Fractal Characteristics of Pore-Throats Structure and Quality Evaluation of Carbonate Reservoirs in Eastern Margin of Pre-Caspian Basin

Xing Zeng, Weiqiang Li (), Jue Hou, Wenqi Zhao, Yunyang Liu and Yongbo Kang
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Xing Zeng: Research Institute of Petroleum Exploration & Development, China National Petroleum Corporation, Beijing 100089, China
Weiqiang Li: PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
Jue Hou: Research Institute of Petroleum Exploration & Development, China National Petroleum Corporation, Beijing 100089, China
Wenqi Zhao: Research Institute of Petroleum Exploration & Development, China National Petroleum Corporation, Beijing 100089, China
Yunyang Liu: Research Institute of Petroleum Exploration & Development, China National Petroleum Corporation, Beijing 100089, China
Yongbo Kang: China’s Oil & Gas Exploration and Development Company, Beijing 100089, China

Energies, 2022, vol. 15, issue 17, 1-13

Abstract: The Carboniferous reservoir KT-II layer in the Eastern margin of the Pre-Caspian Basin was formed in the open platform sedimentary environment and marked by a complicated pore-throats structure. Understanding the main controls on the carbonate reservoir quality is of great significance for reservoir classification and a relevant production prediction. This study focuses on revealing reservoir pore-throats structure’s fractal characteristics by analyzing the mercury intrusion capillary pressure (MICP), with the integration of the pore-throats radius’ distribution data. The relationship between fractal dimensions and reservoir parameters such as physical properties, mercury median saturation pressure (Pc50) and the proportion of large-size (radius > 0.1 μm) pores demonstrate that the lower fractal dimension corresponds not only to core plug samples with higher permeability, but also to lower Pc50 and a higher proportion of large pore-throats. Three classes of carbonate reservoir with different qualities were defined according to their fractal dimensions, petrophysical properties and photomicrograph features, et al. Combined with flow profiles from Production Log Tool tests, the relationship between the carbonate reservoir type and production behavior was revealed, thus providing suggestions on the middle and late stage of the water flooding production adjustment strategy. This work provides a typical case study for the further comprehensive evaluation and classification of a carbonate reservoir and it is quite meaningful for production efficiency optimization.

Keywords: carbonate rock; capillary pressure; pore-throats structure; fractal dimension; reservoir classification and evaluation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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