Method for nuclear magnetic resonance on-line detection of shale gas

A technology of nuclear magnetic resonance and shale gas, which is applied in the direction of electron magnetic resonance/nuclear magnetic resonance detection and nuclear magnetic resonance analysis, etc., and can solve the problem that shale gas nuclear magnetic resonance signals cannot be detected
CN105181728AActive Publication Date: 2015-12-23PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2015-12-23

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Abstract

The invention provides a method for nuclear magnetic resonance on-line detection of shale gas. The method comprises steps: a shale sample is heated to a set temperature and pressurized to a set pressure by utilization of a high-temperature and high-pressure probe, the set temperature is 150-170 DEG C, and the set pressure is 50-60MPa; at the set temperature and the set pressure, the shale sample is subjected to nuclear magnetic resonance measurement by utilization of a pulse sequence, and the relaxation time T2 spectrum of the shale sample is obtained through inversion; the adsorbed gas saturability and the free gas saturability of the shale sample are calculated according to the relaxation time T2 spectrum. The detection method can evaluate occurrence of methane well and obtains the adsorbed gas saturability and the free gas saturability rapidly.
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Description

technical field

[0001] The invention relates to the field of petroleum exploration and development, in particular to a method for online detection of shale gas by nuclear magnetic resonance. Background technique

[0002] Shale gas is a kind of unconventional natural gas stored in shale or mudstone in free and adsorbed state. It is becoming a force to stir the world market and greatly rewrite the world's energy pattern.

[0003] At present, the method of analyzing the gas adsorbed by shale is mainly based on the isothermal adsorption experiment of coalbed methane. The method is to place the powdered shale sample in a sealed container, measure the volume of experimental gases such as methane adsorbed when it reaches adsorption equilibrium under the same temperature and different pressure conditions, and then calculate the Langmuir adsorption theory according to the Langmuir adsorption theory. Volume, Rankine pressure, and adsorption isotherms. This method is complex in opera...

Claims

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