Method for Determining Organic Pore Content and Pore Size Distribution of Shale

A pore size distribution and mud shale technology, which is applied in the field of shale gas exploration, can solve the problems of inability to measure the organic pore content and pore size distribution of the full pore size of mud shale

Active Publication Date: 2020-08-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention provides a method for determining the organic pore content and pore size distribution of mud shale, so as to at least solve the technical problem in the prior art that the organic pore content and pore size distribution of the full pore size (1-1000nm) of mud shale cannot be measured

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  • Method for Determining Organic Pore Content and Pore Size Distribution of Shale
  • Method for Determining Organic Pore Content and Pore Size Distribution of Shale

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Embodiment 1

[0039] figure 1 It is the 10nm resolution large field of view SEM secondary electron image of the present embodiment; figure 2 It is the HIM secondary electron image of the 1nm resolution small field of view of this embodiment; image 3 Be the organic pore conversion rate T of this embodiment si intersection plot with aperture i (schematic); Figure 4 Be the organic pore conversion rate T of an embodiment of the present invention hi intersection plot with aperture i (schematic); Figure 5 T in the same coordinate system of this embodiment si and aperture i, T hi Intersection plot with pore size i (i.e. schematic diagram of organic pore conversion rate for full pore size (1-1000nm)); Figure 6 For the full aperture (1-1000nm) organic hole conversion rate T of the present embodiment i The schematic diagram of the curve with the pore size i (that is, the organic pore conversion rate T i distribution diagram); Figure 7 For the full aperture (1-1000nm) organic pore size ...

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Abstract

The invention provides a method for determining organic pore content and pore size distribution of shale. The method comprises the following steps: 1) scanning and imaging a shale sample by utilizingSEM and HIM; 2) based on the SEM secondary electronic image, determining an organic pore conversion rate Tsi of which the pore diameter is i according to a formula; 3) based on the HIM secondary electronic image, determining an organic pore conversion rate Thi of which the pore diameter is i according to a formula; 4) drawing a cross plot of Tsi and i and a cross plot of Thi and i in the coordinate system; 5) according to the distribution trend of Tsi and Thi, determining an organic pore conversion rate according to a formula or determining an organic pore total conversion rate T; and 6) obtaining the volume ratio of the organic matters in the shale sample, determining the volume content of the organic pores according to a formula, or determining the pore size distribution of the organic pores. The method provided by the invention can effectively determine the full-pore-size organic pore content and pore size distribution of the shale.

Description

technical field [0001] The invention relates to the field of shale gas exploration, in particular to a method for determining the organic pore content and pore size distribution of mud shale. Background technique [0002] Shale gas in shale is a fossil energy that has been developed in recent years. Compared with conventional reservoirs such as sandstone and carbonate rock, shale reservoirs are very dense and have very small pores. The oil and gas in conventional reservoirs It is mainly stored in inorganic pores, while shale gas in shale is mainly stored in organic pores (organic pores) in the form of adsorption and dissociation. Therefore, for the content of organic pores in shale and pore structure (pore size distribution) Accurate evaluation is directly related to the evaluation of shale gas resources and the prediction of shale gas development sweet spot. [0003] Compared with the pores of conventional reservoirs, the pore size of organic pores in mud shale is very sma...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01N23/2251G01N23/2255
CPCG01N23/2251G01N23/2255G01N2223/072G01N2223/09G01N2223/102G01N2223/107G01N2223/401G01N2223/616G01N2223/649
Inventor郝进杨继进苏娇吴建国
OwnerINST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI