Device and method for distinguishing matrix pores from microcracks of shale reservoir

A shale reservoir and micro-fracture technology, applied in the field of petrophysics, can solve the problem of accurately distinguishing matrix pores and micro-fractures

Active Publication Date: 2017-11-28
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no method that can accurately distin...

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  • Device and method for distinguishing matrix pores from microcracks of shale reservoir
  • Device and method for distinguishing matrix pores from microcracks of shale reservoir

Examples

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Embodiment 1

[0038] combine figure 1 As shown, in one embodiment of the present invention, a device for distinguishing shale reservoir matrix pores and micro-fractures includes an analysis control unit, a temperature control unit, an ion measurement unit and a liquid level control unit. The temperature control unit is used to control the constant temperature of the experiment process, including a thermostatic chamber 1 , a thermostatic bath 5 and a temperature sensor 10 arranged in the thermostatic chamber 1 . The ion measurement unit includes an airtight container that is located in the thermostatic tank 5 and contains the sample mixture, and a conductometer 3 that is located in the thermostatic chamber 1 and measures the conductivity of the sample mixture; the temperature sensor 10 is arranged in the airtight container. The liquid level control unit is arranged in the constant temperature tank 5, including the scale tube 2 connected to the lower end of the closed container, and the filte...

Embodiment 2

[0046] A method utilizing the device of embodiment 1 to distinguish shale reservoir matrix pores and micro-fractures, comprising the steps of:

[0047] 1) Pulverize the shale sample into particles, and then sieve the particles with a 6-mesh sieve to obtain sample particles with a particle size of 3350 μm;

[0048] 2) drying the sample particles at 105°C so that their quality does not change;

[0049] 3) Take 10g of dried sample particles and 200mL of distilled water and add them to a 250mL glass container respectively. The salt ions in the sample particles will be dispersed into the water to obtain a sample mixture; insert the lower end of the conductivity meter through the sealing cover into the sample for mixing liquid, and keep a distance of 4-6cm from the bottom of the glass container;

[0050] 4) Turn on the magnetic stirrer to stir for 2 minutes, then measure the initial conductivity of the sample mixture; after the stirring is completed, quickly measure the initial con...

Embodiment 3

[0053] The method for distinguishing matrix pores and microcracks in shale reservoirs is the same as in Example 2, and other steps remain unchanged, only step 1) is changed, such as:

[0054] 1) crush the shale sample into particles, and then sieve the particles with an 8-mesh sieve to obtain sample particles with a particle size of 2360 μm;

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Abstract

The invention discloses a device for distinguishing matrix pores from microcracks of a shale reservoir. The device comprises an analysis control unit, a temperature control unit, an ion measuring unit and a liquid level control unit. The invention also discloses a method for distinguishing the characteristics of the matrix pores from those of the microcracks by using the device. According to the device disclosed by the invention, evaporation capacity of liquid in a closed container and the influence of the temperature on ionic diffusion can be efficiently controlled by adopting the liquid level control unit and the temperature control unit; in addition, the change of electrical conductivity of shale particles with different particle sizes in a mixed solution is measured by the ion measuring unit in real time; by use of the device and the method disclosed by the invention, the characteristics of the matrix pores and the microcracks of the shale can be effectively evaluated according to the change of the measured electrical conductivity along with time. The invention provides a novel experimental testing technique and method for porous structure analysis of the shale reservoir, and has potential application value in the fields of evaluation of the shale reservoir, production prediction, postfrac evaluation and the like.

Description

technical field [0001] The invention belongs to the technical field of rock physics, and in particular relates to a device and a method for distinguishing matrix pores and micro-cracks of shale reservoirs. Background technique [0002] Shale gas is an unconventional oil and gas resource with huge reserves and cleanness, and has become one of my country's important strategic energy sources. Shale reservoirs have the characteristics of double pores and double media, and matrix pores and micro-fractures are developed at the same time. The pore structure is relatively complex, which brings difficulties to the evaluation of shale reservoirs. At the same time, the influence of matrix pores and micro-fractures on the occurrence and seepage of shale gas is obviously different, so it is necessary to study them separately. However, there is no method that can accurately distinguish the characteristics of matrix pores and microcracks. The salinity of the return fluid after shale gas ...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N15/08
Inventor 杨柳张旭辉鲁晓兵葛洪魁江昀
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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