6. Geophysical survey for hydrocarbon prospecting includes: Seismic Surveying: It is the most common method used for hydrocarbon prospecting. Seismic surveying involves generating seismic waves using explosives or vibrators and recording the waves as they reflect off sub-surface formations. The data collected by seismic surveying is used to create a 3D image of the sub-surface formations, which can be used to identify potential hydrocarbon reservoirs. Gravity Surveying: It is used to measure the density of sub-surface formations. The data collected by gravity surveying is used to identify potential hydrocarbon reservoirs based on the density contrast between the reservoir and the surrounding formations. Magnetic Surveying: It is used to measure the magnetic properties of sub-surface formations. The data collected by magnetic surveying is used to identify potential hydrocarbon reservoirs based on the magnetic contrast between the reservoir and the surrounding formations