Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for characterizing the pore structure of shale gas reservoirs and an evaluation method for shale gas reservoirs

A pore structure and shale gas technology, applied in the field of natural gas exploration, can solve the problems of different measurement ranges, inability to objectively characterize the pore structure characteristics, and impossible to fully characterize the micro-nano pore structure characteristics of shale reservoirs. The effect of characterizing results accurately

Active Publication Date: 2019-08-27
CHENGDU UNIVERSITY OF TECHNOLOGY
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the adsorption method and high-pressure mercury injection method are usually used to measure the micro-nano pore structure parameters of shale reservoirs, but the main problems in the measurement are: the measurement ranges of different methods are different, and neither the adsorption method nor the high-pressure mercury injection method is suitable. Possibility to comprehensively characterize the pore structure characteristics of micro-nanopores in shale reservoirs
For mesopores, due to the "throat expansion" effect under high-pressure injection conditions, the measured results cannot objectively characterize the pore structure characteristics below the mesopores

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for characterizing the pore structure of shale gas reservoirs and an evaluation method for shale gas reservoirs
  • A method for characterizing the pore structure of shale gas reservoirs and an evaluation method for shale gas reservoirs
  • A method for characterizing the pore structure of shale gas reservoirs and an evaluation method for shale gas reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] A group of mud shale samples collected at the same place were subjected to high-pressure mercury intrusion testing, and the first capillary pressure and the first pore throat radius rp were obtained 1 The relationship between. Determine the pore-throat radius that can be characterized by high-pressure mercury porosimetry. Carry out the adsorption method test on the same group of samples, the specific steps are as follows:

[0059] (1) Test the low-temperature nitrogen adsorption curve, and calculate the specific surface area and pore throat volume according to the BET equation.

[0060] Specific surface area S a The calculation formula is:

[0061] In the formula: S a is the specific surface area of ​​shale; V m is the saturated adsorption capacity of nitrogen monomolecule; W is the weight of shale.

[0062] The calculation formula of pore throat volume is V=Vp;

[0063] In the formula: V is the nitrogen adsorption capacity; V p is the pore throat volume.

[...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a characterization method of a pore structure of a shale gas reservoir and an evaluation method of the shale gas reservoir and relates to the technical field of natural gas exploration. The characterization method of the pore structure of the shale gas reservoir comprises the following steps: determining a pore diameter boundary of a pore throat radius capable of being characterized by an adsorption method and a high-pressure mercury intrusion method; splicing a pore structure which is measured by the adsorption method and is located below the pore diameter boundary with a pore structure which is measured by the high-pressure mercury intrusion method and is located above the pore diameter boundary, so as to obtain pore structure characteristics of a shale gas micro-reservoir. According to the method provided by the invention, the pore structure characteristics of a full-aperture section can be characterized and a characterization result is more accurate. The evaluation method of the shale gas reservoir comprises the following step of evaluating the shale gas reservoir by utilizing a result obtained by the characterization method of the pore structure of the shale gas reservoir. The pore structure characteristics of the full-aperture section are tested by the characterization method of the pore structure of the shale gas reservoir and the characterization result is more accurate and has an active effect on a gas reservoir storage capability of the shale gas reservoir.

Description

technical field [0001] The invention relates to the technical field of natural gas exploration, and in particular to a characterization method for the pore structure of a shale gas reservoir and an evaluation method for the shale gas reservoir. Background technique [0002] At present, the adsorption method and high-pressure mercury injection method are usually used to measure the micro-nano pore structure parameters of shale reservoirs, but the main problem in the measurement is that the measurement ranges of different methods are different, and neither the adsorption method nor the high-pressure mercury injection method is suitable. It is possible to fully characterize the pore structure characteristics of micro-nano pores in shale reservoirs. This is because the pore size of the smaller organic pores in shale oil and gas storage pores is mainly in the range of 10-200nm; ) range, the micropore information above 50nm cannot be obtained, and for the pores above the mesopore...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 周文徐浩周秋媚陈文玲曹茜
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com