WP4: Assessing capacity for CO2 storage in selected regions of ChinaJonathan Pearce23rd October 2008

Outline

• Introduction to WP4

• Objectives

• Regional studies

• Site assessments

• Outputs

WP4 Partners

UK

• British Geological Survey (BGS)

• BP

• Heriot Watt University

• Shell

China

• China University of Petroleum (CUP) – Beijing and Huadong

• Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS)

• China United Coalbed Methane Co Ltd (CUCBM)

• Jilin Oilfield

• PetroChina

WP4: Storage Options

• Objectives:– Build capacity in China for evaluating storage potential and

performing appropriate first stage site characterisation for site selection.

– Estimate the future potential for CO2 storage. – Mapping of CO2 sources and potential sinks will be carried

out.

• Tasks:– Regional basin assessments of storage potential for EOR,

ECBM and saline formations– Site-selection and assessments for demonstration of

storage.– GIS-based decision support tool will be developed.

Storage Options

• Saline formations– Songliao Basin

• As part of enhanced oil recovery operations– Songliao Basin (Jilin and Daqing oilfields)– Subei Basin (onshore only,

Jiangsu oilfield)

• As part of enhanced coalbed methane production

– Qinshui Basin

WP4 Progress

• WP4 launch meeting in January 2008– Agreed timetable for project– Agreed basins for assessment

• Basin methodologies workshop in May 2008– Agreed methodologies for regional basin assessments– Reviewed initial results for all regions

• Basin Assessment Conference in July 2008– Joint meeting with COACH and GeoCapacity– Reviews of preliminary results for all current projects estimating storage

capacities in China.

• Interim report completed August 2008

Daqing Oil Fielddiscovered in 1959

Jilin Oil Fielddiscovered in 1959

Note: No net to gross ratio applied Field-specific

estimate1 (Mt)CSLF effective capacity (Mt)

Oil field 1% 2% 10%

Lamadian 11 22 109 149

Sa’ertu 16 31 157 226

Xingshugang 5 10 50 72

Gaotaizi 0.1 0.1 0.6 1

Taipingtun 0.3 0.6 2.6 4

Putaohua 0.4 0.5 4.4 6

Aobaota 0.1 2.6 0.7 1

total 32 65 324 459

Daqing oilfield estimated capacities

1CUP methodology - Assumes volumetric replacement for oil and dissolution in both oil and formation water

Jillin Oilfields estimated capacities

Note: No net to gross ratio applied

CSLF effective capacity (Mt) Field-specific estimate1 (Mt)

Oil field 0.01 0.02 0.10

Hongang 0.30 0.60 3.00 3.7

Xinli 0.63 1.25 6.25 8.2

Mutou 0.19 0.39 1.95 2.7

Qian’an 1.35 2.70 13.50 18.4

Yingtai 1.09 2.18 10.92 14.9

totals 4 7 36 47.9

1CUP methodology - Assumes volumetric replacement for oil and dissolution in both oil and formation water

① Jinhu

② Gaoyou

③ Qintong

④ Hai'an

⑤ Baiju

⑥ Yancheng

⑦ Funing

⑧ Liannan

⑨ Lianbei

⑩ Hongze

①

⑩

⑨

⑧⑦

⑥

⑤

④③②

Troughs

Caoshe Oilfield

Binhai Uplift

Yanfu Depression

Dongtai Depression

Jianhu Uplift

--Oilfield

Assessment results

• 108 oil reservoirs of Jiangsu Oilfield have been assessed.

– Total CO2 storage potential is 20.4614 Mt .

• 75 reservoirs are suitable for CO2 EOR.

– Calculation assumes CO2 trapping during EOR process only– Storage capacity of 15.76 Mt during the EOR process

• 33 reservoirs are suitable for CO2 storage.

– Based on volume of recoverable reserves– Storage capacity of 4.70 Mt

Stratum of Songliao Basin

main saline aquifer: Qingshankou Fm

well1 well2 well3

K2qn

K2n

K2q

K2y

The stratigraphic sequences are dominated by Cretaceous fluvial and lacustrine strata with volcanic and volcaniclastic rocks.

5 hydrostratigraphic units classified from bottom to top: JD, K2q, K2qn, K2y, K2n

Effective storage capacity

of Deep saline aquifers in Songliao Basin

(Storage coefficient of 1–2–10% applied)

Songliao Basin (260,000 km2)

Average height 380m

Average reservoir porosity 10%

CO2 density at reservoir conditions 700 kg/m3

Total regional effective storage capacity:

Note: No net to gross ratio applied

CSLF effective capacity (Mt)

1% 2% 10%

69160 138320 691600

Next steps…

• Finalise basin reports

• Site assessments and reports

• Recommended sites for feasibility studies in Phase 2

Conclusions

• Jilin, Daqing and Jiangsu oilfields offer variable potential for CO2 storage – They provide some storage potential as niche opportunities for CO2-

EOR – especially in Jilin and Daqing– Small pilot CO2-EOR projects are already being undertaken– As such may provide incentives for a small-scale pilot demonstration

of CCS.

• Theoretical calculations for a selected saline aquifer suggests that the Qingshankou Formation could offer very large storage capacities– However, this is based on very low data density (concentrated

around oilfields)– Further primary data acquisition is necessary to refine this estimate.– Comparisons with underlying reservoirs suggest specific field

geology likely to be equally complex.

Jonathan PearceBritish Geological Survey, United Kingdom.Email: jmpe@bgs.ac.ukTel: +44 (0)115 9363222