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A method for quantitatively evaluating shale gas resources in shale and characterizing the transformation law of adsorbed gas and free gas

A shale gas and mud shale technology, applied in the field of quantitative evaluation of mud shale shale gas resources and characterization of the conversion law of adsorbed gas and free gas, can solve the problem that one-time fitting cannot be achieved, and the density of adsorbed phases is not given. Issues such as clarification of meaning or definition

Inactive Publication Date: 2019-09-06
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology

[0027] Although the above-mentioned models Langmuir model and SDR model have good fitting degree to methane supercritical adsorption data and can describe the principle of methane supercritical adsorption, they do not give a clear meaning or definition for the adsorption phase density, and the adsorption phase density in the formula is given by fixed value, which is contrary to the actual adsorption process
In addition, when Langmuir equation or DA equation is used to fit shale isothermal adsorption data, different temperatures need to be fitted separately, and one-time fitting cannot be achieved

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  • A method for quantitatively evaluating shale gas resources in shale and characterizing the transformation law of adsorbed gas and free gas
  • A method for quantitatively evaluating shale gas resources in shale and characterizing the transformation law of adsorbed gas and free gas
  • A method for quantitatively evaluating shale gas resources in shale and characterizing the transformation law of adsorbed gas and free gas

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Embodiment Construction

[0059] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0060] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0061] The present invention will be further described below in conjunction with the accompanying drawings, mainly divided into three parts for description, one is the establishment of the adsorption model, the other is the new model to calibrate the adsorption capacity of mud shale and obtain parameters, and the third is geological application.

[0062] 1. Model establishment

[0063] The essence of gas adsorption is that the density of the gas phase in the solid-gas system changes at the interface, which is the result of the minimization of the surface energy. The adsorption behavior is mainly described by the isotherm adsorption curve. According to the definition of Gibbs adsorption amount, the adsorption amount obtained in ...

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Abstract

The invention discloses a method for quantitative evaluation of shale gas resource quantity of shale and characterization of adsorption gas and free gas transformation rules. According to the method, influence of organic matter content, maturity, type, mineral composition and temperature and pressure conditions on shale gas absorption quantity can be analyzed, and on the basis of the influence, an adsorption model is established by combination of adsorption potential theory, supercritical adsorption experiment phenomena and computer simulation, and the core connotation is as follows: the adsorption quantity is equal to product of adsorption space and adsorption phase density, when adsorbate (shale) is determined, the adsorption space is the self attribute of the adsorbate, the adsorption space is irrelevant to the outside temperature and pressure conditions; and the adsorption phase density is a result of interaction of temperature and pressure and adsorbate pore structures.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating mud shale shale gas resources and characterizing the conversion law of adsorbed gas and free gas. Background technique [0002] Shale gas refers to natural gas that occurs in shale formations (dark mudstone and high-carbon mudstone dominate, and thin sand layers may be interbedded), which is a typical "in situ" accumulation (Zhang Jinchuan et al., 2001). There are various forms of shale gas occurrence. With the continuous deepening of mud shale research, people's understanding of the occurrence state of shale gas has gradually deepened. Curtis (2002) pointed out that the adsorption state plays a dominant role in the occurrence forms of shale gas. Status (accounting for 20% to 85% of shale gas volume). There are three main states of occurrence of shale gas: it occurs in the intergranular pores and natural fractures in the free state; it occurs in the surface of insoluble organic matter (ke...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/04
Inventor 张亚念李吉君卢双舫马妍黄开展
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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