Pore Throat Structure and Fractal Characteristics of Tight Sandstone Reservoirs: A Case Study of Upper Montney Formation in Block A in Western Canada Sedimentary Basin

doi:10.7657/XJPG20210416

Abstract

Abstract:

In order to further characterize the structure and fractal characteristics of different pore throats in tight sandstone reservoirs, the tight sandstone samples from Upper Montney formation in Block A of western Canada sedimentary basin are studied by using cast thin section, SEM and high pressure mercury injection analyses. The results show that the pore types of the reservoir in the study area mainly include dissolution pore, primary residual intergranular pore and intercrystal micropore, and a small number of microfractures are noted. Most of the pore throat radius of the reservoir is less than 0.30 μm, showing a curve with multiple peaks, and the effective storage space is mainly composed of nano- and submicron- pores. The tight sandstones in the study area can be divided into Type Ⅰ, Type Ⅱ and Type Ⅲ with the corresponding average overall fractal dimensions of 2.31, 2.46 and 2.63, respectively. The Type I samples have relatively good physical properties and relatively weak heterogeneity. The fractal characteristics of pore throats with different sizes are different. The fractal dimension of the submicron pore throats is higher than that of nano pore throats, indicating a stronger heterogeneity of the submicron pore throats. The fractal dimension of pore throats is related to pore throat structure, and the development of different pore throats in tight sandstone reservoirs results in different heterogeneity of pore throats.

Key words: western Canada sedimentary basin, Lower Triassic, Montney formation, tight sandstone, pore throat structure, fractal dimension, high pressure mercury injection, reservoir type

CLC Number:

TE122.23

Huang Yiming, Richard COLLIER. Pore Throat Structure and Fractal Characteristics of Tight Sandstone Reservoirs: A Case Study of Upper Montney Formation in Block A in Western Canada Sedimentary Basin[J]. Xinjiang Petroleum Geology, 2021, 42(4): 506-513.

Figures/Tables 10

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