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• Quick-look lithology from logs
  | chapter = Quick-look lithology from logs ...quick-look interpretation can be made by visual inspection of appropriate logs.
  25 KB (3,637 words) - 19:39, 18 January 2022

Page text matches

• Lithofacies analysis
  [[Lithofacies]] are interpreted from well data and [[Basics of seismic facies analysis|seismic facies]] descript # Learn as much as possible about the regional geology from well and [http://www.merriam-webster.com/dictionary/outcrop outcrop] contro
  2 KB (317 words) - 18:52, 4 February 2022
• Density-neutron log porosity
  ...nation than using either tool or sonic separately because inferences about lithology and fluid content can be made. ...ctron (P_e) [[cross section]] curve, an independent indicator of lithology.
  12 KB (1,763 words) - 16:18, 5 April 2022
• Formation evaluation of naturally fractured reservoirs
  Well logs can be considered as an indirect source of information. Sometimes they are ...er features such as a rough borehole, shales, and changes in [[porosity]], lithology, and tool centralization might produce amplitude drops that have nothing to
  9 KB (1,380 words) - 17:25, 18 January 2022
• Stratigraphic trap
  ...including [[Seismic interpretation|seismic]], [[Quick-look lithology from logs|well log]], [[Petroleum reservoir fluid properties|fluid character]], [[For
  1 KB (176 words) - 12:51, 3 July 2014
• Mudlogging: the mudlog
  ...es. This is necessary to allow valid and convenient comparison of log data from well to well and to prevent confusion or misunderstanding over the meaning ...dardize mudlog formats, present and previous mudlogs may differ in outline from this example.
  5 KB (752 words) - 15:39, 24 January 2022
• Rate of penetration
  ''Rate of penetration (ROP) logs'' are recorded at the wellsite as the well is being drilled. The ROP can be ...s one revolution in 8, 12, or 24 hr. To record depth, a small cable is run from the geolograph to the top of the kelly via a pulley on the crown of the der
  7 KB (1,049 words) - 19:02, 20 January 2022
• Seismic facies analysis
  ...on with lithofacies interpreted from [[Quick-look lithology from logs|well logs]], [[Core description|cores]], and [[Mudlogging: drill cuttings analysis|cu ...f> The table below<ref name=ch21r31 /> summarizes the information obtained from each parameter.
  6 KB (809 words) - 17:46, 4 February 2022
• Well log analysis for reservoir characterization
  ...re so many kinds of modern logs, see table 1 for the information about the logs and also their uses. | Gamma Ray (GR) || Lithology interpretation, shale volume calculation, calculate clay volume, permeabili
  25 KB (3,679 words) - 21:17, 13 March 2019
• Cased hole tools
  ...alinity are known. The porosity devices are used to estimate porosity when lithology is known. Table 1 lists the types of devices used for these purposes, and T ...asing, the encountered drop in pressure may cause the salts to precipitate from the waters and deposit on the casing near the perforations. These salts wil
  10 KB (1,427 words) - 16:26, 18 January 2022
• Quick-look lithology from logs
  | chapter = Quick-look lithology from logs ...quick-look interpretation can be made by visual inspection of appropriate logs.
