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Construction and analysis of high-resolution digital cores for organic shales

A high-resolution, digital core technology, applied in the field of petroleum logging petrophysics research, can solve problems such as expensive, unable to reflect different saturation conditions, limiting influencing factors and microscopic response laws

Pending Publication Date: 2019-01-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0004] For organic shale, the current FIB-SEM imaging technology is relatively expensive, which limits the use of this technology
Moreover, this technology is not only for shale, the experimental results are for specific cores, which cannot represent all kinds of rocks, cannot reflect the situation of different wettability, can not reflect the situation of different saturation, and cannot simulate different gas saturation situation
Therefore, the current technological progress limits the study of influencing factors and microscopic response laws in subsequent microscopic numerical simulations.

Method used

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  • Construction and analysis of high-resolution digital cores for organic shales
  • Construction and analysis of high-resolution digital cores for organic shales
  • Construction and analysis of high-resolution digital cores for organic shales

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Embodiment

[0096] 1. Shale sample preparation and synchrotron radiation scanning

[0097] The high-resolution scanning of shale cores was carried out at the 4W1A-X-ray imaging experimental station under the Beijing Synchrotron Radiation Facility Experimental Station of the Institute of High Energy Physics, Chinese Academy of Sciences. The light source used in the experimental station is the 4W1A beamline, which is the longest beamline at the Beijing Synchrotron Radiation Facility. It can provide a well-collimated X-ray beam, and the nano-imaging equipment can achieve a spatial resolution of up to 30 nanometers. The X-ray nano-resolution three-dimensional imaging experiment can provide two experimental modes: high-resolution mode and large field of view mode: the imaging field size of high-resolution mode is 15μm×15μm, the achievable resolution is 50nm (standard sample), and the large field of view The pattern imaging field size is 60μm×60μm. Because shale rock samples are relatively den...

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Abstract

A construction and analysis of high-resolution digital cores for organic shales is disclosed. The method is characterized by comprising such steps as A, performing synchrotron radiation scanning on said synchrotron radiation scanning data; B. carrying out threshold filtering processing on that gray-scale image of the shale core, so that the boundary between the rock pores and the skeleton becomesmore obvious and smoother, and noise point generated in the process of CT scanning and reconstruction are eliminated; C. performing threshold segmentation of CT images to divide the rock framework andporosity. The invention has the beneficial effects that the method and the process of organic shale high-resolution imaging and digital core construction are completely introduced. In the calculationof the threshold value of skeleton and pore, the ratio of the property difference between the two groups to the difference within the group reaches the maximum to determine the threshold value, and the pore composition, mineral, kerogen and other components can be accurately distinguished.

Description

technical field [0001] The invention relates to the field of petroleum logging rock physics research, in particular to a method for constructing and analyzing organic shale high-resolution digital cores. Background technique [0002] Shale oil and gas is an important type of unconventional oil and gas. The research on the petrophysical properties of organic shale is the basis of reservoir logging evaluation and seismic prediction. Rock physics research mainly includes theoretical method research, rock physics experiment and digital rock physics analysis technology developed in recent years. Due to the small pores and complex mineral composition of shale, digital core analysis and numerical simulation technology is an effective analysis method. Therefore, how to combine the characteristics of organic shale to construct an effective digital core model close to reality is the basis and key of microscopic numerical simulation. [0003] At present, there are two categories of d...

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Application Information

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IPC IPC(8): G06T17/10G06T19/20G06T5/00G06T5/20G06T7/11G06T7/136
CPCG06T5/20G06T7/11G06T7/136G06T17/10G06T19/20G06T2207/10061G06T2207/10081G06T2207/20032G06T2200/08G06T5/70
Inventor 谭茂金王琨苏梦宁
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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