Offshore Storage Resource Assessment - Final Scientific/Technical Report
- NITEC LLC, Denver, CO (United States)
The DOE developed volumetric equation for estimating Prospective Resources (CO2 storage) in oil and gas reservoirs was utilized on each depleted field in the Federal GOM. This required assessment of the in-situ hydrocarbon fluid volumes for the fields under evaluation in order to apply the DOE equation. This project utilized public data from the U.S. Department of the Interior, Bureau of Ocean Energy Management (BOEM) Reserves database and from a well reputed, large database (250,000+ wells) of GOM well and production data marketed by IHS, Inc. IHS interpreted structure map files were also accessed for a limited number of fields. The databases were used along with geological and petrophysical software to identify depleted oil and gas fields in the Federal GOM region. BOEM arranged for access by the project team to proprietary reservoir level maps under an NDA. Review of the BOEM’s Reserves database as of December 31, 2013 indicated that 675 fields in the region were depleted. NITEC identified and rank these 675 fields containing 3,514 individual reservoirs based on BOEM’s estimated OOIP or OGIP values available in the Reserves database. The estimated BOEM OOIP or OGIP values for five fields were validated by an independent evaluation using available petrophysical, geologic and engineering data in the databases. Once this validation was successfully completed, the BOEM ranked list was used to calculate the estimated CO2 storage volume for each field/reservoir using the DOE CO2 Resource Estimate Equation. This calculation assumed a range for the CO2 efficiency factor in the equation, as it was not known at that point in time. NITEC then utilize reservoir simulation to further enhance and refine the DOE equation estimated range of CO2 storage volumes. NITEC used a purpose built, publically available, 4-component, compositional reservoir simulator developed under funding from DOE (DE-FE0006015) to assess CO2-EOR and CO2 storage in 73 fields/461 reservoirs. This simulator was fast and easy to utilize and provided a valuable enhanced assessment and refinement of the estimated CO2 storage volume for each reservoir simulated. The user interface was expanded to allow for calculation of a probability based assessment of the CO2 storage volume based on typical uncertainties in operating conditions and reservoir properties during the CO2 injection period. This modeling of the CO2 storage estimates for the simulated reservoirs resulted in definition of correlations applicable to all reservoir types (a refined DOE equation) which can be used for predictive purposes using available public data. Application of the correlations to the 675 depleted fields yielded a total CO2 storage capacity of 4,748 MM tons. The CO2 storage assessments were supplemented with simulation modeling of eleven (11) oil reservoirs that quantified the change in the stored CO2 storage volume with the addition of CO2-EOR (Enhanced Oil Recovery) production. Application of CO2-EOR to oil reservoirs resulted in higher volumes of CO2 storage.
- Research Organization:
- NITEC LLC, Denver, CO (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- Contributing Organization:
- BOEM
- DOE Contract Number:
- FE0026392
- OSTI ID:
- 1429325
- Report Number(s):
- DOE-NITEC-FE0026392
- Country of Publication:
- United States
- Language:
- English
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