The economics of petroleum . )ecome commercially productive in time, butsuch fields nmst first be prospected and developed. A clear dis- 322 MEXICO AS A SOURCE OF PETROLEUM tinction should be drawn between the proven oil-jwols alreadyapproaching exhaustion, and the undiscovered and the undevelopedfields of the Republic, which have a significance that the futurealone can Fig. 147.—Production of crude petroleum in Mexico compared with the UnitedStates and all other countries by years, 1901-1920. Occurrence of Petroleum in Mexico.—In the Tampico-Tuxpamregion petroleum occurs under high
The economics of petroleum . )ecome commercially productive in time, butsuch fields nmst first be prospected and developed. A clear dis- 322 MEXICO AS A SOURCE OF PETROLEUM tinction should be drawn between the proven oil-jwols alreadyapproaching exhaustion, and the undiscovered and the undevelopedfields of the Republic, which have a significance that the futurealone can Fig. 147.—Production of crude petroleum in Mexico compared with the UnitedStates and all other countries by years, 1901-1920. Occurrence of Petroleum in Mexico.—In the Tampico-Tuxpamregion petroleum occurs under highly specialized geological conditionswithout parallel elsewhere. The oil exists in cavernous reservoirs under such conditions of enormous pressure, unrestricted mobility,and easy availability, as to enable its entire withdrawal from anyof the important pools within a few months under the intensive OCCURRENCE OF PETROLEUM IN MEXICO 323 development campaign which has raged ... in the Mexican important pools are found to contam from 100 to 150 milKonbarrels of oil each; from the Los Naranjos pool in 1920 was taken95 milhon barrels, or two-thirds of its probable total content. The conditions of occurrence give rise to the largest producingweUs in the worlds history, both as to the volume of dailv vield and
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