  25 KB (3,637 words) - 19:39, 18 January 2022
• Measurement while drilling
  ...x|thumb|{{figure number|1}}Location of MWD hardware (not drawn to scale). (From <ref name=pt03r5>Anadrill,, 1988, Measurement While Drilling-Formation Logg ...ment-while-drilling_fig3.png|{{figure number|3}}Composite lithological log from MWD data.<ref name=pt03r42>Schlumberger, 1989, Prospector logging while dri
  8 KB (1,083 words) - 21:18, 19 January 2022
• Core description
  Careful examination and recording of information from continuous cores provide critical data for stratigraphic correlation, envir ...s possible. Porosity amounts in percent can be scaled as needed. (Modified from Casey.<ref name=pt05r32>Casey, J. M., 1980, Depositional systems and basin
  13 KB (1,786 words) - 20:50, 19 January 2022
• Procedure for geometrical analysis
  * Missing facies in a sequence, i.e., abrupt change from fluvial sandstone to marine shale * Changes in lithology as seen in cores that indicate subaerial exposure or nondeposition, as evid
  6 KB (862 words) - 15:20, 4 February 2022
• Full waveform acoustic logging
  ...des. P and S wave traveltimes and amplitudes provide information about the lithology and the fluid content of the formation. Stoneley wave velocity and amplitud ...ation interval being 5 μsec. The length of the time window recorded varies from 2 to 10 msec, depending on the source-receiver separations.<ref name=pt07r3
  10 KB (1,530 words) - 20:47, 19 January 2022
• Standard interpretation
  ...the process of determining volumes of hydrocarbons in place from wireline logs, or [[log interpretation]]. This process requires four basic steps: ...The most common methods for estimating shale volumes from gamma ray and SP logs are outlined here. Other measurements can be used under special conditions
  25 KB (3,776 words) - 19:53, 18 January 2022
• Open hole tools
  ...uration. The ''lithology and porosity'' devices are used to determine both lithology and porosity. A variety of ''auxiliary'' tools are used to make special log | rowspan = 3 | Correlation and lithology || Spontaneous potential
  23 KB (3,350 words) - 17:26, 18 January 2022
• Preprocessing of logging data
  ...es or digitized logs to the log processing environment: If paper copies of logs were digitized, all digital log data should be plotted and compared with th ;3. Collect all information related to the logs: Locate the headers for all logs, and identify the logging tool model used on each well and logging run. Col
  13 KB (2,094 words) - 17:42, 18 January 2022
• Well planning
  ...needed for correlation and evaluation. This includes maps, [[offset]] well logs, the well prognosis, and any other data that the geologist believes may be * Lithology
  6 KB (779 words) - 15:09, 24 January 2022
• Water resistivity determination
  The magnitude of deflection from the shale base line to the maximum deflection developed in a thick, clean, ...in example of calculation of water resistivity. Copyright: the SP method. (From Western Atlas International;<ref name=pt04r20>Western Atlas International,
  13 KB (2,077 words) - 17:26, 18 January 2022
• Mudlogging: drill cuttings analysis
  ...well is being drilled. The rock fragments are transported by the mudstream from the bit to the surface where they can be “caught” and analyzed (see [[L ...ee [[Show evaluation]]). Some of the activities that utilize data obtained from drill cuttings are summarized as follows:
  10 KB (1,482 words) - 15:25, 24 January 2022
• 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
• Show evaluation
  ...ogs are the most useful wellsite evaluation tool due to the integration of lithology, [[rate of penetration]] (ROP), gas recordings, and oil description (see [[ ...lation process. Table 1 summarizes the nomenclature of gas that can result from the drilling process. The presence of these gases should not be confused wi
  18 KB (2,670 words) - 18:21, 21 January 2022
• Log analysis applications
  ...oftware. These features make accurate and detailed geological descriptions from wireline data feasible. Now, wireline data are being integrated with geolog ...ium at predetermined sample increments. Increments vary from tool to tool, from service company to service company (even for comparable tools and [http://e
  21 KB (3,142 words) - 16:20, 20 January 2022
• Fault plane profile
  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.
