GRAVIMETRIC SURVEY
Magnitude of gravitational pull of underground rock varies directly to its density. Sedimentary rocks at oil reservoir have different gravitational attraction.
MAGNETIC SURVEY
Oil bearing sedimentary rocks lie on the top of ignitious rocks. The rocks that contain higher concentration of iron and other magnetic material.So the magnometer detects minute difference in magnetic properties of various rock formation. And help to find rocks or structures containing oil.
SEISMIC SURVEY
Controlled exploration is made to shallow holes. Seismograph measure the velocity of shock waves. Some waves are reflected back which are determined by geologists.
No comments:
Post a Comment