CY TRUE FALSE Conductivity is an ability of certain element to flow current or e
ID: 293684 • Letter: C
Question
CY TRUE FALSE Conductivity is an ability of certain element to flow current or electricity The resistiuty of geologic unit largely depends on their fiuid content porosity fracture, density, temperature, and content of conductive minerals. TRUE FALSE I FALSE TRUE |FALSE A stronger signal and slower rate of decay (EM impulse) indicate higher resistivity in the subsurface, and vice versa TRUE SBL is a marine electromagnetic method that has the ability to map the TRUE FALSE SBl uses a mobile vertical electric dipole (HED) source transmitting a low frequency electromagnetic signal and an array of seafloor electric field receivers Fault is an example of oil and gas trap, TRUE FALSE TRUE FALSE Seismic Surveys provide the most detailed picture of subsurface geology, it can detect large-scale to small-scale subsurface features Measure the physical properties of rocks that are related to potential traps in TRUE reservoir rocks as well as documenting regional structure trends and overall basin geometry ALSE Seismic waves travel at known but varying velocities depending upon the kinds TRUE FALSE of rocks through which they pass. Seismic waves usually varies inversely with density and directly with porosity. TRUE FALSE Typical sources of seismic for land surveys are truck-mounted vibrating sources (vibroseis) or small dynamite charge sources (explosives) TRUE FALSE Two way time is the time taken for a surface-generated seismic wave to reach a TRUE FALSE subsurface rock layer and return to the surface TRUE FALSE Reflections of seismic are generated at unconformities and separate rocks having same physical properties Reflection seismic is the most widely used technique in hydrocarbon exploration. TRUE FALSEExplanation / Answer
1) Conductivity of a medium is defined as the ability of the medium to conduct electricity. We cannot specify the property for an element. Therefore the given statement is False.
2) The resistivity is completely dependent upon the nature of the material used. Therefore it depends upon the porosity, fluid content, density, temperature and density as all these factors might influence the resistivity of the material. Therefore the statement is True.
3) A stronger signal would be generated when the resistivity of the encountered subsurface material is higher than the usual ones. And the decay rate of signal is less only when the encountered material is higher with conducting materials. Therefore the statement is true.
4) SBL technique is general use of mobile horizontal electric dipole in order to establish the map of the subsurface of the ocean floor. Hence the given statement s True.
5) The given statement is true. The reason is given in the above statement.
6) Faults can act as a trap for the hydrocarbon reserves like oil and gas. The roll over anticlines which are generally associated with the extensional fault regimes are considered to be one of the traps for the hydrocarbon reserves and hence can be fruitful for the persons looking for ne. Hence the statement is True.
7) One of the limitations of the seismic surveys are that they cannot be used for small scale surveys as the seismic waves might not travel from the locally organised anomalous materials located in the subsurface. Hence the Gravity method and magnetic surveys are generally followed in order to conclude the datas obtained. Therefore the statement is False.
9) The velocities of the seismic waves are always dependent upon the nature of the material that it is passing through. Therefore the statement is True.
10) The seismic waves are more and more atrracted to the materials bearing higher porosity as the waves can pass through them. But on ther other hand the seismic gets deflected by encountering the higher density materials. Therefore they are inversely related to density and directly related to porosity. Therefore the statement is true.
11) Seismic waves can be generated in 2 major ways, one being the natural or the earthquake and the second may be the artificial or the man made way. The artificial means of generating the seismic waves can be achieved by creating a heavy impulse on the land thus generating a series of seismic waves. Thus the statement is true.
12) Two way time is one of the processes of time transfer where the 2 peers will boh transmit and receive the messages simultaneously. Therefore the given statement is false.
13) Reflections of the seismic waves are only generated when the seismic waves has encountered any irregularities which may be in the form of unconfirmities, faults ,folds etc. Therefore the given statement is true.
14) Reflection method is generally used for exploration of rhe ocean where the shots points are made out and seismic waves are sent into the ocean in order to know about their lithologies and specifications. Therefore the given statement is False.