Bulletin of the Geological Society of America, Band 3

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Vols. for 1938-61 include as pt. 2 of the December issue the Society's Abstracts, later published separately.
 

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Seite 206 - The reason why natural gas should collect under the arches of the rocks is sufficiently plain, from a consideration of its volatile nature. Then, too, the extensive fissuring of the rock, which appears necessary to form a capacious reservoir for a large gas well, would take place most readily along the anticlinals where the tension in bending would be greatest.
Seite 205 - I found that every one of them was situated either directly on or near the crown of an anticlinal axis, while wells that had been bored in the synclines on either side furnished little or no gas, but in many cases large quantities of salt water. Further observation showed that the gas wells were confined to a narrow belt, only one.fourth to one mile wide, along the crests of the anticlinal folds. These facts seemed to connect gas territory unmistakably with the disturbance in the rocks caused by...
Seite 206 - Probably very few or none of the grand arches along mountain ranges will be found holding gas in large quantity, since in such cases the disturbance of the stratification has been so profound that all the natural gas generated in the past would long ago have escaped into the air through fissures that traverse all the beds.
Seite 205 - Where we formerly had 90 firemen at work in one boiler house, and were using 400 tons of coal per day, a visitor now walks along the long row of boilers and sees but one man in attendance. The house being whitewashed, not a sign of the dirty fuel of former days is to be seen ; nor do the stacks emit smoke. In the Union iron mills our puddlers have whitewashed the coal-bunkers belonging to their furnaces.
Seite 204 - In the manufacture of glass, of which there is an immense quantity made- in Pittsburg, I am informed that gas is worth much more than the cost of coal and its handling, because it improves the quality of the product. One firm in Pittsburg is already making plate glass of the largest size, equal to the best imported French glass, and is enabled to do so by this fuel.
Seite 100 - Schumard knobs; ancient volcanic necks or laccolites "bordering the Rio Grande embayment, begun in later Cretaceous time, the lava sheets of which have been obliterated by erosion. 2. The lava flows of the Raton system, which are fissure eruptions of Tertiary time, and which are only partially removed by erosion. 3. The cinder cones and lava flows of the Capulin system, which are late Pleistocene, and which still maintain their original slope and extent.
Seite 205 - The writer's study of this subject began in June, 1883, when he was employed by Pittsburg parties to make a general investigation of the natural gas question with the special object of determining whether or not it was possible to predict the presence or absence of gas from geological structure. In the prosecution of this work I was aided by a suggestion from Mr. William A. Earseman, of Allegheny, Pennsylvania, an oil operator of many years...
Seite 209 - ... failure to grasp this fact is the principal reason why Mr. Ashburner insists upon his readers believing that a great gas well may be obtained in a syncline ; for it is quite certain that no large gas well has ever yet been found in the trend of a...
Seite 206 - In reply to Mr. Ashburner's criticism of the views advanced in my article on natural gas, I would say that the necessary brevity of the paper in question prevented the mention of many facts that might have rendered the conclusions clearer and less open to challenge. One of these is that my communication had especial reference to the natural gas regions proper, ie, where the gas is unconnected with the oil fields.
Seite 206 - The arch in the rocks must be one of considerable magnitude. (b) A coarse or porous sandstone of considerable thickness or, if a fine-grained rock, one that would have extensive fissures, and thus in either case rendered capable of acting as a reservoir for the gas, must underlie the surface at a depth of several hundred feet (500 to 2,500).

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