Rock-Type Definition and Pore Characterization of Tight Carbonate Rocks Based on Thin Sections and MICP and NMR Experiments
- Авторлар: Tian F.1, Wang W.2, Liu N.1, Jiang J.2, Niu C.3, Zhang Y.2, Li Y.3
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Мекемелер:
- Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences
- Institute of Quantum Electronics of Peking University
- College of Geosciences, China University of Petroleum
- Шығарылым: Том 49, № 7 (2018)
- Беттер: 631-652
- Бөлім: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/248548
- DOI: https://doi.org/10.1007/s00723-018-0993-2
- ID: 248548
Дәйексөз келтіру
Аннотация
Thick tight Ordovician carbonate rocks are present at depths exceeding 5300 m in the Tahe oilfield and their matrix is considered to contain no storage space. An integrated petrographical and petrophysical study was conducted on a set of 25 tight carbonate core samples from Ordovician strata, covering a wide range of lithologies and textures. Six carbonate rock types were characterized by integrating both petrographical and petrophysical data, including thin-section observations and porosity, permeability, mercury injection capillary pressure and nuclear magnetic resonance (NMR) measurements. We found that thick grainstone and limestone with half-filled fractures exhibited good reservoir properties. NMR testing is an invaluable tool for characterizing pore structures in tight carbonate rocks. For example, six rock types can be identified from the NMR T2 distributions and the changes in pore volume under different pressures (up to 20 MPa) can be calculated. NMR technology can be used to perform rapid and accurate rock-type identification and pore network evaluation in tight carbonate rocks. The results provide an experimental foundation for NMR logging interpretations and advance the understanding of geological and geophysical characteristics of ultra-deep carbonate reservoirs.
Авторлар туралы
Fei Tian
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences
Email: wmw@pku.edu.cn
ҚХР, Beijing, 100029
Weimin Wang
Institute of Quantum Electronics of Peking University
Хат алмасуға жауапты Автор.
Email: wmw@pku.edu.cn
ҚХР, Beijing, 100871
Naigui Liu
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences
Email: wmw@pku.edu.cn
ҚХР, Beijing, 100029
Jiaqi Jiang
Institute of Quantum Electronics of Peking University
Email: wmw@pku.edu.cn
ҚХР, Beijing, 100871
Congkai Niu
College of Geosciences, China University of Petroleum
Email: wmw@pku.edu.cn
ҚХР, Beijing, 102249
Yuandong Zhang
Institute of Quantum Electronics of Peking University
Email: wmw@pku.edu.cn
ҚХР, Beijing, 100871
Yaxi Li
College of Geosciences, China University of Petroleum
Email: wmw@pku.edu.cn
ҚХР, Beijing, 102249