﻿98 
  SANTA 
  MA 
  IMA 
  OIL 
  DISTRICT, 
  CALIFORNIA. 
  

  

  PINAL-FOLSOM-SANTA 
  MARIA 
  OIL 
  AND 
  GAS-ESCOLLE 
  AREAS. 
  

  

  I.<>< 
  ATluN 
  AM) 
  STKl 
  ( 
  Tl 
  RE. 
  

  

  The 
  area 
  discussed 
  in 
  tins 
  section 
  comprises 
  the 
  Folsom 
  lease, 
  the 
  

   southern 
  part 
  of 
  the 
  Pinal 
  property, 
  the 
  central 
  and 
  southern 
  portion 
  

   of 
  the 
  Santa 
  Maria 
  Oil 
  and 
  Gas 
  lease, 
  and 
  the 
  Escolle 
  property 
  of 
  

   the 
  Union 
  Oil 
  Company. 
  The 
  wells 
  are 
  located 
  on 
  the 
  west 
  end 
  of 
  

   Graciosa 
  Ridge 
  and 
  in 
  the 
  canyons 
  on 
  its 
  sides. 
  The 
  region 
  is 
  largely 
  

   covered 
  by 
  the 
  Fernando 
  sandstone 
  and 
  conglomerate 
  "cap 
  rock," 
  

   although 
  the 
  Monterey 
  shale 
  is 
  exposed 
  in 
  the 
  side 
  canyons. 
  The 
  

   structure 
  underlying 
  this 
  part 
  of 
  the 
  field 
  is 
  comparatively 
  simple 
  

   so 
  far 
  as 
  known, 
  the 
  main 
  Mount 
  Solomon 
  anticline, 
  which 
  plunges 
  

   northwestward 
  through 
  its 
  center, 
  being 
  the 
  only 
  fold 
  of 
  consequence 
  

   immediately 
  affecting 
  the 
  area. 
  The 
  mapping 
  of 
  the 
  anticline 
  near 
  

   Escolle 
  well 
  No. 
  3 
  is 
  based 
  entirely 
  on 
  the 
  evidence 
  offered 
  by 
  the 
  

   well 
  logs, 
  which 
  is 
  at 
  variance 
  with 
  the 
  northwesterly 
  dips 
  in 
  the 
  

   Fernando 
  in 
  the 
  vicinity 
  of 
  Escolle 
  wells 
  Nos. 
  2 
  and 
  3. 
  

  

  GEOLOGY 
  OF 
  THE 
  WELLS. 
  

  

  Those 
  wells 
  which 
  start 
  in 
  the 
  Fernando 
  remain 
  in 
  this 
  formation 
  

   for 
  distances 
  ranging 
  from 
  a 
  few 
  feet 
  to 
  nearly 
  300 
  feet, 
  the 
  strata 
  

   penetrated 
  being 
  sand 
  and 
  conglomerate. 
  In 
  the 
  region 
  of 
  Escolle 
  

   well 
  No. 
  1 
  and 
  Folsom 
  well 
  No. 
  1 
  the 
  Fernando 
  appears 
  to 
  be 
  excep- 
  

   tionally 
  deep, 
  extending 
  nearly 
  300 
  feet 
  below 
  the 
  surface, 
  and 
  to 
  

   consist 
  largely 
  of 
  conglomerate. 
  One 
  of 
  the 
  wells 
  reports 
  red 
  con- 
  

   glomerate 
  at 
  30 
  to 
  90 
  feet 
  below 
  the 
  surface; 
  whether 
  this 
  is 
  burnt 
  

   shale 
  so 
  hardened 
  as 
  to 
  come 
  out 
  of 
  the 
  well 
  in 
  fragments 
  of 
  consid- 
  

   erable 
  size 
  or 
  whether 
  it 
  is 
  true 
  water-worn 
  material 
  is 
  not 
  known. 
  

   Asphaltum 
  is 
  reported 
  at 
  the 
  base 
  of 
  the 
  Fernando 
  in 
  some 
  of 
  the 
  

   wells, 
  and 
  may 
  also 
  be 
  seen 
  at 
  the 
  contact 
  between 
  the 
  Monterey 
  

   shale 
  and 
  overlying 
  beds 
  at 
  many 
  places 
  in 
  this 
  area. 
  (See 
  PI. 
  

   XI, 
  A.) 
  The 
  channels 
  through 
  which 
  this 
  material 
  has 
  escaped 
  

   from 
  the 
  shale 
  are 
  undoubtedly 
  joint 
  cracks, 
  as 
  veins 
  of 
  the 
  hardened 
  

   asphaltum 
  may 
  be 
  seen 
  in 
  the 
  shale 
  beside 
  the 
  road 
  leading 
  up 
  to 
  

   Santa 
  Maria 
  Oil 
  and 
  Gas 
  (Squires) 
  well 
  No. 
  4 
  and 
  at 
  other 
  points 
  in 
  

   the 
  field. 
  From 
  the 
  base 
  of 
  the 
  Fernando 
  to 
  the 
  bottom 
  of 
  the 
  wells 
  

   the 
  strata 
  penetrated 
  are 
  practically 
  all 
  shale 
  with 
  a 
  few 
  hard 
  "shell" 
  

   layers, 
  under 
  which 
  occur 
  accumulations 
  of 
  gas 
  and 
  locally 
  of 
  oil. 
  

  

  A 
  zone 
  in 
  which 
  "shells" 
  appear 
  to 
  be 
  particularly 
  abundant 
  

   immediately 
  overlies 
  the 
  first 
  oil 
  zone. 
  Traces 
  of 
  tar 
  and 
  asphaltum 
  

   are 
  also 
  reported 
  in 
  the 
  shale 
  at 
  various 
  depths. 
  Two 
  zones 
  in 
  

   which 
  many 
  hard 
  limestone 
  "shells 
  5 
  ' 
  layers 
  are 
  encountered 
  are 
  

   reported 
  from 
  some 
  of 
  the 
  wells; 
  one 
  of 
  these 
  is 
  about 
  500 
  feet 
  above 
  

   the 
  second 
  oil 
  zone 
  (B), 
  and 
  the 
  other 
  immediately 
  underlies 
  it. 
  

  

  