  9 KB (1,461 words) - 21:57, 28 March 2022
• Wireline formation testers
  ...onds, the pistons of the pretest chambers begin to withdraw, causing fluid from the formation to flow into the tool through the packer and probe assembly. ...pressure can be taken when the pressure becomes stable or can be estimated from the character of the buildup if it has not yet stabilized when the tool is
  10 KB (1,446 words) - 17:42, 18 January 2022
• Structural play geology
  ...pes; they account for most of the world's hydrocarbon reserves. They range from very large [e.g., Ghawar, Saudi Arabia (560,000 ac)] to small [Major County ...face data into a cohesive whole. Data include [[Basic open hole tools|well logs]], [[Seismic data - creating an integrated structure map|2-D and 3-D seismi
  18 KB (2,422 words) - 14:21, 2 February 2022
• Geological heterogeneities
  ...left|300px|{{figure number|1}}Levels of reservoir heterogeneity. (Modified from Weber.<ref name=pt06r153>Weber, K. J., 1986, How heterogeneity affects oil ...ling mud]] was used during coring). The use of [[Quick-look lithology from logs#Log shapes|log shapes]] for facies recognition, as well as [[Sidewall corin
  17 KB (2,232 words) - 21:22, 19 January 2022
• Arecuna field
  ...s of 7.5-16° API oil from 35 producing wells. Initial completions were all from vertical wells, and typical flow rates, which were on the order of 200 barr ...}}Location of the Arecuna field study area in the heavy-oil belt (modified from Erlich and Barrett<ref>Erlich, R. N., and S. F. Barrett, 1992, [http://arch
  16 KB (2,381 words) - 19:03, 11 March 2019
• Dolomite and dolomitization: Implications for reservoir characterization
  ...face dolomite or dolostone can be studied using conventional petrophysical logs. Now-a-days, research focused on dolomite precipitation experimentally in t ...ning dolomite and evaporites in Eocene Chorgali Formation, KMR, Pakistan. (from Awais et al., 2020b)]]
  38 KB (4,996 words) - 21:07, 21 April 2022
• Diagenetically complex reservoir evaluation
  ...t, secondary porosity generation, and stylolitization. A [[cross section]] from Longman<ref name=pt06r78>Longman, M. W., T. G. Fertal, and J. S. Glennie, 1 ...step of depositional model construction. The most useful data are derived from slabbed full diameter cores, but recourse to cuttings and sidewall cores is
  31 KB (4,171 words) - 18:22, 21 January 2022
• Biostratigraphic applications in hydrocarbon exploration
  ...e and correlate time-equivalent units over large distances irrespective of lithology that can be variable due to change in environment and basinal configuration ...nge in environmental parameters, different interpretations can be inferred from the fossils record. The use of biostratigraphy can be vital once integrated
  14 KB (1,899 words) - 21:03, 21 April 2022
• Wattenberg field
  .... The overall economics of conventional and unconventional systems benefit from the field growth phenomenon. ...the Niobrara in 1985, and the Dakota Plainview in 1998. Production occurs from approximately 4000 to 8500 ft below the surface across the field. Reservoir
  72 KB (10,249 words) - 20:06, 15 January 2024
• Faults: structural geology
  ...ismic interpreter whereas the production geologist analyzes the structures from core and log data. Having established a fault framework for a field, it is ...ndon) Special Publication 292, p. 25–48.</ref>). Reprinted with permission from the Geological Society.]]
  63 KB (9,496 words) - 16:51, 15 January 2024
• Carbon dioxide (CO2) storage
  ...J., A. J. Rigg, and J. Bradshaw, 2000, Putting it back from where it came from: Is geological disposal of carbon dioxide an option for Australia: The Aust The CO₂ storage in [[Coal|coalbeds]] is very different from the storage in oil and gas fields or saline formations because the trapping
  37 KB (5,487 words) - 21:14, 11 March 2019
• Appalachian Basin Marcellus gas play
  ...province since the early 1800s, with an estimated 3.0 tcf already produced from Devonian black shale.<ref name=Dw1986>de Witt Jr., W., 1986, [http://archiv ...e formation's reservoir characteristics and economic potential. Production from the Marcellus Shale is expected to exceed 1 billion cubic feet (gas equival
  89 KB (13,415 words) - 19:16, 16 January 2024
• West Texas Super Basin
  ...s lead an independent to change exploration strategy based on observations from a team evaluating subsurface data and information and knowledge of discover The oil price drop from 2014 to 2016 resulted in a decrease of investment and the number of drillin
  157 KB (23,278 words) - 18:36, 16 January 2024