All oil and gas wells commenced or drilled within the city limits after the effective date of Charter Ordinance No. 2, shall be drilled as nearly as practicable in the center of a not less than ten-acre square geographical location nor more than the spacing pattern as specified by the State Corporation Commission; provided, however, that the governing body of the city at the time of the granting of the license hereinafter provided for may permit such variations as may be deemed necessary in the amount of acreage required and the location of the drill site depending on geographical factors, upon the location of houses and other buildings, and the area available which might be attributed to such proposed well. (Charter Ord. 2, passed - -)