Assessment of CO2 storage potential in oil/gas bearing reservoir in Songliao basin

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Assessment of CO2 storage potential in oil/gas
bearing reservoir in Songliao basin
Mingyuan Li China University of Petroleum,
Beijing August 21, 2009
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Background
Variation of the Earths surface
temperature Years 1000 to 2100
Since 1979, more than 20 of the Polar ice Cap
has melted away(2005)
CO2 is one of the greenhouse gases
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Global CO2Emissions
Source Energy Information Administration/Internat
ional Energy Outlook 2001
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Options for CO2 Sequestration

• Deep saline aquifer
• Depleted oil and gas reservoirs
• CO2-EOR
• Coal beds
• Ocean

CO2-EOR could offset the cost of CO2
sequestration or CCS
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CO2-EOR(Enhanced Oil Recovery)
Oil recovery by CO2- EOR in USA
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Great potential of CO2-EOR and storage in China

• China has a proved OOIP of low-permeability
  reservoirs as 6.32 billion tons, which is 28.1
  of the total proven OOIP.
• Gas or CO2 injection could improve the oil
  recovery of these oil fields.
• CO2 is a valuable resource for oil recovery and
  60 of CO2 injected could be stored in the
  reservoirs.

Main oil/gas fields in China
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CO2 EOR pilot projects in China

• Jilin Oil Field, CO2 flooding, 2006
• CO2 source,natural gas, 10-14 of CO2,
• 10 injection wells and 28 production wells
• Shengli Oil Field, CO2 flooding, 2007
• CO2 source,power plant,13.5, 4.15106 t/y ,
  4 injection wells and 12 production wells
• Daqing Oil Field, CO2 flooding, 2007
• CO2 source, natural gas, 20 of CO2

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Main projects on CCS in China

• Enhanced Oil Recovery by Utilizing Greenhouse gas
  (973 project), China Ministry of Science and
  Technology, 2006
• GeoCapacity, China-EU, 2006
• Cooperation Action within CCS China-EU, (COACH),
  2006
• Near Zero Emissions Coal Initiative (NZEC) ,
  China-UK, 2007
• Support to Regulatory Activities for Carbon
  Capture and Storage (STRACO2), China-EU, 2007
• China Australia Geological Storage (CAGS)
  project, China- Australia,
• 2009

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NZEC Project

• UK-China NZEC project was started in 2007
• Coordinator AEA-UK, ACCA21- China
• Work packages of NZEC project includes
• WP1. Knowledge sharing and capacity
  building
• WP2. Future technology perspectives
• WP3. Case studies for CO2 capture
• WP4. CO2 storage potential
• WP5. Policy assessment
• Main aim of NZEC project
• To achieve a common understanding of the
  potential applications for a range of carbon
  capture technologies in the power generation
  sector.
• To build capacity for evaluating storage
  potential and performing appropriate first stage
  site characterisation for site selection in
  China.

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WP4. CO2 storage potential

• WP leader and partner
• BGS, Heriot Watt Univ., BP, Shell.
• China University of Petroleum(CUP) Beijing
  
• Chinese Academy of Sciences (CAS), Tsinghua
  
• University, CUCBM
• Aim
• To assesses CO2 storage potential in China
• and undertake preliminary characterization
  for
• site selection of CO2 storage.
• Objectives
• To provide information on the future
  potential
• for CO2 storage as enhance oil recovery
  (EOR),
• enhanced coal-bed methane (ECBM) and storage
  
• in saline aquifers in a range of basins.

Daqing oil field 720 km2 Jilin oil field
510 km2
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Methodologies
Assessment model for CO2 storage potential
(CUP) M (CO2) M1M2M3M4 M (CO2) -
total storage capacity of CO2 (m3) M1 - storage
capacity of CO2 dissolved in oil and water in oil
bearing reservoir M2 - storage capacity
of CO2 dissolved in formation water M3 - storage
capacity of CO2 in oil bearing reservoir during
CO2 flooding M4 - storage capacity of
CO2 reacted with rock
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• M (CO2) EfAhfSoR0 (CO2) (1- S0)Rw (CO2)
  
• hAfRw (CO2) (Mp4/?f)
• E f overall sweep efficiency(fraction),
  Ef5-25, assume Ef18
• Aoil-bearing area (m2)
• hformation thickness (m)
• fporosity (fraction)
• Sooil saturation (fraction),assume So75
• R o(CO2) CO2 solubility in oil (fraction)
• R w(CO2) CO2 solubility in water(fraction)
• SwCO2 solubility in formation water (fraction)
• Mpresidual oil in reservoir (104t)(in 2000)
• ?foil density in formation (kg/m3)

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CO2 storage potential in Songliao basin
The basic parameters of the oil bearing
reservoirs in Daqing oil field complex
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CO2 storage capacity in oil bearing reservoirs of
Daqing oil field complex
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Reservoir parameters of Jilin oil field complex
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CO2 storage capacity in Jilin oil field complex
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CO2 -EOR potential in Songliao basin
EOR potential by CO2 flooding in Daqing oil field
complex (Mt)
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EOR potential by CO2 flooding in Jilin oil field
complex (Mt)
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Conclusion

• The oil/gas bearing reservoirs in Songliao basin
  could be for CO2 storage and the total storage
  capacity of CO2 is about 506.7 Mt as CO2 is
  stored in a supercritical state.
• The storage capacity of CO2 dissolving in
  formation waters (M2) is about 55-67.8 of the
  total storage capacity of CO2 in Daqing and Jilin
  oil fields.
• The potential of the oil enhanced by CO2 flooding
  could be large in Daqing and Jilin oil fields.

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Thanks