Geological Modeling and Material Balance Study of Multilayer Heavy-Oil Reservoirs in Dalimo Field

AUTHOR(S):

TITLE

Geological Modeling and Material Balance Study of Multilayer Heavy-Oil Reservoirs in Dalimo Field

ABSTRACT

Dalimo Field is a heavy oil field, situated on Sumatera Island, Indonesia, operated by an operator on behalf of the Indonesia government. Although the field has been in production since 1976, the recovery factor is low, with significant recoverable reserves remaining unproduced. Current production is coming from 62 wells with total of 11 productive sands. In this case there will be inter-reservoir allocation factor issue due to this field is produced from multilayers sand (commingle production). Consequently, a systematic geological and reservoir engineering investigation is extremely important to be performed to get insight information of the geological and reservoir models. This paper discusses the geological modeling which includes structural modeling, property modeling, and volumetric calculation to obtain original oil inplace (OOIP). Material balance analysis is performed to analyze the reservoir drive mechanism and to obtain the reservoir model which matches to the actual reservoir condition by conducting history matching analysis. Having performed geological modeling and material balance analysis, subsequently, the remaining reserve is calculated. Based on the volumetric calculation, the total of original oil inplace in the Dalimo Field is about 153.30 MMSTB. From production allocation with the permeability-thickness (kh) method, there are five major oil sands which are Sand 1, Sand 2, Sand 3, Sand 4, and Sand 6. Based on the result of material balance analysis, the reservoir drive mechanism in the Dalimo Field is Water Drive mechanism. According to the recovery efficiency (RE) calculation with J.J. Arps et. al. method for water drive reservoir, the total of remaining oil reserve in the Dalimo Field is about 12.79 MMSTB (RE = 19.95%).

KEYWORDS

Inter-reservoir allocation, Geological modeling, Original oil inplace, Material balance, Reservoir drive mechanism, History matching, Remaining reserve, Recovery efficiency.

REFERENCES

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[2] Dake. L. P. Fundamentals of Reservoir Engineering, Elsevier Scientific Publishing Company, Amsterdam; New York; 1978.

[3] Satter, Abdus and C. Thakur, Ganesh. Integrated Petroleum Reservoir Management; A Team Approach, Pennwell Publishing Company, Tulsa, Oklahoma, 1994.

[4] Smith, C.R., Tracy, G.W., Farrar, R.L. Applied Reservoir Engineering Vol 1 & 2, OGCI and PetroSkills Publications, 1992.

Cite this paper

Edo Pratama, Mohd Suhaili Ismail. (2016) Geological Modeling and Material Balance Study of Multilayer Heavy-Oil Reservoirs in Dalimo Field. International Journal of Environmental Science, 1, 106-113