Electron microscope identification method for residual oil in light reservoir nanopores and device for executing method

A technology of tight reservoirs and nano-pores, applied in the field of petroleum exploration, can solve the problems of identification difficulties, fallacies, loss of resolution, etc., and achieve the effect of solving the inability to distinguish the difference between the two, ensuring the ability to distinguish and high resolution.
CN104237267AActive Publication Date: 2014-12-24PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2014-12-24

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Abstract

The invention relates to an electron microscope identification method for residual oil in light reservoir nanopores and a device for executing the method. The method comprises the following steps: obtaining an electron microscope sample; processing the electron microscope sample to obtain a flat section with exposed micro-nanopores; obtaining an back scattering image without an electric charge phenomenon on the flat section with the exposed the micro-nanopores, wherein the back scattering image without the electric charge phenomenon displays the micro-nanopores and distribution of the protogenetic organic matter; on the same imaging position, obtaining an back scattering image of residual oil charges, which displays the micro-nanopores and distribution of the protogenetic organic matter; respectively extracting the pores from the back scattering image without the electric charge phenomenon and the back scattering image of the residual oil charges to obtain distribution of the residual oil in a three-dimensional porous space, so as to realize identification of residual oil in the light reservoir nanopores.
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Description

technical field

[0001] The invention relates to the technical field of petroleum exploration, in particular to an electron microscope identification method and device for residual oil in nanopores of tight reservoirs, which are suitable for the characterization of unconventional reservoirs such as tight sandstone and tight carbonate rock. Background technique

[0002] In my country, tight oil resources have huge potential and are widely distributed. Key areas include the Ordos Basin, Sichuan Basin, Bohai Bay Basin, Jiuquan Basin, Junggar Basin, etc. The reservoir lithology includes tight sandstone and tight carbonate rock. The storage space of tight reservoirs is mainly composed of micro-nano pore-throat systems. Nano-CT imaging technology, cross-sectional ion polishing technology, field emission scanning electron microscopy imaging, and focused ion beam scanning electron microscopy (FIB-SEM) imaging are used to analyze the pores of this scale. And other technologies have be...

Claims

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