Solve question starting from question 5 onwards PDB 1023: INTRODUCTION TO PETROL

Question

Solve question starting from question 5 onwards

PDB 1023: INTRODUCTION TO PETROLEUM GEOSCIENCE EXERCISE2 TRUE OR FALSE Gravity Surveys make use of the Earth's magnetic field to determine the presence of gravity anomalies Gravity Surveys data may be collected on land, at sea or by air. Gravity Surveys can be obtained and used where seismic data are difficult to acquire, higher cost than seismic survey, resolution is lower than seismic survey Gravimeter measures anomalies of the Earth's density Gravitational attraction would be the same everywhere on the surface if Earth was perfectly spherical, homogeneous throughout, and not rotating A gravity reading higher than the normal regional gravity is called a negative anomaly Gravity anomalies are caused by the heterogeneous distributions of rocks of TRUE FALSE TRUE FALSE TRUE | FALSE TRUE FALSE TRUE FALSE TRUE FALSE TRUE | FALSE different density TRUE FALSE netic survey, the objective is to ascertain the presence of metamorphic basins and to map their approximate boundaries. Magnetic Surveys provide the quickest and least expensive way to study gross TRUE FALSE subsurface geology over a broad area. igneous rock formation at shallow depth will affect the magnetometer more strongly than a similar mass at great depth TRUE FALSE TRUE FALSE A magnetmeter is an instrument used to measure the strength of Earth's magnetic field TRUE FALSE Regional magnetic anomalies may be due to circulation patterns in the solid outer core TRUE I FALSE A negative magnetic anomaly is a reading of magnetic field strength that is higher than the regional average FALSE nomaly can be used to calculate thethicknessTRUE The magnitude of the magnetic a of the sedimentary rocks

Explanation / Answer

5) True

gravitational attraction will be same in this condition, since inhomoginity, shape and rotation are the factors that changes the gravity on earths surface.

6)False

gravity greater than the normal value is a positive gravity anomaly.

7)True

variation of density of underground rocks will makes changes in the gravity.

8) False

magnetic survey conduct to find the regions of minerals which have a magnetic property.

9)True

magnetic survey can be done fast compare to other methods, and it will gives the idea about the geology of that area in terms of magnetic anomalies.

10)True

shallow depth regions will have greater influence on magnetometer.

11)True

magnetometer measures the earths magnetic field, some of the instruments can measure the difference of magnetic field in the region.

12)True

regional anomalies are the major component of earths magnetic field that originated by the circulations in the liquid outer core.

13) False

a negative magnetic anomaly is less than the regional average.

14)TRue

from the variations of magnetic anomalies we can calculate the thickness of sedimentary regions.

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