File:Third annual report of the State Oil and Gas Supervisor of California for the fiscal year 1917-1918 - covering operations of the Department of Petroleum and Gas of the State Mining Bureau (1918) (14777567465).jpg

Identifier: thirdannualrepor00mclarich (find matches)
Title: Third annual report of the State Oil and Gas Supervisor of California for the fiscal year 1917-1918 : covering operations of the Department of Petroleum and Gas of the State Mining Bureau
Year: 1918 (1910s)
Authors: McLaughlin, R. P. (Roy Parmelee), b. 1879 Hamilton, Fletcher, b. 1882 California. Division of Oil and Gas California State Mining Bureau
Subjects: Petroleum industry and trade Natural gas Geothermal resources
Publisher: Sacramento : California State Printing Office
Contributing Library: University of California Libraries
Digitizing Sponsor: Kahle/Austin Foundation and Omidyar Network

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de for the entire group, irrespectiveof their location. On the accompanying cross-section stratigraphic datum is drawnthrough zero depth, that is derrick floor at Well No. 6, so that all cor-rections for differences from surface to stratigraphic datum in each ofthe wells will be plus. In this position also the drilling records withrespect to the principal upper water strata and other formations ofimportance can be plotted. . The data on the Progress Chart are shown with respect to time anddepth. A convenient vertical scale is 100 feet to 1 inch. The depthsdrilled per day here shown would be unusual for anything but illus-tration. Progress in drilling is plotted from the daily tour records. Itis not necessary, for plotting, to figure corrections between depths belowsurface and depths below stratigraphic datum. A graphic scale may ■W .ApMirfMI^MpMM A ■AflTP PROGRESS CHART of WELLS during DRILLING CompariTig Geologic Depths atWious Dates BYR-E-COLLOM ,N°7 N?8 WATtR ZONE. E. OIL ZONE
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Accompanying Bulletin No 84, Co/iforn/o Sfafe Anint/j^ Bureau. THIRD ANNUAL REPORT. 197 /nerely be placed in such a position on the chart as to automaticallycorrect for the distance of the derrick floor above or below the strati-graphic datum line. At the left end of the progress chart is a composite graphic log offormations between stratigraphic datum and the bottom of the strati-graphicall) deepest well in the group. All lines of correlation are horizontal on the Progress Chart. Drillingoperations in any well, plotted as the work progresses can be referredaero.s,s the chart to the composite log for a check on the formationalprogress of the work. As formations logged in certain wells may not be logged, althoughpresent, in a well being drilled, the combination of conditions, such aswater sands, caves, shells, etc., for all wells of a group, in a compositelog is a useful guide, although it should not displace the ordinary cross-section for accurate work. In preparing cross-sections, wh

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