Series 6; Geologic Reports Volume 2

Series 6; Geologic Reports Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: shale free petroleums could only be brought about through a conception of the black shale as an essentially dry rock strata. It cannot be shown that the Chattanooga black shale with its charge of connate water was ever any drier, if as dry, as it is at present. The amount of moisture which it must always have contained could then have only acted to retard any capillary attraction of the more porous limestone or sandstone beneath it. Underlying the Devonian limestone is found the Niagaran (Silurian) limestone which produces oil in Lee county, and in Allen and Warren county from sandy, porous streaks. The oil produced shows a Baume gravity of 32.75, and a gasoline fraction which will vary from 9.3 to as high as 18.5. The color is green and the oil is rather high in sulphur in the Allen county field, though not noticeably so in other fields. These "pay" horizons in the Niagaran limestone are surrounded by thin green to gray calcareous shales, which though low in bituminous matter, must have served in part as the mother-rock. In the case of the Silurian limestone, however, as in the overlying Devonian limestone, a careful examination of all tho evidence at hand points to a gradual petroliferous enrichment along vertical or semi-vertical porous channels or planes from original sources well down in the underlying Ordovician section. The series of productive horizons which orcw in the Ordovician directly inferior to the above discussed Niaganm limestones is not well defined in Kentucky, and consists principally of porous lenses or "strays" in the limestone proper. It is impossible to correlate these productive horizon over detached areas into any definite sand or groups of sands, but they have generally received more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • United States
  • English
  • black & white illustrations
  • 1236765877
  • 9781236765871