The pore and throat size of the global unconventional oil and gas reservoir is mainly nano-scale, and the minimum radius is evenly about 1 nm. The characteristics of the unconventional oil reservoir depend greatly on the micro pore structure of the reservoir. Its main contents include the shape, size, quantity, connectivity and distribution characteristics of reservoir pores and throats. The research methods of microscopic pore structure of reservoirs mainly include: digital core technology and experimental testing which is widely used in the practical work. has great limitations. For example, Low-temperature nitrogen adsorption method is used in the study of pore structure and its effective range is 2 nm - 50 nm, which has limited significance for the study of tight oil exploration; The test range of pore and throat radius of high pressure mercury technology is extended to 1.8nm-500um, but it may cause fracture easily when the mercury pressure reaches high level and have a large error in the test of small pores. In order to enhance oil recovery, it is necessary to establish a full-scale distribution diagram to complete the different oil zones in the tight oil zone reservoir by combining high-pressure mercury intrusion, low-temperature nitrogen adsorption and other measuring means. By using a full-scale distribution diagram,we could put forward the comprehensive classification evaluation method, establish micro-nano flow mathematical model, reveal the permeating law and provide theoretical support and technical guidance for the unconventional reservoir.
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