Microscopic Characteristics of Pore-throat Structures of the Chang 6 Member Tight Oil Layer in the Huaqing Region

doi:10.11885/j.issn.16745086.2016.03.28.03

Abstract

Abstract: Structural characteristics of microscopic pore-throats of the Chang 6 Member tight oil layer of the Triassic Yanchang Formation in the Huaqing Region, Ordos Basin were studied using techniques including constant-speed pumping and microand nano-CT scanning. Results show that the pore spaces in the Chang 6 Member were predominantly microscopic, while nanoscopic pore spaces were less dominant. The mainstream throat radius was 1.07 μm, average throat radius was 0.84 μm, and pore radius was 140.12 μm. The average pore-to-throat ratio was 281.03, representing significant micro/nanoscopic porethroat characteristics. The relationships of pore infiltration with throat radius and pore-to-throat ratio show that pore-throat characteristics are the key factors that influence the physical properties of the tight oil layer. The effects and limitations of porethroat parameters on infiltration rate are more significant than those of porosity. Micro/nano-CT scans on tight oil layers indicate the presence of complex and interconnected micro/nanoscopic pore-throat networks. The three-dimensional reconstruction of micro/nanoscopic pore space reveals that nanoscopic pores are mainly oval, elongated, or irregular, whereas their microscopic counterparts are circular, oval, triangular, and irregular. Tight oil is located in micro-cracks and in the clustered and spherical pore-throat structures with relatively larger pore spaces.

Key words: tight oil layer, microscopic pore-throat structure, Chang 6 Member oil layer, Huaqing Region, Ordos Basin

CLC Number:

TE122.3

XU Liming, NIU Xiaobing, LIANG Xiaowei, CHEN Yajuan, MA Jiye. Microscopic Characteristics of Pore-throat Structures of the Chang 6 Member Tight Oil Layer in the Huaqing Region[J]. 西南石油大学学报(自然科学版), 2017, 39(4): 36-46.

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