Oil and Gas Yielding Formations of California

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A.J. Johnston, superintendent State printing, 1900 - Natural gas - 236 pages
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Page 120 - ... periods to which they respectively belong can only be inferred from the few poorly preserved fossils obtained in this locality, and from the physical resemblance of the rocks themselves to the rocks of other formations on the eastern slope of the Coast Ranges, which are richer in palseontological evidence. The oldest rocks exposed in the Sunset oil-district consist of sandstone, calcareo-silicious rocks and impure limestone, dark-colored shales, massive light-colored shales showing a hackly fracture,...
Page 120 - The rocky formations which impinge on the southern portion of the Sunset oil-district constitute the mountainous ridges previously mentioned on the northeastern slope of the Tehachapai range. These ridges are, for the most part, formed by faults and minor folds in the stratified rocks supplemented by erosion. The strike of this formation, in a general way, is northwesterly. No fossils were found in this formation, but its lithological character resembles that of the San Emidio Canon, where a small...
Page 184 - ... readily through sandstone. The upward course of the petroleum might be impeded by strata of shale, and, when the temperature decreased, the petroleum might condense in any rocks sufficiently porous to afford it storage. If the shale were only partially impervious to the petroleum the former would be, more or less, permeated by the latter, and fractures In the shale would give the petroleum access to overlying formations. A modification of such processes, by gas or hydrostatic pressure, would...
Page 205 - ... to a similar geological horizon. TABLE No. 3. A scrutiny of these tables indicates that on the ground of physical composition alone there is a wide range in the products that can be manufactured from California petroleum. With the exception of a sample of oil from the Cretaceous formations of Colusa County, all the samples of oil which have been examined by the writer showed an asphaltic base; ie, the residuum, after the distillation of the lighter hydrocarbons, was an asphalt, or a heavy tar...
Page 182 - ... In the foothills of the Coast Ranges west of Bakersfield in Kern County petroleum is found in formations ranging from the Eocene to the Middle Neocene. In these oil-fields the most productive formations are in the lower portion of the Middle Neocene series, and valuable quantities of heavy oil are found in, the upper portion of the Lower Neocene. At McKittrick the oil-bearing strata are of Middle Neocene age ; at the Avenal and Kreyenhagen districts the oil-yielding strata are of Lower Neocene...
Page 176 - The drab-colored sandstone rests on a brown sandstone, locally known as the Sespe brownstone. 12.1.11. In the Devil's Gate mining district the brownstone rests on whitish sandstone, and the latter on a buff-colored sandstone. The Sespe brownstone, the white sandstone, and the buff-colored sandstone all contain typical Eocene fossils, f All these sandstones are more or less interbedded with shale. The principal oil-yielding formations in the Sespe district are the lowermost portions of the drab-colored...
Page 130 - The asphaltum was found to be interbedded with thin strata of light-colored clay, sand, and pebbles. One of the uppermost strata, which is composed of dark-colored sand, is fossiliferous and contains fresh-water shells. These strata dip N. 80° E. at an angle of about 50°. In 1894 the writer submitted specimens of these fresh-water shells to Dr. JG Cooper, who found them to be living forms. (See Bulletin No. 3, p. 49.) These asphaltum mines were successfully worked for several years.
Page 206 - ... 35° B. 2.9% 33° B. 10.2% 61° B. 13.5% 55° B. 12.2% 43° B. 10.2% 36° B. 8.3% 34° B. 9.3% 54° B. 13.4% 48° B. 13.9% 41° B. 8.3% 35° B. 19.5% 54° B. 17.2% 46" B. 11.8% 37° B. 6.0% 33° B. 24.4% 57° B. 17.1% 47° B. 14.8% 39° B. 3.6% 34° B. 300° C 350° C. CALIFORNIA STATE MINING BUREAU. Sample B, from Colusa County. This sample contained bs (sludge). By Volume. Crude oil Distillate below 280° C Traces Distillate below 300° C -16.250% Distillate below 350° C - 3.122% At a somewhat...
Page 185 - There are two phases of geological research upon which a right understanding of our petroleum deposits depend s : ( 1 ) An investigation as to the area over which the petroleum-yielding formations extend ; and (2) an investigation as to the probable course, length, and width of the oil-lines, or the lines along which remunerative wells can be obtained. With a good topographical map, the former can be successfully carried on without the expenditure of much time and labor; the latter, upon which alone...
Page 120 - Miocene fossils, also from thick sandstone strata. As previously mentioned, the Miocene and Pliocene formations are grouped under the head of Neocene. 7.4.8. The rocky formations of the Sunset oil-district will now be enumerated in what appears to be the order of their relative stratigraphical superposition. (See Fig. 12.) The geological periods to which they respectively belong can only be inferred from the few poorly preserved fossils obtained in this locality, and from the physical resemblance...

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