Table 8—Oil and gas well drilling and total crew-weeks spent in geophysical
oil and gas prospecting in 1967 
 
 
Drilling 1 2 
 
Geophysical, 
crew-weeks 
 
 ReflecGravity tion meter seismo 
County  Proved field wells ~________________ 
Exploratory wells 
— 
Total 
——————— 
 
Oil Gas Dry 
Oil Gas Dry 
Wells Footage 
method graph method 
Alameda 6  3Butte  4 1Colusa  1 2Contra Costa__.. 2 5 2Fresno 144  12Glenn
 3 2Humboldt  2Kern 1,537 7 101Kings  7 7Los Angeles 317  18Madera  1Mann
                                     Mendocino                          
        Merced                                      
 1 5 
 1  2 
  4 
  10 
 1 8 
  3 
  
 4 48 
  5 
 6 24 
  
 1 
 2 
 3 
 15 75,987 8 31,541 7 44,635 19 106,776 165 413,787 8 37,406 2 10,555 1,697
3,058,595 19 75,732 365 1,781,236 1 5,700 1 7,800 2 10,199 3 23,064 
 15 
 
9 
 1 22 
 43 
12 
 8 9 5 142 
 46 
 
 5 
 
 1 
 46 
Monterey 55 1 2Orange 161  1 
 14 
 4 
 72 166,083 166 481,109 
 
Sacramento  9 1SanBenito   1San Joaquin  15 6San Luis Obispo~~ 24  2SanMateo
                                  Santa Barbara__ 95  2Santa Clara 1Santa
Cruz                                   Solano  22 5 
 1 
  
 1 17 
 5 
2 
 22 
  
1 
 2 17 
 11 95,853 1 2,108 39 272,179 31 87,260 2 14,130 119 490,930 1 7,407 1 7,700
46 394,907 
1 
 
20 
 13 2 
 
 35 
 85 7 
Sonoma                                      
3 
3 15,336 
 2 
Stanislaus                                    
Sutter 7 2Tehama 2 11 
2 
 2 
 2 
2 18,15011 84,29715 68,665 
 8 
 
9 
Tulare   1Ventura 43  5Yolo  3 3 
 1 
1 - - - - 13 
 3 13 
 2 4,102 62 330,427 22 121,428 
 23 
 15 
6      
Total 2,385 89 190 
 13 7 234 
 2,918 8,345,084 
 
THE MINERAL INDUSTRY OF CALIFORNIA 
1 Does not include 125 service wells (864,930 feet). 
2 Does not include 74 wells (274,469 feet) standing suspended at year end.

Vibro-seismograph method. 
147 
 
of consolidations, with steam injection into 9,955 wells, 837 of which were
drilled expressly for that purpose. Steaming operations was the prime reason
for increased production in the Kern River field where many of the new wells
were drilled. Twenty-two in-situ combustion projects were operated in 13
fields, compared with 20 projects in 18 fields during 1966, seven of which
were included in the steam injection projects. Overall increase in production
resulting from in-situ combustion was only 325 barrels daily. 
 Waterilood projects totaled 198, 30 more than in 1966, and six projects
were abandoned during the year. Included were 1,269 water injection wells
where more than 2 million barrels of water was injected daily. At yearend
nearly 254 million cubic feet of gas was injected daily into 95 wells to
increase oil production at 32 projects. The major projects were at 
large unitized pressure-maintenance operations in Kern County. 
 Over 1 million feet of exploratory drilling for 194 wells seeking new production
resulted in the discovery of five new fields and 11 new reservoirs in older
fields. The new fields were the Livermore, Alameda County; Five Points and
San Emigdio Creek, Kern County; Los Posas, Ventura County; and Crescent Heights,
Los Angeles County. The latter was the most important discovery. Two fields—South
Elwood offshore, Santa Barbara County, and Venice Beach, Los Angeles County—
discovered late in 1966, began producing in 1967. 
 During 1967, refining capacity in California was increased to 1.5 million
barrels daily. Sequoia Refining Co. at Hercules, Contra Costa County, placed
its new refining complex on stream in May with 25,000-barrel-per-day crude
oil capacity.