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- Title
Understanding the role of bioturbation in modifying petrophysical properties: a case from well L5 of the third-member Paleocene Funing Formation (E<sub>1</sub>f<sub>3</sub>), Gaoyou Sag, Subei Basin, China.
- Authors
Quaye, Jonathan Atuquaye; Jiang, Zaixing; Liu, Chao; Adenutsi, Caspar Daniel; Adjei, Stephen; Sarkodie, Kwame; Sokama-Neuyam, Yen Adams; Lemdjou, Yanick Brice; Uahengo, Collen-Issia
- Abstract
This study presents a detailed petrophysical characterization of bioturbated reservoir facies retrieved from well L5 of the most oil-productive third-member Paleocene Funing Formation (E1f3). Two siltstones and two sandstone reservoir facies (Rf1, Rf2, Rf3, and Rf4), respectively, are tested and analyzed using petrographic, pressure decay porosimetry, pulse decay permeametry, and TOC techniques. The results indicate that Rf1 (fine-grained, light gray siltstone) is intensely bioturbated (BI = 5; 91–99 vol.%) by Palaeophycus and Taenidium and shows a 64.02% increment in burrow porosity. Rf2 (fine-grained, light gray siltstone) is intensely bioturbated (BI = 5; 91–99 vol.%) by Ophiomorpha, Planolites, and Taenidium with 34% porosity. Rf3 (fine-grained, brown sandstone) is intensely bioturbated (BI = 5; 91–99 vol.%) by Rhizocorallium and Taenidium and indicates a 49.6% burrow porosity increment. Rf4 (fine-grained, brown sandstone) is intensely bioturbated (BI = 5; 91–99 vol.%) by Ophiomorpha, Palaeophycus, and Taenidium with a marginal 4.36% porosity gain. Burrows permeability in all reservoir facies samples improves by approximately 59%, 38%, 52%, and 15%, respectively. The harmonic mean of permeability (vertical fluid flow) best describes the bulk permeability of all reservoir facies. The effects of organic matter (OM) on porosities of Rf1 (0.59% ≤ TOC ≤ 0.76%), Rf2 (0.66% ≤ TOC ≤ 0.98%), Rf3 (0.03% ≤ TOC ≤ 0.05%), and Rf4 (0.04% ≤ TOC ≤ 0.08%) show that OM-hosted porosity is controlled by emplacement of organic matter in Rf2, Rf3, and Rf4 but the removal of organic matter in Rf1. Bioturbation influences porosity, permeability, and TOC, combined with depositional factors such as sorting, grain size distribution, mud-matrix/burrow content, and organic matter-hosted porosity.
- Subjects
CHINA; PETROPHYSICS; PALEOCENE Epoch; BIOTURBATION; PARTICLE size distribution; FLUID flow
- Publication
Arabian Journal of Geosciences, 2023, Vol 16, Issue 7, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-023-11506-x