. Bulletin. ce for eachwell should be recorded near the respective well locations upon a con-vergence map made on transparent tracing paper or cloth. Thismap should have the same scale as the surface contour map andshould show the Avell locations and their number. In many places the distances between the oil sand and the keybed increase or decrease in a certain direction. This variation inthickness is indicated by means of isochor (lines of equal inter- 22 After M. J. Munn, Sewicklev Folio (Folio 176), field ed. : U. S. Geol. Survey. 1911,p. 56. A convergence map is usually prepared on tracing
. Bulletin. ce for eachwell should be recorded near the respective well locations upon a con-vergence map made on transparent tracing paper or cloth. Thismap should have the same scale as the surface contour map andshould show the Avell locations and their number. In many places the distances between the oil sand and the keybed increase or decrease in a certain direction. This variation inthickness is indicated by means of isochor (lines of equal inter- 22 After M. J. Munn, Sewicklev Folio (Folio 176), field ed. : U. S. Geol. Survey. 1911,p. 56. A convergence map is usually prepared on tracing: paper or tracing- cloth, and ismade the same size as the structure contour map. See Griswold. W. and Munn. M. . GeoloiST of oil and gas fields in Steulienville,Burgettstown, and Claysville Quadrangles. Ohio, West Virginia and Pennsylvania : , U. S. Geological Survey, pp. : Johnson. R. and Huntley, L. G.,Principles of oil and gas production : First edition, 1916, pp. LEGEND PLEISTOCENE Glacial Drift .;p--:^ PENNSYLVANIANCoal Measures La Salle No. 2 DEVONIANLimestone H- SILURIAN Niagara Limestone xn: ORDOVICIAN Maquoketa ShalefEIE-^Trenton - Galena LimestoneSt Peter Sandstone III iS^ Lower Magnesian -^r^^ BULLETIN IM PLATe
Size: 920px × 2717px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
