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  SANTA 
  MARIA 
  OIL 
  DISTRICT, 
  CALIFORNIA. 
  

  

  blue 
  and 
  brown 
  shales, 
  largely 
  the 
  latter, 
  interstratified 
  with 
  hard 
  

   "shell" 
  layers, 
  under 
  some 
  of 
  which 
  are 
  accumulations 
  of 
  gas. 
  

  

  The 
  first 
  oil 
  zone 
  is 
  struck 
  at 
  a 
  depth 
  of 
  1,200 
  to 
  1,800 
  feet, 
  and 
  

   ranges 
  in 
  thickness 
  from 
  12 
  to 
  75 
  feet, 
  although 
  in 
  some 
  of 
  the 
  wells 
  

   sands 
  are 
  encountered 
  at 
  intervals 
  for 
  at 
  least 
  250 
  feet 
  below 
  the 
  top 
  

   of 
  the 
  first 
  sand. 
  The 
  oil 
  sand 
  is 
  as 
  a 
  rule 
  rather 
  fine 
  "rained 
  and 
  is 
  

   accompanied 
  both 
  above 
  and 
  below 
  by 
  shale 
  and 
  rarely 
  by 
  shell. 
  In 
  

   some 
  of 
  the 
  wells 
  the 
  oil 
  zone 
  appears 
  to 
  be 
  practically 
  continuous 
  

   sand 
  for 
  its 
  entire 
  thickness; 
  in 
  others, 
  alternating 
  sand 
  and 
  shale 
  

   layers 
  furnish 
  the 
  oil. 
  

  

  A 
  second 
  oil 
  zone 
  occurs 
  about 
  1,200 
  feet 
  below 
  the 
  first, 
  the 
  entire 
  

   distance 
  4 
  between 
  the 
  two 
  being 
  occupied 
  by 
  shale, 
  with 
  a 
  few 
  hard 
  

   "shell" 
  layers. 
  Very 
  little 
  oil 
  occurs 
  at 
  this 
  horizon. 
  

  

  A 
  third 
  oil 
  zone 
  about 
  150 
  feet 
  thick 
  is 
  penetrated 
  2,100 
  feet 
  below 
  

   the 
  first, 
  the 
  formation 
  between 
  the 
  second 
  and 
  third 
  zones 
  being 
  prac- 
  

   tically 
  all 
  shale. 
  Comparatively 
  little 
  oil 
  was 
  obtained 
  from 
  this 
  zone 
  

   in 
  this 
  part 
  of 
  the 
  field, 
  although 
  it 
  is 
  thought 
  to 
  be 
  the 
  same 
  as 
  the 
  

   one 
  which 
  is 
  so 
  productive 
  in 
  the 
  Graciosa 
  Western 
  Union 
  area 
  only 
  

   half 
  a 
  mile 
  to 
  the 
  west. 
  This 
  may 
  be 
  accounted 
  for 
  by 
  the 
  general 
  

   synclinal 
  position 
  of 
  the 
  eastern 
  group 
  between 
  the 
  Mount 
  Solomon 
  

   and 
  hypothetical 
  Newlove 
  anticlines. 
  

  

  PRODUCT. 
  

  

  The 
  oil 
  in 
  the 
  first 
  productive 
  zone 
  has 
  an 
  average 
  gravity 
  of 
  about 
  

   19° 
  Baume 
  and 
  is 
  very 
  dark 
  colored. 
  Gas 
  is 
  associated 
  with 
  the 
  oil, 
  

   but 
  no 
  water 
  has 
  so 
  far 
  been 
  reported 
  from 
  any 
  of 
  the 
  w 
  T 
  ells. 
  

  

  The 
  production 
  of 
  the 
  wells 
  in 
  this 
  group 
  ranges 
  from 
  5 
  to 
  154 
  bar- 
  

   rels 
  per 
  day. 
  The 
  yield 
  of 
  some 
  of 
  the 
  wells 
  is 
  fairly 
  constant, 
  show- 
  

   ing 
  only 
  a 
  small 
  decrease 
  in 
  average 
  daily 
  output 
  over 
  a 
  considerable 
  

   number 
  of 
  months; 
  in 
  others, 
  however, 
  the 
  yield 
  is 
  fluctuating. 
  

  

  LOMPOC 
  FIELD. 
  

   LOCATION. 
  

  

  The 
  developed 
  territory 
  within 
  the 
  Lompoc 
  field, 
  on 
  which 
  the 
  fol- 
  

   lowing 
  discussion 
  is 
  based, 
  lies 
  on 
  the 
  flanks 
  of 
  the 
  Purisima 
  Hills 
  be- 
  

   tween 
  the 
  Cebada 
  Canyon 
  and 
  Santa 
  Lucia 
  Canyon 
  roads. 
  Within 
  it 
  

   are 
  located 
  the 
  Logan 
  well 
  of 
  the 
  Los 
  Alamos 
  Oil 
  and 
  Development 
  

   Company; 
  the 
  Hill, 
  Wise 
  & 
  Denigan, 
  and 
  Eefson 
  wells 
  of 
  the 
  Union 
  

   Oil 
  Company; 
  and 
  the 
  abandoned 
  wells 
  of 
  the 
  Todos 
  Santos, 
  Coast 
  

   Line, 
  and 
  Barca 
  oil 
  companies. 
  

  

  STRUCTURE. 
  

  

  The 
  dominant 
  structural 
  feature 
  of 
  the 
  field 
  is 
  the 
  main 
  anticline 
  

   of 
  the 
  Purisima 
  Hills. 
  From 
  surface 
  evidence 
  the 
  location 
  of 
  the 
  

  

  