Device and method for measuring seismic wave velocity and electromagnetic attenuation in hydrate-bearing sedimentary medium

Abstract

The invention discloses a device for measuring a seismic wave speed and electromagnetic attenuation of hydrate-containing sedimentary media. The device comprises a reaction vessel. The reaction vessel comprises a base. An outer cylinder and an inner cylinder are arranged on the base. A top cover is arranged above the outer cylinder and the inner cylinder. The reaction vessel is arranged in a constant temperature box. Magnets are arranged at the outer side of the top cover. The magnets are wound by coils. The reaction vessel is further connected with a gas bottle. A rubber film is arranged at the outer side of the outer cylinder. A confining pressure is set at the outer side of the rubber film. A sample is arranged between the outer cylinder and the inner cylinder. A data collection device is arranged on the sample. The invention further discloses a method for measuring the seismic wave speed and electromagnetic attenuation of hydrate-containing sedimentary media. The device and the method can be used to measuring dynamic properties of hydrate samples.

Description

Technical field [0001] The invention belongs to the technical field of unconventional oil and gas reservoir development engineering, and specifically relates to a device for measuring the seismic wave velocity and electromagnetic attenuation of a hydrate deposition medium. The invention also relates to a method for measuring the seismic wave velocity and electromagnetic attenuation of a hydrate deposition medium. Background technique [0002] Natural gas hydrate is a kind of energy resource with great potential. It is widely distributed in oceans and permafrost all over the world. my country has also discovered hydrate in the seabed of the South China Sea and the tundra of Qilian Mountains. [0003] Seismic technology is an important means of hydrate geophysical exploration and resource evaluation. Although Bottom Simulating Reflector (BSR) is an important identification mark of hydrates, the existence of hydrates and BSR is not necessarily related to it. When identifying natural g...

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Problems solved by technology

Application No. 2012101604156 published the "Simulating Experimental Device for Acoustic Response Characteristics of Submarine Gas Migration and Hydrate Formation", and Application No. 2010102221015 published the "Device for Testing Acoustic Characteristics of Hydrate". However, the testing devices and methods have the following deficiencies: using The high-frequency acoustic testing technology is adopted, that is, the frequency used in the testing method is too high, there is a mismatch with the field seismic frequency, and the test results cannot be directly used in field applications; the inherent resonance frequency of the sample itself is not considered; the acoustic sensor and the The recombination of TDR (Time Domain Reflectometry) probes in the test space causes the test objects (spatial test range) of the acoustic sensor and TDR to be inconsistent

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