﻿DETAILS 
  OF 
  THE 
  DEVELOPED 
  TERRITORY. 
  97 
  

  

  little 
  consequence 
  as 
  regards 
  production. 
  The 
  thickness 
  of 
  zone 
  A 
  

   in 
  the 
  wells 
  ranges 
  from 
  8 
  or 
  10 
  to 
  nearly 
  150 
  feet, 
  but 
  several 
  more 
  

   or 
  less 
  important 
  oil-bearing 
  zones 
  lie 
  between 
  this 
  and 
  the 
  next 
  

   lower 
  (B) 
  zone. 
  The 
  productive 
  measures 
  of 
  zone 
  A 
  consist 
  largely 
  

   of 
  brown 
  shale, 
  probably 
  seamed 
  or 
  jointed 
  in 
  such 
  a 
  way 
  as 
  to 
  afford 
  

   a 
  reservoir 
  for 
  the 
  oil, 
  although 
  certain 
  of 
  the 
  wells 
  may 
  obtain 
  their 
  

   product 
  from 
  fine-grained 
  sands 
  interstratified 
  with 
  the 
  shale. 
  

  

  The 
  second 
  oil 
  zone 
  (B) 
  is 
  the 
  most 
  important 
  one 
  in 
  this 
  area, 
  

   although 
  it 
  is 
  underlain 
  over 
  at 
  least 
  a 
  part 
  of 
  the 
  area 
  by 
  zone 
  C, 
  which 
  

   is 
  apparent 
  ly 
  even 
  more 
  productive. 
  The 
  thickness 
  of 
  zone 
  B 
  is 
  

   variable, 
  but 
  most 
  of 
  the 
  wells 
  penetrate 
  from 
  50 
  to 
  150 
  feet 
  of 
  pro- 
  

   ductive 
  strata 
  at 
  this 
  horizon. 
  The 
  oil-bearing 
  beds 
  are 
  similar 
  to 
  

   those 
  of 
  zone 
  A 
  and 
  appear 
  to 
  consist 
  largely 
  of 
  hard 
  shales, 
  with 
  

   some 
  fine 
  sands, 
  although 
  some 
  excellent 
  examples 
  of 
  a 
  true 
  siliceous 
  

   sand 
  are 
  obtained 
  in 
  many 
  of 
  the 
  wells. 
  A 
  hard 
  limestone 
  " 
  shell" 
  

   overlies 
  zone 
  B 
  in 
  one 
  well. 
  

  

  The 
  third 
  oil 
  zone 
  (C) 
  is 
  penetrated 
  by 
  some 
  of 
  the 
  deeper 
  wells 
  

   at 
  a 
  depth 
  of 
  about 
  300 
  to 
  400 
  feet 
  below 
  zone 
  B. 
  In 
  one 
  of 
  the 
  

   wells 
  zone 
  C 
  appears 
  to 
  be 
  missing, 
  although 
  a 
  good 
  flow 
  of 
  oil 
  is 
  

   reported 
  from 
  the 
  same 
  hole 
  about 
  500 
  feet 
  below 
  where 
  it 
  should 
  

   occur. 
  

  

  Water 
  underlies 
  oil-zone 
  B 
  in 
  one 
  of 
  the 
  wells 
  and 
  zone 
  C 
  in 
  another. 
  

   This 
  occurrence 
  of 
  water 
  below 
  the 
  oil, 
  so 
  common 
  in 
  most 
  fields, 
  

   is 
  very 
  rare 
  in 
  this 
  one. 
  Whether 
  or 
  not 
  in 
  the 
  course 
  of 
  time 
  water 
  

   will 
  follow 
  up 
  the 
  oil 
  in 
  the 
  productive 
  zones 
  is 
  something 
  that 
  will 
  

   be 
  awaited 
  with 
  a 
  great 
  deal 
  of 
  interest. 
  Some 
  of 
  the 
  wells 
  in 
  the 
  

   Santa 
  Maria 
  field 
  have 
  been 
  stopped 
  in 
  the 
  midst 
  of 
  productive 
  strata 
  

   for 
  fear 
  of 
  encountering 
  water 
  farther 
  down, 
  but 
  whether 
  or 
  not 
  

   these 
  fears 
  were 
  well 
  founded 
  has 
  never 
  been 
  established. 
  

  

  PRODUCT. 
  

  

  The 
  oil 
  from 
  this 
  group 
  of 
  wells 
  is 
  of 
  a 
  dark-brown 
  color 
  and 
  

   ranges 
  in 
  gravity 
  from 
  24° 
  to 
  28° 
  Baume, 
  the 
  lighter 
  oil 
  usually 
  occur- 
  

   ring 
  in 
  the 
  wells 
  nearest 
  the 
  main 
  anticline; 
  the 
  average 
  gravity 
  is 
  

   between 
  25° 
  and 
  26°. 
  Much 
  gas 
  is 
  associated 
  with 
  the 
  oil 
  in 
  all 
  the 
  

   wells. 
  

  

  The 
  production 
  of 
  the 
  individual 
  wells 
  ranges 
  from 
  60 
  to 
  1,000 
  

   barrels 
  per 
  day, 
  the 
  latter 
  amount 
  coming 
  from 
  a 
  hole 
  very 
  eccentric 
  

   in 
  its 
  behavior, 
  as 
  shown 
  by 
  its 
  yield 
  of- 
  200 
  barrels 
  on 
  some 
  days 
  

   and 
  as 
  high 
  as 
  1,000 
  on 
  others; 
  the 
  average 
  daily 
  production 
  for 
  this 
  

   well 
  is 
  300 
  barrels. 
  With 
  the 
  eccentric 
  well 
  omitted, 
  the 
  maximum 
  

   production 
  is 
  about 
  500 
  barrels 
  per 
  day. 
  One 
  well 
  which 
  produced 
  

   150 
  barrels 
  from 
  zones 
  A 
  and 
  B 
  added 
  350 
  barrels 
  to 
  its 
  output 
  when 
  

   deepened 
  to 
  zone 
  C. 
  

  

  