Academic Journal
Petrophysical properties and their influencing factors of carbonates in the fourth member of Sinian Dengying Formation, Sichuan Basin, SW China
| Title: | Petrophysical properties and their influencing factors of carbonates in the fourth member of Sinian Dengying Formation, Sichuan Basin, SW China |
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| Authors: | Jiaqing WANG, Jixin DENG, Zhonghua LIU, Longlong YAN, Hui XIA |
| Source: | Petroleum Exploration and Development, Vol 50, Iss 6, Pp 1358-1373 (2023) |
| Publisher Information: | KeAi Communications Co., Ltd., 2023. |
| Publication Year: | 2023 |
| Subject Terms: | Sichuan Basin, Sinian Dengying Formation, carbonate rock, sedimentary environment, diagenesis, petrophysical properties, Petroleum refining. Petroleum products, TP690-692.5 |
| More Details: | Based on the measurements of petrological, petrophysical and elastic properties of the samples of different sedimentary facies in the fourth member of Sinian Dengying Formation (Deng 4 Member) in the Sichuan Basin, the diagenetic processes of reservoirs of different sedimentary facies and their controls on the petrophysical properties were discussed. The results show that cracks and mineral composition jointly control the petrophysical properties, and both are significantly influenced by sedimentary environment and diagenesis. The microbial dolomite of mound-shoal facies mainly experienced multi-stage dolomitization, penecontemporaneous dissolution, tectonic rupture and hydrothermal/organic acid dissolution processes, giving rise to cracks and dissolved pores. The grannular dolomite of inter-mound-shoal bottomland or dolomitic lagoon facies mainly underwent mechanical compaction, burial dolomitization and tectonic-hydrothermal action, creating cracks and intercrystalline pores. The diagenesis related to crack development increases the pressure- and saturation-dependent effects of samples, leading to significant decrease in the compressional wave impedance and Poisson's ratio. Dolomitization changes the properties of mineral particles, resulting in a Poisson's ratio close to dolomite. The muddy, siliceous and calcareous sediments in the low-energy environment lead to the decrease of impedance and the differential change of Poisson's ratio (significantly increased or decreased). The samples with both cracks and dissolved pores show high P-wave velocity dispersion characteristics, and the P-wave velocity dispersion of samples with only fractures or pores is the lowest. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English Chinese |
| ISSN: | 1876-3804 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S1876380424604726; https://doaj.org/toc/1876-3804 |
| DOI: | 10.1016/S1876-3804(24)60472-6 |
| Access URL: | https://doaj.org/article/5389426cb711443bb6f176f2f22e9547 |
| Accession Number: | edsdoj.5389426cb711443bb6f176f2f22e9547 |
| Database: | Directory of Open Access Journals |
| ISSN: | 18763804 |
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| DOI: | 10.1016/S1876-3804(24)60472-6 |
| Published in: | Petroleum Exploration and Development |
| Language: | English Chinese |