A Study on the Characteristics of Reservoir Pore Structure Based on Nand Mercury Injection Data

doi:10.11885/j.issn.1674-5086.2020.11.13.11

Abstract

Abstract: X1 Wellblock is located in the Changshaling structural belt of Ying'er Sag, Jiuquan Basin. The rock types of this reservoir of the first member in Xiagou Formation of Lower Crataceous are mainly lithic sandstone and feldspar lithic sandstone. Reservoir heterogeneity is strong, and thin interbedded sand and mudstone are especially developed, which brings great difficulties to reservoir comprehensive evaluation. However, fluid identification, reservoir evaluation and later development measures depend on the overall understanding of pore structure of reservoir to a large extent. Taking X1 Wellblock in Changshaling as an example, the statistical analysis was carried out on the mineral composition in the study area, the pore types are classified study of electron microscopic thin section(SEM) observation, and then the key works, under the wellblock of mercury injection and nuclear magnetic resonance T₂ spectrum of test data, established the quantitative calculation methods of core pore throat radius and the T₂ relaxation time spectrum, and connecting with the nuclear magnetic resonance (NMR) logging data. A method for continuously and quantitatively characterizing the variation characteristics of reservoir pore-throat radius is developed. The quantitative characterization of pore-throat radius can provide ideas for us to understand the change of reservoir porosity and permeability, and provide more abundant information for the study of reservoir pore structure and reservoir heterogeneity.

Key words: nuclear magnetic resonance, mercury injection curve, pore radius, pore structure, T₂ spectrum

CLC Number:

TE122

ZHANG Qian, TANG Haizhong, MU Mingyang, WEI Jun, ZENG Ligang. A Study on the Characteristics of Reservoir Pore Structure Based on Nand Mercury Injection Data[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 33-42.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.11.13.11

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