Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 81, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/s12665-021-09994-9
Keywords
Probabilistic method; Reserves per unit coefficient; Fractured-vuggy reservoir; Reserves calculation; Tahe Oilfield
Funding
- Regional innovation Cooperation Project Research and Application of Related Technologies for efficient development of Complex Reservoirs [21QYCX0050]
- Sichuan Science and Technology Department
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This study improves the accuracy of reserve calculation for fractured-vuggy reservoirs in the Tahe Oilfield by using the probability method. The research findings indicate that reservoirs controlled by weathering crust are the most favorable, while Aidingbei and Yuqi porous reservoirs have better resource prospects.
Due to the strong heterogeneity of fractured-vuggy reservoirs in Tahe Oilfield, the results of reserves calculated using the Volumetric Method are not ideal. To improve the calculation accuracy of reserves, this study selected 524 evaluation Wells of the fractured-vuggy reservoir in Tahe Oilfield, and adopt the probability method (or Monte Carlo method) to establish the characteristics and distribution model of reserves per unit coefficient (RPUC) based on the reservoir geological conditions, crude oil density, and development process. From the mathematical test, the Beta function is more applicable to represent the probability model of the RPUC parameters. The RPUC of reservoirs controlling by weathering crust is found to be the greatest, and proved to be the most favorable reservoir in this area. The calculation results obtained using the probability method are more reliable, compared to the other three methods, which are in line with the estimated reserves during oil and gas exploration. The RPUC values of reservoirs reveal that Aidingbei, and Yuqi porous reservoirs were relatively developed with better resource prospects. The above research can provide a reference for the calculation of the reserves for the fractured-vuggy carbonate reservoir of the new area in the Tarim Basin.
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