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Re: Because of its accuracy in outlining the Earth's subsurface,
[#permalink]
25 Jul 2022, 23:16
25 Jul 2022, 23:16
Carcass wrote:
17. The passage is primarily concerned with
(A) describing an important technique
The passage describes about a technique and how it is performed to deliver a positive result
(B) discussing a new method
wrong
(C) investigating a controversial procedure
wrong
(D) announcing a significant discovery
wrong
(E) promoting a novel application
Basically as B.
18. According to the passage, in the seismic-reflection method all of the following have a significant effect on the signal detected by the seismic instruments EXCEPT the
(A) presence of unrelated wave trains
(B) placement of the seismic instruments
(C) number of sources in the grid pattern
the seismic-reflection method remains the most important tool in the search for petroleum reserves. In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern.
The number is not mentioned. C is the correct answer
(D) nature of the reflectivity of the rock interfaces
(E) properties of rocks through which the wave train has traveled
19. It can be inferred from the passage that the seismic-reflection method would be likely to yield an inaccurate physical profile of the subsurface in which of the following circumstances?
(A) If the speed at which the wave train moved downward changed
(B) If the receiver were not positioned directly at the wave-train source
(C) If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side
The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces.
If all the process described above was similar then would be inaccurate. We do need the differences and then those are adjusted.
(D) If the seismic records obtained for the different sources in a grid were highly similar to each other
(E) If there were no petroleum deposits beneath the area defined by the grid of wave-train sources
20. Which of the following best describes the organization of the passage?
(A) A method is criticized, and an alternative is suggested.
(B) An illustration is examined, and some errors are exposed.
(C) An assertion is made, and a procedure is outlined.
The technique to discover the petroleum is asserted, it is still an important element to find new reservoir and how it is connected is explained.
(D) A series of examples is presented, and a conclusion is drawn.
(E) A hypothesis is advanced, and supporting evidence is supplied.
(A) describing an important technique
The passage describes about a technique and how it is performed to deliver a positive result
(B) discussing a new method
wrong
(C) investigating a controversial procedure
wrong
(D) announcing a significant discovery
wrong
(E) promoting a novel application
Basically as B.
18. According to the passage, in the seismic-reflection method all of the following have a significant effect on the signal detected by the seismic instruments EXCEPT the
(A) presence of unrelated wave trains
(B) placement of the seismic instruments
(C) number of sources in the grid pattern
the seismic-reflection method remains the most important tool in the search for petroleum reserves. In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern.
The number is not mentioned. C is the correct answer
(D) nature of the reflectivity of the rock interfaces
(E) properties of rocks through which the wave train has traveled
19. It can be inferred from the passage that the seismic-reflection method would be likely to yield an inaccurate physical profile of the subsurface in which of the following circumstances?
(A) If the speed at which the wave train moved downward changed
(B) If the receiver were not positioned directly at the wave-train source
(C) If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side
The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces.
If all the process described above was similar then would be inaccurate. We do need the differences and then those are adjusted.
(D) If the seismic records obtained for the different sources in a grid were highly similar to each other
(E) If there were no petroleum deposits beneath the area defined by the grid of wave-train sources
20. Which of the following best describes the organization of the passage?
(A) A method is criticized, and an alternative is suggested.
(B) An illustration is examined, and some errors are exposed.
(C) An assertion is made, and a procedure is outlined.
The technique to discover the petroleum is asserted, it is still an important element to find new reservoir and how it is connected is explained.
(D) A series of examples is presented, and a conclusion is drawn.
(E) A hypothesis is advanced, and supporting evidence is supplied.
What is the idea behind the seismic recordings? It is to avoid the "hard rock" on the earth crust while drilling for oil reserves, right? Or they want the location of "hard rocks" and drill on that part of the rock?
If its to avoid the "hard rocks", then in Q19, option C, the similarities of the rock characteristics means that the Rock is not hard on the other side and the seismic wave wouldn't record anything, doesn't this in favor for this procedure?,
Re: Because of its accuracy in outlining the Earth's subsurface,
[#permalink]
26 Jul 2022, 02:25
26 Jul 2022, 02:25
Carcass wrote:
Basically this is a weaken the argument question.
IF we do know from the information in the passage that X occurs, then if X will NOT occours we will weaken the argument
As rock interfaces are crossed,
The roks are crossed by signals
the elastic characteristics encountered generally change abruptly,
based on the rock elasticity the waves changed direction. I.E the rock is really solid the waves changes is > when a rock is more elastic because the impact is absorbed more
which causes part of the energy to be reflected back to the surface,
hard rock= wave more reflection back. I.E a greater bounce
elastic rock= smaller bounce back
where it is recorded by seismic instruments.
we record all these data
The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains,
the hypothetical line between the sender (rock) and the receiver (the radar) is balanced t avoid devisations
(C) If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side
If the different rocks are similar, our waves are similar and our data to process are similar. If all these data are alike in meaning we are not able to spot the differences.
therefore, we will NOT be able to see the differences among rocks and we are not able to find what we are looking for
I hope now is clear.
You must read carefully. Thje answer is there. Pretty straight
IF we do know from the information in the passage that X occurs, then if X will NOT occours we will weaken the argument
As rock interfaces are crossed,
The roks are crossed by signals
the elastic characteristics encountered generally change abruptly,
based on the rock elasticity the waves changed direction. I.E the rock is really solid the waves changes is > when a rock is more elastic because the impact is absorbed more
which causes part of the energy to be reflected back to the surface,
hard rock= wave more reflection back. I.E a greater bounce
elastic rock= smaller bounce back
where it is recorded by seismic instruments.
we record all these data
The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains,
the hypothetical line between the sender (rock) and the receiver (the radar) is balanced t avoid devisations
(C) If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side
If the different rocks are similar, our waves are similar and our data to process are similar. If all these data are alike in meaning we are not able to spot the differences.
therefore, we will NOT be able to see the differences among rocks and we are not able to find what we are looking for
I hope now is clear.
You must read carefully. Thje answer is there. Pretty straight
Thank you for taking your time and explaining it. Really Appreciate it.
So, they are using the seismic recordings to avoid the "hard rocks" while drilling, right?
Also, after looking at your explanation, i came to infer that, similar characteristics of a rock does not help.
1) if the first rock is hard, and the second rock is hard as well, the seismic response will be useless.
2) if the first rock is soft, and the second rock is soft as well, the seismic response will be useless.
3) if the first rock is soft, and the second rock is hard, the seismic response will be helpful here, so as to avoid the hard rock while drilling?
Re: Because of its accuracy in outlining the Earth's subsurface,
[#permalink]
26 Jul 2022, 02:48
26 Jul 2022, 02:48
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