. Cassier's magazine . ). FIG. 1. SECTION SHOWING OIL ACCUMULATED IN ROCK WAVES The height at which the oil will be in the wave depends on the water beneath the gas and oil; well B struck oil; well C yielded only water. Wells A, A gas to take place, the overlying rocksmust contain such minute pore spacesthat the gas, oil and water cannotpass through it. Next below the gaswill come the oil, and below that thewater which fills the rocks. Thusthe oil will occur near the crest(anticline) of the rock wave, in thetrough (syncline), or at some inter-mediate point, depending on theh
. Cassier's magazine . ). FIG. 1. SECTION SHOWING OIL ACCUMULATED IN ROCK WAVES The height at which the oil will be in the wave depends on the water beneath the gas and oil; well B struck oil; well C yielded only water. Wells A, A gas to take place, the overlying rocksmust contain such minute pore spacesthat the gas, oil and water cannotpass through it. Next below the gaswill come the oil, and below that thewater which fills the rocks. Thusthe oil will occur near the crest(anticline) of the rock wave, in thetrough (syncline), or at some inter-mediate point, depending on theheight of the water filling the , before drilling a wellin a region where the strata arefolded, the exact structure of therock and the depth of the groundwater beneath the surface should beascertained, so as to know whetherto drill near the top of the wave, inthe trough, or at some place is acting on the supposition thatthe porous rock is continuous overthe entire rock wave. If the porousrock is only
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