Journal
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
Volume 12, Issue 3, Pages 825-834Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13202-021-01338-4
Keywords
Ordos Basin; Chang 7 oil group; Seepage capacity; Compressibility; Six-element classification coefficient; Classification evaluation method
Funding
- National Science and Technology Major Project of the Ministry of Science and Technology of China [2017ZX05013-004, 2017ZX05069-003]
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The Chang 7 oil group in the Ordos Basin has been evaluated for sweetness classification through a combination of field practice and laboratory experiments, providing a reference basis for optimal well design.
The Chang 7 oil group in the Ordos Basin has the characteristics of a tight lithology, a low formation pressure coefficient and strong reservoir heterogeneity. To better determine reasonable developmental technical countermeasures, oiliness, seepage capacity, and compressibility evaluations are combined. Using a combination of field practice and laboratory experiments, six types of sweetness classification evaluation parameters are screened: oil saturation, longitudinal oil layer structure coefficient, average pore throat radius, gas-oil ratio, brittleness index, and minimum horizontal principal stress. By combining the relationships among variables with the initial production from directional wells, the gray correlation method is used to quantify the weights of the contributions of evaluation parameters to production. On this basis, using the difference method for the curve slope, a sweetness evaluation and classification method for the Chang 7 oil group is constructed, and it solves the difficult problem of quality difference classification for the Chang 7 oil group and provides a reference basis for the optimal design of well patterns and fracturing reconstruction parameters.
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