Petrology

“ Another cause which is seemingly applicable in many cases is hydrostatic pressure, where under certain structural conditions the pressure of water in a long-tilted layer is exerted against oil accumulated toward the top of an anticline (or upbend) in the strata.
The world’s output of petroleum for 1917 was nearly 559,000,000 barrels, of which the United States produced nearly 338,000,000 barrels, Mexico 87,000,000 barrels, and Russia 34,000,000 barrels of 42 gallons.
Natural Gas. The most perfect fuel with which nature has provided us is natural gas. ”

“ The distillation of petroleum from shales was first undertaken in France in 1834, and was successfully introduced into Scotland in 1850. The importation of shale oil into America led to the use of cannel coal for distilling; this industry gained considerable importance in the United States previous to 1860, but quickly succumbed when the first wells became productive.
Origin and Geological Occurence. The geological history of petroleum and natural gas are closely connected, so that what is said of one practically holds true of the other. Petroleum is always found in sedimentary rocks. ”

“ Petroleum as a Fuel and Gas-Producer.—The use of gasolene in gas-machines is well known, and sometimes naphtha has been used to enrich coal-gas, by decomposing its vapor at a cherry-red heat, so as to produce a gas rich in heavy hydrocarbons, which is mixed with the coal-gas. Crude petroleum has also been conducted continuously into red-hot cast-iron retorts, whereby it is decomposed and rich gas formed. ”

“ On the other hand, the bituminous shales which underlie the different oil regions afford an abundant source of supply, holding the proper relations with the reservoirs that contain the oil, and are spontaneously and constantly evolving gas and oil, as may be observed in a great number of localities. For this reason, while confessing the occurrence of petroleum and asphaltum in many limestones, I am thoroughly convinced that little or none of the petroleum of commerce is derived from them. ”

“ In addition to the hydrocarbons, which are the chief constituents of petroleum, the following substances may be present: Sulphur, nitrogen, hydrogen sulphide, carbon disulphide, arsenic, and phosphorus. The carbon percentage may vary from 79.5 to 88.7 per cent.; the hydrogen from 9.6 to 14.8 per cent.; the sulphur from 0.7 to 2 per cent., and in rare cases even 3 per cent.; nitrogen from 0.008 to 1.1 per cent. The hydrocarbons of all crude petroleums fall either into the paraffin or olefin group, those of America belonging chiefly to the first and those of Russia to the second group. ”

“ Extraordinary indications of oil and gas extend over a strip of country twenty-five miles long by a half-mile wide, in porous sandstone. Springs of heavier petroleum flow from hills of volcanic rocks in the vicinity. Open wells, in which the oil settles as it oozes from the rocks, are dug sixteen to twenty feet deep. For countless generations the simple natives dipped up the sticky fluid and carried it great distances on their backs, to burn in its crude state, besides sending a large amount yearly to the Shah’s dominions. ”

“ The petroleum industry, in many of its aspects, is the product of development. This statement is true, not only as respects its vast magnitude, but also as pertaining to many of its details. The process of cracking had been employed in treating the distillates from coal before petroleum became an article of commerce; yet petroleum, for a number of years following its discovery in large quantities, was uniformly distilled into naphtha, normal burning-oil, and paraffine-oil. ”

“ Not a few of the leading scientists hold to the theory that petroleum is derived from metallic carbides lying far beneath the porous strata in which the oil is stored by Nature, and that even at the present time the process is in operation. This idea, which may be termed the inorganic theory of petroleum origin, was considered to have received substantial support when it was found that the action of water on the carbides of certain metals resulted in the liberation of hydrocarbons. ”

“ I think this discovery also supports the theory that the origin of petroleum in nature is produced by moderate heat on coal or similar matter of a vegetable origin. For we know from the researches of Freund and Pebal (Ann. Chem. Pharm., cxv. 19) , that petroleum contains phenol and its homologues, and as I have found this organic compound in the coniferæ of to-day, it is probable that petroleum in certain areas has been produced from the conifers and the flora generally of some primæval forests. ”

“ Crude petroleum as it comes from the earth is a liquid, formed from the decay of plants and animals long ago buried underground. It is obtained by sinking wells, or pipes, into oil-bearing rock, which is very porous. ”

“ The festive boys who painted the early oil-towns red are getting gray and wrinkled, yet they smile clear down to their boots as they think of Petroleum Centre, Pithole, Babylon, or any other of the rapid places which shed a lurid glare along in the sixties. The smile is not so much on account of flowing wells and six-dollar crude as because of the rollicking scenes which carmined the pioneer-period of Petroleum. ”

“ They have seen the four salt-and-oil wells at Tarentum and the solitary oil-well at Titusville multiplied into a hundred-thousand holes drilled for petroleum and a production almost beyond calculation. Do the gentlemen composing this little group occupy a position dramatic in the marvelous events they review? Is petroleum freighted with interest and a touch of romance at every step of its passage from the well to the lamp? ”

“ Petroleum has long been popularly regarded as a mineral oil. As its derivation indicates, the word means 'rock oil,' an oily substance so named because found naturally oozing from crevices in rocks. Its existence in this country was known from very early times, and when this and other railroad land grants, containing an exception of mineral lands, were made, the extraction of oil from its natural reservoir in subterranean rocks had come to be a promising industry and was extending over an increasing area through discoveries of new oil fields. ”

“ The quantity of oil which a given territory can yield is often very great, since some sand will hold as much as one-eighth of its bulk in oil under pressure. This means that there is 1.5 inches of oil to every vertical foot of oil-sand, or about 5000 cubic feet per acre.
Character and Composition. Petroleum is a liquid of varying color, being black, brown, red, amber, or straw, and by reflected light often appearing greenish in tint. The black oils in the United States are obtained from the Trenton limestone of Ohio and from California; the Pennsylvania oils are of amber tint. ”

