Method for full-dimension representation and analysis of dense reservoir pore throats

Abstract

The invention discloses a method for full-dimension representation and analysis of dense reservoir pore throats. The method comprises the following steps of 1, data optimization: (a) preparing a dense oil rock sample; (b) using a high-pressure mercury injection apparatus Pore Master to perform mercury injection experiment on a rock sample; (c) using an automatic isothermal adsorption instrument to perform low-temperature nitrogen experiment at the temperature of 77.35K and relative pressure of 0.01-1MPa; (d) according to adsorption type pore throat distribution frequency, accumulating a distribution frequency chart, and performing interpolating on the accumulated distribution frequency chart; (e) connecting the mercury injection type pore throat distribution frequency and the converted adsorption type pore throat distribution frequency at 25nm; 2, data check. The representation method has the advantages that the steps are simple; the pore throat distribution rules of different reservoirs can be analyzed, and the more accurate and deeper evaluation is performed on different dimensions of space microstructures by crossing multiple orders of magnitude.

Description

technical field [0001] The invention belongs to the field of tight oil exploration, and in particular relates to a full-scale characterization and analysis method for tight reservoir pore throats. Background technique [0002] Affected by the successful exploration and development of tight oil in North America, tight oil has developed rapidly in the world, and more than 10 countries including China, Russia, and other countries have actively carried out related research. Tight oil is widely distributed in China, with technically recoverable resources amounting to 20×10 8 ~25×10 8 t, its effective development is crucial to China's energy development. Daqing, Changqing, Sichuan and Dagang are the four typical dense oil producing areas in China. One of the notable features of tight oil is that the reservoir is extremely tight, with widely developed micro-nano-scale pore throats, mainly nano-scale pore throats. Therefore, fine characterization of micro-nanoscale pore-throat s...

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Problems solved by technology

However, this research result can only give the approximate distribution range of pore throats in reserv

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