Shale gas occurrence transformation and isotope response simulation device and method

Abstract

The invention discloses a shale gas occurrence transformation and isotope response simulation device. The device comprises a saturation-desorption tank, a chromatography-isotope mass spectrometry analysis system and a sample collecting and feeding mechanism; the saturation-desorption tank is used for performing gas high-pressure saturation on a rock core and performing desorption on the rock corewhich has been subjected to the high-pressure saturation; the chromatography-isotope mass spectrometry system is used for monitoring the changes of carbon isotopes or hydrogen isotopes in real time; and the sample collecting and feeding mechanism is used for collecting post-rock core desorption gas and feeding the post-rock core desorption gas into the chromatography-isotope mass spectrometry analysis system. The shale gas occurrence transformation and isotope response simulation device is used for a shale core gas high-pressure saturation-desorption experiment. With the shale gas occurrence transformation and isotope response simulation device adopted, the output process of shale gas in a laboratory can be simulated; the changes of carbon isotopes or hydrogen isotopes can be monitored inreal time; and basic data and theoretical support are provided for tracing the development state of a shale gas well and predicting productivity.

Description

technical field [0001] The invention relates to the technical field of oil and gas geological exploration, in particular to a shale gas occurrence transformation and isotope response simulation device and method. Background technique [0002] my country's shale gas production in the Jiaoshiba and Weiyuan blocks in the Sichuan Basin has reached 5.1×10 9 m 3 , is now at a critical stage of exploration and development, and issues such as the ratio of adsorbed gas / free gas during shale gas production, the development status of shale gas wells, and productivity prediction are all key concerns of oilfield units. The recent isotope method has gradually attracted attention, and has initially demonstrated the application potential for the above problems. In principle, in the process of adsorption / desorption and diffusion, there will be obvious methane isotope fractionation effect, which will cause isotope fractionation. It has been found that the carbon isotope value of methane in...

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Problems solved by technology

In principle, in the process of adsorption / desorption and diffusion, there will be obvious methane isotope fractionation effect, which will cause isotope fractionation

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