Property:Pitfalls

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Property Name Pitfalls
Property Type Text
Description List of potential pitfalls that could be encountered while applying this technique.


Pages using the property "Pitfalls"

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2

2-M Probe Survey +The potential problems with drilling the hole using a hand soil auger are that the temperature measurement could be influenced by shallow soil entering the hole, rocky soils are difficult to penetrate, and the holes may collapse if drilled in loose ground. The potential problems with using a thermistor instead of a thermocouple probe is that it is much more delicate and could be damaged during the creation of the 2m hole.

A

Acoustic Logs +An unstable well bore (sluffing, wash outs, etc) can be of concern in any well logging operation. In extreme condition, the loss of the logging tool down hole could possibly result in the loss of the hole and would require premature abandonment or the necessity to side track to complete the well drilling operation.
Active Sensors +Active remote sensing techniques can be very useful, however in order to make direct temperature measurements, collect samples, and preform most geophysical methods in situ field work is required.
Aeromagnetic Survey +<br> * In the past, magnetic surveys were used to determine Curie isotherm depths (i.e., the depth at which temperatures are high enough to cause rock demagnetization), which could be used to indicate depth to thermal anomalies, but subsequent work has proven otherwise.
Airborne Electromagnetic Survey +Some areas are not appropriate for airborne electromagnetic surveys. These include semi-arid areas, particularly with internal drainage, and tidal coasts and estuaries. Also the background conductivity can influence the accuracy of the results. For example, weathered maific flows can provide strongly conductive backgrounds masking other signals. There are multiple factors that can influence the detectability of the conductor which need to be accounted for when analyzing the data. These include among many coverage, resolution, and the penetration depth of the system.
Analytical Modeling +Analytical modeling can become more complicated if the number of variables solved for increases.
Audio-Magnetotellurics +See [[Magnetotelluric Techniques]]

C

Caliper Log +An unstable well bore (sluffing, wash outs, etc) can be of concern in any well logging operation. In extreme condition, the loss of the logging tool down hole could possibly result in the loss of the hole and would require premature abandonment or the necessity to side track to complete the well drilling operation.
Cement Bond Log +Even expert analysis of a cement-bond logs will not always locate all channels through the cement accurately.
Conceptual Model +When only one conceptual model is developed, there is sometimes a tendency to interpret data to fit that model. Therefore, it is important to develop multiple possible conceptual models that are consistent with all data, so that, as additional data are collected, the model(s) can be adjusted based on the new information. The exploration plan may still target the elements of the most likely model, but probabilities should be estimated for all models to consider the risks being taken for each.
Cross-Dipole Acoustic Log +An unstable well bore (sluffing, wash outs, etc) can be of concern in any well logging operation. In extreme condition, the loss of the logging tool down hole could possibly result in the loss of the hole and would require premature abandonment or the necessity to side track to complete the well drilling operation.

D

DC Resistivity Survey (Dipole-Dipole Array) +''See [[Direct-Current Resistivity Survey]]''
DC Resistivity Survey (Mise-A-La-Masse) +''See [[Direct-Current Resistivity Survey]]''
DC Resistivity Survey (Pole-Dipole Array) +See [[Direct-Current Resistivity Survey]]
DC Resistivity Survey (Schlumberger Array) +See [[Direct-Current Resistivity Survey]]<br><br> • Substantial lengths of cable energized with current at high voltage present a safety hazard.<br><br> • The Schlumberger array is a labor-intensive survey because of the cable lengths required and the movement of the electrodes during the survey.<br><br>
DC Resistivity Survey (Wenner Array) +See [[Direct-Current Resistivity Survey]]<br><br> • The Wenner array is a labor-intensive survey because of the cable lengths required and the movement of the electrodes during the survey.<br><br> • Substantial lengths of cable energized with current at high voltage present a safety hazard.<br><br>
Data Collection and Mapping +Limitations and poor implementation practices are specific to the individual technique to be applied, and may also be influenced by characteristics of the geothermal area under study. Consult the individual technique pages linked in the “Related Techniques” section above for information regarding potential pitfalls to avoid when applying different data collection techniques in the field.
Density Log +An unstable well bore (sluffing, wash outs, etc) can be of concern in any well logging operation. In extreme condition, the loss of the logging tool down hole could possibly result in the loss of the hole and would require premature abandonment or the necessity to side track to complete the well drilling operation. It is important to minimize the mud between the sensors, the source and the detector, because that can impact the accuracy of the signal. Also, changes in the borehole diameter can affect the measurement and provide inaccurate results because the distance between the source and the detector can change with depth in the well.
Development Drilling +-Development drilling is expensive and time consuming, unsuccessful drilling efforts may lead to failure of a project. -Development drilling can be dangerous. -Development drilling requires a drilling pad which needs a small amount of land to be cleared for the drilling rig and all associated equipment. In many locations access roads need to be constructed so all the drilling equipment can be transported to the drilling location.
Drilling Techniques +-Drilling is expensive and time consuming, unsuccessful drilling may lead to failure of a project. -Drilling can be dangerous. -Most drilling methods need a drilling pad which requires a small amount of land to be cleared for the drilling rig and all associated equipment. In many locations access roads need to be constructed so all the drilling equipment can be transported to the drilling location.

E

Electromagnetic Techniques +See [[Electrical Techniques]]

F

Fluid Inclusion Analysis +Having an unqualified fluid inclusionist analyze the sample and generate inaccurate data. It is very easy to misinterpret fluid inclusions and get data that is not representative of the true fluid composition or evolution. It is important to recognize that a fluid inclusion assemblage represents a single fluid’s physical and chemical properties at that particular point in time and space. While a fluid inclusion assemblage immediately adjacent could have very different chemical and physical characteristics representing a different fluid from a different point in the evolution of the hydrothermal system.

G

Gamma Log +Mostly shales and sandstones account for most of the gamma radiation. However, there are some other rocks such as some carbonates or feldspar rich rock types that produce radiation and could hinder the accurate detection of the sands and shales.
Gravity Techniques +The gravity method produces an ambiguous, non-unique solution for the subsurface structure. The density distribution is the product of the mass and the volume of the body in the subsurface. Therefore, many combinations of mass and volume may result in the same anomaly as portrayed in the gravity data. Additional geophysical techniques or geological evidence may be required to reduce the ambiguity and further constrain the gravity model.
Ground Gravity Survey +See [[Gravity Techniques]]
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