Comparative studies of microscopic pore throat characteristics of unconventional super-low permeability sandstone reservoirs: Examples of Chang 6 and Chang 8 reservoirs of Yanchang Formation in Ordos Basin, China
| Autor: | Ruifei Wang, Lei Zhang, Chi Yungang, Tang Zhixia, Zheng Liu, He Runhua |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Capillary pressure
Petroleum engineering 020209 energy Mineralogy 02 engineering and technology Structural basin 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Permeability (earth sciences) Fuel Technology medicine.anatomical_structure Throat 0202 electrical engineering electronic engineering information engineering medicine Low permeability Injection test Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Petroleum Science and Engineering. 160:72-90 |
| ISSN: | 0920-4105 |
| DOI: | 10.1016/j.petrol.2017.10.030 |
| Popis: | It's difficult to evaluate the unconventional super-low permeability sandstone reservoir by conventional mercury injection test. In order to evaluate this kind of reservoir more efficiently, in this study, we mainly measure the microscopic pore throat characteristic parameters and the curves of the reservoir by constant-rate mercury injection test, such as the average pore radius, average throat radius, pore throat radius ratio, maximum throat radius and other parameters. The reservoir characteristic curves include the pore radius distribution, throat radius distribution, pore throat radius ratio, and capillary pressure. Samples of tight sandstone in typical blocks from the Chang 6 and Chang 8 reservoirs were analyzed by a constant-rate mercury injection test to determine the differences in microscopic pore throat characteristics of unconventional super-low permeability sandstone oil reservoirs in the Yanchang formation of the Ordos Basin. According to the comprehensive classification results of PetroChina, a current super-low permeability reservoir can be classified as super-low permeability class I: 0.5 mD ≤ K ≤ 1.0 mD, super-low permeability class II: 0.3 mD ≤ K K |
| Databáze: | OpenAIRE |
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