PreprintArticleVersion 1Preserved in Portico This version is not peer-reviewed
Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns
Version 1
: Received: 8 December 2023 / Approved: 8 December 2023 / Online: 8 December 2023 (13:17:24 CET)
How to cite:
Yang, W. Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns. Preprints2023, 2023120616. https://doi.org/10.20944/preprints202312.0616.v1
Yang, W. Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns. Preprints 2023, 2023120616. https://doi.org/10.20944/preprints202312.0616.v1
Yang, W. Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns. Preprints2023, 2023120616. https://doi.org/10.20944/preprints202312.0616.v1
APA Style
Yang, W. (2023). Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns. Preprints. https://doi.org/10.20944/preprints202312.0616.v1
Chicago/Turabian Style
Yang, W. 2023 "Comparative Pore-Connectivity and Wettability Characteristics of the Fresh-Water and Saline Lacustrine Tuffaceous Shales: Triggering Mechanisms and Multi-Scale Models for Differential Reservoir-Forming Patterns" Preprints. https://doi.org/10.20944/preprints202312.0616.v1
Abstract
The continental shale layers are more complex in matrix pore-microfracture interactions and connectivity characteristics under the influence of tuff devitrification, which limits the explicit understanding of the coupling relationship between wettability and pore structure, as well as hydrocarbon flow behavior. Therefore, the influence of tuffaceous components on the reservoir formation mechanism and oil-rich effect of the continental shale formation system is a critical issue to be solved. The Upper Triassic Yanchang Formation tuffaceous shale in Ordos Basin and the Middle Permian Jingjingzigou Formation tuffaceous shale in the southern margin of Junggar Basin is taken as the research objects, using whole-rock mineral composition analysis, FE-SEM observation and digital image processing and extraction, as well as wettability angle determination and spontaneous imbibition experiments to illustrate the influence of the difference of devitrification extent on reservoir pore connectivity and interfacial wettability in two different environments of freshwater and saline lacustrine basins, and summarize the reservoir formation differential pattern under the influence of devitrification. The results show that the saline lacustrine is significantly modified by devitrification. The pore plane porosity of the devitrified tuffaceous shales in the saline lacustrine is higher than that of the tuffaceous shales in the freshwater; the oleophilic of the saline lacustrine tuffaceous shales is better than that of the tuffaceous shales in the freshwater, moreover, the pore connectivity of the saline lacustrine tuffaceous shales is better than that of the tuffaceous shales in the freshwater. Wettability and connectivity control the storage performance of shale oil in the tuffaceous shales formation system. The more oleophilic the reservoir wettability is, the better the pore connectivity is, and the better the reservoir of tuffaceous shale formation system is. According to the different extents of devitrification, two different reservoir formation models of freshwater and saline lacustrine are established, which are of great theoretical and practical significance to enrich the theory of shale oil enrichment and reservoir formation in the continental shale formation system and to guide the exploration of continental shale oil benefits.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
