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ATIKAH NURINA SARI

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Abstrak (Bhs. Indonesia)

Eksplorasi  dan  eksploitasi  di  Indonesia  saat  ini  masih  terfokus  pada  energi konvensional  hidrokarbon  dibandingkan  energi  nonkonvensional  hidrokarbon  seperti gas  serpih.  Dalam  proses  eksplorasi,  dibutuhkan  analisis  geokimia  batuan  induk  yang meliputi  kuantitas  atau  jumlah  material  organik,  kualitas  atau  tipe  material  organik, dan  kematangan  termal  sebagai  salah  satu  faktor  penting  dalam  mengkarakterisasi batuan  induk.  Daerah  penelitian  terletak  di  Cekungan  Sumatra  Utara,  Provinsi  Sumatra Utara.  Penelitian  dilakukan  terhadap  5  sumur  yaitu  Sumur  ANS-1,  Sumur  DBNA-1, Sumur  MRA-1,  Sumur  DAS-1,  dan  Sumur  USS-1.  Metode  yang  digunakan  dalam penelitian  ini  yaitu  analisis  geokimia  hidrokarbon  pada  batuan  induk  yang  meliputi analisis  TOC  (Total  Organic Carbon),  tipe  kerogen,  vitrinite  reflectance,  dan  Potential Yields.  Selain  itu  untuk  mengetahui  waktu  kematangan  dari  batuan  induk  maka dilakukan  pemodelan  sejarah  kematangan  batuan  induk  dengan  membuat  sejarah pemendaman.  Sejarah  pemendaman  dibuat  dengan  2  cara  yaitu  secara  manual  dan menggunakan  software  Petromod.  Berdasarkan  hasil  analisis,  Formasi  Baong  Bawah dan  Formasi  Belumai  pada  Sumur  ANS-1  berpotensi  sebagai  batuan  induk  dengan nilai  TOC  antara  cukup-baik  termasuk  tipe  II  dan  III,  tingkat  kematangan  immaturedry  gas,  dan  potential  yields  berkisar  antara  buruk-cukup.  Batuan  induk  pada  Sumur DBNA-1 memiliki kandungan  TOC antara  cukup-baik  termasuk  tipe  II  dan  III,  tingkat kematangan  immature-dry  gas,  dan  potential  yields  antara  buruk-cukup.  Batuan  induk Sumur  MRA-1  memiliki  kandungan  TOC  antara  cukup-baik,  termasuk tipe  II  dan  III, tingkat  kematangan  peak  oil-late  oil,  potential  yields  buruk-cukup.  Batuan  induk Sumur  DAS-1  memiliki  kandungan  TOC  antara  cukup-baik  termasuk  tipe  II  dan  III, tingkat  kematangan  immature,  potential  yields  buruk-cukup.  Batuan  induk  Sumur USS-1  memiliki  kandungan  TOC  antara  cukup-baik  termasuk  tipe  II  dan  III,  tingkat kematangan  immature-peak  oil,  potential  yields  buruk-cukup.  Waktu  kematangan batuan  induk  pada  Sumur  ANS-1  yaitu  diperkirakan  sekitar  9  Ma  secara  manual  dan 14  Ma  dengan  software.  Sumur  DBNA-1  matang  pada  recent  secara  manual  dan  14 Ma  dengan  software,  Sumur  MRA-1  matang  pada  recent  secara  manual  dan  5  Ma dengan  software,  Sumur  DAS-1  matang  pada  recent  secara  manual  dan  5  Ma  dengan software,  sedangkan  Sumur  USS-1  matang  pada  recent  secara  manual  dan  2  Ma dengan  software.  Terdapat  perbedaan  dari  kedua  hasil  waktu  kematangan  yaitu  secara manual  lebih  lambat  dibandingkan  software  karena  tidak  ada  perhitungan  faktor litologi, heat flow, dan tipe  kerogen.

Abtrak (Bhs. Inggris)

Exploration  and  exploitation  in  Indonesia  is  currently  still  focused  on conventional  hydrocarbon  compared  to  nonconventional  hydrocarbons  such  as  shale gas.  In  the  exploration  process,  geochemical  analysis  of  source  rock  is  needed  which includes  the  quantity  or  amount  of  organic  material,  quality  or  type  of  organic  material, and  thermal  maturity  as  one  of  the  important  factors  in  characterizing  source  rock.  The research  area  is  located  in  North  Sumatra  Basin,  North  Sumatra  Province.  Research carried  out  on  5  wells,  there  are  ANS-1  well,  DBNA-1  well,  MRA-1  well,  DAS-1  well, and  USS-1  well.  The  methods  that  is  used  in  this  research  is  hydrocarbon  geochemistry analysis  of  source  rock:  TOC  (Total  Organic  Carbon)  analysis,  Kerogen  type,  Vitrinite Reflectance,  and  Potential  Yields.  In  addition  to  knowing  the  time  of  maturity  of  the source  rock,  it  used  maturity  history  modelling  by  making  burial  history.  The  burial history  is  made  by  two  ways:  manually,  and  using  Petromod  software.  Based  on  the result  of  analysis,  Belumai  and Lower  Baong  Formation  at  ANS-1  well  have  potential as  source  rock  with  TOC  values  between  fair-good  included  type  II  and  type  III, immature-dry  gas  level  of  oil,  and  potential  yields  ranged  from  poor-fair.  The  source rock  of  DBNA-1  well  have  TOC  contents  between  fair-good  included  type  II  and  type III,  maturity  level  is  immature-dry  gas  window,  and  potential  yields  is  poor-fair.  The source  rock  of  MRA-1  well  have  TOC  contents  between  fair-good  included  type  II and  type  III,  maturity  level  is  peak  oil-late  oil  window,  and  potential  yields  is  poorfair.  The  source  rock  of  DAS-1  well  have  TOC  contents  between  fair-good  included type  II  and  type  III,  maturity  level  is  immature  window,  and  potential  yields  is  poorfair.  And  the  source  rock for  USS-1  well  have  TOC  contents  fair,  included type  II  and type  III,  maturity  level  is  immature-peak  oil  window  and  potential  yields  is  poor-fair. Source  rock  maturity  time  on  ANS-1  well  is  estimated  at  around  9  Ma  manually  and 14  Ma with  using  software.  DBNA-1  well’s  source  rock  is  recent  manually  and  14  Ma with  using  software,  MRA-1  well’s  source  rock  is  recent  manually  and  5  Ma  with using  software,  DAS-1  well’s  source  rock  is  recent  manually  and  5  Ma  with  using software  while  USS-1  well’s  source  rock  is  recent    with  manually  and  2  Ma  with  using software.  There  are  the  differences  of  maturity time  from  both  methods,  from  manually the  result  is  slower  than  using  software,  because  there  is  no  calculation  for  litology factor, heat flow, and kerogen type.

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