is defined as that part of a reservoir unit from which hydrocarbons can be produced ''at economic rates given a specific pro
  13 KB (1,799 words) - 19:01, 20 January 2022
• Log analysis: lithology
  ...This article reviews some common techniques that can be used to solve for lithology and porosity. It also addresses some commonly encountered lithologies and t The occurrence of difficult lithologies can be identified from the following sources:
  25 KB (3,189 words) - 17:24, 18 January 2022
• Borehole imaging devices
  ...s of the rocks exposed on the borehole wall. They are thus two-dimensional logs, with depth and [[azimuth]] as independent variables. Among these, the optical method is omitted from the following discussion because it is confined to boreholes with clear bor
  10 KB (1,313 words) - 16:24, 18 January 2022
• Fractured reservoir evaluation
  | Reservoir performance is controlled by sedimentary facies, lithology and/or geometry || Determine sedimentary characteristics and origin of faci ...fractures || Evaluate the relationship between [[fracture]] occurrence and lithology<ref name=pt06r100>Pitman, J. K., and E. S. Sprunt, 1986, [http://archives.d
  26 KB (3,674 words) - 21:21, 19 January 2022
• Fault plane profile construction
  Because only a fraction of the stratigraphy is mapped routinely, well logs are used to project the remainder of the detailed stratigraphy onto the FPP ...points|JLLPs (juxtaposed lithology leak points)]]. Hydrocarbons cross-leak from the footwall sands into the hanging wall sands.
  6 KB (834 words) - 14:51, 29 March 2022
• Tight gas reservoirs: evaluation
  ...tight sandstone formations are likely to have recoverable reserves ranging from 100 to 400 tcf, and Devonian shales have recoverable reserves of up to 100 ...escription; facies and environments of deposition are shown on the right. (From Moslow and Tillman.<ref name=pt06r93>Moslow, T. F., Tillman, R. W., 1986, [
  11 KB (1,444 words) - 21:26, 4 January 2024
• Data: sources
  ...re, particularly if obtained from wells offshore. For instance, core taken from a drilling operation on an offshore drilling rig may have cost more than a A production geologist will use data from a variety of sources. These include:
  43 KB (6,686 words) - 13:44, 18 March 2019
• Lithofacies and environmental analysis of clastic depositional systems
  | Shift to wireline logs | [[Mineralogy]], lithology
  38 KB (5,198 words) - 22:11, 15 January 2024
• Amplitude versus offset (AVO) analysis
  ...,<ref name=pt07r19>Hilterman, F. J., 1990, Is AVO the seismic signature of lithology? A case history of Ship Shoal-South Addition: Geophysics—The Leading Edge ...rom an interface characterized by a contrast in Poisson's ratio, but also from interfaces that are entirely acoustic—that is, the measured response is m
  12 KB (1,723 words) - 18:41, 20 January 2022
• Flow units for reservoir characterization
  ...ly different from the properties of other reservoir rock volumes (modified from Ebanks<ref name=pt06r31 />). Flow units have the following characteristics ...several flow units is warranted. A flow unit zonation differs in principle from a lithofacies zonation in that it integrates geological, petrophysical, and
  16 KB (2,282 words) - 20:46, 19 January 2022
• Pressure detection
  ...igher than normal that require heavy drilling mud to keep formation fluids from entering the borehole. Pressures lower than normal are called ''subnormal'' Pressure data from some U.S. Gulf coast wells suggest that the aquathermal effect is important
  16 KB (2,450 words) - 21:42, 20 January 2022
• Drilling a well
  ...the danger involved in the combustion and explosive blast that can result from a hydrocarbon blowout. ...ship using global positioning system technology or in response to signals from transducers on the sea bed. Signals are sent to propellers and [[lateral]]
  15 KB (2,385 words) - 15:05, 1 August 2016
• Dipmeter
  ...at the electric wireline technique known as the ''dipmeter'' was designed. From these primitive beginnings, however, the dipmeter has evolved to become a d ..._fig2.png|{{figure number|2}}Expanded scale recording of raw dipmeter data from a six-arm tool.
  14 KB (2,128 words) - 17:25, 18 January 2022
• Fluid contacts
  ...g from hydrodynamic conditions. (c) Contact elevation is constant for each lithology type, but pool contact is irregular due to reservoir heterogeneity. (d) Irr ...ttp://wiki.seg.org/wiki/Dictionary:Wireline_log wireline logs], estimation from conventional and sidewall cores, and pressure methods. Once initial fluid c
  19 KB (2,690 words) - 21:20, 19 January 2022
• Reservoir modeling for simulation purposes
  ...ow fundamentals]]). Reservoir heterogeneities influencing fluid flow range from large scale faults and discontinuities down to thin shale intercalations, s ...ing the facies of the reservoir rock through data gathering from cores and logs
  17 KB (2,234 words) - 21:21, 19 January 2022
• Carbonate diagenesis
  ...ased on observations of depositional and diagenetic fabrics and pore space from [[Overview of routine core analysis|core]] and [[Mudlogging: drill cuttings ...hallow, warm ocean waters by extraction of [[Carbonate|calcium carbonate]] from seawater by organisms to form their shells or skeletal material. The sedime
  23 KB (3,026 words) - 20:48, 19 January 2022

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