Quantitative characterization method of low penetration double-medium sandstone oil reservoir microscopic aperture structure

Abstract

The invention provides a quantitative characterization method of low penetration double-medium sandstone oil reservoir microscopic aperture structure, which comprises the following steps: selecting experiment samples, effectively combining various experiments, distributing samples, processing and analyzing experiment test data, combining macroscopic background and microscopic rock core, and combining static state analysis and dynamic production reality, thereby realizing quantitative characterization of ultra-low penetration double-medium sandstone oil reservoir microscopic aperture structure from qualitative analysis and semi-quantitative evaluation. The invention has the advantages that more comprehensive influence factors and micro crack, aperture throat parameter and nuclear magnetic resonance movable fluid parameter are considered, so the characterization result can better reflect change characteristics of ultra-low penetration double-medium sandstone oil reservoir microscopic aperture structure, which are consistent to the production exploitation real cases of the oil field, thereby effectively avoiding one-sidedness and limitation of single aspect evaluation result.

Description

Technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for quantitatively characterizing the micro-pore structure of an ultra-low permeability dual-medium sandstone reservoir. Background technique [0002] The microscopic pore structure of dual-porosity sandstone reservoirs is a key factor in controlling reservoir quality and development effects. It is one of the core issues for the efficient development of ultra-low permeability reservoirs. It mainly includes pore throat types, pore-throat matching relationships, and pore-throat changes. Features and the degree of micro-fracture development. [0003] Fracture research methods mainly include core observation method, in-situ stress analysis method, modern well test analysis and logging interpretation method, and production performance analysis method. 2003 Vol. 3 Issue 2, Petroleum Exploration and Development. Wang Jing et al. applied the permeability anomaly frequenc...

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Problems solved by technology

In 2003, Volume 3, Issue 2, Petroleum Exploration and Development, Wang Jing et al. applied the permeability anomaly frequency analysis method to analyze the plane distribution of micro-fractures in the Yanchang Formation main oil layer in the Ordos Basin in the article "Exploration of Micro-fracture Distribution Research Method in Ultra-low Permeable Sandstone". In 2003, Vol. 3, No. 2, Petroleum Exploration and Development, Wang Fachang et al. analyzed the fracture distribution characteristics of ultra-low permeability sandstone oil layers in Baka Oilfield, Turpan-Hami Basin through core observation. Distribution characteristics of fractures in ultra-low permeability sandstone oil layers; 2004, Volume 39, Issue 1, Geological Sciences, in the article "Fractures and Seepage Characteristics of Low Permeability Sandstone Oil and Gas Reservoirs" by Zeng Lianbo, through the analysis of outcrops and cores of different structural types, the low The development laws of fractures in permeable sandstone oil and gas reservoirs were compared; in 2007, Volume 28, Issue 5, Journal of Petroleum, Hao Mingqiang et al. used constant-speed mercury intrusion, nuclear magnetic Resonance and pressure sensitivity experiment methods are used to study the reservoir characteristics of microfractured ultra-low permeability reservoirs, and compare the differences between fractured and non-fractured reservoir characteristics, but the fracture parameters are not expressed

[0006] (1) Existing studies only focus on micro-cracks or pore-throat features, and do not consider the comprehensive characterization method in the case of the co-existence of micro-cracks and pore-throat features

[0007] (2) The pore structure of the ultra-low permeability dual-media sandstone reservoir is complex, and the computer network model, simulation method and classification theory have obvious limitations;

[0008] (3) The existing research methods are not combined enough to achieve effective matching and integration of multiple technologies to form a systematic characterization method

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