﻿DETAILS 
  OF 
  THE 
  DEVELOPED 
  TERRITORY. 
  93 
  

  

  the 
  latter 
  was 
  followed. 
  In 
  the 
  Fernando 
  formation, 
  which 
  uncon- 
  

   formable 
  overlies 
  the 
  Monterey 
  shale, 
  it 
  was 
  natural 
  to 
  expect 
  vari- 
  

   ance 
  with 
  the 
  structure 
  in 
  the 
  Monterey, 
  but 
  even 
  here 
  the 
  surface 
  

   evidence 
  more 
  often 
  supported 
  than 
  contradicted 
  the 
  evidence 
  

   obtained 
  by 
  the 
  drill. 
  

  

  DIFFICULTIES 
  OF 
  PREPARATION. 
  

  

  After 
  carefully 
  plotting 
  all 
  the 
  logs 
  on 
  a 
  uniform 
  scale 
  it 
  was 
  found 
  

   that 
  the 
  greatest 
  obstacle 
  to 
  overcome 
  in 
  the 
  preparation 
  of 
  the 
  con- 
  

   tour 
  map 
  was 
  the 
  correlation 
  of 
  strata 
  from 
  one 
  well 
  to 
  another 
  and 
  

   from 
  one 
  part 
  of 
  the 
  field 
  to 
  another. 
  The 
  difficulties 
  of 
  such 
  corre- 
  

   lations 
  are 
  doubtless 
  familiar 
  to 
  anyone 
  who 
  has 
  tried 
  to 
  work 
  out 
  

   the 
  underground 
  structure 
  of 
  any 
  of 
  the 
  California 
  fields: 
  The 
  Santa 
  

   Maria 
  field 
  offers 
  as 
  much 
  encouragement 
  to 
  successful 
  study 
  and 
  

   mapping 
  of 
  the 
  underlying 
  oil-bearing 
  formations 
  as 
  any 
  other 
  so 
  far 
  

   examined 
  by 
  the 
  senior 
  author, 
  and 
  so 
  the 
  effort 
  has 
  been 
  made 
  to 
  

   delineate 
  on 
  the 
  map 
  all 
  the 
  details 
  of 
  structure 
  furnished 
  by 
  the 
  

   data 
  available, 
  and 
  to 
  supplement 
  these 
  details 
  by 
  showing 
  for 
  the 
  

   untested 
  areas 
  what 
  seem 
  to 
  be 
  the 
  most 
  likely 
  conditions 
  of 
  under- 
  

   ground 
  structure. 
  It 
  is 
  very 
  easy 
  to 
  make 
  an 
  ambiguous 
  statement 
  

   which 
  will 
  apply 
  equally 
  well 
  to 
  any 
  conditions 
  exposed 
  by 
  future 
  

   development, 
  no 
  matter 
  what 
  they 
  may 
  be; 
  but 
  it 
  is 
  impossible 
  to 
  

   make 
  an 
  ambiguous 
  map. 
  However, 
  it 
  is 
  deemed 
  advisable 
  to 
  show 
  

   the 
  information 
  in 
  hand, 
  incomplete 
  as 
  it 
  is, 
  on 
  a 
  map. 
  Future 
  

   development 
  will 
  doubtless 
  add 
  much 
  to 
  our 
  knowledge 
  of 
  this 
  field, 
  

   and 
  will 
  show 
  the 
  inaccuracies 
  of 
  the 
  contouring 
  as 
  here 
  presented, 
  

   but 
  it 
  is 
  hoped 
  that 
  the 
  benefits 
  which 
  may 
  accrue 
  to 
  the 
  operators 
  

   from 
  a 
  knowledge 
  of 
  the 
  general 
  structure 
  of 
  the 
  field 
  will 
  compen- 
  

   sate 
  in 
  a 
  measure 
  for 
  the 
  errors 
  in 
  detail 
  which 
  are 
  to 
  be 
  expected 
  in 
  

   a 
  map 
  based 
  on 
  data 
  so 
  incomplete. 
  

  

  THE 
  WELLS. 
  

   AREAS 
  DISCUSSED. 
  

  

  For 
  convenience 
  of 
  discussion 
  the 
  proved 
  portion 
  of 
  the 
  Santa 
  

   Maria 
  field 
  has 
  been 
  roughly 
  divided 
  into 
  six 
  areas, 
  based 
  largely 
  

   on 
  the 
  geographic 
  position 
  of 
  the 
  wells. 
  The 
  following 
  are 
  the 
  areas 
  

   discussed: 
  Hall-Hobbs-Rice 
  ranch; 
  Pinal-Fox-Hobbs 
  ; 
  Pinal-Fol- 
  

   som-Santa 
  Maria 
  Oil 
  and 
  Gas-Escolle; 
  Hartnell-Brookshire 
  ; 
  Gra- 
  

   ciosa- 
  Western 
  Union; 
  and 
  eastern 
  Western 
  Union. 
  

  

  OIL 
  ZONES. 
  

  

  Although 
  in 
  many 
  instances 
  detailed 
  correlation 
  from 
  one 
  well 
  

  

  to 
  another 
  is 
  impossible, 
  four 
  fairly 
  well 
  defined 
  oil 
  zones 
  are 
  believed 
  

  

  to 
  be 
  recognizable 
  in 
  the 
  Santa 
  Maria 
  field. 
  Of 
  these 
  at 
  least 
  two 
  

  

  are 
  found 
  in 
  practically 
  every 
  part 
  of 
  the 
  field, 
  although 
  all 
  vary 
  

  

  1784— 
  Bull. 
  322—07 
  7 
  

  

  