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==Accuracy of measured pressures== ...gauges measure pressures: strain and [[quartz]]. The table below shows the accuracy and precision of both types.

==Accuracy== This method's accuracy mainly depends on estimates of mud weight. The accuracy of mud weight estimates, measured periodically from the mud pits at the wel

...cepted range of measurement accuracy and a list of factors that may affect accuracy, productivity, and cost. ...able number|1}}Gravity methods and factors affecting production, cost, and accuracy

...anges may limit correlation accuracy. Six main problems limit the utility, accuracy, and confidence of correlations:

...s a good initial interpretation. However, the true measure of merit is the accuracy of the predictions inherent in this first hypothesis and the robustness of

...able, and the choice of method generally depends on a tradeoff between the accuracy necessary and the desired computing time. In general, the type of data to b ...tions can be added, though at high computing times and never with complete accuracy. Ray methods are the methods of choice for many structural verification pro

...condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and [[Petroleum reservoir fluid properties#So

One of the most critical parameters in typical surveys is the high accuracy needed in elevation control. Submeter accuracies are usually necessary, exc

...sive review of error sources for mechanical orientation and comparisons of accuracy with other techniques. Core orientation techniques are capable of achieving ...the core tend to precess along the length of the core. Hence, orientation accuracy in part depends on the ability to recognize and quantify these effects. Nel

...rmines the accuracy of your geological interpretation. If you question the accuracy of any part of the base map, consult with the person who drafted the map or

...ssociated or connected with this Web site. AAPG is not responsible for the accuracy of information contained in any downloaded article, publication, or other p

...ch as computational efficiency, accuracy for imaging steep reflectors, and accuracy in the presence of spatial variation of velocity. Likewise, each can produc The additional accuracy of either DMO or prestack migration over that of conventional poststack mig

Density information can improve the accuracy of a stratigraphic model for seismic analysis.

...easured at two depths. The accuracy of the computed density depends on the accuracy of both measured differences: gravity and depth. Operationally, BHGM survey

| Focus on generalities and play concepts. Check all data for accuracy. The goal is to gain commitment of capital early in the exploration process

...ge three or four independent estimates derived from the same data set, the accuracy of the final estimate will nearly always be substantially improved. ==Accuracy levels in geotechnical predictions==

...chips, they estimated formation permeability from cuttings with surprising accuracy. Although Sneider and King<ref name=ch09r57 /> describe the method for esti

...s performed. It should match the IHP within 5 psi as a check of the tool's accuracy (assuming the packers did not leak).

| Convenient to use || Enhanced accuracy results from measurement of pressure versus time instead of rate ...ariables by multiple measurements and statistical calculations. Typically, accuracy of measured permeabilities decline at low and high values and are usually w

...re control the geoscientist has in mapping the subsurface, the greater the accuracy of the maps. Control can be increased by the correlation of [[seismic data]

Computers can measure depth and ROP with a high degree of accuracy and sensitivity. However, it must be remembered that virtually all methods

...ate paleobathymetry as far back as the middle Miocene (about 14.5 Ma). The accuracy of this method decreases with geologic age but is generally accepted to be

...ng whether it is 2, 5, or [[length::10 km]] thick, for example, to a usual accuracy of about ±15% under favorable conditions.

...en ratio along the line can be associated with a unique numerical age. The accuracy of the resulting age estimates approaches ±1.0 m.y for the [[Cenozoic]] in

...s only an approximate answer (typically within one or two porosity units). Accuracy decreases with increasing shale content and gas effects. ...g saturation in clean sands. It can be calibrated with cores for increased accuracy.

...determining ''x'', ''y'', and ''z'' coordinates generally provide adequate accuracy, given sufficient control. However, in remote or previously unsurveyed area

...tzgerald, D. D., B. F. McGhee, and J. A. McGuire, 1983, Guidelines for 90% accuracy in zone isolation decisions: Richardson, TX, Society of Petroleum Engineers

The sponge-lined coring system was developed to improve the accuracy of core-based oil saturation data. This is very important information to ha

...thermal resolution, and the thermal range in which it can be applied with accuracy. Sensitivity studies demonstrate that reconstruction of the local paleoheat

...rs. Details of geological map depend on the its scale, and the density and accuracy of observations in the field. The final result from all [[geological method # The accuracy and precision of geological map is mainly based on the scale of the map tha

...fact that ''ground truth'' is normally assumed to be core measurement—the accuracy of which varies significantly depending on procedure and how well samples r

The intervals can be defined in several ways depending on the accuracy and simplicity of calculation required. The ''tangential'' or ''terminal an

The advent of 3-D seismic has increased the demand for accuracy in positioning. One needs to know within a few meters the position of the s

! Method || Application || Accuracy

...ected and those inside the error bars are accepted. If the estimate of the accuracy of the temperature data was less precise, the least squares approach might

...major diagenetic components represented on the vertical well profiles. The accuracy of and confidence in these correlations are governed by such factors as (1) Where [[economics]] dictate, it may be necessary to test the accuracy of the models developed. This can include testing by history matching of pr

...nature of the data set and outliers or anomalous data points to review for accuracy or measurement error and can indicate the spread or variability of the data

...; the decision must always depend on the interest of the experimenter, the accuracy and urgency of the required prediction, and the availability of other techn

...displacement accounts for the additional tool joint volume with sufficient accuracy. Using the data from the previous example, we obtain the following the disp

...grid overlain on the field or field segment being studied. In general, the accuracy of results from simulation studies is greater for smaller grid block sizes.

...mud weight and wellbore flushing, operation of the surface mud system, and accuracy of calculated lag time (see chapter on “Mudlogging: Gas Extraction and Mo

...[dipmeter]], and hydrocarbon distribution information that can improve the accuracy of predrill seismic and geological interpretations. Time pick corrections a

...World Oil, v. 200, n. 4, p. 83-90.</ref> The economic implications of the accuracy and credibility of the data obtained from these analyses can be significant

...correlation subsection. Knowledge of lithology significantly improves the accuracy of interpretation of all the porosity measurements.

...e downhole vibration on surface drilling parameters to avoid poor drilling accuracy, failures, and non-productive time from wear and tear in the drilling equip

...able to determine porosity. Sample type, pore types, time constraints, and accuracy requirements are generally used to determine the best analytical technique

...osteering was used to pilot the hole along the oil-water contact with full accuracy. Bed thicknesses differed from prognosed but precise monitoring of well tra

...he straight-line portion of the data to ''P''*. Use a data band within the accuracy of the gauge to make sure you choose the correct slope. In other words, if

* Daneshy, A. A., 2004, On the accuracy of in-situ stress measurements by hydraulic fracturing, ''in'' Proceedings

...y<ref name=Ortz />. However, the median values need to be scrutinized with accuracy because reservoir properties and fluid types vary significantly both among