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26 GAS RESOURCES OF PARTS OF NORTH TEXAS.
remains of plants. The sandstone contains occasional fossil tree
trunks and carbonized wood, which is here and there replaced by
copper minerals, mainly malachite. There appears to be no limestone
near Petrolia, though thin beds of limestone are fairly common in
the higher parts of the Wichita formation exposed at Electra and in
all parts of the formation at places farther south. Gypsum has been
reported in some wells, but, though much gypsum occurs in the
Wichita formation 50 to 100 miles to the west, it is doubtful whether
any occurs in it in the Petrolia field, for no fragments were found in
drill cuttings or slush pits.
The strata penetrated by wells in the Petrolia field, as shown in the
following well logs, include several sands that produce oil or gas
or both. On the whole, the quantity of gas increases with increase in
depth. The sands that lie 150 to 300 feet below the surface contain
very little gas, and probably for this reason the oil wells that derive
oil from these sands have a low daily production and long life.
Practically all the gas marketed comes from a group of sands that lie
at a depth of 1,500 to 1,750 feet. This group is made up of three
principal and two or three subordinate and lenticular sands.
Driller's log of Wichita Gas Co.'s well, on Felix Webb tract, No. 39, Chilson
Neville t Kelley Subdivision, Block No. 13, Clay County, Tex.
[Contractor, M. D. Rowe. Drilled December 29, 1913, to February 5, 1914. Initial production (estimated),
10 million cubic feet of gas. Casing: 10 inch, 54 feet; 6 inch, 1,532 feet set with beveled shoe and
cemented on top of sand. Six-inch Darling gate anchored to 10-inch casing.]
Thick-.Depth.
ness.
Feet. Feet.
Clay..................................................................F131 131
Sand............. ..... ............................................ 6 137
Shale................................................................................... 50 187
Sand showingoil....................................................................... 4 191
Gumbo clay............................................................................. 14 205
Shale and thin sandstone............................................................... 73 278
Sand.................................................................................... 47 325
Shale, soft................................. 27 352
Sand, showing oil....................................................................... 8 360
Shale.................................................................. 25 385
Sand rock............................................................... 35 420
Shale............................................ ............. .............. .11 431
Sand rock..................... .. ......... ....... .................................... 11 442
Blue mud...............................................................................15 457
Sand rock................................. . . . . . . .34 491
Mud........................................................................ 5 496
Shale................ ..------................. . .. 7 503
Gumbo .................................................................15 518
Lime........................................ 6 524
Shale.................................................................................. 10 534
D o1....1.. ............................ .... ....-... ... .. . . 10 544
Gumbo ................................................................. 11 555
Shale................................................................................... 10 565
D o ............................................... .................................. 21 586
Shale and shells........................................................................ 87 673
Sandstone, hard........................................................................ 7 680
M ud.................................................................................... 27 707
Sand rock ............................................................... 8 715
Gum bo................................................................................. 5 720
Sand rock............................................................................... 8 728
Gum bo................................................................................. 17 745
Streaks of sand, showing oil............................................................. 57 802
Mud.................................................................................... 16 818
Gumbo................................................................................ 22 840
Sand rock............................................................................... 21 861