Show geologists avoid dry oil wells when MI an oh oil well drilling outfit moves into the field and sets up a rig ft you can be b assured the company hai has pretty good evidence that piat oil will be found geologist geologists know their chances of finding a paying formation under any given pot spot are lender slender but that te Is their fob job and considering the difficulties they do it surprisingly well the crust of 0 the earth Is thick however the geologist knows how to locate ancient sea beds which now are oil reservoirs and in outcrop outcropping outcroppings out pings and surface indications he finds clues to the underground wrinkles which may have trapped it once a held field has been discovered he watches test cores from every well until he has a picture of the forma formation Uon its extent and the source of pressure the geologist geologists eyes are only the first tint to be focused on the area after he be has outlined the general cite site geophysicists take over to pinpoint the most likely drilling location geophysical crews use delicate instruments to measure variations in the earths magnetic field and gravitational pull for clues to what lies beneath the surface their major tool though is the seismograph which records shock waves in the earths crust by setting oft off explosions and measuring the time it takes tor for the waves to reach deep rock strata and bounce back the geophysicist can often map underground contours quite accurately when a location has been selected the company lays down its blue chips and move moves in a drilling rig then if it all goe goes well and every one has been right in their calculations and findings an oil well may be brought in |