“ Astral oil and mineral sperm oil are special illuminating oils of high flashing points. Crude petroleum is much used for fuel purposes in engines. Along the Pacific Coast, especially in southern California, where good coal is scarce, the locomotives consume large quantities of crude oil. Paraffin residue is placed on the market for medicinal purposes under the name of vaseline, petroleum ointment, and cosmoline. ”

“ Petroleum is essentially a volatile oil, and when submitted to distillation yields gases homologous with light carburetted hydrogen of marsh-gas (Ronalds obtained three) , liquids of similar constitution (Pelouze and Cahours isolated twelve) , and solid paraffin-like bodies. Commercially petroleum is distilled so as to yield petroleum-spirit or mineral naphtha used as a substitute for turpentine and for burning in sponge-lamps and costermongers’ barrow-lamps; petroleum oil used all over the world as mineral lamp oil for illuminating purposes; and a heavy oil employed for lubricating machinery. ”

“ The two chief uses of the distillates from crude petroleum are for illumination and lubrication, but the various fractions in many cases have special applications. Rhigolene is used as a local anaesthetic; petroleum ether is employed as a solvent for caoutchouc, fatty oils, and plant principles, and for carbureting air in gas machines; gasoline is employed in the extraction of oil from oil seeds, in carbureting coal gas, in gasoline lamps, stoves, and plumbers' lamps. ”

“ The refining of crude oil as it is produced from the earth, consists in the classification of its various hydrocarbons by means of fractional distillation, into the various products which so largely enter into our commercial and domestic life of to-day. The refined products, in the order in which they are received by distillation, are: motor spirit, illuminating oils, solar oils, lubricating oils, fuel oils, residuum, etc.—the first mentioned being the lightest and the last the heaviest in specific gravity. ”

“ In these fields—whether we look to America or Russia—there has always been considerable waste of crude oil, mostly in regard to furnishing power for oil-field operations, while the natural gases which exude from the wells themselves, and to which reference is made in another chapter, have, in times past, been allowed to pass uncontrolled into the atmosphere. ”

“ Edward Orton, of Ohio, was the most prominent investigator in this field. In all regions where petroleum occurs the strata are not only disturbed, but they are bent into anticlinal or arch-shaped folds. If the rocks are porous the gas tends to collect at the summit of the anticlinal fold or arch, while the oil collects in the flanks of the fold. Salt water is usually associated with the gas and oil, and, being heavier, accumulates in the flanks of the anticlinal or in the neighboring synclinal folds. There is little use of searching for oil in regions where the strata are flat ”

“ When you remember these and many more, and also how the seeds of the club-moss now are largely charged with oil, you will easily imagine that the large masses of coal-plants which have been pressed together and broken and crushed, would give out a great deal of oil which, when made very hot, rises up as gas. You may often yourself see tar oozing out of the lumps of coal in a fire, and making little black bubbles which burst and burn. ”

“ Either petroleum or some of the products of its distillation at a low temperature, as naphtha, rhigolene, gasolene, etc., may be used in the manufacture of gas. These products are of little commercial value as compared with those, like kerosene, which are produced at a higher temperature, but for this reason they are of especial value for the manufacture of gas. The principles on which the manufacture of petroleum-gas depends do not differ much from those involved in the making of coal-gas. ”

“ Most of these characters are common to petroleum from various places. In one important respect, however, the product of your lands differs from that obtained in other situations, that is, it does not, by continued exposure to the air, become hard and resinous like mineral pitch or bitumen. I have been informed by those who have visited the locality, that on the surface of the earth above the springs which furnish your oil there is no crust or deposit of this sort such as have seen in other situations where petroleum or mineral tar is flowing. ”

“ Yet such heating of one’s gas is too tempting an idea to be abandoned, especially in these days of perfected petroleum fuel. With one kilogramme of petroleum I am promised by the manufacturers of my boilers and condensers that I can vaporise twenty kilogrammes of water. If I can devise a practical means for catching this water again as it ceases to be steam, the oft-studied problem will be solved. Imagine the balloon to be coming down—the result of gas condensation. Instead of lightening it by throwing out twenty kilogrammes of sand, I will have but to burn one kilogramme of petroleum! ”

“ Petroleum, as known in Biblical times, and as so widely known to-day, occurs in greater or less quantity throughout the world, and it is found in the whole range of strata of the earth’s crust, from the Laurentian rocks to the most recent members of the Quaternary period, though it is found in commercial quantities almost wholly in the comparatively old Devonian and Carboniferous formations on the one hand or in the various divisions of the comparatively young Tertiary rocks on the other. ”

“ In the latter condition—the hydrocarbons—hydrogen is protected from the all-devourer, oxygen, and enters into innumerable uses. As the inflammable ingredient of wood, of bituminous coal, of petroleum and other vegetable and animal oils, we have it sealed up by Providence, as it were, for a temporary and portable fuel, pending the full development of man's proper authority over the elements—temporary, for it has long been a source of anxiety to economists that the resources of forests and coal-fields are so finite and their prospect of exhaustion so definite. ”

“ The coal measures are due to the storing under water of semi-aquatic plants which have been preserved by being silted up, and we know that coal is full of olefiant gas, marsh-gas, sulphuretted hydrogen and carbon monoxide, which are all combustible, and that the carbonaceous residue, charged with volatile and combustible hydrocarbons, forms the chief fuel of the civilised world. Peat is formed in ways analogous to that of coal, and the so-called mineral oils are certainly the products of organic matter which has been silted up. ”