A Characterization Method for Shale Full Aperture Pore Volume

A technology of pore volume and pore size, which is applied in the fields of permeability/surface area analysis, suspension and porous material analysis, measuring devices, etc., to achieve an objective and reasonable effect of characterization

Active Publication Date: 2018-07-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] The present invention provides a characterization method of shale full-diameter pore volume, which is used to overcome the defects in the prior art of artificially dividing shale pore intervals and selecting experimental methods

Method used

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  • A Characterization Method for Shale Full Aperture Pore Volume
  • A Characterization Method for Shale Full Aperture Pore Volume
  • A Characterization Method for Shale Full Aperture Pore Volume

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Embodiment

[0042] In this embodiment, the shale full-pore pore volume characterization is performed on the shale in southeast Chongqing, including the following steps:

[0043] (1) Sample preparation: firstly, the shale is made into a cylinder with a diameter of 2.5 cm and a length of 3 cm using a coring drill bit and a core cutting device;

[0044] Take 10g of shale, crush it into a powder with a diameter of 0.18mm, and divide it into two parts to make the first powdery shale and the second powdery shale suitable for low-pressure nitrogen adsorption experiments and low-pressure carbon dioxide adsorption experiments.

[0045] (2) Sample pretreatment: the above three samples were placed in a 110°C incubator for 12 hours for dehydration treatment; -4 Under the condition of MPa, the degassing treatment is carried out, and the degassing time is 10 hours.

[0046] (3) Sample test: Three independent experiments were carried out on the pretreated samples, namely, high-pressure mercury intrusio...

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Abstract

The invention provides a characterizing method for pore volumes of full apertures of shale. The characterizing method comprises the following steps: (1) respectively dewatering and degassing a columnar shale, first powdered shale and second powdered shale in sequence; (2) analyzing the columnar shale by a high-pressure mercury intrusion method, and obtaining a pore volume of each aperture within a first aperture range according to a washburn equation; (3) analyzing the first powdered shale by a nitrogen adsorption method, and obtaining a pore volume of each aperture within a second aperture range according to a BJH model; (4) analyzing the second powdered shale by a carbon dioxide adsorption method, and obtaining a pore volume of each aperture within a third aperture range according to a DFT model; (5) obtaining a pore volume of each aperture within a superposition range by a weighted average method according to the superposition range among the first aperture range, the second aperture range and the third average range. According to the characterizing method, the full apertures of a shale pore structure are objectively and reasonably characterized, and the method is greatly significant for correctly evaluating a shale reservoir.

Description

technical field [0001] The invention relates to unconventional oil and gas exploration and development technology, in particular to a characterization method for shale full-diameter pore volume. Background technique [0002] Shale gas is a popular unconventional oil and gas resource today. Before the development of shale, in order to correctly evaluate the shale reservoir, it is necessary to quantitatively analyze and characterize the pore volume of different pore sizes developed in the shale reservoir, so as to provide key parameters for the study of shale gas occurrence state and flow , to avoid the economic loss of exploration and development or the loss of recoverable resources. [0003] Shale pores are several orders of magnitude smaller than conventional sandstone, and the International Union of Theoretical and Applied Chemistry (IUPAC) divides pores into micropores (<2.0nm), mesopores (2.0-50.0nm) and macropores (>50.0nm) according to the pore diameter. nm). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0893
Inventor 姜振学李卓唐相路李卫兵黄何鑫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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